from __future__ import annotations

import os
import secrets
from datetime import date, timedelta
from pathlib import Path

from flask import Flask, send_from_directory

from . import db
from .auth import auth_bp
from .constants import CATEGORIES, DAYPARTS, ITEM_KIND_LABELS, ITEM_KIND_SINGULAR_LABELS
from .main import main_bp


WEEKDAY_NAMES = ["Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag", "Sonntag"]
WEEKDAY_SHORT_NAMES = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"]


def create_app() -> Flask:
    root_dir = Path(__file__).resolve().parent.parent
    data_dir = Path(os.environ.get("NOURI_DATA_DIR", root_dir / "data")).resolve()
    upload_dir = data_dir / "uploads"
    db_path = data_dir / "nouri.sqlite3"

    data_dir.mkdir(parents=True, exist_ok=True)
    upload_dir.mkdir(parents=True, exist_ok=True)

    app = Flask(__name__, instance_relative_config=False)
    app.config.update(
        SECRET_KEY=os.environ.get("NOURI_SECRET_KEY", secrets.token_hex(24)),
        DATABASE_PATH=str(db_path),
        DATA_DIR=str(data_dir),
        UPLOAD_FOLDER=str(upload_dir),
        MAX_CONTENT_LENGTH=int(os.environ.get("NOURI_MAX_UPLOAD_MB", "5")) * 1024 * 1024,
        PERMANENT_SESSION_LIFETIME=timedelta(days=30),
    )

    db.init_app(app)
    db.init_db_if_needed(app)

    app.register_blueprint(auth_bp)
    app.register_blueprint(main_bp)

    @app.context_processor
    def inject_globals() -> dict[str, object]:
        return {
            "item_kind_labels": ITEM_KIND_LABELS,
            "item_kind_singular_labels": ITEM_KIND_SINGULAR_LABELS,
            "category_suggestions": CATEGORIES,
            "daypart_suggestions": DAYPARTS,
            "today": date.today(),
            "weekday_name": lambda value: WEEKDAY_NAMES[value.weekday()],
            "weekday_short_name": lambda value: WEEKDAY_SHORT_NAMES[value.weekday()],
        }

    @app.get("/uploads/<path:filename>")
    def uploaded_file(filename: str):
        return send_from_directory(app.config["UPLOAD_FOLDER"], filename)

    return app