import { AlertCircle, ArrowLeft, CheckCircle2, ChevronDown, ChevronUp, ClipboardList, Copy, EyeOff, FolderKanban, MailCheck, MailPlus, Pencil, Play, Plus, RefreshCw, RotateCcw, Save, Send, Star, Trash2 } from "lucide-react";
import { type ClipboardEvent, FormEvent, useEffect, useMemo, useRef, useState } from "react";
import { toast } from "sonner";
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Accordion, AccordionContent, AccordionItem, AccordionTrigger } from "@/components/ui/accordion";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Checkbox } from "@/components/ui/checkbox";
import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { CopyTicketButton } from "@/components/CopyTicketButton";
import { HelpLink } from "@/components/HelpLink";
import { OrganizationSelect } from "@/components/OrganizationSelect";
import { readRichActivityEditorValue, RichActivityEditor } from "@/components/RichActivityEditor";
import { TodoPanel } from "@/components/TodoPanel";
import {
  acknowledgeProjectReview,
  createSession,
  deleteProject,
  deleteSession,
  hideProject,
  addFavoriteTicket,
  getDashboardPreference,
  getTicketDetails,
  getTicketPeriod,
  importTicketZammadMailSessions,
  previewTicketZammadMailSessions,
  removeFavoriteTicket,
  resendSessionZammadArticle,
  syncProjectTeamspaceSubentries,
  updateProjectTeamspaceSubentry,
  updateSessionBilling,
  updateSessionDetails,
  updateTicket,
  updateTicketDayBilling,
  updateProject,
  updateProjectStatus
} from "../api";
import type { CreateSessionResult, TicketZammadMailSessionItem, TicketZammadMailSessionResult } from "../api";
import { currentDay, currentMonth, formatDate, formatDateTime, formatMinutes, formatTimeRange } from "../format";
import { ticketHasRecurringBilling } from "../recurring-billings";
import type { AuthUser, BillingStatus, PeriodType, ProjectSummary, ProjectTeamspaceEntry, ProjectTeamspaceSubentry, SessionEntry, TicketDetailPeriodType, TicketPeriod, WorkType } from "../types";
import { ZammadPriorityBadge, ZammadStateBadge } from "../zammad-meta";
import { zammadArticleTypeFromValue, zammadArticleTypeLabel, zammadArticleTypeOptions, zammadArticleTypeValue, type ZammadArticleTypeId } from "../zammad-article-types";
import { getLocalStorageValue, setLocalStorageValue } from "@/lib/local-storage.client";
import { cn } from "@/lib/utils";

type TicketDetailPageProps = {
  periodType: TicketDetailPeriodType;
  period: string;
  ticketId: string;
  onNavigate: (to: string) => void;
  onStartTimer: (ticketNumber: string) => Promise<boolean>;
  currentUser: AuthUser;
  onOpenTicketChange?: (ticket: {
    key: string;
    ticketId: string;
    ticketNumber: string;
    periodType: TicketDetailPeriodType;
    period: string;
    path: string;
    returnPath?: string;
    dirty: boolean;
  }) => void;
  returnPath: string;
};

type TicketSessionFormState = {
  organizationId: string;
  organizationName: string | null;
  projectTeamspaceEntryId: string;
  activity: string;
  zammadArticleBody: string;
  billingStatus: BillingStatus;
  createZammadArticle: boolean;
  zammadArticleTypeId: ZammadArticleTypeId;
  workType: WorkType;
  day: string;
  startTime: string;
  endTime: string;
};

type ProjectEditFormState = {
  title: string;
  organizationId: string;
  organizationName: string | null;
  description: string;
  startsOn: string;
  endsOn: string;
  teamspaceEntries: ProjectTeamspaceEntryForm[];
};

type ProjectTeamspaceEntryForm = {
  clientId: string;
  teamspaceProject: string;
  teamspaceDescription: string;
  hourBudget: string;
  budgetSyncDisabled: boolean;
  manualConsumption: string;
  isDefault: boolean;
};

type TeamspaceSubentryEditDraft = {
  alias: string;
};

function emptyTicketSessionForm(): TicketSessionFormState {
  return {
    organizationId: "",
    organizationName: null,
    projectTeamspaceEntryId: "",
    activity: "",
    zammadArticleBody: "",
    billingStatus: null,
    createZammadArticle: false,
    zammadArticleTypeId: 6,
    workType: "support",
    day: currentDay(),
    startTime: "09:00",
    endTime: "09:30"
  };
}

function notifyZammadArticleResult(result: CreateSessionResult) {
  if (result.zammadArticle?.status === "sent") {
    toast.success("Zammad-Notiz übertragen");
    return;
  }

  if (result.zammadArticle?.status === "failed") {
    toast.error("Zammad-Notiz nicht übertragen", {
      description: result.zammadArticle.error ?? "Die Session wurde gespeichert, aber Zammad hat die Notiz nicht angenommen."
    });
  }
}

function notifyTodosChanged() {
  window.dispatchEvent(new Event("tickettracker:todos-changed"));
}

function zammadSyncStorageKey(userId: string) {
  return `tickettracker.zammad-sync.${userId}`;
}

function teamspaceSubentryAccordionStorageKey(userId: string, projectId: string) {
  return `tickettracker.teamspace-subentry-accordion.${userId}.${projectId}`;
}

function parseStoredTeamspaceSubentryGroups(value: string | null, validIds: Set<string>) {
  if (!value) {
    return null;
  }

  try {
    const parsed = JSON.parse(value);

    if (!Array.isArray(parsed)) {
      return null;
    }

    return Array.from(new Set(parsed.filter((id): id is string => typeof id === "string" && validIds.has(id))));
  } catch {
    return null;
  }
}

function parseMailDaysBack(value: unknown) {
  const parsed = Number(value);
  return Number.isInteger(parsed) && parsed >= 1 && parsed <= 3650 ? parsed : 30;
}

function mailDaysBackFromZammadSyncSettings(userId: string) {
  const raw = getLocalStorageValue(zammadSyncStorageKey(userId));

  if (!raw) {
    return 30;
  }

  try {
    const parsed = JSON.parse(raw) as { mailDaysBack?: unknown };
    return parseMailDaysBack(parsed.mailDaysBack);
  } catch {
    return 30;
  }
}

function projectEntryId() {
  if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
    return crypto.randomUUID();
  }

  return `entry-${Date.now()}-${Math.random().toString(16).slice(2)}`;
}

function escapeHtml(value: string) {
  return value
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;");
}

function textToEditorHtml(value: string) {
  return value
    .split(/\r?\n/)
    .map((line) => `<div>${line ? escapeHtml(line) : "<br>"}</div>`)
    .join("");
}

function fileToDataUrl(file: File) {
  return new Promise<string>((resolve, reject) => {
    const reader = new FileReader();
    reader.addEventListener("load", () => resolve(String(reader.result ?? "")));
    reader.addEventListener("error", () => reject(reader.error ?? new Error("Bild konnte nicht gelesen werden")));
    reader.readAsDataURL(file);
  });
}

function insertEditorHtml(html: string) {
  document.execCommand("insertHTML", false, html);
}

function currentSelectionRange() {
  const selection = window.getSelection();
  return selection && selection.rangeCount > 0 ? selection.getRangeAt(0).cloneRange() : null;
}

function restoreSelectionRange(range: Range | null) {
  if (!range) {
    return;
  }

  const selection = window.getSelection();
  selection?.removeAllRanges();
  selection?.addRange(range);
}

function editorPlainText(element: HTMLElement) {
  return element.innerText.replace(/\u00a0/g, " ").trim();
}

function hasInlineImage(element: HTMLElement) {
  return Boolean(element.querySelector("img[src^='data:image/']"));
}

function normalizedEditorHtml(element: HTMLElement) {
  const html = element.innerHTML.trim();
  return html && (editorPlainText(element) || hasInlineImage(element)) ? html : "";
}

function projectTeamspaceEntries(project: ProjectSummary): ProjectTeamspaceEntry[] {
  if (project.teamspace_entries?.length) {
    return project.teamspace_entries;
  }

  return [
    {
      id: `${project.id}-default`,
      teamspace_project: project.teamspace_project,
      teamspace_description: "",
      is_default: true,
      hour_budget_minutes: project.hour_budget_minutes,
      manual_consumption_minutes: project.manual_consumption_minutes ?? 0,
      teamspace_consumption_minutes: project.teamspace_consumption_minutes ?? 0,
      consumption_minutes: project.consumption_minutes ?? project.teamspace_consumption_minutes ?? 0,
      display_order: 0
    }
  ];
}

function budgetedProjectTeamspaceEntries(project: ProjectSummary) {
  return projectTeamspaceEntries(project).filter((entry) => Number(entry.hour_budget_minutes ?? 0) > 0);
}

function teamspaceEntryDisplayLabel(entry: { teamspace_project: string | null; teamspace_description?: string | null; is_default: boolean }) {
  return entry.teamspace_description?.trim() || entry.teamspace_project || "Ohne Teamspace-ID";
}

function teamspaceEntryOptionLabel(entry: { teamspace_project: string | null; teamspace_description?: string | null; is_default: boolean }) {
  const label = teamspaceEntryDisplayLabel(entry);

  return entry.is_default ? `${label} (Standard)` : label;
}

function teamspaceEntryDescription(entry: { teamspace_project?: string | null; teamspace_description?: string | null } | null | undefined) {
  return entry?.teamspace_description?.trim() ? entry.teamspace_project?.trim() || "" : "";
}

function teamspaceSubentryOptionLabel(subentry: ProjectTeamspaceSubentry) {
  return subentry.alias?.trim() || subentry.name?.trim() || subentry.teamspace_project_id || `Position ${subentry.display_order + 1}`;
}

function teamspacePositionDisplayId(value: string | null | undefined) {
  if (!value) {
    return "";
  }

  return value
    .split(".")
    .map((part) => (/^\d+$/.test(part) ? String(Number(part)) : part))
    .join(".");
}

function teamspaceSubentryDescription(subentry: ProjectTeamspaceSubentry | null | undefined) {
  return subentry?.description?.trim() || "";
}

function decodeHtmlEntities(value: string) {
  const namedEntities: Record<string, string> = {
    amp: "&",
    gt: ">",
    lt: "<",
    quot: "\"",
    apos: "'",
    nbsp: " ",
    auml: "ä",
    Auml: "Ä",
    ouml: "ö",
    Ouml: "Ö",
    uuml: "ü",
    Uuml: "Ü",
    szlig: "ß",
    euro: "€"
  };

  return value.replace(/&(#x[0-9a-f]+|#\d+|[a-z][a-z0-9]+);/gi, (match, entity: string) => {
    if (entity.startsWith("#x")) {
      const codePoint = Number.parseInt(entity.slice(2), 16);
      return Number.isFinite(codePoint) ? String.fromCodePoint(codePoint) : match;
    }

    if (entity.startsWith("#")) {
      const codePoint = Number.parseInt(entity.slice(1), 10);
      return Number.isFinite(codePoint) ? String.fromCodePoint(codePoint) : match;
    }

    return namedEntities[entity] ?? match;
  });
}

function teamspaceFormattedText(value: string | null | undefined) {
  if (!value) {
    return "";
  }

  return decodeHtmlEntities(
    value
      .replace(/<\s*br\s*\/?\s*>/gi, "\n")
      .replace(/<\/\s*(p|div|li|ul|ol)\s*>/gi, "\n")
      .replace(/<[^>]*>/g, "")
  )
    .replace(/\u00a0/g, " ")
    .replace(/[ \t]+\n/g, "\n")
    .replace(/\n{3,}/g, "\n\n")
    .trim();
}

function teamspaceProgressClass(progress: number | null | undefined) {
  const value = Number(progress ?? 0);

  if (value >= 100) {
    return "border-emerald-500/30 bg-emerald-500/10 text-emerald-700 dark:text-emerald-300";
  }

  if (value >= 75) {
    return "border-amber-500/30 bg-amber-500/10 text-amber-700 dark:text-amber-300";
  }

  return "border-muted-foreground/20 bg-muted/40 text-muted-foreground";
}

function teamspaceBillableUsagePercent(sumMinutes: number | null | undefined, plannedMinutes: number | null | undefined) {
  const planned = Number(plannedMinutes ?? 0);

  if (!Number.isFinite(planned) || planned <= 0) {
    return null;
  }

  const used = Number(sumMinutes ?? 0);
  return Math.round((used / planned) * 100);
}

function teamspaceFixedUnitCount(subentry: ProjectTeamspaceSubentry, kind: "sum" | "planned") {
  return kind === "sum"
    ? Number(subentry.sum_minutes_billable ?? subentry.sum_minutes ?? 0)
    : Number(subentry.planned_minutes_billable ?? subentry.planned_minutes ?? 0);
}

function teamspaceIncomeValue(value: number | string | null | undefined) {
  const number = Number(value ?? 0);
  return Number.isFinite(number) ? number : 0;
}

function isTeamspaceFixedPricePosition(billingType: string | null | undefined) {
  return billingType === "INVOICEABLE_FIX";
}

function teamspaceFixedPriceFulfilled(subentry: ProjectTeamspaceSubentry) {
  const planned = teamspaceIncomeValue(subentry.planned_income);
  const used = teamspaceIncomeValue(subentry.sum_income);

  return planned > 0 && used >= planned;
}

function teamspaceBillingKey(day: string, projectTeamspaceEntryId: string | null | undefined) {
  return `${projectTeamspaceEntryId ?? "ticket"}::${day}`;
}

function dayBillingProjectEntryIdForView(
  projectTeamspaceEntryId: string | null | undefined,
  hasMultipleProjectTeamspaceEntries: boolean,
  defaultProjectEntryId: string | null
) {
  if (!hasMultipleProjectTeamspaceEntries) {
    return null;
  }

  return projectTeamspaceEntryId ?? defaultProjectEntryId;
}

function projectEditForm(project: ProjectSummary): ProjectEditFormState {
  const entries = projectTeamspaceEntries(project).map((entry, index) => ({
    clientId: entry.id || projectEntryId(),
    teamspaceProject: entry.teamspace_project ?? "",
    teamspaceDescription: entry.teamspace_description ?? "",
    hourBudget: formatHoursInput(entry.hour_budget_minutes),
    budgetSyncDisabled: entry.budget_sync_disabled ?? false,
    manualConsumption: formatHoursInput(entry.manual_consumption_minutes),
    isDefault: entry.is_default || index === 0
  }));
  const hasDefault = entries.some((entry) => entry.isDefault);

  return {
    title: project.title ?? "",
    organizationId: project.organization_id ?? "",
    organizationName: project.organization_name ?? project.customer_name ?? null,
    description: combinedProjectDescription(project),
    startsOn: project.starts_on ?? "",
    endsOn: project.ends_on ?? "",
    teamspaceEntries: hasDefault ? entries : entries.map((entry, index) => ({ ...entry, isDefault: index === 0 }))
  };
}

function teamspaceSubentryEditDrafts(project: ProjectSummary | null | undefined) {
  const drafts: Record<string, TeamspaceSubentryEditDraft> = {};

  for (const entry of project ? projectTeamspaceEntries(project) : []) {
    for (const subentry of entry.subentries ?? []) {
      drafts[subentry.id] = {
        alias: subentry.alias ?? ""
      };
    }
  }

  return drafts;
}

function combinedProjectDescription(project: ProjectSummary) {
  return [project.description, project.goals].map((part) => part.trim()).filter(Boolean).join("\n\n");
}

function InlineImageActivityEditor({
  id,
  value,
  htmlValue,
  onChange
}: {
  id: string;
  value: string;
  htmlValue: string;
  onChange: (value: string, htmlValue: string) => void;
}) {
  const editorRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const editor = editorRef.current;

    if (!editor) {
      return;
    }

    const nextHtml = htmlValue || (value ? textToEditorHtml(value) : "");

    if (editor.innerHTML !== nextHtml) {
      editor.innerHTML = nextHtml;
    }
  }, [htmlValue, value]);

  function emitChange() {
    const editor = editorRef.current;

    if (!editor) {
      return;
    }

    onChange(editorPlainText(editor), normalizedEditorHtml(editor));
  }

  async function handlePaste(event: ClipboardEvent<HTMLDivElement>) {
    const imageFiles = Array.from(event.clipboardData.items)
      .filter((item) => item.kind === "file" && item.type.startsWith("image/"))
      .map((item) => item.getAsFile())
      .filter((file): file is File => Boolean(file));

    if (imageFiles.length === 0) {
      const text = event.clipboardData.getData("text/plain");

      if (text) {
        event.preventDefault();
        document.execCommand("insertText", false, text);
        emitChange();
      }

      return;
    }

    event.preventDefault();

    let insertionRange = currentSelectionRange();
    const text = event.clipboardData.getData("text/plain").trim();
    if (text) {
      document.execCommand("insertText", false, `${text}\n`);
      insertionRange = currentSelectionRange();
    }

