# -*- coding: utf-8 -*-
"""Plugin-Adapter fuer die schlanke mobile Trainingsansicht."""
from __future__ import annotations

import os
from pathlib import Path

from a2wsgi import WSGIMiddleware
from core.loader import load_module


def create_app(ctx):
    """Haengt die Flask-App unter /plugins/trainingstracker ein."""
    tracker_data_dir = Path(ctx.data_dir)
    plans_dir = tracker_data_dir.parent / "trainingsplan" / "plans"

    previous_data = os.environ.get("TRAININGSTRACKER_DATA_DIR")
    previous_plans = os.environ.get("TRAININGSTRACKER_PLANS_DIR")
    os.environ["TRAININGSTRACKER_DATA_DIR"] = str(tracker_data_dir)
    os.environ["TRAININGSTRACKER_PLANS_DIR"] = str(plans_dir)
    try:
        module = load_module(ctx.path("app.py"), f"btp_{ctx.id}_app")
    finally:
        if previous_data is None:
            os.environ.pop("TRAININGSTRACKER_DATA_DIR", None)
        else:
            os.environ["TRAININGSTRACKER_DATA_DIR"] = previous_data
        if previous_plans is None:
            os.environ.pop("TRAININGSTRACKER_PLANS_DIR", None)
        else:
            os.environ["TRAININGSTRACKER_PLANS_DIR"] = previous_plans

    return WSGIMiddleware(module.app)