from __future__ import annotations

import json
from pathlib import Path

from flask import Flask


def _load_secret_key(project_root: Path) -> str:
    conf_path = project_root / "frontend" / "data" / "conf.json"
    if conf_path.exists():
        try:
            conf = json.loads(conf_path.read_text(encoding="utf-8"))
            key = conf.get("secret_key", "")
            if key:
                return str(key)
        except Exception:
            pass
    return "pysonnerie-frontend-dev-key"


def create_app() -> Flask:
    app = Flask(__name__)

    project_root = Path(__file__).resolve().parents[2]
    secret = _load_secret_key(project_root)
    app.config["SECRET_KEY"] = secret

    app.config["PROJECT_ROOT"] = project_root
    app.config["MUSIC_DIR"] = project_root / "backend" / "data" / "musiques"
    app.config["MAX_CONTENT_LENGTH"] = 128 * 1024 * 1024

    from .routes import ui

    app.register_blueprint(ui)
    return app