    try {
      for (const file of imageFiles) {
        const dataUrl = await fileToDataUrl(file);
        restoreSelectionRange(insertionRange);
        insertEditorHtml(`<img src="${dataUrl}" style="display:block;max-width:100%;height:auto;margin-top:0.5rem;border-radius:0.375rem;"><br>`);
        insertionRange = currentSelectionRange();
      }
      emitChange();
    } catch (error) {
      toast.error("Screenshot konnte nicht eingefügt werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    }
  }

  return (
    <div
      id={id}
      ref={editorRef}
      role="textbox"
      aria-multiline="true"
      contentEditable
      suppressContentEditableWarning
      className="min-h-24 w-full overflow-hidden rounded-lg border border-input bg-transparent px-2.5 py-2 text-base outline-none transition-colors empty:before:text-muted-foreground empty:before:content-[attr(data-placeholder)] focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 md:text-sm [&_img]:my-2 [&_img]:max-h-[28rem] [&_img]:max-w-full [&_img]:rounded-md"
      data-placeholder="Tätigkeit beschreiben, Screenshot mit Strg+V einfügen"
      onInput={emitChange}
      onBlur={emitChange}
      onPaste={(event) => void handlePaste(event)}
    />
  );
}

function BillingButtons({
  session,
  disabled,
  loading,
  onChange
}: {
  session: SessionEntry;
  disabled: boolean;
  loading: boolean;
  onChange: (status: BillingStatus) => void;
}) {
  const status = session.billing_status;

  return (
    <div className="grid grid-cols-3 gap-2 sm:inline-grid lg:gap-3">
      <Button
        type="button"
        size="sm"
        variant={status === "billable" ? "default" : "secondary"}
        disabled={loading || (disabled && status !== "billable")}
        onClick={() => onChange(status === "billable" ? null : "billable")}
        className={cn("h-8", status === "billable" ? "" : "bg-secondary/70")}
      >
        Abrechenbar
      </Button>
      <Button
        type="button"
        size="sm"
        variant={status === "billed" ? "default" : "secondary"}
        disabled={loading || (disabled && status !== "billed")}
        onClick={() => onChange(status === "billed" ? null : "billed")}
        className={cn("h-8", status === "billed" ? "" : "bg-secondary/70")}
      >
        Abgerechnet
      </Button>
      <Button
        type="button"
        size="sm"
        variant={status === "non_billable" ? "default" : "secondary"}
        disabled={loading || (disabled && status !== "non_billable")}
        onClick={() => onChange(status === "non_billable" ? null : "non_billable")}
        className={cn("h-8", status === "non_billable" ? "" : "bg-secondary/70")}
      >
        Nicht abrechenbar
      </Button>
    </div>
  );
}

function BillingCaptureSelect({
  id,
  value,
  onChange
}: {
  id: string;
  value: BillingStatus;
  onChange: (status: BillingStatus) => void;
}) {
  return (
    <select
      id={id}
      className="h-9 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
      value={value ?? ""}
      onChange={(event) => onChange(event.currentTarget.value === "" ? null : event.currentTarget.value as Exclude<BillingStatus, null>)}
    >
      <option value="">---</option>
      <option value="billable">Abrechenbar</option>
      <option value="non_billable">Nicht abrechenbar</option>
    </select>
  );
}

function sessionDayKey(value: string) {
  const date = new Date(value);
  return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, "0")}-${String(date.getDate()).padStart(2, "0")}`;
}

async function writeTextToClipboard(value: string) {
  if (typeof navigator !== "undefined" && navigator.clipboard?.writeText) {
    await navigator.clipboard.writeText(value);
    return;
  }

  if (typeof document === "undefined") {
    throw new Error("Zwischenablage nicht verfügbar");
  }

  const textarea = document.createElement("textarea");
  textarea.value = value;
  textarea.style.position = "fixed";
  textarea.style.left = "-9999px";
  textarea.setAttribute("readonly", "");
  document.body.appendChild(textarea);
  textarea.focus();
  textarea.select();

  try {
    if (!document.execCommand("copy")) {
      throw new Error("Zwischenablage nicht verfügbar");
    }
  } finally {
    document.body.removeChild(textarea);
  }
}

function teamspacePreparationText(ticket: TicketPeriod["ticket"] | null | undefined, sessions: SessionEntry[]) {
  const ticketNumber = ticket?.ticket_number ?? "Ticket#-";
  const customerName = ticket?.organization_name ?? ticket?.customer_name ?? "-";
  const activities = sessions
    .slice()
    .sort((left, right) => new Date(left.started_at).getTime() - new Date(right.started_at).getTime())
    .map((session) => session.activity.trim())
    .filter(Boolean)
    .join("\n");

  return [`${ticketNumber} - ${customerName}`, "", activities, "", "Tickethandling und Dokumentation"].join("\n");
}

function SessionActivityBody({ session }: { session: SessionEntry }) {
  if (session.zammad_article_body) {
    return (
      <div
        className="break-words text-sm font-medium [&_blockquote]:border-l-2 [&_blockquote]:pl-3 [&_br]:block [&_code]:rounded-sm [&_code]:bg-muted [&_code]:px-1 [&_h1]:text-xl [&_h1]:font-semibold [&_h2]:text-lg [&_h2]:font-semibold [&_h3]:text-base [&_h3]:font-semibold [&_img]:my-2 [&_img]:max-h-80 [&_img]:max-w-full [&_img]:rounded-md [&_ol]:ml-5 [&_ol]:list-decimal [&_p]:my-1 [&_pre]:whitespace-pre-wrap [&_pre]:rounded-md [&_pre]:bg-muted [&_pre]:p-2 [&_strike]:line-through [&_ul]:ml-5 [&_ul]:list-disc"
        dangerouslySetInnerHTML={{ __html: session.zammad_article_body }}
      />
    );
  }

  return <p className="whitespace-pre-wrap break-words text-sm font-medium">{session.activity || "Keine Tätigkeit erfasst."}</p>;
}

function toDateLocalValue(value: string) {
  const date = new Date(value);
  const offsetMs = date.getTimezoneOffset() * 60_000;
  return new Date(date.getTime() - offsetMs).toISOString().slice(0, 10);
}

function toTimeLocalValue(value: string) {
  const date = new Date(value);
  const offsetMs = date.getTimezoneOffset() * 60_000;
  return new Date(date.getTime() - offsetMs).toISOString().slice(11, 16);
}

function formatHoursInput(minutes?: number | null) {
  if (minutes === null || minutes === undefined) {
    return "";
  }

  return new Intl.NumberFormat("de-DE", { maximumFractionDigits: 2 }).format(minutes / 60);
}

function parseHoursInput(value: string) {
  const trimmed = value.trim();

  if (!trimmed) {
    return null;
  }

  if (/[,.]$/.test(trimmed)) {
    return undefined;
  }

  const hours = Number(trimmed.replace(",", "."));

  if (!Number.isFinite(hours) || hours < 0) {
    return undefined;
  }

  return Math.round(hours * 60);
}

function projectConsumptionBarClass(percent: number) {
  if (percent >= 100) {
    return "bg-blue-500";
  }

  if (percent >= 90) {
    return "bg-red-500";
  }

  return "bg-emerald-500";
}

function projectConsumptionPercent(consumptionMinutes: number, budgetMinutes?: number | null) {
  if (!budgetMinutes || budgetMinutes <= 0) {
    return null;
  }

  return Math.round((consumptionMinutes / budgetMinutes) * 100);
}

function projectRemainingLabel(remainingMinutes: number | null) {
  if (remainingMinutes === null) {
    return "Rest offen";
  }

  if (remainingMinutes < 0) {
    return `Überzogen ${formatMinutes(Math.abs(remainingMinutes))}`;
  }

  return `Rest ${formatMinutes(remainingMinutes)}`;
}

function isPartialHoursInput(value: string) {
  return /^\d*(?:[,.]\d*)?$/.test(value.trim());
}

function normalizeProjectTeamspaceEntryForms(entries: ProjectTeamspaceEntryForm[]) {
  const source = entries.length
    ? entries
    : [
      {
        clientId: projectEntryId(),
        teamspaceProject: "",
        teamspaceDescription: "",
        hourBudget: "",
        budgetSyncDisabled: false,
        manualConsumption: "",
        isDefault: true
      }
    ];
  const defaultIndex = Math.max(0, source.findIndex((entry) => entry.isDefault));

  return source.map((entry, index) => ({
    ...entry,
    isDefault: index === defaultIndex
  }));
}

function parseProjectTeamspaceEntryForms(entries: ProjectTeamspaceEntryForm[]) {
  const normalizedEntries = normalizeProjectTeamspaceEntryForms(entries);
  const parsedEntries = normalizedEntries.map((entry) => {
    const manualConsumptionMinutes = parseHoursInput(entry.manualConsumption);

    if (manualConsumptionMinutes === undefined) {
      return undefined;
    }

    return {
      id: /^\d+$/.test(entry.clientId) ? entry.clientId : null,
      teamspaceProject: entry.teamspaceProject.trim() || null,
      teamspaceDescription: entry.teamspaceDescription.trim() || null,
      isDefault: entry.isDefault,
      hourBudgetMinutes: null,
      budgetSyncDisabled: false,
      manualConsumptionMinutes: manualConsumptionMinutes ?? 0
    };
  });

  if (parsedEntries.some((entry) => entry === undefined)) {
    return undefined;
  }

  return parsedEntries as Array<{
    id?: string | null;
    teamspaceProject: string | null;
    teamspaceDescription: string | null;
    isDefault: boolean;
    hourBudgetMinutes: number | null;
    budgetSyncDisabled: boolean;
    manualConsumptionMinutes: number;
  }>;
}

function ProjectTeamspaceEntriesEditor({
  entries,
  onChange,
  showManualConsumption = true
}: {
  entries: ProjectTeamspaceEntryForm[];
  onChange: (entries: ProjectTeamspaceEntryForm[]) => void;
  showManualConsumption?: boolean;
}) {
  const normalizedEntries = normalizeProjectTeamspaceEntryForms(entries);

  function updateEntry(clientId: string, changes: Partial<ProjectTeamspaceEntryForm>) {
    onChange(normalizeProjectTeamspaceEntryForms(normalizedEntries.map((entry) => (entry.clientId === clientId ? { ...entry, ...changes } : entry))));
  }

  function removeEntry(clientId: string) {
    onChange(normalizeProjectTeamspaceEntryForms(normalizedEntries.filter((entry) => entry.clientId !== clientId)));
  }

  return (
    <div className="space-y-2">
      <div className="flex items-center justify-between gap-2">
        <label className="text-sm font-medium">Teamspace-Einträge</label>
        <Button type="button" size="sm" variant="secondary" onClick={() => onChange([...normalizedEntries, { clientId: projectEntryId(), teamspaceProject: "", teamspaceDescription: "", hourBudget: "", budgetSyncDisabled: false, manualConsumption: "", isDefault: false }])}>
          <Plus className="size-3.5" />
          Eintrag
        </Button>
      </div>
      {normalizedEntries.map((entry, index) => (
        <div
          key={entry.clientId}
          className={cn(
            "grid gap-2 rounded-lg border bg-muted/10 p-3 sm:items-end",
            showManualConsumption
              ? "sm:grid-cols-[minmax(180px,1fr)_minmax(160px,1fr)_110px_120px_36px]"
              : "sm:grid-cols-[minmax(180px,1fr)_minmax(160px,1fr)_120px_36px]"
          )}
        >
          <div className="space-y-1.5">
            <label className="text-xs font-medium text-muted-foreground" htmlFor={`project-ticket-teamspace-${entry.clientId}`}>
              Teamspace-Projekt {entry.isDefault ? "(Standard)" : ""}
            </label>
            <Input
              id={`project-ticket-teamspace-${entry.clientId}`}
              value={entry.teamspaceProject}
              onChange={(event) => updateEntry(entry.clientId, { teamspaceProject: event.currentTarget.value })}
            />
          </div>
          <div className="space-y-1.5">
            <label className="text-xs font-medium text-muted-foreground" htmlFor={`project-ticket-teamspace-description-${entry.clientId}`}>Info</label>
            <Input
              id={`project-ticket-teamspace-description-${entry.clientId}`}
              value={entry.teamspaceDescription}
              placeholder="z.B. Cloud-Umzug"
              onChange={(event) => updateEntry(entry.clientId, { teamspaceDescription: event.currentTarget.value })}
            />
          </div>
          {showManualConsumption ? (
            <div className="space-y-1.5">
              <label className="text-xs font-medium text-muted-foreground" htmlFor={`project-ticket-teamspace-manual-${entry.clientId}`}>Manuell h</label>
              <Input
                id={`project-ticket-teamspace-manual-${entry.clientId}`}
                inputMode="decimal"
                value={entry.manualConsumption}
                onChange={(event) => updateEntry(entry.clientId, { manualConsumption: event.currentTarget.value })}
              />
            </div>
          ) : null}
          <Button
            type="button"
            size="sm"
            variant={entry.isDefault ? "default" : "secondary"}
            className="sm:self-end"
            onClick={() => onChange(normalizedEntries.map((candidate) => ({ ...candidate, isDefault: candidate.clientId === entry.clientId })))}
          >
            {entry.isDefault ? "Standard" : "Als Standard"}
          </Button>
          <Button type="button" size="icon" variant="ghost" className="sm:self-end sm:justify-self-end" disabled={normalizedEntries.length === 1} onClick={() => removeEntry(entry.clientId)}>
            <Trash2 className="size-4 text-destructive" />
            <span className="sr-only">Teamspace-Eintrag {index + 1} löschen</span>
          </Button>
        </div>
      ))}
    </div>
  );
}

export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onStartTimer, currentUser, onOpenTicketChange, returnPath }: TicketDetailPageProps) {
  const initialGlobalMonthFilter = periodType === "all" && period !== "all" ? period : currentMonth();
  const [data, setData] = useState<TicketPeriod | null>(null);
  const [loadingId, setLoadingId] = useState<string | null>(null);
  const [deletingId, setDeletingId] = useState<string | null>(null);
  const [savingTicket, setSavingTicket] = useState(false);
  const [savingFavorite, setSavingFavorite] = useState(false);
  const [isFavorite, setIsFavorite] = useState(false);
  const [editTicketNumber, setEditTicketNumber] = useState("");
  const [editTicketTitle, setEditTicketTitle] = useState("");
  const [editOrganizationId, setEditOrganizationId] = useState("");
  const [editOrganizationName, setEditOrganizationName] = useState<string | null>(null);
  const [editWorkType, setEditWorkType] = useState<WorkType>("support");
  const [editingSession, setEditingSession] = useState<SessionEntry | null>(null);
  const [pendingProjectDelete, setPendingProjectDelete] = useState<{ projectId: string } | null>(null);
  const [editSessionOrganizationId, setEditSessionOrganizationId] = useState("");
  const [editSessionOrganizationName, setEditSessionOrganizationName] = useState<string | null>(null);
  const [editSessionActivity, setEditSessionActivity] = useState("");
  const [editSessionZammadArticleBody, setEditSessionZammadArticleBody] = useState("");
  const [editSessionWorkType, setEditSessionWorkType] = useState<WorkType>("support");
  const [editSessionProjectTeamspaceEntryId, setEditSessionProjectTeamspaceEntryId] = useState("");
  const [editSessionDay, setEditSessionDay] = useState("");
  const [editSessionStartTime, setEditSessionStartTime] = useState("");
  const [editSessionEndTime, setEditSessionEndTime] = useState("");
  const [savingSessionDetails, setSavingSessionDetails] = useState(false);
  const [sendingZammadSessionId, setSendingZammadSessionId] = useState<string | null>(null);
  const [dayBillingInputs, setDayBillingInputs] = useState<Record<string, string>>({});
  const [savingDayBillingKey, setSavingDayBillingKey] = useState<string | null>(null);
  const [selectedTeamspaceEntryId, setSelectedTeamspaceEntryId] = useState<string | null>(null);
  const [ticketSession, setTicketSession] = useState<TicketSessionFormState>(() => emptyTicketSessionForm());
  const [savingTicketSession, setSavingTicketSession] = useState(false);
  const [globalMonthFilter, setGlobalMonthFilter] = useState(initialGlobalMonthFilter);
  const [globalStatusFilter, setGlobalStatusFilter] = useState<"all" | "open" | "billable" | "billed" | "non_billable">("all");
  const [globalSourceFilter, setGlobalSourceFilter] = useState<"all" | "manual" | "recurring">("all");
  const [editingProject, setEditingProject] = useState(false);
  const [savingProject, setSavingProject] = useState(false);
  const [deletingEmptyProject, setDeletingEmptyProject] = useState(false);
  const [savingProjectStatus, setSavingProjectStatus] = useState(false);
  const [syncingTeamspaceSubentries, setSyncingTeamspaceSubentries] = useState(false);
  const [editingTeamspaceSubentries, setEditingTeamspaceSubentries] = useState(false);
  const [openTeamspaceSubentryGroups, setOpenTeamspaceSubentryGroups] = useState<string[]>([]);
  const [teamspaceSubentryDrafts, setTeamspaceSubentryDrafts] = useState<Record<string, TeamspaceSubentryEditDraft>>({});
  const [savingTeamspaceSubentryId, setSavingTeamspaceSubentryId] = useState<string | null>(null);
  const [projectForm, setProjectForm] = useState<ProjectEditFormState>({
    title: "",
    organizationId: "",
    organizationName: null,
    description: "",
    startsOn: "",
    endsOn: "",
    teamspaceEntries: [
      {
        clientId: projectEntryId(),
        teamspaceProject: "",
        teamspaceDescription: "",
        hourBudget: "",
        budgetSyncDisabled: false,
        manualConsumption: "",
        isDefault: true
      }
    ]
  });
  const [todoFilter, setTodoFilter] = useState<"open" | "all" | "done">("open");
  const [expandedSessionIds, setExpandedSessionIds] = useState<string[]>([]);
  const [projectDescriptionExpanded, setProjectDescriptionExpanded] = useState(false);
  const [teamspacePreparation, setTeamspacePreparation] = useState<{ day: string; label: string; text: string } | null>(null);
  const [mailPreview, setMailPreview] = useState<TicketZammadMailSessionResult | null>(null);
  const [mailSelection, setMailSelection] = useState<Record<number, boolean>>({});
  const [loadingMailPreview, setLoadingMailPreview] = useState(false);
  const [importingMailSessions, setImportingMailSessions] = useState(false);
  const [mailImportOpen, setMailImportOpen] = useState(false);

