import type { TicketTodo } from "./types";

function parseDateOnly(value: string) {
  const [year, month, day] = value.split("-").map(Number);
  return new Date(year, month - 1, day);
}

export function formatDateOnly(date: Date) {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, "0");
  const day = String(date.getDate()).padStart(2, "0");

  return `${year}-${month}-${day}`;
}

export function formatTodoDate(value: string) {
  return new Intl.DateTimeFormat("de-DE", {
    day: "2-digit",
    month: "2-digit",
    year: "numeric"
  }).format(parseDateOnly(value));
}

export function formatTodoPeriod(todo: Pick<TicketTodo, "starts_on" | "ends_on">) {
  if (!todo.starts_on && !todo.ends_on) {
    return null;
  }

  if (todo.starts_on && todo.ends_on && todo.starts_on === todo.ends_on) {
    return `am ${formatTodoDate(todo.starts_on)}`;
  }

  if (todo.starts_on && todo.ends_on) {
    return `${formatTodoDate(todo.starts_on)} - ${formatTodoDate(todo.ends_on)}`;
  }

  if (todo.starts_on) {
    return `ab ${formatTodoDate(todo.starts_on)}`;
  }

  return `bis ${formatTodoDate(todo.ends_on!)}`;
}

export function isTodoActiveOnDay(todo: Pick<TicketTodo, "starts_on" | "ends_on" | "status">, day: string) {
  if (todo.status !== "open") {
    return false;
  }

  if (!todo.starts_on && !todo.ends_on) {
    return false;
  }

  return (!todo.starts_on || todo.starts_on <= day) && (!todo.ends_on || todo.ends_on >= day);
}

export function isTodoFixedOnDay(todo: Pick<TicketTodo, "starts_on" | "ends_on" | "status">, day: string) {
  return todo.status === "open" && todo.starts_on === day && todo.ends_on === day;
}

export function isTodoOverdue(todo: Pick<TicketTodo, "ends_on" | "status">, today: string) {
  return todo.status === "open" && Boolean(todo.ends_on) && todo.ends_on! < today;
}