"""TieMeasureFlow Client - Flask Entry Point."""
import os

from flask import Flask, redirect, url_for, session, request
from flask_babel import Babel

from config import Config


def get_locale():
    """Get user's preferred language from session or Accept-Language header."""
    # 1. User preference in session
    if "language" in session:
        return session["language"]
    # 2. Browser Accept-Language
    return request.accept_languages.best_match(
        Config.LANGUAGES.keys(), default="it"
    )


def create_app() -> Flask:
    """Application factory."""
    app = Flask(__name__)
    app.config.from_object(Config)

    # Initialize Flask-Babel
    Babel(app, locale_selector=get_locale)

    # Register blueprints
    from blueprints.auth import auth_bp
    from blueprints.measure import measure_bp
    from blueprints.maker import maker_bp
    from blueprints.statistics import statistics_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(measure_bp, url_prefix="/measure")
    app.register_blueprint(maker_bp, url_prefix="/maker")
    app.register_blueprint(statistics_bp, url_prefix="/statistics")

    @app.route("/")
    def index():
        """Root redirect to login or dashboard based on session."""
        if "user" in session:
            return redirect(url_for("measure.select_recipe"))
        return redirect(url_for("auth.login"))

    @app.context_processor
    def inject_globals():
        """Inject global variables into all templates."""
        return {
            "current_user": session.get("user"),
            "current_theme": session.get("theme", "light"),
            "current_language": get_locale(),
            "languages": Config.LANGUAGES,
        }

    return app


if __name__ == "__main__":
    app = create_app()
    app.run(
        host=os.getenv("CLIENT_HOST", "0.0.0.0"),
        port=int(os.getenv("CLIENT_PORT", "5000")),
        debug=True,
    )