# -*- coding: utf-8 -*-
"""Plugin-Adapter fuer das Trainingsplan-Backend."""
from __future__ import annotations

import os
from pathlib import Path

from a2wsgi import WSGIMiddleware

from core.loader import load_module


def _has_plans(path: Path) -> bool:
    return any((path / "plans").glob("*.json"))


def _resolve_data_dir(default: Path) -> Path:
    for candidate in (
        Path("/home/michael/boehmitools/runtime/training/data/trainingsplan"),
        Path("/home/michael/runtime/training/data/trainingsplan"),
    ):
        if _has_plans(candidate):
            return candidate.resolve()
    if _has_plans(default):
        return default
    return default


def create_app(ctx):
    # app.py liest DATA_DIR beim Import und legt dort den ersten Plan an.
    previous = os.environ.get("DATA_DIR")
    os.environ["DATA_DIR"] = str(_resolve_data_dir(ctx.data_dir))
    try:
        module = load_module(ctx.path("app.py"), f"btp_{ctx.id}_app")
    finally:
        if previous is None:
            os.environ.pop("DATA_DIR", None)
        else:
            os.environ["DATA_DIR"] = previous

    # Flask erzeugt seine URLs anhand von SCRIPT_NAME; a2wsgi uebernimmt dafuer
    # den root_path des Mounts.
    return WSGIMiddleware(module.app)