"""Application factory."""
from flask import Flask, render_template
from app.config import get_config
from app.extensions import (db, migrate, login_manager, csrf, babel, limiter)


def create_app(config_object=None):
    app = Flask(__name__)
    app.config.from_object(config_object or get_config())

    _init_extensions(app)
    _init_login(app)
    _init_babel(app)
    _register_blueprints(app)
    _register_errorhandlers(app)
    _register_context(app)
    _register_cli(app)

    return app


def _init_extensions(app):
    # Honor X-Forwarded-* from the Nginx reverse proxy (scheme, host, client IP).
    # Correct is_secure, secure cookies, and rate-limit keying behind the proxy.
    from werkzeug.middleware.proxy_fix import ProxyFix
    app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1)

    db.init_app(app)
    migrate.init_app(app, db)
    csrf.init_app(app)
    limiter.init_app(app)
    # ensure models are imported so migrations see them
    from app import models  # noqa: F401


def _init_login(app):
    login_manager.init_app(app)

    @login_manager.user_loader
    def load_user(user_id):
        from app.models.user import User
        return User.query.get(int(user_id))


def _init_babel(app):
    from app.blueprints.i18n.routes import select_locale
    babel.init_app(app, locale_selector=select_locale)


def _register_blueprints(app):
    from app.blueprints.main.routes import main_bp
    from app.blueprints.auth.routes import auth_bp
    from app.blueprints.i18n.routes import i18n_bp
    from app.blueprints.listings.routes import listings_bp
    from app.blueprints.messaging.routes import messaging_bp
    from app.blueprints.payments.routes import payments_bp
    from app.blueprints.ads.routes import ads_bp
    from app.blueprints.admin.routes import admin_bp
    app.register_blueprint(main_bp)
    app.register_blueprint(auth_bp)
    app.register_blueprint(i18n_bp)
    app.register_blueprint(listings_bp)
    app.register_blueprint(messaging_bp)
    app.register_blueprint(payments_bp)
    app.register_blueprint(ads_bp)
    app.register_blueprint(admin_bp)


def _register_errorhandlers(app):
    @app.errorhandler(403)
    def forbidden(e):
        return render_template("errors/403.html"), 403

    @app.errorhandler(404)
    def not_found(e):
        return render_template("errors/404.html"), 404

    @app.errorhandler(500)
    def server_error(e):
        return render_template("errors/500.html"), 500


def _register_context(app):
    from flask_babel import get_locale
    from flask import request
    from flask_login import current_user
    from app.blueprints.ads.routes import inject_ads

    def merge_query(**overrides):
        merged = request.args.to_dict()
        merged.update({k: v for k, v in overrides.items() if v is not None})
        return merged

    @app.context_processor
    def inject_globals():
        unread = 0
        if current_user.is_authenticated:
            try:
                from app.services.messaging import total_unread
                unread = total_unread(current_user)
            except Exception:
                pass
        ad_context = {}
        try:
            ad_context = inject_ads()
        except Exception:
            pass
        return {
            "get_locale": get_locale,
            "merge_query": merge_query,
            "SUPPORTED_LOCALES": app.config["SUPPORTED_LOCALES"],
            "TURNSTILE_SITE_KEY": app.config.get("TURNSTILE_SITE_KEY", ""),
            "unread_count": unread,
            **ad_context,
        }


def _register_cli(app):
    @app.cli.command("expire-listings")
    def expire_listings_cmd():
        """Sweep: flip past-due active listings to expired."""
        from app.services.listings import expire_due_listings
        n = expire_due_listings()
        print(f"Expired {n} listing(s).")

    @app.cli.command("expire-boosts")
    def expire_boosts_cmd():
        """Sweep: clear expired boosts, revert listing effects."""
        from app.services.billing import expire_boosts
        n = expire_boosts()
        print(f"Cleared {n} expired boost(s).")

    @app.cli.command("expire-promoted-keywords")
    def expire_promoted_cmd():
        """Sweep: remove expired promoted keyword rows."""
        from app.services.ads import expire_promoted_keywords
        n = expire_promoted_keywords()
        print(f"Removed {n} expired promoted keyword(s).")

    @app.cli.command("reconcile-subscriptions")
    def reconcile_cmd():
        """Nightly: sync local subscription status vs Stripe."""
        from app.services.billing import reconcile_subscriptions
        checked, fixed = reconcile_subscriptions()
        print(f"Reconciled {checked} subscription(s), fixed {fixed}.")