  async function load() {
    try {
      setData(
        periodType === "all"
          ? await getTicketDetails(ticketId, {
              month: globalMonthFilter,
              status: globalStatusFilter,
              source: globalSourceFilter
            })
          : await getTicketPeriod(periodType, period, ticketId)
      );
    } catch (error) {
      toast.error("Ticket konnte nicht geladen werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    }
  }

  useEffect(() => {
    void load();
  }, [periodType, period, ticketId, globalMonthFilter, globalStatusFilter, globalSourceFilter]);

  useEffect(() => {
    if (periodType !== "all") {
      return;
    }

    setGlobalMonthFilter(period !== "all" ? period : currentMonth());
  }, [periodType, period, ticketId]);

  useEffect(() => {
    const loadedProjectEntries = data?.project ? projectTeamspaceEntries(data.project) : [];
	    const hasMultipleEntries = loadedProjectEntries.length > 1;
	    const defaultEntryId = loadedProjectEntries.find((entry) => entry.is_default)?.id ?? null;
	    const nextInputMinutes = new Map<string, number>();

	    for (const billing of data?.dayBillings ?? []) {
	      const key = teamspaceBillingKey(
	        billing.day,
	        dayBillingProjectEntryIdForView(billing.project_teamspace_entry_id, hasMultipleEntries, defaultEntryId)
	      );
	      nextInputMinutes.set(key, (nextInputMinutes.get(key) ?? 0) + Number(billing.billed_minutes ?? 0));
	    }

	    const nextInputs = Object.fromEntries(
	      Array.from(nextInputMinutes.entries()).map(([key, minutes]) => [key, formatHoursInput(minutes)])
	    );
	    setDayBillingInputs(nextInputs);
  }, [data?.dayBillings, data?.project]);

  useEffect(() => {
    if (!data?.ticket) {
      return;
    }

    setEditTicketNumber(data.ticket.ticket_number);
    setEditTicketTitle(data.ticket.title ?? "");
    setEditOrganizationId(data.ticket.organization_id ?? "");
    setEditOrganizationName(data.ticket.organization_name ?? null);
    setEditWorkType(data.ticket.work_type ?? "support");
    const loadedProjectEntries = data.project ? projectTeamspaceEntries(data.project) : [];
    setTicketSession((current) => ({
      ...current,
      organizationId: data.ticket.organization_id ?? current.organizationId,
      organizationName: data.ticket.organization_name ?? current.organizationName,
      projectTeamspaceEntryId: loadedProjectEntries.length === 1 ? loadedProjectEntries[0].id : current.projectTeamspaceEntryId,
      workType: data.ticket.work_type ?? current.workType
    }));
  }, [data?.ticket, data?.project]);

  useEffect(() => {
    setTeamspaceSubentryDrafts(teamspaceSubentryEditDrafts(data?.project));
  }, [data?.project]);

  useEffect(() => {
    setTicketSession((current) => {
      if (
        current.activity ||
        current.billingStatus ||
        (current.createZammadArticle === currentUser.zammad_session_note_default_enabled && current.zammadArticleTypeId === currentUser.zammad_article_type_id)
      ) {
        return current;
      }

      return {
        ...current,
        createZammadArticle: currentUser.zammad_session_note_default_enabled,
        zammadArticleTypeId: currentUser.zammad_article_type_id
      };
    });
  }, [currentUser.zammad_article_type_id, currentUser.zammad_session_note_default_enabled]);

  useEffect(() => {
    setProjectDescriptionExpanded(false);
  }, [data?.project?.id]);

  useEffect(() => {
    setMailPreview(null);
    setMailSelection({});
  }, [ticketId]);

  const ticket = data?.ticket;
  const project = data?.project ?? null;
  const isRecurringBillingTicket = ticketHasRecurringBilling(ticket);
  const projectDescription = project ? combinedProjectDescription(project) : "";
  const projectEntries = useMemo(() => (project ? projectTeamspaceEntries(project) : []), [project]);
  const budgetedProjectEntries = useMemo(() => (project ? budgetedProjectTeamspaceEntries(project) : []), [project]);
  const projectTeamspaceSubentryGroups = useMemo(
    () => projectEntries
      .map((entry) => ({
        entry,
        subentries: entry.subentries ?? []
      }))
      .filter((group) => group.subentries.length > 0),
    [projectEntries]
  );
  const projectTeamspaceSubentryCount = projectTeamspaceSubentryGroups.reduce((sum, group) => sum + group.subentries.length, 0);
  const teamspaceSubentryGroupIds = useMemo(() => projectTeamspaceSubentryGroups.map((group) => group.entry.id), [projectTeamspaceSubentryGroups]);
  const teamspaceSubentryAccordionKey = project ? teamspaceSubentryAccordionStorageKey(currentUser.id, project.id) : null;
  useEffect(() => {
    const validIds = new Set(teamspaceSubentryGroupIds);

    setOpenTeamspaceSubentryGroups((current) => {
      const stored = parseStoredTeamspaceSubentryGroups(
        teamspaceSubentryAccordionKey ? getLocalStorageValue(teamspaceSubentryAccordionKey) : null,
        validIds
      );

      if (stored) {
        return stored;
      }

      return current.filter((id) => validIds.has(id));
    });
  }, [teamspaceSubentryAccordionKey, teamspaceSubentryGroupIds]);

  function updateOpenTeamspaceSubentryGroups(nextOpenGroups: string[]) {
    const validIds = new Set(teamspaceSubentryGroupIds);
    const next = Array.from(new Set(nextOpenGroups.filter((id) => validIds.has(id))));

    setOpenTeamspaceSubentryGroups(next);

    if (teamspaceSubentryAccordionKey) {
      setLocalStorageValue(teamspaceSubentryAccordionKey, JSON.stringify(next));
    }
  }

  const hasMultipleProjectTeamspaceEntries = projectEntries.length > 1;
  const hasProjectTeamspaceApiIds = projectEntries.some((entry) => Boolean(entry.teamspace_api_project_id));
	  const showTeamspaceSubentryCard = Boolean(project && hasProjectTeamspaceApiIds);
	  const usesTeamspaceSubentries = false;
	  const showBudgetedProjectEntries = budgetedProjectEntries.length > 1;
	  const requiresProjectTeamspaceEntry = Boolean(project && hasMultipleProjectTeamspaceEntries);
  const teamspaceTimeTrackingEnabled = currentUser.teamspace_time_tracking_enabled ?? true;
  const projectConsumptionMinutes = project?.consumption_minutes ?? 0;
  const projectBudgetMinutes = project?.hour_budget_minutes ?? null;
  const projectConsumptionUsagePercent = project ? projectConsumptionPercent(projectConsumptionMinutes, projectBudgetMinutes) : null;
  const projectRemainingMinutes = projectBudgetMinutes && projectBudgetMinutes > 0 ? projectBudgetMinutes - projectConsumptionMinutes : null;
  const canEditProject = project?.can_edit === true;
  const unassignedTeamspaceEntryCount = teamspaceTimeTrackingEnabled ? Number(project?.unassigned_teamspace_session_count ?? 0) : 0;
	  const unassignedTeamspaceSubentryCount = 0;
  const ticketManagedByZammad = Boolean(ticket?.zammad_ticket_id);
  const canEditTicketData = ticket?.can_edit_ticket_data === true;
  const zammadOwnerLabel = ticket?.zammad_owner_display_name
    || ticket?.zammad_owner_username
    || (ticket?.zammad_owner_id ? `Zammad-Owner ${ticket.zammad_owner_id}` : null);
  const projectOwnerLabel = project?.owner_display_name
    || project?.owner_username
    || (project?.zammad_owner_id ? `Zammad-Owner ${project.zammad_owner_id}` : null)
    || zammadOwnerLabel;
  const currentZammadUserLabel = currentUser.zammad_user_id ? `Zammad-User ${currentUser.zammad_user_id}` : "dein Zammad-User";
  const isProject = Boolean(project);
  const isGlobalTicket = periodType === "all";
  const isPeriodClosed = Boolean(data?.closed);
  const mailDaysBack = useMemo(() => mailDaysBackFromZammadSyncSettings(currentUser.id), [currentUser.id]);
  const selectedMailArticleIds = useMemo(
    () => (mailPreview?.items ?? []).filter((item) => mailSelection[item.articleId] !== false).map((item) => item.articleId),
    [mailPreview?.items, mailSelection]
  );
  const allMailSelected = Boolean(mailPreview?.items.length) && selectedMailArticleIds.length === mailPreview?.items.length;
  const canPreviewMailSessions = Boolean(ticket?.work_type && currentUser.has_zammad_api_token && currentUser.zammad_user_id);
  const periodLabel = periodType === "month" ? "Monat" : periodType === "day" ? "Tag" : "Ticket";
  const sessionsScopeLabel = isGlobalTicket
    ? globalMonthFilter === "all"
      ? "im gesamten Ticketverlauf"
      : `im Monat ${globalMonthFilter}`
    : `im ${periodLabel.toLowerCase()} ${period}`;
  const teamspaceLabel = isGlobalTicket || periodType === "month" ? "Teamspace gesamt" : "Teamspace Tag";
  const availableMonths = data?.availableMonths ?? [];
  const selectedMonthHasSessions = availableMonths.some((month) => month.month === globalMonthFilter);
  const defaultProjectEntryId = projectEntries.find((entry) => entry.is_default)?.id ?? null;
	  const dayBillingMap = useMemo(() => {
		    const billingMap = new Map<string, number>();

		    for (const billing of data?.dayBillings ?? []) {
		      const key = teamspaceBillingKey(
		        billing.day,
		        dayBillingProjectEntryIdForView(billing.project_teamspace_entry_id, requiresProjectTeamspaceEntry, defaultProjectEntryId)
		      );
		      billingMap.set(key, (billingMap.get(key) ?? 0) + Number(billing.billed_minutes ?? 0));
		    }

		    return billingMap;
		  }, [data?.dayBillings, defaultProjectEntryId, requiresProjectTeamspaceEntry]);
	  const savedDayBillingInput = (key: string) => formatHoursInput(dayBillingMap.get(key));
  const isDayBillingDirty = (key: string) => (dayBillingInputs[key] ?? "") !== savedDayBillingInput(key);
	  const unassignedTeamspaceSessions = useMemo(
	    () => teamspaceTimeTrackingEnabled
        ? (data?.sessions ?? []).filter((session) =>
            session.work_type === "consulting"
            && (session.billing_status === "billable" || session.billing_status === "billed")
            && !session.project_teamspace_entry_id
          )
        : [],
	    [data?.sessions, teamspaceTimeTrackingEnabled]
	  );
	  const usesTeamspaceEntryTabs = Boolean(project && hasMultipleProjectTeamspaceEntries && (requiresProjectTeamspaceEntry || usesTeamspaceSubentries));
	  const teamspaceTabs = useMemo(() => {
	    if (!usesTeamspaceEntryTabs) {
	      return [];
	    }

    return [
      ...projectEntries.map((entry) => ({
        id: entry.id,
        label: teamspaceEntryDisplayLabel(entry),
        description: teamspaceEntryDescription(entry),
        entry
      })),
      ...(unassignedTeamspaceSessions.length > 0
        ? [{ id: "unassigned", label: "Ohne Zuordnung", description: "", entry: null }]
        : [])
    ];
	  }, [projectEntries, unassignedTeamspaceSessions.length, usesTeamspaceEntryTabs]);
	  const activeTeamspaceEntryId = usesTeamspaceEntryTabs
	    ? selectedTeamspaceEntryId && teamspaceTabs.some((tab) => tab.id === selectedTeamspaceEntryId)
	      ? selectedTeamspaceEntryId
	      : teamspaceTabs[0]?.id ?? null
	    : null;
  const selectedTicketSessionTeamspaceEntry = projectEntries.find((entry) => entry.id === ticketSession.projectTeamspaceEntryId) ?? null;
  const selectedEditSessionTeamspaceEntry = projectEntries.find((entry) => entry.id === editSessionProjectTeamspaceEntryId) ?? null;
	  const projectEntryConsumptionById = useMemo(() => {
	    const consumption = new Map<string, number>();

	    for (const entry of projectEntries) {
	      consumption.set(entry.id, Number(entry.consumption_minutes ?? 0));
	    }

	    return consumption;
	  }, [projectEntries]);
  const sessionGroups = useMemo(() => {
    const groups = new Map<
      string,
      {
        key: string;
        day: string;
        projectTeamspaceEntryId: string | null;
        label: string;
        totalMinutes: number;
        billableMinutes: number;
        nonBillableMinutes: number;
        openMinutes: number;
        sessions: SessionEntry[];
      }
	    >();
	
	    for (const session of data?.sessions ?? []) {
	      if (usesTeamspaceEntryTabs) {
	        if (activeTeamspaceEntryId === "unassigned") {
	          if (session.project_teamspace_entry_id) {
	            continue;
	          }
	        } else if (session.project_teamspace_entry_id !== activeTeamspaceEntryId) {
          continue;
        }
      }
	
	      const day = sessionDayKey(session.started_at);
	      const projectTeamspaceEntryId =
	        activeTeamspaceEntryId && activeTeamspaceEntryId !== "unassigned"
	          ? activeTeamspaceEntryId
	          : usesTeamspaceSubentries && projectEntries.length === 1
	            ? projectEntries[0].id
	            : null;
	      const key = teamspaceBillingKey(day, projectTeamspaceEntryId);
      const group = groups.get(key);
      const billedMinutes = session.billing_status === "billed" ? session.rounded_minutes : 0;
      const billableMinutes = session.billing_status === "billable" ? session.rounded_minutes : 0;
      const nonBillableMinutes = session.billing_status === "non_billable" ? session.rounded_minutes : 0;
      const openMinutes = session.billing_status === null || session.billing_status === "billable" ? session.rounded_minutes : 0;

      if (group) {
        group.sessions.push(session);
        group.totalMinutes += billedMinutes;
        group.billableMinutes += billableMinutes;
        group.nonBillableMinutes += nonBillableMinutes;
        group.openMinutes += openMinutes;
        continue;
      }

      groups.set(key, {
        key,
        day,
        projectTeamspaceEntryId,
        label: formatDate(session.started_at),
        totalMinutes: billedMinutes,
        billableMinutes,
        nonBillableMinutes,
        openMinutes,
        sessions: [session]
      });
    }

    return Array.from(groups.values())
      .map((group) => ({
        ...group,
        sessions: [...group.sessions].sort((left, right) => new Date(right.started_at).getTime() - new Date(left.started_at).getTime())
      }))
      .sort((left, right) => right.key.localeCompare(left.key));
	  }, [activeTeamspaceEntryId, data?.sessions, projectEntries, usesTeamspaceEntryTabs, usesTeamspaceSubentries]);
	  const sessionIds = useMemo(() => sessionGroups.flatMap((group) => group.sessions.map((session) => session.id)), [sessionGroups]);
	  const allSessionsExpanded = sessionIds.length > 0 && sessionIds.every((sessionId) => expandedSessionIds.includes(sessionId));
	  const periodTotalMinutes = sessionGroups.reduce((sum, group) => sum + group.totalMinutes, 0);
			  const periodTeamspaceMinutes = (data?.dayBillings ?? []).reduce((sum, billing) => sum + Number(billing.billed_minutes ?? 0), 0);
  const ticketDataDirty = Boolean(
    ticket &&
      canEditTicketData &&
      (editTicketNumber !== ticket.ticket_number ||
        editTicketTitle !== (ticket.title ?? "") ||
        editOrganizationId !== (ticket.organization_id ?? "") ||
        editWorkType !== (ticket.work_type ?? "support"))
  );
  const todos = data?.todos ?? [];
  const visibleTodos = todoFilter === "all" ? todos : todos.filter((todo) => todo.status === todoFilter);
  const todoCounts = {
    open: todos.filter((todo) => todo.status === "open").length,
    done: todos.filter((todo) => todo.status === "done").length,
    all: todos.length
  };
  const hasUnsavedChanges = ticketDataDirty || (teamspaceTimeTrackingEnabled && sessionGroups.some((group) => isDayBillingDirty(group.key)));

