from __future__ import annotations

import logging
import os
from logging.handlers import RotatingFileHandler

from flask import Flask
from flask_compress import Compress
from flask_cors import CORS

from config import Config
from models import db
from routes import admin_bp, bp
from sockets import socketio


def create_app() -> Flask:
    app = Flask(__name__, template_folder=os.path.join(os.path.dirname(__file__), "..", "templates"), static_folder=os.path.join(os.path.dirname(__file__), "..", "static"))
    app.config.from_object(Config)

    os.makedirs(app.config["MEDIA_DIR"], exist_ok=True)

    # Extensions
    db.init_app(app)
    CORS(app, resources={r"/*": {"origins": app.config.get("CORS_ORIGINS", "*")}})
    Compress(app)

    # SocketIO tuning from config
    socketio.init_app(
        app,
        cors_allowed_origins=app.config.get("CORS_ORIGINS", "*"),
        ping_interval=app.config["SOCKETIO_PING_INTERVAL"],
        ping_timeout=app.config["SOCKETIO_PING_TIMEOUT"],
    )

    # Blueprints
    app.register_blueprint(bp)
    app.register_blueprint(admin_bp)

    # Logging
    _configure_logging(app)

    @app.after_request
    def _lan_headers(resp):
        # Keep headers permissive for embedded Chromium/Tizen/WebOS.
        resp.headers.pop("Content-Security-Policy", None)
        resp.headers.pop("Cross-Origin-Opener-Policy", None)
        resp.headers.pop("Cross-Origin-Embedder-Policy", None)
        # Disable caching for HTML/JS (but media route sets its own cache-control)
        if resp.mimetype in ("text/html", "application/javascript"):
            resp.headers["Cache-Control"] = "no-store"
        return resp

    return app


def _configure_logging(app: Flask) -> None:
    log_dir = app.config.get("LOG_DIR") or os.path.abspath(os.path.join(app.root_path, "..", "logs"))
    os.makedirs(log_dir, exist_ok=True)
    log_path = os.path.abspath(os.path.join(log_dir, "system.log"))
    handler = RotatingFileHandler(log_path, maxBytes=2_000_000, backupCount=3)
    fmt = logging.Formatter("%(asctime)s %(levelname)s %(name)s: %(message)s")
    handler.setFormatter(fmt)
    handler.setLevel(logging.INFO)
    app.logger.addHandler(handler)
    logging.getLogger().addHandler(handler)
    logging.getLogger().setLevel(logging.INFO)