"""Flask application factory."""

import os
from datetime import UTC, datetime

from flask import Flask, g
from flask_cors import CORS


def create_app(config_name: str | None = None) -> Flask:
    """Create Flask application."""
    from customer_portal.config import config

    app = Flask(__name__)

    # Load config
    config_name = config_name or os.getenv("FLASK_ENV", "default")
    app.config.from_object(config[config_name])

    # Extensions
    CORS(app)

    # Initialize Flask-Mail
    from customer_portal.services.email import mail

    mail.init_app(app)

    # Initialize database
    from customer_portal.models import close_db, create_tables, init_db

    init_db(app.config["SQLALCHEMY_DATABASE_URI"])

    # Create tables on first request (development)
    with app.app_context():
        create_tables()

    # Teardown - close db session
    app.teardown_appcontext(close_db)

    # Register Jinja2 filters
    from customer_portal.web.filters import register_filters

    register_filters(app)

    # Context processor for templates
    @app.context_processor
    def inject_globals():
        from customer_portal.models import get_db
        from customer_portal.models.settings import (
            DEFAULT_BRANDING_CONFIG,
            PortalSettings,
        )

        # Get branding config (with fallback to defaults)
        branding = DEFAULT_BRANDING_CONFIG.copy()
        try:
            db = get_db()
            branding = PortalSettings.get_branding(db)
        except Exception:
            pass  # Use defaults if DB not available

        return {
            "now": lambda: datetime.now(UTC),
            "branding": branding,
        }

    # Make g.customer available in templates
    @app.before_request
    def load_customer():
        g.customer = None

    # Blueprints
    from customer_portal.web.routes import (
        admin,
        api,
        auth,
        bookings,
        invoices,
        main,
        profile,
        videos,
    )

    app.register_blueprint(main.bp)
    app.register_blueprint(auth.bp, url_prefix="/auth")
    app.register_blueprint(api.bp, url_prefix="/api")
    app.register_blueprint(admin.bp, url_prefix="/admin")
    app.register_blueprint(bookings.bp, url_prefix="/bookings")
    app.register_blueprint(invoices.bp, url_prefix="/invoices")
    app.register_blueprint(profile.bp, url_prefix="/profile")
    app.register_blueprint(videos.bp, url_prefix="/videos")

    return app