  useEffect(() => {
    setExpandedSessionIds((current) => current.filter((sessionId) => sessionIds.includes(sessionId)));
  }, [sessionIds]);

  useEffect(() => {
    if (!ticket) {
      return;
    }

    const ticketMonth = isGlobalTicket ? globalMonthFilter : periodType === "day" ? period.slice(0, 7) : period;

    onOpenTicketChange?.({
      key: `ticket:${ticket.id}`,
      ticketId: ticket.id,
      ticketNumber: ticket.ticket_number,
      periodType: "all",
      period: ticketMonth,
      path: `/tickets/${ticket.id}?month=${ticketMonth}`,
      returnPath,
      dirty: hasUnsavedChanges
    });
  }, [ticket, periodType, period, isGlobalTicket, globalMonthFilter, returnPath, hasUnsavedChanges, onOpenTicketChange]);

  useEffect(() => {
    let cancelled = false;

    if (!ticket?.ticket_number) {
      setIsFavorite(false);
      return;
    }

    async function loadFavoriteStatus() {
      try {
        const result = await getDashboardPreference();
        const favorites = Array.isArray(result.preference.favorites) ? result.preference.favorites : [];

        if (!cancelled) {
          setIsFavorite(favorites.some((favorite) => favorite.ticketNumber === ticket?.ticket_number));
        }
      } catch {
        if (!cancelled) {
          setIsFavorite(false);
        }
      }
    }

    void loadFavoriteStatus();

    return () => {
      cancelled = true;
    };
  }, [ticket?.ticket_number]);

  async function setBilling(sessionId: string, billingStatus: BillingStatus) {
    if (isPeriodClosed && billingStatus !== null) {
      toast.warning("Monat ist abgeschlossen", {
        description: "Öffne den Monat zuerst wieder, um Bewertungen zu ändern."
      });
      return;
    }

    setLoadingId(sessionId);
    try {
      await updateSessionBilling(sessionId, billingStatus);
      await load();
    } catch (error) {
      toast.error("Status konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setLoadingId(null);
    }
  }

  async function sendSessionToZammad(session: SessionEntry) {
    if (!session.activity.trim() && !session.zammad_article_body) {
      toast.warning("Keine Zammad-Notiz möglich", {
        description: "Die Session hat keine Tätigkeit."
      });
      return;
    }

    setSendingZammadSessionId(session.id);
    try {
      const result = await resendSessionZammadArticle(session.id, {
        zammadArticleTypeId: session.zammad_article_type_id ?? currentUser.zammad_article_type_id
      });
      notifyZammadArticleResult(result);
      await load();
    } catch (error) {
      toast.error("Zammad-Notiz konnte nicht gesendet werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSendingZammadSessionId(null);
    }
  }

  async function previewTicketMailSessions() {
    if (!ticket) {
      return;
    }

    if (!canPreviewMailSessions) {
      toast.warning("Mail-Sync nicht bereit", {
        description: "Dieses Ticket braucht eine Zammad-Ticket-ID und dein Profil einen gültigen Zammad-Token."
      });
      return;
    }

    setLoadingMailPreview(true);
    try {
      const result = await previewTicketZammadMailSessions(ticket.id, mailDaysBack);
      setMailPreview(result);
      setMailSelection(Object.fromEntries(result.items.map((item) => [item.articleId, true])));
      toast.success("Mail-Vorschau erstellt", {
        description: `${result.items.length} Mail-Session(s) können importiert werden.`
      });
    } catch (error) {
      toast.error("Mail-Vorschau fehlgeschlagen", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setLoadingMailPreview(false);
    }
  }

  async function importTicketMailSessions() {
    if (!ticket || selectedMailArticleIds.length === 0) {
      toast.info("Keine Mail-Sessions ausgewählt");
      return;
    }

    setImportingMailSessions(true);
    try {
      const result = await importTicketZammadMailSessions(ticket.id, mailDaysBack, selectedMailArticleIds);
      setMailPreview(null);
      setMailSelection({});
      setMailImportOpen(false);
      const firstError = result.errors[0];
      const description = firstError
        ? `${result.created} angelegt, ${result.skipped} ohne Transfer. Article ${firstError.articleId}: ${firstError.error}`
        : `${result.created} angelegt, ${result.skipped} ohne Transfer.`;
      const notify = result.created === 0 && result.errors.length > 0 ? toast.error : toast.success;
      notify("Mail-Sessions importiert", { description });
      if (result.created > 0) {
        notifyTodosChanged();
      }
      await load();
    } catch (error) {
      toast.error("Mail-Sessions konnten nicht importiert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setImportingMailSessions(false);
    }
  }

  function toggleMailSelection(articleId: number, checked: boolean) {
    setMailSelection((current) => ({ ...current, [articleId]: checked }));
  }

  function toggleAllMailSelection(checked: boolean) {
    setMailSelection(Object.fromEntries((mailPreview?.items ?? []).map((item) => [item.articleId, checked])));
  }

  function toggleSessionDetails(sessionId: string) {
    setExpandedSessionIds((current) =>
      current.includes(sessionId) ? current.filter((id) => id !== sessionId) : [...current, sessionId]
    );
  }

  function toggleAllSessionDetails() {
    setExpandedSessionIds(allSessionsExpanded ? [] : sessionIds);
  }

	  async function saveDayBilling(group: (typeof sessionGroups)[number]) {
	    if (!ticket) {
	      return;
	    }

    if (isPeriodClosed) {
      toast.warning("Monat ist abgeschlossen", {
        description: "Öffne den Monat zuerst wieder, um Teamspace-Zeiten zu ändern."
      });
      return;
    }

    const parsedMinutes = parseHoursInput(dayBillingInputs[group.key] ?? "");

    if (parsedMinutes === undefined) {
      toast.error("Teamspace-Zeit prüfen", {
        description: "Bitte Stunden als positive Zahl eintragen, z.B. 1,5."
      });
      return;
    }

    const currentMinutes = dayBillingMap.get(group.key) ?? null;

    if (parsedMinutes === currentMinutes) {
      return;
    }

    setSavingDayBillingKey(group.key);
    try {
      await updateTicketDayBilling(ticket.id, group.day, parsedMinutes, group.projectTeamspaceEntryId);
      toast.success("Zeit gespeichert");
      await load();
    } catch (error) {
      toast.error("Zeit konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
	      setSavingDayBillingKey(null);
	    }
	  }

  async function saveTicketData(event: FormEvent) {
    event.preventDefault();

    if (!ticket) {
      return;
    }

    if (!canEditTicketData) {
      toast.error(ticketManagedByZammad ? "Ticketdaten kommen aus Zammad" : "Ticket gehört einem anderen Owner", {
        description: ticketManagedByZammad
          ? "Nummer, Art, Titel und Organisation werden durch den Zammad-Sync verwaltet."
          : "Nur der Owner kann Ticketdaten ändern."
      });
      return;
    }

    if (!editOrganizationId) {
      toast.error("Organisation wählen");
      return;
    }

    const removeProjectData = Boolean(project && editWorkType === "support");

    if (removeProjectData) {
      const confirmed = window.confirm(
        `Ticket "${ticket.title || ticket.ticket_number}" auf Support umstellen? Projektdaten, Kontingent und Teamspace-Zeiten werden entfernt. Sessions und ToDos bleiben erhalten.`
      );

      if (!confirmed) {
        return;
      }
    }

    setSavingTicket(true);
    try {
      await updateTicket(ticket.id, {
        ticketNumber: editTicketNumber,
        title: editTicketTitle || null,
        organizationId: editOrganizationId,
        workType: editWorkType,
        removeProjectData
      });
      toast.success("Ticketdaten gespeichert", {
        description: editWorkType === "consulting" ? "Das Ticket ist jetzt als Projekt angelegt." : "Organisation und Art wurden auf die vorhandenen Sessions übernommen."
      });
      await load();
    } catch (error) {
      toast.error("Ticketdaten konnten nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingTicket(false);
    }
  }

  function openProjectEditor() {
    if (!project) {
      return;
    }

    if (!canEditProject) {
      toast.error("Projekt ist geteilt", {
        description: "Nur der Zammad-Owner kann die Projektdaten bearbeiten."
      });
      return;
    }

    setProjectForm(projectEditForm(project));
    setEditingProject(true);
  }

  async function saveProjectData(event: FormEvent) {
    event.preventDefault();

    if (!project || !ticket) {
      return;
    }

    if (!canEditProject) {
      toast.error("Projekt ist geteilt", {
        description: "Nur der Zammad-Owner kann die Projektdaten bearbeiten."
      });
      return;
    }

    if (!projectForm.organizationId) {
      toast.error("Organisation wählen");
      return;
    }

    const teamspaceEntries = parseProjectTeamspaceEntryForms(projectForm.teamspaceEntries);

    if (!teamspaceEntries) {
      toast.error("Teamspace-Einträge prüfen", {
        description: "Bitte Stunden als Zahl eintragen, z.B. 12,5."
      });
      return;
    }

    const defaultTeamspaceEntry = teamspaceEntries.find((entry) => entry.isDefault) ?? teamspaceEntries[0];

    setSavingProject(true);
    try {
      await updateProject(project.id, {
        ticketNumber: ticket.ticket_number,
        title: projectForm.title || null,
        organizationId: projectForm.organizationId,
        teamspaceProject: defaultTeamspaceEntry.teamspaceProject,
        teamspaceEntries,
        description: projectForm.description,
        goals: "",
        startsOn: projectForm.startsOn || null,
        endsOn: projectForm.endsOn || null,
        hourBudgetMinutes: defaultTeamspaceEntry.hourBudgetMinutes,
        manualConsumptionMinutes: defaultTeamspaceEntry.manualConsumptionMinutes
      });
      toast.success("Projekt gespeichert");
      setEditingProject(false);
      await load();
    } catch (error) {
      toast.error("Projekt konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingProject(false);
    }
  }

  async function setProjectClosed(closed: boolean) {
    if (!project) {
      return;
    }

    if (!canEditProject) {
      toast.error("Projekt ist geteilt", {
        description: "Nur der Zammad-Owner kann den Projektstatus ändern."
      });
      return;
    }

    setSavingProjectStatus(true);
    try {
      await updateProjectStatus(project.id, closed);
      toast.success(closed ? "Projekt geschlossen" : "Projekt wieder geöffnet");
      await load();
    } catch (error) {
      toast.error("Projektstatus konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingProjectStatus(false);
    }
  }

  async function syncTeamspaceSubentries() {
    if (!project || syncingTeamspaceSubentries) {
      return;
    }

    setSyncingTeamspaceSubentries(true);

    try {
      const { result } = await syncProjectTeamspaceSubentries(project.id);
      toast.success("Teamspace-Unterpositionen synchronisiert", {
        description: `${result.subentriesSynced} Position(en) abgeglichen, ${result.subentriesRemoved} entfernt.`
      });
      await load();
    } catch (error) {
      toast.error("Teamspace-Unterpositionen konnten nicht synchronisiert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSyncingTeamspaceSubentries(false);
    }
  }

  async function saveTeamspaceSubentry(subentry: ProjectTeamspaceSubentry) {
    const draft = teamspaceSubentryDrafts[subentry.id];

    if (!draft) {
      return;
    }

    if (!canEditProject) {
      toast.error("Projekt ist geteilt", {
        description: "Nur der Zammad-Owner kann Teamspace-Unterpositionen bearbeiten."
      });
      return;
    }

    setSavingTeamspaceSubentryId(subentry.id);

    try {
      await updateProjectTeamspaceSubentry(subentry.id, {
        alias: draft.alias
      });
      toast.success("Teamspace-Unterposition gespeichert");
      await load();
    } catch (error) {
      toast.error("Teamspace-Unterposition konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingTeamspaceSubentryId(null);
    }
  }

  async function acknowledgeProjectReviewCheck() {
    if (!project) {
      return;
    }

    if (!canEditProject) {
      toast.error("Projekt ist geteilt", {
        description: "Nur der Zammad-Owner kann die Prüfung bestätigen."
      });
      return;
    }

    setSavingProjectStatus(true);
    try {
      await acknowledgeProjectReview(project.id);
      toast.success("Prüfung bestätigt");
      await load();
    } catch (error) {
      toast.error("Prüfung konnte nicht bestätigt werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingProjectStatus(false);
    }
  }

  async function submitTicketSession(event: FormEvent) {
    event.preventDefault();

    if (!ticket) {
      return;
    }

    if (isRecurringBillingTicket) {
      toast.error("Fixe Abrechnung", {
        description: "Für fixe Abrechnungen dürfen keine Sessions nachgetragen werden. Bitte die Definition bearbeiten."
      });
      return;
    }

    const effectiveOrganizationId = ticket.organization_id ?? ticketSession.organizationId;
    const effectiveWorkType = ticket.work_type ?? ticketSession.workType;

    if (!effectiveOrganizationId) {
      toast.error("Organisation wählen");
      return;
    }

    if (!ticketSession.activity.trim() && !ticketSession.zammadArticleBody) {
      toast.error("Tätigkeit erfassen");
      return;
    }

    if (effectiveWorkType === "consulting" && requiresProjectTeamspaceEntry && !ticketSession.projectTeamspaceEntryId) {
      toast.error("Teamspace-Eintrag wählen", {
        description: "Dieses Projekt hat mehrere Teamspace-Einträge."
      });
      return;
    }

    const startedAt = new Date(`${ticketSession.day}T${ticketSession.startTime}:00`);
    const endedAt = new Date(`${ticketSession.day}T${ticketSession.endTime}:00`);

    if (Number.isNaN(startedAt.getTime()) || Number.isNaN(endedAt.getTime())) {
      toast.error("Datum oder Uhrzeit prüfen");
      return;
    }

    if (endedAt < startedAt) {
      toast.error("Ende darf nicht vor Beginn liegen");
      return;
    }

    const durationSeconds = Math.floor((endedAt.getTime() - startedAt.getTime()) / 1000);

    setSavingTicketSession(true);

    try {
      const activityValue = readRichActivityEditorValue("ticket-session-activity") ?? {
        activity: ticketSession.activity,
        zammadArticleBody: ticketSession.zammadArticleBody
      };
      const result = await createSession({
        ticketNumber: ticket.ticket_number,
        organizationId: effectiveOrganizationId,
        activity: activityValue.activity,
        zammadArticleBody: activityValue.zammadArticleBody || null,
        workType: effectiveWorkType,
        startedAt: startedAt.toISOString(),
        endedAt: endedAt.toISOString(),
        durationSeconds,
        projectTeamspaceEntryId: effectiveWorkType === "consulting" && requiresProjectTeamspaceEntry ? ticketSession.projectTeamspaceEntryId : null,
        billingStatus: ticketSession.billingStatus,
        createZammadArticle: ticketSession.createZammadArticle && (activityValue.activity.trim().length > 0 || Boolean(activityValue.zammadArticleBody)),
        zammadArticleTypeId: ticketSession.zammadArticleTypeId
      });
      toast.success("Session nachgetragen", {
        description: "Der Eintrag wurde diesem Ticket zugeordnet. Betroffene Abschlüsse wurden wieder geöffnet."
      });
      notifyZammadArticleResult(result);
      notifyTodosChanged();
      setTicketSession({
        ...emptyTicketSessionForm(),
        organizationId: ticket.organization_id ?? "",
        organizationName: ticket.organization_name ?? null,
        projectTeamspaceEntryId: "",
        zammadArticleBody: "",
        workType: ticket.work_type ?? "support",
        day: ticketSession.day,
        billingStatus: null,
        createZammadArticle: currentUser.zammad_session_note_default_enabled,
        zammadArticleTypeId: currentUser.zammad_article_type_id
      });
      await load();
    } catch (error) {
      toast.error("Session konnte nicht nachgetragen werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingTicketSession(false);
    }
  }

  function openSessionEditor(session: SessionEntry) {
    setEditingSession(session);
    setEditSessionOrganizationId(session.organization_id ?? "");
    setEditSessionOrganizationName(session.organization_name ?? null);
    setEditSessionActivity(session.activity);
    setEditSessionZammadArticleBody(session.zammad_article_body ?? "");
    setEditSessionWorkType(session.work_type);
    setEditSessionProjectTeamspaceEntryId(session.project_teamspace_entry_id ?? "");
    setEditSessionDay(toDateLocalValue(session.started_at));
    setEditSessionStartTime(toTimeLocalValue(session.started_at));
    setEditSessionEndTime(toTimeLocalValue(session.ended_at));
  }

  function openTeamspacePreparation(group: (typeof sessionGroups)[number]) {
    setTeamspacePreparation({
      day: group.key,
      label: group.label,
      text: teamspacePreparationText(ticket, group.sessions)
    });
  }

  async function copyTeamspacePreparation() {
    if (!teamspacePreparation) {
      return;
    }

    try {
      await writeTextToClipboard(teamspacePreparation.text);
      toast.success("TS Aufbereitung kopiert", {
        description: teamspacePreparation.label
      });
    } catch (error) {
      toast.error("TS Aufbereitung konnte nicht kopiert werden", {
        description: error instanceof Error ? error.message : "Zwischenablage nicht verfügbar"
      });
    }
  }

  async function saveSessionData(event: FormEvent) {
    event.preventDefault();

    if (!editingSession) {
      return;
    }

    if (!editSessionOrganizationId) {
      toast.error("Organisation wählen");
      return;
    }

    const startedAt = new Date(`${editSessionDay}T${editSessionStartTime}:00`);
    const endedAt = new Date(`${editSessionDay}T${editSessionEndTime}:00`);

    if (Number.isNaN(startedAt.getTime()) || Number.isNaN(endedAt.getTime())) {
      toast.error("Beginn und Ende prüfen");
      return;
    }

    if (endedAt < startedAt) {
      toast.error("Ende darf nicht vor Beginn liegen");
      return;
    }

    if (editSessionWorkType === "consulting" && requiresProjectTeamspaceEntry && !editSessionProjectTeamspaceEntryId) {
      toast.error("Teamspace-Eintrag wählen", {
        description: "Dieses Projekt hat mehrere Teamspace-Einträge."
      });
      return;
    }

    const removeProjectData = Boolean(project && editingSession.work_type === "consulting" && editSessionWorkType === "support");

    if (removeProjectData) {
      const confirmed = window.confirm(
        `Session auf Support umstellen? Falls dadurch keine Consulting-Sessions mehr für "${ticket?.title || ticket?.ticket_number || "dieses Ticket"}" bleiben, werden Projektdaten, Kontingent und Teamspace-Zeiten entfernt. Sessions und ToDos bleiben erhalten.`
      );

      if (!confirmed) {
        return;
      }
    }

    setSavingSessionDetails(true);
    try {
      const activityValue = readRichActivityEditorValue("session-activity") ?? {
        activity: editSessionActivity,
        zammadArticleBody: editSessionZammadArticleBody
      };
      await updateSessionDetails(editingSession.id, {
        organizationId: editSessionOrganizationId,
        activity: activityValue.activity,
        zammadArticleBody: activityValue.zammadArticleBody || null,
        workType: editSessionWorkType,
        removeProjectData,
        projectTeamspaceEntryId: editSessionWorkType === "consulting" && requiresProjectTeamspaceEntry ? editSessionProjectTeamspaceEntryId : null,
        startedAt: startedAt.toISOString(),
        endedAt: endedAt.toISOString()
      });
      toast.success("Session aktualisiert");
      setEditingSession(null);
      await load();
    } catch (error) {
      toast.error("Session konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingSessionDetails(false);
    }
  }

  async function removeSession(session: SessionEntry) {
    const confirmed = window.confirm(`Session vom ${formatDateTime(session.started_at)} wirklich löschen?`);

    if (!confirmed) {
      return;
    }

    setDeletingId(session.id);
    try {
      const result = await deleteSession(session.id);

      if (result.deleted.projectDeleteAvailable && result.deleted.project_id) {
        setPendingProjectDelete({ projectId: result.deleted.project_id });
        toast.success("Session gelöscht", {
          description: "Für dieses Projekt sind keine Sessions mehr vorhanden."
        });
        return;
      }

      if (result.deleted.ticketDeleted || result.deleted.userTicketEmpty) {
        toast.success("Letzte Session gelöscht", {
          description: result.deleted.ticketDeleted ? "Das leere Ticket wurde entfernt." : "Für dich gibt es zu diesem Ticket keine Einträge mehr."
        });
        onNavigate(returnPath);
        return;
      }

      toast.success("Session gelöscht", {
        description: "Betroffene Abschlüsse wurden wieder geöffnet."
      });
      await load();
    } catch (error) {
      toast.error("Session konnte nicht gelöscht werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setDeletingId(null);
    }
  }

  async function keepEmptyProject() {
    setPendingProjectDelete(null);
    toast.success("Projekt behalten");
    await load();
  }

  async function deleteEmptyProject() {
    if (!pendingProjectDelete) {
      return;
    }

    setDeletingEmptyProject(true);
    try {
      await deleteProject(pendingProjectDelete.projectId);
      toast.success("Projekt gelöscht");
      setPendingProjectDelete(null);
      onNavigate(returnPath);
    } catch (error) {
      toast.error("Projekt konnte nicht gelöscht werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setDeletingEmptyProject(false);
    }
  }

  async function toggleTicketFavorite() {
    if (!ticket?.ticket_number) {
      return;
    }

    setSavingFavorite(true);
    try {
      if (isFavorite) {
        await removeFavoriteTicket(ticket.ticket_number);
        setIsFavorite(false);
        toast.success("Favorit entfernt", {
          description: ticket.ticket_number
        });
        return;
      }

      await addFavoriteTicket(ticket.ticket_number);
      setIsFavorite(true);
      toast.success("Favorit gespeichert", {
        description: ticket.ticket_number
      });
    } catch (error) {
      toast.error(isFavorite ? "Favorit konnte nicht entfernt werden" : "Favorit konnte nicht gespeichert werden", {
        description: error instanceof Error ? error.message : "Unbekannter Fehler"
      });
    } finally {
      setSavingFavorite(false);
    }
  }

  return (
    <div className="space-y-4">
      <div className="flex flex-col gap-3 lg:flex-row lg:items-end lg:justify-between">
        <div>
          <Button variant="ghost" size="sm" className="-ml-2 mb-1 h-8" onClick={() => onNavigate(returnPath)}>
            <ArrowLeft className="size-4" />
            Zurück
          </Button>
          <div className="flex flex-wrap items-center gap-2">
            <h2 className="text-xl font-semibold tracking-normal sm:text-2xl">{ticket?.title || ticket?.ticket_number || "Ticket"}</h2>
            
            {isProject ? <Badge variant="outline">Projekt</Badge> : null}
            <ZammadStateBadge stateId={ticket?.zammad_state_id} />
            <ZammadPriorityBadge priorityId={ticket?.zammad_priority_id} />
            {(periodType === "month" || (isGlobalTicket && globalMonthFilter !== "all")) && data?.closed ? <Badge variant="outline">Monat geschlossen</Badge> : null}
            {ticket?.ticket_number ? <CopyTicketButton ticketNumber={ticket.ticket_number} /> : null}
          </div>
          <p className="text-sm text-muted-foreground">
            {ticket?.title ? `${ticket.ticket_number} · ` : ""}
            Sessions {sessionsScopeLabel}
          </p>
        </div>

        <div className="flex shrink-0 flex-nowrap items-center gap-2">
          {ticket?.ticket_number ? (
            <Button type="button" size="sm" onClick={() => void onStartTimer(ticket.ticket_number)}>
              <Play className="size-4" />
              Timer starten
            </Button>
          ) : null}
          {ticket?.ticket_number ? (
            <Button type="button" size="sm" variant="secondary" onClick={() => setMailImportOpen(true)}>
              <MailPlus className="size-4" />
              Mails importieren
            </Button>
          ) : null}
          {ticket?.ticket_number ? (
            <Button type="button" size="sm" variant={isFavorite ? "default" : "secondary"} disabled={savingFavorite} onClick={() => void toggleTicketFavorite()}>
              <Star className={cn("size-4", isFavorite && "fill-current")} />
              {isFavorite ? "Favorit entfernen" : "Favorit"}
            </Button>
          ) : null}
          <Badge variant={data?.openCount === 0 ? "success" : "warning"}>
            {data?.openCount === 0 ? "Bewertet" : `${data?.openCount ?? 0} offen`}
          </Badge>
        </div>
      </div>

      {(periodType === "month" || (isGlobalTicket && globalMonthFilter !== "all")) && data?.closed ? (
        <Alert variant="success" className="py-3 text-sm">
          Dieser Monat ist abgeschlossen. Bewertungen und Änderungen sind geschützt, bis du den Monat im Monatsabschluss wieder öffnest.
        </Alert>
      ) : null}

      {ticket?.is_foreign_zammad_owner ? (
        <Alert className="py-3 text-sm">
          <AlertCircle className="size-4" />
          <AlertTitle>Anderer Zammad-Owner</AlertTitle>
          <AlertDescription>
            Dieses Ticket gehört in Zammad {zammadOwnerLabel ? `${zammadOwnerLabel}` : "einem anderen Owner"}; du bist {currentZammadUserLabel}. Du kannst deine Sessions sehen, Projekt- und Ticketdaten sind für dich geschützt.
          </AlertDescription>
        </Alert>
      ) : null}

      {ticketManagedByZammad ? (
        <Alert className="py-3 text-sm">
          <AlertCircle className="size-4" />
          <AlertTitle>Ticketdaten werden von Zammad verwaltet</AlertTitle>
          <AlertDescription>
            Nummer, Art, Titel und Organisation wurden durch den Zammad-Sync übernommen und können in TicketTracker nicht manuell geändert werden.
          </AlertDescription>
        </Alert>
      ) : null}

      <div className="grid gap-4">
        <Card>
          <CardHeader className="p-4 pb-2">
            <div className="flex items-start justify-between gap-3">
              <div>
                <CardTitle>Ticketdaten</CardTitle>
                <CardDescription>
                  {canEditTicketData
                    ? "Änderungen an Organisation und Art werden auf alle vorhandenen Sessions dieses Tickets übernommen."
                    : ticketManagedByZammad
                      ? "Nummer, Art, Titel und Organisation kommen aus Zammad und sind lokal gesperrt."
                      : "Nur der Owner kann Ticketdaten ändern."}
                </CardDescription>
              </div>
              <HelpLink anchor="ticketdaten" label="Hilfe zu Ticketdaten" />
            </div>
          </CardHeader>
          <CardContent className="px-4 pb-3">
            <form className="grid gap-3 md:grid-cols-2 xl:grid-cols-[140px_145px_minmax(220px,1fr)_minmax(240px,1.2fr)_150px] xl:items-end" onSubmit={saveTicketData}>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="edit-ticket-number">Ticketnummer</label>
                <Input id="edit-ticket-number" value={editTicketNumber} disabled={!canEditTicketData} onChange={(event) => setEditTicketNumber(event.currentTarget.value)} required />
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="edit-ticket-work-type">Art</label>
                <select
                  id="edit-ticket-work-type"
                  className="h-8 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                  value={editWorkType}
                  disabled={!canEditTicketData}
                  onChange={(event) => setEditWorkType(event.currentTarget.value as WorkType)}
                >
                  <option value="support">Support</option>
                  <option value="consulting">Consulting</option>
                </select>
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="edit-ticket-title">Titel</label>
                <Input id="edit-ticket-title" value={editTicketTitle} disabled={!canEditTicketData} onChange={(event) => setEditTicketTitle(event.currentTarget.value)} placeholder="optional" />
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="edit-ticket-organization">Organisation</label>
                {ticket?.customer_name && !ticket.organization_id ? (
                  <p className="text-xs text-muted-foreground">Bisheriger Freitext: {ticket.customer_name}</p>
                ) : null}
                <OrganizationSelect
                  value={editOrganizationId}
                  selectedName={editOrganizationName}
                  disabled={!canEditTicketData}
                  onChange={(organization) => {
                    setEditOrganizationId(organization.id);
                    setEditOrganizationName(organization.name);
                  }}
                  required
                />
              </div>
              <Button type="submit" className="justify-self-end md:col-span-2 xl:col-span-1 xl:mb-0 xl:w-full" disabled={!canEditTicketData || savingTicket}>
                <Save className="size-4" />
                {savingTicket ? "Speichert..." : "Speichern"}
              </Button>
            </form>
          </CardContent>
        </Card>
      </div>

      <div className={cn("grid gap-4", project && "xl:grid-cols-2")}>
        {project ? (
          <Card>
          <CardHeader className="p-4">
            <div className="flex items-start justify-between gap-3">
              <div>
                <CardTitle className="flex items-center gap-2">
                  <FolderKanban className="size-5 text-muted-foreground" />
                  Projekt
                  {project.closed_at ? <Badge variant="secondary">Geschlossen</Badge> : <Badge variant="success">Offen</Badge>}
                  <ZammadStateBadge stateId={project.zammad_state_id} />
                  <ZammadPriorityBadge priorityId={project.zammad_priority_id} />
                  {!canEditProject ? <Badge variant="outline">geteilt</Badge> : null}
                  {project.close_review_required ? <Badge variant="warning">TS/TT prüfen</Badge> : null}
                  {unassignedTeamspaceEntryCount > 0 ? <Badge variant="warning">{unassignedTeamspaceEntryCount} ohne TS</Badge> : null}
                  {unassignedTeamspaceSubentryCount > 0 ? <Badge variant="warning">{unassignedTeamspaceSubentryCount} ohne Pos.</Badge> : null}
                </CardTitle>
                <CardDescription>
                  {!canEditProject && projectOwnerLabel
                    ? `Eigentümer: ${projectOwnerLabel}`
                    : showBudgetedProjectEntries
                      ? `${budgetedProjectEntries.length} budgetierte Teamspace-Einträge`
                      : budgetedProjectEntries[0] ? teamspaceEntryDisplayLabel(budgetedProjectEntries[0]) : project.teamspace_project || "Kein Teamspace-Projekt hinterlegt"}
                </CardDescription>
              </div>
              <div className="flex shrink-0 items-center gap-1">
                <Button
                  type="button"
                  size="sm"
                  variant="secondary"
                  disabled={!canEditProject || savingProjectStatus}
                  onClick={() => void setProjectClosed(!project.closed_at)}
                >
                  {project.closed_at ? <RotateCcw className="size-4" /> : <CheckCircle2 className="size-4" />}
                  {project.closed_at ? "Öffnen" : "Schließen"}
                </Button>
                <Button type="button" size="sm" variant="secondary" disabled={!canEditProject} onClick={openProjectEditor}>
                  <Pencil className="size-4" />
                  Bearbeiten
                </Button>
                <HelpLink anchor="projekte" label="Hilfe zu Projekten" />
              </div>
            </div>
          </CardHeader>
          <CardContent className="space-y-3 px-4 pb-4">
            {unassignedTeamspaceEntryCount > 0 || unassignedTeamspaceSubentryCount > 0 ? (
              <Alert variant="warning">
                <div className="font-medium">Nicht zugeordnete Sessions</div>
                <div className="text-sm text-muted-foreground">
                  {[
                    unassignedTeamspaceEntryCount > 0 ? `${unassignedTeamspaceEntryCount} Session(s) haben kein Teamspace-Projekt` : null,
                    unassignedTeamspaceSubentryCount > 0 ? `${unassignedTeamspaceSubentryCount} Session(s) haben keine Teamspace-Unterposition` : null
                  ].filter(Boolean).join(". ")}. Bitte über die Session-Bearbeitung neu zuordnen.
                </div>
              </Alert>
            ) : null}
            {project.close_review_required ? (
              <Alert variant="warning">
                <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
                  <div className="space-y-1">
                    <div className="font-medium">{project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4" ? "Merge prüfen" : "Zeiten prüfen"}</div>
                    <div className="text-sm text-muted-foreground">
                      {project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4"
                        ? project.zammad_merged_from_ticket_id
                          ? `Dieses Projekt wurde aus ${project.zammad_merged_from_ticket_number ?? `Zammad-ID ${project.zammad_merged_from_ticket_id}`} übernommen. Teamspace-Projekte und Zuordnungen bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen.`
                          : "Dieses Projekt steht zur TS/TT-Prüfung, obwohl das Zammad-Ticket offen ist. Teamspace-Projekte und Zuordnungen bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen."
                        : "Zammad meldet dieses Consulting-Ticket als geschlossen. Bitte Zeiten in Teamspace und TicketTracker prüfen und das Projekt danach schließen."}
                    </div>
                  </div>
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    className="shrink-0"
                    disabled={savingProjectStatus || !canEditProject}
                    onClick={() => void acknowledgeProjectReviewCheck()}
                  >
                    <CheckCircle2 className="mr-2 h-4 w-4" />
                    Geprüft
                  </Button>
                </div>
              </Alert>
            ) : null}
            <div className="flex flex-wrap gap-2 text-sm">
              <Badge variant="secondary">Zeitraum {project.starts_on || "offen"} - {project.ends_on || "offen"}</Badge>
              <Badge variant="secondary">Kontingent {projectBudgetMinutes ? formatMinutes(projectBudgetMinutes) : "offen"}</Badge>
              <Badge variant="secondary">Verbrauch {formatMinutes(projectConsumptionMinutes)}</Badge>
              <Badge variant={projectRemainingMinutes !== null && projectRemainingMinutes < 0 ? "destructive" : "secondary"}>{projectRemainingLabel(projectRemainingMinutes)}</Badge>
              {showBudgetedProjectEntries ? <Badge variant="outline">{budgetedProjectEntries.length} Budgets</Badge> : null}
            </div>
            <div className="space-y-2">
              <div>
                <div className="mb-1 flex items-center justify-between gap-2 text-xs text-muted-foreground">
                  <span>Budgetverbrauch</span>
                  <span className="inline-flex shrink-0 items-center gap-1 text-right">
                    {projectBudgetMinutes && projectBudgetMinutes > 0 && projectConsumptionMinutes > projectBudgetMinutes ? (
                      <AlertCircle className="size-3.5 text-amber-500" aria-label="Budgetüberschreitung" />
                    ) : null}
                    {projectBudgetMinutes && projectBudgetMinutes > 0
                      ? `${formatMinutes(projectConsumptionMinutes)} / ${formatMinutes(projectBudgetMinutes)} · ${projectRemainingLabel(projectRemainingMinutes)}`
                      : `${formatMinutes(projectConsumptionMinutes)} / offen`}
                  </span>
                </div>
                <div
                  className="h-2 overflow-hidden rounded-full bg-muted"
                  title={projectConsumptionUsagePercent !== null ? `${projectConsumptionUsagePercent}% Verbrauch` : "ohne Gesamtbudget"}
                  aria-label={projectConsumptionUsagePercent !== null ? `${projectConsumptionUsagePercent}% Verbrauch` : "ohne Gesamtbudget"}
                >
                  <div
                    className={cn("h-full rounded-full", projectConsumptionUsagePercent === null ? "bg-muted-foreground/20" : projectConsumptionBarClass(projectConsumptionUsagePercent))}
                    style={{ width: `${projectConsumptionUsagePercent === null ? 0 : Math.min(100, projectConsumptionUsagePercent)}%` }}
                  />
                </div>
              </div>
              {showBudgetedProjectEntries ? (
                <div className="grid gap-1.5 md:grid-cols-2">
                  {budgetedProjectEntries.map((entry) => {
                    const consumption = projectEntryConsumptionById.get(entry.id) ?? Number(entry.consumption_minutes ?? 0);
                    const percent = projectConsumptionPercent(consumption, entry.hour_budget_minutes);
                    const label = teamspaceEntryDisplayLabel(entry);
                    const budgetExceeded = Number(entry.hour_budget_minutes ?? 0) > 0 && consumption > Number(entry.hour_budget_minutes ?? 0);

                    return (
                      <div key={entry.id} className="rounded-md border bg-background/50 px-2 py-1">
                        <div className="mb-1 flex min-w-0 items-center justify-between gap-2 text-[11px]">
                          <span className="truncate text-muted-foreground">
                            {label}
                            {entry.is_default ? " · Standard" : ""}
                          </span>
                          <span className="inline-flex shrink-0 items-center gap-1 font-medium">
                            {budgetExceeded ? <AlertCircle className="size-3.5 text-amber-500" aria-label="Budgetüberschreitung" /> : null}
                            {formatMinutes(consumption)} / {entry.hour_budget_minutes ? formatMinutes(entry.hour_budget_minutes) : "offen"}
                          </span>
                        </div>
                        <div className="h-1 overflow-hidden rounded-full bg-muted">
                          <div
                            className={cn("h-full rounded-full", percent === null ? "bg-muted-foreground/20" : projectConsumptionBarClass(percent))}
                            style={{ width: `${percent === null ? 0 : Math.min(100, percent)}%` }}
                          />
                        </div>
                      </div>
                    );
                  })}
                </div>
              ) : null}
            </div>
            <div className="text-sm">
              <div className="min-w-0">
                <div className="mb-1 flex items-center gap-2 font-medium">
                  <FolderKanban className="size-4 text-muted-foreground" />
                  Beschreibung/Ziele
                </div>
                <p className={cn("whitespace-pre-wrap text-muted-foreground", !projectDescriptionExpanded && "line-clamp-4")}>
                  {projectDescription || "Noch keine Beschreibung/Ziele."}
                </p>
                {projectDescription ? (
                  <Button
                    type="button"
                    size="sm"
                    variant="ghost"
                    className="mt-1 h-7 px-2 text-xs"
                    onClick={() => setProjectDescriptionExpanded((current) => !current)}
                  >
                    {projectDescriptionExpanded ? (
                      <>
                        <ChevronUp className="size-3.5" />
                        Einklappen
                      </>
                    ) : (
                      <>
                        <ChevronDown className="size-3.5" />
                        Vollständig anzeigen
                      </>
                    )}
                  </Button>
                ) : null}
              </div>
            </div>
          </CardContent>
          </Card>
        ) : null}

        <Dialog open={editingProject} onOpenChange={setEditingProject}>
          <DialogContent className="max-h-[calc(100dvh-2rem)] overflow-x-hidden overflow-y-auto sm:max-w-4xl">
            <DialogHeader>
              <DialogTitle>Projekt bearbeiten</DialogTitle>
              <DialogDescription>Projektinformationen zum geöffneten Ticket aktualisieren.</DialogDescription>
            </DialogHeader>
            <form className="space-y-4" onSubmit={saveProjectData}>
              <div className="grid gap-3 lg:grid-cols-[minmax(220px,1fr)_minmax(220px,1fr)]">
                <div className="space-y-2">
                  <label className="text-sm font-medium" htmlFor="project-edit-title">Titel</label>
                  <Input
                    id="project-edit-title"
                    value={projectForm.title}
                    onChange={(event) => setProjectForm({ ...projectForm, title: event.currentTarget.value })}
                    placeholder="optional"
                  />
                </div>
                <div className="space-y-2">
                  <label className="text-sm font-medium">Organisation</label>
                  <OrganizationSelect
                    value={projectForm.organizationId}
                    selectedName={projectForm.organizationName}
                    onChange={(organization) =>
                      setProjectForm({
                        ...projectForm,
                        organizationId: organization.id,
                        organizationName: organization.name
                      })
                    }
                    required
                  />
                </div>
              </div>
              <div className="grid gap-3 sm:grid-cols-2">
                <div className="space-y-2">
                  <label className="text-sm font-medium" htmlFor="project-edit-start">Von</label>
                  <Input id="project-edit-start" type="date" value={projectForm.startsOn} onChange={(event) => setProjectForm({ ...projectForm, startsOn: event.currentTarget.value })} />
                </div>
                <div className="space-y-2">
                  <label className="text-sm font-medium" htmlFor="project-edit-end">Bis</label>
                  <Input id="project-edit-end" type="date" value={projectForm.endsOn} onChange={(event) => setProjectForm({ ...projectForm, endsOn: event.currentTarget.value })} />
                </div>
              </div>
              <ProjectTeamspaceEntriesEditor
                entries={projectForm.teamspaceEntries}
                showManualConsumption={teamspaceTimeTrackingEnabled}
                onChange={(teamspaceEntries) => setProjectForm({ ...projectForm, teamspaceEntries })}
              />
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="project-edit-description">Beschreibung/Ziele</label>
                <Textarea
                  id="project-edit-description"
                  className="min-h-32"
                  value={projectForm.description}
                  onChange={(event) => setProjectForm({ ...projectForm, description: event.currentTarget.value })}
                />
              </div>
              <div className="flex flex-wrap justify-end gap-2">
                <Button
                  type="button"
                  variant="secondary"
                  disabled={savingProjectStatus}
                  onClick={() => void setProjectClosed(!project?.closed_at)}
                >
                  {project?.closed_at ? <RotateCcw className="size-4" /> : <CheckCircle2 className="size-4" />}
                  {project?.closed_at ? "Wieder öffnen" : "Projekt schließen"}
                </Button>
                <Button type="submit" disabled={savingProject}>
                  <Save className="size-4" />
                  {savingProject ? "Speichert..." : "Projekt speichern"}
                </Button>
              </div>
            </form>
          </DialogContent>
        </Dialog>

        <Card>
          <CardHeader className="p-4">
            <div className="flex items-start justify-between gap-3">
              <div>
                <CardTitle className="flex items-center gap-2">
                  <ClipboardList className="size-5 text-muted-foreground" />
                  ToDos
                </CardTitle>
                <CardDescription>Aufgaben zu diesem Ticket oder Projekt verwalten.</CardDescription>
              </div>
              <div className="flex shrink-0 items-center gap-2">
                <div className="flex rounded-md border bg-muted/20 p-0.5">
                  {(["open", "all", "done"] as const).map((value) => (
                    <Button
                      key={value}
                      type="button"
                      size="sm"
                      variant={todoFilter === value ? "default" : "ghost"}
                      className="h-7 px-2 text-xs"
                      onClick={() => setTodoFilter(value)}
                    >
                      {value === "open" ? `Offen ${todoCounts.open}` : value === "done" ? `Erledigt ${todoCounts.done}` : `Alle ${todoCounts.all}`}
                    </Button>
                  ))}
                </div>
                <HelpLink anchor="todos" label="Hilfe zu ToDos" />
              </div>
            </div>
          </CardHeader>
          <CardContent className="px-4 pb-4">
            <TodoPanel ticketId={ticket?.id} todos={visibleTodos} onChanged={load} />
          </CardContent>
        </Card>
      </div>

      {showTeamspaceSubentryCard ? (
        <Card>
          <CardHeader className="p-4">
            <div className="flex items-start justify-between gap-3">
              <div>
                <CardTitle className="flex items-center gap-2">
                  <FolderKanban className="size-5 text-muted-foreground" />
                  Teamspace-Unterpositionen
                </CardTitle>
                <CardDescription>Positionen aus Teamspace für die granulare Zuordnung dieses Projekts.</CardDescription>
              </div>
              <div className="flex shrink-0 flex-wrap justify-end gap-2">
                {canEditProject && projectTeamspaceSubentryCount > 0 ? (
                  <Button
                    type="button"
                    size="sm"
                    variant={editingTeamspaceSubentries ? "outline" : "secondary"}
	                    onClick={() => {
	                      if (editingTeamspaceSubentries) {
	                        setTeamspaceSubentryDrafts(teamspaceSubentryEditDrafts(project));
	                      }

	                      setEditingTeamspaceSubentries(!editingTeamspaceSubentries);
	                    }}
                  >
                    <Pencil className="size-4" />
                    {editingTeamspaceSubentries ? "Abbrechen" : "Bearbeiten"}
                  </Button>
                ) : null}
                <Button
                  type="button"
                  size="sm"
                  variant="secondary"
                  disabled={!canEditProject || !hasProjectTeamspaceApiIds || syncingTeamspaceSubentries}
                  onClick={() => void syncTeamspaceSubentries()}
                >
                  <RefreshCw className={cn("size-4", syncingTeamspaceSubentries && "animate-spin")} />
                  {syncingTeamspaceSubentries ? "Sync..." : "Sync"}
                </Button>
              </div>
            </div>
          </CardHeader>
          <CardContent className="space-y-3 px-4 pb-4">
            {!hasProjectTeamspaceApiIds ? (
              <Alert variant="warning">
                <AlertCircle className="size-4" />
                <AlertTitle>Teamspace-API-ID fehlt</AlertTitle>
                <AlertDescription>Bitte zuerst auf der Zammad-Sync-Seite die Teamspace-IDs verknüpfen.</AlertDescription>
              </Alert>
            ) : null}
            {projectTeamspaceSubentryCount > 0 ? (
              <Accordion
	                type="multiple"
	                value={openTeamspaceSubentryGroups}
	                onValueChange={updateOpenTeamspaceSubentryGroups}
	                className="overflow-hidden rounded-md border bg-background/50"
	              >
                {projectTeamspaceSubentryGroups.map(({ entry, subentries }) => (
                  <AccordionItem key={entry.id} value={entry.id} className="border-b last:border-b-0">
                    <AccordionTrigger className="rounded-none border-l-4 border-l-primary/50 bg-muted/40 px-3 py-2 hover:bg-muted/55 hover:no-underline">
                      <div className="grid min-w-0 flex-1 gap-1 pr-3 text-left sm:grid-cols-[minmax(220px,1fr)_auto] sm:items-center">
                        <div className="min-w-0">
                          <p className="truncate text-sm font-semibold">{teamspaceEntryDisplayLabel(entry)}</p>
                          <p className="truncate text-xs font-normal text-muted-foreground">
                            {entry.teamspace_project || "Ohne Teamspace-ID"}
                            {entry.teamspace_api_project_id ? ` · API ${entry.teamspace_api_project_id}` : ""}
                          </p>
                        </div>
                        <Badge variant="outline" className="h-6 w-fit shrink-0 px-2 text-xs">{subentries.length} Position(en)</Badge>
                      </div>
                    </AccordionTrigger>
                    <AccordionContent className="p-0">
                      <div className="divide-y border-t bg-background">
                        {subentries.map((subentry, index) => {
                          const description = teamspaceFormattedText(subentry.description);
                          const title = teamspaceFormattedText(subentry.alias) || teamspaceFormattedText(subentry.name) || subentry.teamspace_project_id || "Teamspace-Position";
                          const positionDisplayId = teamspacePositionDisplayId(subentry.teamspace_project_id);
                          const fixedPrice = isTeamspaceFixedPricePosition(subentry.billing_type);
                          const fixedPriceFulfilled = fixedPrice && teamspaceFixedPriceFulfilled(subentry);
                          const assignedConsumptionMinutes = Number(subentry.sum_minutes_billable ?? subentry.sum_minutes ?? 0);
                          const fixedPricePlannedMinutes = teamspaceFixedUnitCount(subentry, "planned");
                          const plannedIncome = teamspaceIncomeValue(subentry.planned_income);
                          const sumIncome = teamspaceIncomeValue(subentry.sum_income);
                          const plannedBillableMinutes = Number(subentry.planned_minutes_billable ?? subentry.planned_minutes ?? 0);
                          const budgetExceeded = fixedPrice
                            ? plannedIncome > 0 && sumIncome > plannedIncome
                            : plannedBillableMinutes > 0 && assignedConsumptionMinutes > plannedBillableMinutes;
	                          const usagePercent = fixedPrice ? null : teamspaceBillableUsagePercent(assignedConsumptionMinutes, subentry.planned_minutes_billable);
	                          const draft = teamspaceSubentryDrafts[subentry.id] ?? {
	                            alias: subentry.alias ?? ""
	                          };
	                          const savingSubentry = savingTeamspaceSubentryId === subentry.id;

                          return (
                            <div
                              key={subentry.id}
                              className="grid gap-2 px-3 py-2 text-xs hover:bg-muted/20 lg:grid-cols-[3.5rem_minmax(190px,0.95fr)_minmax(240px,1.45fr)_105px_136px] lg:items-center"
                            >
                              <div className="hidden text-muted-foreground lg:block">{positionDisplayId || index + 1}</div>
                              <div className="min-w-0">
                                <p className="truncate font-medium text-foreground/90">{title}</p>
                                <p className="truncate text-muted-foreground">
                                  {positionDisplayId ? `Position ${positionDisplayId}` : "Ohne Positions-ID"}
                                  {subentry.teamspace_api_project_id ? ` · API ${subentry.teamspace_api_project_id}` : ""}
                                </p>
                              </div>
                              <p className="min-w-0 whitespace-pre-line text-muted-foreground lg:line-clamp-2">
                                {description || "-"}
                              </p>
                              <div className="flex items-center lg:justify-center">
                                {fixedPrice ? (
                                  <span
                                    className={cn(
                                      "inline-flex h-6 items-center justify-center gap-1 rounded-full border px-2 text-[11px] font-semibold",
                                      fixedPriceFulfilled
                                        ? "border-emerald-500/30 bg-emerald-500/10 text-emerald-700 dark:text-emerald-300"
                                        : "border-muted-foreground/20 bg-muted/40 text-muted-foreground"
                                    )}
                                    title={fixedPriceFulfilled ? "Teamspace-Soll erreicht" : "Teamspace-Soll noch offen"}
                                  >
                                    {fixedPriceFulfilled ? <CheckCircle2 className="size-3" /> : null}
                                    {fixedPriceFulfilled ? "Abgerechnet" : "Offen"}
                                    {budgetExceeded ? <AlertCircle className="size-3 text-amber-500" /> : null}
                                  </span>
                                ) : usagePercent !== null ? (
                                  <span className={cn("inline-flex h-6 min-w-10 items-center justify-center gap-1 rounded-full border px-2 text-[11px] font-semibold", teamspaceProgressClass(usagePercent))}>
                                    {usagePercent}%
                                    {budgetExceeded ? <AlertCircle className="size-3 text-amber-500" /> : null}
                                  </span>
                                ) : (
                                  <span className="inline-flex h-6 min-w-10 items-center justify-center rounded-full border border-muted-foreground/20 bg-muted/40 px-2 text-[11px] font-semibold text-muted-foreground">
                                    -
                                  </span>
                                )}
                              </div>
                              <div className="grid grid-cols-[auto_1fr] gap-x-3 text-muted-foreground lg:block lg:text-right">
                                <span className="lg:hidden">Billable</span>
                                <span className="block">
                                  {fixedPrice
                                    ? "Stückposition"
                                    : (
                                        <>
                                          {formatMinutes(assignedConsumptionMinutes)}
                                          {subentry.planned_minutes_billable ? ` / ${formatMinutes(subentry.planned_minutes_billable)}` : ""}
                                        </>
                                      )}
                                </span>
	                                {fixedPrice ? (
                                    <span className="block text-[11px] text-muted-foreground/85">
                                      TS {formatMinutes(assignedConsumptionMinutes)}
                                      {fixedPricePlannedMinutes > 0 ? ` / ${formatMinutes(fixedPricePlannedMinutes)}` : ""}
                                    </span>
                                  ) : (
                                    <span className="block text-[11px] text-muted-foreground/85">
                                      TS {formatMinutes(assignedConsumptionMinutes)}
                                    </span>
                                )}
                              </div>
                              {canEditProject && editingTeamspaceSubentries ? (
	                                <div className={cn(
	                                  "grid gap-2 rounded-md border border-dashed bg-muted/10 p-2 lg:col-span-5 lg:items-end",
	                                  "lg:grid-cols-[minmax(150px,1fr)_auto]"
	                                )}>
                                  <div className="space-y-1">
                                    <label className="text-[11px] font-medium text-muted-foreground" htmlFor={`subentry-alias-${subentry.id}`}>Alias</label>
                                    <Input
                                      id={`subentry-alias-${subentry.id}`}
                                      className="h-8 text-xs"
                                      value={draft.alias}
                                      onChange={(event) => {
                                        const alias = event.currentTarget.value;

                                        setTeamspaceSubentryDrafts((current) => ({
                                          ...current,
                                          [subentry.id]: {
                                            ...(current[subentry.id] ?? draft),
                                            alias
                                          }
                                        }));
                                      }}
                                    />
                                  </div>
	                                  <Button
                                    type="button"
                                    size="sm"
                                    className="h-8"
                                    disabled={savingSubentry}
                                    onClick={() => void saveTeamspaceSubentry(subentry)}
                                  >
                                    <Save className="size-3.5" />
                                    {savingSubentry ? "..." : "OK"}
                                  </Button>
                                </div>
                              ) : null}
                            </div>
                          );
                        })}
                      </div>
                    </AccordionContent>
                  </AccordionItem>
                ))}
              </Accordion>
            ) : (
              <p className="rounded-md border bg-muted/20 p-3 text-sm text-muted-foreground">
                Noch keine Unterpositionen synchronisiert.
              </p>
            )}
          </CardContent>
        </Card>
      ) : null}

      <Card>
        <CardHeader className="gap-3 p-4 sm:flex-row sm:items-start sm:justify-between sm:space-y-0">
          <div>
            <CardTitle>Session-Einträge</CardTitle>
            <CardDescription>Wähle für jede Session genau eine Bewertung aus oder lösche falsche Einträge.</CardDescription>
          </div>
          <div className="flex flex-wrap items-center gap-2">
            <div className="flex items-center gap-2 rounded-md border bg-muted/30 px-3 py-2 text-sm">
              <span className="text-muted-foreground">Abgerechnet</span>
              <span className="font-semibold">{formatMinutes(periodTotalMinutes)}</span>
            </div>
            <div className="flex items-center gap-2 rounded-md border bg-muted/30 px-3 py-2 text-sm">
              <span className="text-muted-foreground">{teamspaceLabel}</span>
              <span className="font-semibold">{formatMinutes(periodTeamspaceMinutes)}</span>
            </div>
            <HelpLink anchor="ticketdetail" label="Hilfe zur Ticketdetailansicht" />
          </div>
        </CardHeader>
        <CardContent className="px-4 pb-4">
          {isGlobalTicket ? (
            <div className="mb-3 grid gap-3 rounded-md border bg-muted/15 p-3 md:grid-cols-3">
              <div className="space-y-1.5">
                <label className="text-xs font-medium text-muted-foreground" htmlFor="ticket-month-filter">Monat</label>
                <select
                  id="ticket-month-filter"
                  className="h-9 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                  value={globalMonthFilter}
                  onChange={(event) => setGlobalMonthFilter(event.currentTarget.value)}
                >
                  <option value="all">Alle Monate</option>
                  {globalMonthFilter !== "all" && !selectedMonthHasSessions ? <option value={globalMonthFilter}>{globalMonthFilter} (0)</option> : null}
                  {availableMonths.map((month) => (
                    <option key={month.month} value={month.month}>
                      {month.month} ({month.session_count})
                    </option>
                  ))}
                </select>
              </div>
              <div className="space-y-1.5">
                <label className="text-xs font-medium text-muted-foreground" htmlFor="ticket-status-filter">Bewertung</label>
                <select
                  id="ticket-status-filter"
                  className="h-9 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                  value={globalStatusFilter}
                  onChange={(event) => setGlobalStatusFilter(event.currentTarget.value as typeof globalStatusFilter)}
                >
                  <option value="all">Alle Bewertungen</option>
                  <option value="open">Offen</option>
                  <option value="billable">Abrechenbar</option>
                  <option value="billed">Abgerechnet</option>
                  <option value="non_billable">Nicht abrechenbar</option>
                </select>
              </div>
              <div className="space-y-1.5">
                <label className="text-xs font-medium text-muted-foreground" htmlFor="ticket-source-filter">Quelle</label>
                <select
                  id="ticket-source-filter"
                  className="h-9 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                  value={globalSourceFilter}
                  onChange={(event) => setGlobalSourceFilter(event.currentTarget.value as typeof globalSourceFilter)}
                >
                  <option value="all">Alle Quellen</option>
                  <option value="manual">Manuell</option>
                  <option value="recurring">Fix</option>
                </select>
              </div>
            </div>
          ) : null}

          {data?.sessions.length ? (
            <div className="mb-3 flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
              {teamspaceTabs.length > 0 ? (
                <div className="flex min-w-0 flex-wrap gap-1 rounded-md border bg-muted/20 p-1">
                  {teamspaceTabs.map((tab) => (
                    <Button
                      key={tab.id}
                      type="button"
                      size="sm"
                      variant={activeTeamspaceEntryId === tab.id ? "default" : "ghost"}
                      className="h-auto max-w-full min-w-36 flex-col items-start justify-center gap-0.5 py-1.5 text-left"
                      onClick={() => setSelectedTeamspaceEntryId(tab.id)}
                    >
                      <span className="truncate">{tab.label}</span>
                      {tab.description ? <span className="max-w-56 truncate text-[11px] font-normal opacity-80">{tab.description}</span> : null}
                    </Button>
                  ))}
                </div>
              ) : (
                <span />
              )}
              <Button type="button" size="sm" variant="secondary" onClick={toggleAllSessionDetails}>
                {allSessionsExpanded ? (
                  <>
                    <ChevronUp className="size-4" />
                    Alle einklappen
                  </>
                ) : (
                  <>
                    <ChevronDown className="size-4" />
                    Alle aufklappen
                  </>
                )}
              </Button>
            </div>
          ) : null}

          <div className="space-y-2">
            {sessionGroups.map((group) => (
              <div key={group.key} className="rounded-md border bg-background">
                <div className="grid min-w-0 gap-2 border-b bg-muted/25 px-3 py-2 lg:grid-cols-[220px_minmax(0,150px)_minmax(260px,1fr)_220px] lg:items-center">
                  <div className="min-w-0 text-left">
                    <p className="truncate font-medium">{group.label}</p>
                    <p className="text-xs text-muted-foreground">{group.sessions.length} Session(s)</p>
                  </div>
                  <Button
                    type="button"
                    size="sm"
                    variant="secondary"
                    className="h-8 min-w-32 justify-center justify-self-start"
                    title="Teamspace-Aufbereitung"
                    onClick={() => openTeamspacePreparation(group)}
                  >
                    <ClipboardList className="size-3.5" />
                    TS
                  </Button>
                  <div className="grid min-w-0 grid-cols-3 gap-2 lg:gap-3">
                    <Badge variant="outline" className="flex h-8 min-w-0 justify-center gap-1 whitespace-nowrap px-2" title="Abrechenbar">
                      <Play className="size-3.5 shrink-0" />
                      <span className="truncate">{formatMinutes(group.billableMinutes)}</span>
                    </Badge>
                    <Badge variant="outline" className="flex h-8 min-w-0 justify-center gap-1 whitespace-nowrap px-2" title="Abgerechnet">
                      <CheckCircle2 className="size-3.5 shrink-0" />
                      <span className="truncate">{formatMinutes(group.totalMinutes)}</span>
                    </Badge>
                    <Badge variant="secondary" className="flex h-8 min-w-0 justify-center gap-1 whitespace-nowrap px-2" title="Nicht abrechenbar">
                      <EyeOff className="size-3.5 shrink-0" />
                      <span className="truncate">{formatMinutes(group.nonBillableMinutes)}</span>
                    </Badge>
                  </div>
		                  <div className="flex min-w-0 items-center justify-start gap-2 lg:justify-end">
                        {teamspaceTimeTrackingEnabled ? (
		                      <div className="flex min-w-0 items-center gap-1.5 text-xs text-muted-foreground">
	                        <label htmlFor={`crm-billing-${group.key}`}>Teamspace</label>
	                        <Input
	                          id={`crm-billing-${group.key}`}
	                          type="text"
	                          className="h-8 w-20 bg-background text-right"
	                          autoComplete="off"
	                          inputMode="decimal"
	                          value={dayBillingInputs[group.key] ?? ""}
	                          disabled={isPeriodClosed || savingDayBillingKey === group.key}
	                          placeholder="0"
	                          onChange={(event) => {
	                            const nextValue = event.currentTarget.value;
	
	                            if (!isPartialHoursInput(nextValue)) {
	                              return;
	                            }
	
	                            setDayBillingInputs((current) => ({
	                              ...current,
	                              [group.key]: nextValue
	                            }));
	                          }}
	                          onKeyDown={(event) => {
	                            if (event.key === "Enter") {
	                              event.preventDefault();
	                            }
	                          }}
	                        />
	                        <span>h</span>
	                        <Button
	                          type="button"
	                          size="icon"
	                          className={cn("size-7 shrink-0", !isDayBillingDirty(group.key) && "invisible")}
	                          disabled={isPeriodClosed || !isDayBillingDirty(group.key) || savingDayBillingKey === group.key}
	                          title={savingDayBillingKey === group.key ? "Speichert..." : "Speichern"}
	                          onMouseDown={(event) => event.preventDefault()}
	                          onClick={() => void saveDayBilling(group)}
	                        >
	                          <Save className="size-3.5" />
		                          <span className="sr-only">{savingDayBillingKey === group.key ? "Speichert..." : "Speichern"}</span>
		                        </Button>
		                      </div>
                        ) : (
                          <span className="text-xs text-muted-foreground">Teamspace-Erfassung aus</span>
                        )}
		                  </div>
                </div>
                <div className="space-y-1.5 p-2 sm:p-3 lg:px-0">
                  {group.sessions.map((session) => {
                    const expanded = expandedSessionIds.includes(session.id);
                    const zammadSent = session.zammad_article_status === "sent";
                    const zammadPending = session.zammad_article_status === "pending";
                    const zammadMailImported = Boolean(session.zammad_source_article_id);
		                    const canSendZammad = !zammadMailImported && (session.activity.trim().length > 0 || Boolean(session.zammad_article_body));
		                    const sendingZammad = sendingZammadSessionId === session.id;
		                    const billedMissingTeamspaceEntry =
                          teamspaceTimeTrackingEnabled
                          && session.work_type === "consulting"
                          && (session.billing_status === "billable" || session.billing_status === "billed")
                          && !session.project_teamspace_entry_id;

                    return (
                      <div key={session.id} className="rounded-md border bg-card/40">
                        <div className="grid gap-2 p-2 lg:grid-cols-[220px_minmax(0,150px)_minmax(260px,1fr)_220px] lg:items-center">
                          <button
                            type="button"
                            className="flex min-w-0 items-center gap-2 rounded-md text-left text-sm text-muted-foreground hover:cursor-pointer hover:text-foreground focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                            onClick={() => toggleSessionDetails(session.id)}
                            aria-expanded={expanded}
                          >
                            {expanded ? <ChevronUp className="size-4 shrink-0" /> : <ChevronDown className="size-4 shrink-0" />}
                            <span className="truncate">
                              {formatTimeRange(session.started_at, session.ended_at)}
                            </span>
	                            {zammadMailImported ? (
	                              <Badge variant="info" className="shrink-0 gap-1">
	                                <MailCheck className="size-3" />
	                                Mail
	                              </Badge>
	                            ) : null}
	                            {billedMissingTeamspaceEntry ? (
	                              <Badge variant="warning" className="shrink-0 gap-1" title="Abgerechnete Session ohne Teamspace-Projekt">
	                                <AlertCircle className="size-3" />
	                                ohne TS
	                              </Badge>
	                            ) : null}
	                          </button>
                          <div className="flex min-w-0 flex-col items-start gap-1">
                            <Badge variant="outline" className="w-fit">{formatMinutes(session.rounded_minutes)}</Badge>
                            {session.recurring_billing_id ? <Badge variant="secondary">fix</Badge> : null}
                          </div>
	                          <BillingButtons
	                            session={session}
	                            disabled={isPeriodClosed}
	                            loading={loadingId === session.id}
	                            onChange={(value) => setBilling(session.id, value)}
	                          />
                          <div className="grid grid-cols-[2rem_2rem_2rem] gap-1 lg:justify-end">
                            {zammadMailImported ? (
                              <span className="size-8" aria-hidden="true" />
                            ) : zammadSent ? (
                              <span
                                className="inline-flex size-8 items-center justify-center rounded-md text-emerald-600"
                                title="An Zammad übertragen"
                                aria-label="An Zammad übertragen"
                              >
                                <Send className="size-4" />
                              </span>
                            ) : (
                              <Button
                                size="icon"
                                variant="ghost"
                                className="size-8"
                                disabled={!canSendZammad || sendingZammad}
                                title={canSendZammad ? (zammadPending ? "Geparkte Zammad-Notiz erneut senden" : "Zammad-Notiz senden") : "Keine Zammad-Notiz: Tätigkeit leer"}
                                onClick={() => void sendSessionToZammad(session)}
                              >
                                {zammadPending || sendingZammad ? <RotateCcw className="size-4" /> : <Send className="size-4" />}
                                <span className="sr-only">{zammadPending ? "Geparkte Zammad-Notiz erneut senden" : "Zammad-Notiz senden"}</span>
                              </Button>
                            )}
                            <Button size="icon" variant="ghost" className="size-8" onClick={() => openSessionEditor(session)}>
                              <Pencil className="size-4" />
                              <span className="sr-only">Session bearbeiten</span>
                            </Button>
                            <Button
                              size="icon"
                              variant="ghost"
                              className="size-8 text-destructive hover:text-destructive"
                              disabled={deletingId === session.id}
                              onClick={() => removeSession(session)}
                            >
                              <Trash2 className="size-4" />
                              <span className="sr-only">Session löschen</span>
                            </Button>
                          </div>
                        </div>
                        {expanded ? (
                          <div className="border-t px-3 pb-3 pt-2">
                            <SessionActivityBody session={session} />
                            <div className="mt-2 flex flex-wrap gap-x-3 gap-y-1 text-xs text-muted-foreground">
                              <span>{session.organization_name ?? session.customer_name}</span>
                              <span>{session.work_type === "support" ? "Support" : "Consulting"}</span>
                              {zammadMailImported ? (
                                <span className="inline-flex items-center gap-1">
                                  <MailCheck className="size-3.5 text-sky-500" aria-hidden="true" />
                                  <span>Zammad-Mail importiert · Article {session.zammad_source_article_id}</span>
                                </span>
                              ) : null}
                              {!zammadMailImported ? (
                                <span className="inline-flex items-center gap-1">
                                  {zammadSent ? <Send className="size-3.5 text-emerald-500" aria-hidden="true" /> : zammadPending ? <RotateCcw className="size-3.5 text-amber-500" aria-hidden="true" /> : <Send className="size-3.5 text-muted-foreground/60" aria-hidden="true" />}
                                  <span>
                                    {zammadSent
                                      ? `Zammad übertragen · ${zammadArticleTypeLabel(session.zammad_article_type_id)}`
                                      : zammadPending
                                        ? `Zammad geparkt · ${zammadArticleTypeLabel(session.zammad_article_type_id)}`
                                        : canSendZammad
                                          ? "Nicht an Zammad übertragen"
                                          : "Keine Zammad-Notiz (Tätigkeit leer)"}
                                  </span>
                                </span>
                              ) : null}
                              <span>Erfasst {formatDateTime(session.created_at)}</span>
                            </div>
                          </div>
                        ) : null}
                      </div>
                    );
                  })}
                </div>
              </div>
            ))}
          </div>

          {data?.sessions.length === 0 ? (
            <p className="py-8 text-center text-sm text-muted-foreground">Keine Sessions für dieses Ticket im gewählten Filter.</p>
          ) : null}
        </CardContent>
      </Card>
      {isRecurringBillingTicket ? (
        <Alert variant="warning">
          <div className="font-medium">Fixe Abrechnung</div>
          <div className="text-sm text-muted-foreground">Sessions für dieses Ticket werden ausschließlich aus der Definition erzeugt. Manuelles Nachtragen ist deaktiviert.</div>
        </Alert>
      ) : (
        <Card>
          <CardHeader className="p-4">
            <div className="flex items-start justify-between gap-3">
              <div>
                <CardTitle>Session nachtragen</CardTitle>
                <CardDescription>Neue Zeit direkt diesem Ticket zuordnen.</CardDescription>
              </div>
              <HelpLink anchor="session-nachtragen" label="Hilfe zum Nachtragen von Sessions" />
            </div>
          </CardHeader>
          <CardContent className="px-4 pb-4">
            <form className="grid gap-4 xl:grid-cols-2" onSubmit={submitTicketSession}>
              <div className="space-y-4">
                {ticket?.organization_id && ticket.work_type ? (
                  <div className="grid gap-2 rounded-md border bg-muted/30 p-3 text-sm sm:grid-cols-[1fr_auto] sm:items-center">
                    <span className="min-w-0 truncate font-medium">{ticket.organization_name ?? ticket.customer_name}</span>
                    <Badge variant="outline">{ticket.work_type === "support" ? "Support" : "Consulting"}</Badge>
                  </div>
                ) : (
                  <div className="grid gap-3 sm:grid-cols-[minmax(0,1fr)_160px]">
                    <div className="space-y-2">
                      <label className="text-sm font-medium">Organisation</label>
                      {ticket?.customer_name && !ticket.organization_id ? (
                        <p className="text-xs text-muted-foreground">Bisheriger Freitext: {ticket.customer_name}</p>
                      ) : null}
                      <OrganizationSelect
                        value={ticketSession.organizationId}
                        selectedName={ticketSession.organizationName}
                        onChange={(organization) =>
                          setTicketSession({
                            ...ticketSession,
                            organizationId: organization.id,
                            organizationName: organization.name
                          })
                        }
                        required
                      />
                    </div>
                    <div className="space-y-2">
                      <label className="text-sm font-medium" htmlFor="ticket-session-work-type">
                        Art
                      </label>
                      <select
                        id="ticket-session-work-type"
                        className="h-8 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                        value={ticketSession.workType}
                        onChange={(event) => setTicketSession({ ...ticketSession, workType: event.currentTarget.value as WorkType })}
                      >
                        <option value="support">Support</option>
                        <option value="consulting">Consulting</option>
                      </select>
                    </div>
                  </div>
                )}

                {requiresProjectTeamspaceEntry ? (
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-teamspace-entry">Teamspace-Eintrag</label>
                    <select
                      id="ticket-session-teamspace-entry"
                      className="h-9 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                      value={ticketSession.projectTeamspaceEntryId}
                      onChange={(event) => setTicketSession({ ...ticketSession, projectTeamspaceEntryId: event.currentTarget.value })}
                      required
                    >
                      <option value="">Bitte wählen</option>
                      {projectEntries.map((entry) => (
                        <option key={entry.id} value={entry.id}>
                          {teamspaceEntryOptionLabel(entry)}
                        </option>
                      ))}
                    </select>
                    {teamspaceEntryDescription(selectedTicketSessionTeamspaceEntry) ? (
                      <p className="text-xs text-muted-foreground">{teamspaceEntryDescription(selectedTicketSessionTeamspaceEntry)}</p>
                    ) : null}
                  </div>
                ) : null}

                <div className="grid gap-3 sm:grid-cols-2">
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-start">
                      Von
                    </label>
                    <Input
                      id="ticket-session-start"
                      type="time"
                      value={ticketSession.startTime}
                      onChange={(event) => setTicketSession({ ...ticketSession, startTime: event.currentTarget.value })}
                      required
                    />
                  </div>
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-end">
                      Bis
                    </label>
                    <Input
                      id="ticket-session-end"
                      type="time"
                      value={ticketSession.endTime}
                      onChange={(event) => setTicketSession({ ...ticketSession, endTime: event.currentTarget.value })}
                      required
                    />
                  </div>
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-day">
                      Datum
                    </label>
                    <Input
                      id="ticket-session-day"
                      type="date"
                      value={ticketSession.day}
                      onChange={(event) => setTicketSession({ ...ticketSession, day: event.currentTarget.value })}
                      required
                    />
                  </div>
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-billing-status">
                      Bewertung
                    </label>
                    <BillingCaptureSelect
                      id="ticket-session-billing-status"
                      value={ticketSession.billingStatus}
                      onChange={(billingStatus) => setTicketSession({ ...ticketSession, billingStatus })}
                    />
                  </div>
                </div>

                <label className="flex min-h-10 items-start gap-2 rounded-md border bg-background p-3 text-sm">
                  <Checkbox
                    checked={ticketSession.createZammadArticle}
                    onCheckedChange={(checked) => setTicketSession({ ...ticketSession, createZammadArticle: checked === true })}
                  />
                  <span>
                    <span className="block font-medium">Interne Zammad-Notiz erstellen</span>
                    <span className="block text-xs text-muted-foreground">Überträgt die Tätigkeit inklusive time_unit nach Zammad oder parkt sie bei Fehlern.</span>
                  </span>
                </label>
                {ticketSession.createZammadArticle ? (
                  <div className="space-y-2">
                    <label className="text-sm font-medium" htmlFor="ticket-session-zammad-article-type">
                      Zammad-Typ
                    </label>
                    <select
                      id="ticket-session-zammad-article-type"
                      className="h-10 w-full rounded-md border border-input bg-background px-3 text-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
                      value={zammadArticleTypeValue(ticketSession.zammadArticleTypeId)}
                      onChange={(event) => setTicketSession({ ...ticketSession, zammadArticleTypeId: zammadArticleTypeFromValue(event.currentTarget.value) })}
                    >
                      {zammadArticleTypeOptions.map((option) => (
                        <option key={option.value || "empty"} value={option.value}>
                          {option.label}
                        </option>
                      ))}
                    </select>
                  </div>
                ) : null}
              </div>

              <div className="flex min-h-0 flex-col space-y-2">

                <div className="min-h-72 flex-1 [&>div]:flex [&>div]:h-full [&>div]:flex-col [&_[role=textbox]]:min-h-72 xl:[&_[role=textbox]]:flex-1">
                  <RichActivityEditor
                    key={`ticket-session-${ticketId}`}
                    id="ticket-session-activity"
                    value={ticketSession.activity}
                    htmlValue={ticketSession.zammadArticleBody}
                    onChange={(activity, zammadArticleBody) => setTicketSession((current) => ({ ...current, activity, zammadArticleBody }))}
                  />
                </div>
              </div>
              <div className="flex justify-end xl:col-start-2">
                <Button type="submit" disabled={savingTicketSession}>
                  <Save className="size-4" />
                  {savingTicketSession ? "Speichert..." : "Nachtragen"}
                </Button>
              </div>
            </form>
          </CardContent>
        </Card>
      )}

      
      {data && data.openCount > 0 ? (
        <p className="text-sm text-muted-foreground">
          Noch {data.openCount} Session(s) ohne Auswahl. Erst wenn im Monat keine Sessions mehr offen sind, kann der Monat abgeschlossen werden.
        </p>
      ) : null}

	      <Dialog open={Boolean(teamspacePreparation)} onOpenChange={(open) => !open && setTeamspacePreparation(null)}>
        <DialogContent className="max-h-[calc(100dvh-2rem)] w-[calc(100vw-2rem)] overflow-y-auto p-5 sm:max-w-2xl">
          <DialogHeader className="pr-8">
            <DialogTitle>TS Aufbereitung</DialogTitle>
            <DialogDescription>{teamspacePreparation?.label ?? "Sessiontätigkeiten des Tages"}</DialogDescription>
          </DialogHeader>
          <div className="space-y-4">
            <Textarea
              className="min-h-80 resize-y font-mono text-sm"
              value={teamspacePreparation?.text ?? ""}
              onChange={(event) =>
                setTeamspacePreparation((current) =>
                  current
                    ? {
                        ...current,
                        text: event.currentTarget.value
                      }
                    : current
                )
              }
            />
            <div className="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
              <Button type="button" variant="secondary" onClick={() => setTeamspacePreparation(null)}>
                Schließen
              </Button>
              <Button type="button" disabled={!teamspacePreparation?.text.trim()} onClick={() => void copyTeamspacePreparation()}>
                <Copy className="size-4" />
                Kopieren
              </Button>
            </div>
          </div>
        </DialogContent>
      </Dialog>

      <Dialog open={mailImportOpen} onOpenChange={setMailImportOpen}>
        <DialogContent className="max-h-[calc(100dvh-2rem)] w-[calc(100vw-2rem)] overflow-y-auto p-5 sm:max-w-3xl">
          <DialogHeader className="pr-8">
            <DialogTitle>Zammad-Mails importieren</DialogTitle>
            <DialogDescription>Eigene eMail-Artikel übernehmen. Rückblick: {mailDaysBack} Tag(e).</DialogDescription>
          </DialogHeader>
          <div className="space-y-3">
            <div className="flex flex-wrap justify-end gap-2">
              {mailPreview?.items.length ? (
                <Button type="button" size="sm" disabled={importingMailSessions || selectedMailArticleIds.length === 0} onClick={() => void importTicketMailSessions()}>
                  <CheckCircle2 className="size-3.5" />
                  {importingMailSessions ? "Importiert..." : `Auswahl übernehmen (${selectedMailArticleIds.length})`}
                </Button>
              ) : null}
              <Button type="button" size="sm" variant={mailPreview ? "outline" : "default"} disabled={!canPreviewMailSessions || loadingMailPreview || importingMailSessions} onClick={() => void previewTicketMailSessions()}>
                <MailPlus className="size-3.5" />
                {loadingMailPreview ? "Lädt..." : "Vorschau laden"}
              </Button>
            </div>

            {!canPreviewMailSessions ? (
              <Alert variant="warning">
                <AlertCircle className="size-4" />
                <AlertTitle>Mail-Sync nicht bereit</AlertTitle>
                <AlertDescription>Dieses Ticket braucht eine Support/Consulting-Art und dein Profil einen gültigen Zammad-Token.</AlertDescription>
              </Alert>
            ) : null}

            {mailPreview ? (
              <div className="space-y-2">
                <div className="flex flex-wrap items-center justify-between gap-2 rounded-md border bg-muted/20 px-3 py-2">
                  <label className="flex items-center gap-2 text-sm text-muted-foreground">
                    <Checkbox checked={allMailSelected} disabled={mailPreview.items.length === 0} onCheckedChange={(checked) => toggleAllMailSelection(checked === true)} />
                    {selectedMailArticleIds.length} von {mailPreview.items.length} Mail-Session(s) ausgewählt.
                  </label>
                  {mailPreview.skipped > 0 || mailPreview.errors.length > 0 ? (
                    <span className="text-xs text-muted-foreground">
                      {mailPreview.skipped} ohne Transfer, {mailPreview.errors.length} Fehler
                    </span>
                  ) : null}
                </div>

                {mailPreview.items.length === 0 ? (
                  <p className="rounded-md border bg-muted/10 px-3 py-4 text-center text-sm text-muted-foreground">Keine importierbaren Mails für dieses Ticket gefunden.</p>
                ) : (
                  <div className="space-y-1.5">
                    {mailPreview.items.map((item: TicketZammadMailSessionItem) => (
                      <label key={item.articleId} className="grid gap-2 rounded-md border bg-background p-2 sm:grid-cols-[auto_minmax(0,1fr)_auto] sm:items-center">
                        <Checkbox checked={mailSelection[item.articleId] !== false} onCheckedChange={(checked) => toggleMailSelection(item.articleId, checked === true)} />
                        <span className="min-w-0">
                          <span className="block truncate text-sm font-medium">{item.subject || "eMail aus Zammad"}</span>
                          <span className="block text-xs text-muted-foreground">
                            Article {item.articleId} · {formatDateTime(item.createdAt)} · {formatTimeRange(item.createdAt, item.endedAt)}
                          </span>
                        </span>
                        <Badge variant="outline" className="w-fit justify-self-start sm:justify-self-end">{formatMinutes(Math.round(item.durationSeconds / 60))}</Badge>
                      </label>
                    ))}
                  </div>
                )}
              </div>
            ) : canPreviewMailSessions ? (
              <p className="rounded-md border bg-muted/10 px-3 py-6 text-center text-sm text-muted-foreground">Lade zuerst die Vorschau, um importierbare Mails auszuwählen.</p>
            ) : null}
          </div>
        </DialogContent>
      </Dialog>

      <Dialog open={Boolean(pendingProjectDelete)} onOpenChange={(open) => !open && void keepEmptyProject()}>
        <DialogContent className="sm:max-w-md">
          <DialogHeader>
            <DialogTitle>Keine Sessions mehr vorhanden</DialogTitle>
            <DialogDescription>Projekt löschen?</DialogDescription>
          </DialogHeader>
          <div className="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
            <Button type="button" variant="secondary" disabled={deletingEmptyProject} onClick={() => void keepEmptyProject()}>
              Projekt behalten
            </Button>
            <Button type="button" variant="destructive" disabled={deletingEmptyProject} onClick={() => void deleteEmptyProject()}>
              <Trash2 className="size-4" />
              {deletingEmptyProject ? "Löscht..." : "Projekt löschen"}
            </Button>
          </div>
        </DialogContent>
      </Dialog>

      <Dialog open={Boolean(editingSession)} onOpenChange={(open) => !open && setEditingSession(null)}>
        <DialogContent className="max-h-[calc(100dvh-2rem)] w-[calc(100vw-2rem)] overflow-y-auto p-5 sm:max-w-2xl">
          <DialogHeader className="pr-8">
            <DialogTitle>Session bearbeiten</DialogTitle>
            <DialogDescription>Beginn, Ende, Tätigkeit und Stammdaten dieses Eintrags nachträglich korrigieren.</DialogDescription>
          </DialogHeader>
          <form className="space-y-4 overflow-x-hidden" onSubmit={saveSessionData}>
            <div className="grid gap-3 sm:grid-cols-3">
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="session-day">Datum</label>
                <Input
                  id="session-day"
                  type="date"
                  value={editSessionDay}
                  onChange={(event) => setEditSessionDay(event.currentTarget.value)}
                  required
                />
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="session-start-time">Von</label>
                <Input
                  id="session-start-time"
                  type="time"
                  value={editSessionStartTime}
                  onChange={(event) => setEditSessionStartTime(event.currentTarget.value)}
                  required
                />
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="session-end-time">Bis</label>
                <Input
                  id="session-end-time"
                  type="time"
                  value={editSessionEndTime}
                  onChange={(event) => setEditSessionEndTime(event.currentTarget.value)}
                  required
                />
              </div>
            </div>
            <div className="space-y-2">
              <label className="text-sm font-medium" htmlFor="session-organization">Organisation</label>
              {editingSession?.customer_name && !editingSession.organization_id ? (
                <p className="text-xs text-muted-foreground">Bisheriger Freitext: {editingSession.customer_name}</p>
              ) : null}
              <OrganizationSelect
                value={editSessionOrganizationId}
                selectedName={editSessionOrganizationName}
                onChange={(organization) => {
                  setEditSessionOrganizationId(organization.id);
                  setEditSessionOrganizationName(organization.name);
                }}
                required
              />
            </div>
            <div className="space-y-2">
              <RichActivityEditor
                key={editingSession?.id ?? "session-activity-empty"}
                id="session-activity"
                value={editSessionActivity}
                htmlValue={editSessionZammadArticleBody}
                onChange={(activity, zammadArticleBody) => {
                  setEditSessionActivity(activity);
                  setEditSessionZammadArticleBody(zammadArticleBody);
                }}
              />
            </div>
            <div className="space-y-2">
              <label className="text-sm font-medium" htmlFor="session-work-type">Art</label>
              <select
                id="session-work-type"
                className="h-8 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                value={editSessionWorkType}
                disabled={Boolean(editingSession?.recurring_billing_id)}
                onChange={(event) => setEditSessionWorkType(event.currentTarget.value as WorkType)}
              >
                <option value="support">Support</option>
                <option value="consulting">Consulting</option>
              </select>
            </div>
            {editSessionWorkType === "consulting" && requiresProjectTeamspaceEntry ? (
              <div className="space-y-2">
                <label className="text-sm font-medium" htmlFor="session-teamspace-entry">Teamspace-Eintrag</label>
                <select
                  id="session-teamspace-entry"
                  className="h-8 w-full rounded-lg border border-input bg-background px-2 text-sm focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-ring/50"
                  value={editSessionProjectTeamspaceEntryId}
                  onChange={(event) => setEditSessionProjectTeamspaceEntryId(event.currentTarget.value)}
                  required
                >
                  <option value="">Bitte wählen</option>
                  {projectEntries.map((entry) => (
                    <option key={entry.id} value={entry.id}>
                      {teamspaceEntryOptionLabel(entry)}
                    </option>
                  ))}
                </select>
                {teamspaceEntryDescription(selectedEditSessionTeamspaceEntry) ? (
                  <p className="text-xs text-muted-foreground">{teamspaceEntryDescription(selectedEditSessionTeamspaceEntry)}</p>
                ) : null}
              </div>
            ) : null}
            <div className="flex justify-end">
              <Button type="submit" disabled={savingSessionDetails}>
                <Save className="size-4" />
                {savingSessionDetails ? "Speichert..." : "Session speichern"}
              </Button>
            </div>
          </form>
        </DialogContent>
      </Dialog>
    </div>
  );
}