from flask import Flask

def create_app():
    app = Flask(__name__)

    # Tenant subdomain resolver (before every request)
    from middleware_tenant import resolve_tenant
    app.before_request(resolve_tenant)

    # ─── PWA: Service Worker must be served from /pos/ scope ──────
    @app.route('/pos/sw.js')
    def pos_sw():
        from flask import send_from_directory
        return send_from_directory('static/pwa', 'sw.js',
                                   mimetype='application/javascript')

    # Register blueprints
    from blueprints.auth_bp import auth_bp
    app.register_blueprint(auth_bp)

    from blueprints.config_bp import config_bp
    app.register_blueprint(config_bp)

    from blueprints.inventory_bp import inventory_bp
    app.register_blueprint(inventory_bp)

    from blueprints.catalog_bp import catalog_bp
    app.register_blueprint(catalog_bp)

    from blueprints.pos_bp import pos_bp
    app.register_blueprint(pos_bp)

    from blueprints.customers_bp import customers_bp
    app.register_blueprint(customers_bp)

    from blueprints.cashregister_bp import cashregister_bp
    app.register_blueprint(cashregister_bp)

    from blueprints.invoicing_bp import invoicing_bp
    app.register_blueprint(invoicing_bp)

    from blueprints.accounting_bp import accounting_bp
    app.register_blueprint(accounting_bp)

    from blueprints.chat_bp import chat_bp
    app.register_blueprint(chat_bp)

    # Health check
    @app.route('/pos/health')
    def health():
        return {'status': 'ok'}

    from flask import render_template, send_from_directory, jsonify, g

    @app.route('/favicon.ico')
    def favicon():
        return send_from_directory('static/pwa', 'icon-192.png', mimetype='image/png')

    @app.route('/pos/login')
    def pos_login():
        return render_template('login.html',
                               tenant_id=getattr(g, 'tenant_id', None),
                               tenant_name=getattr(g, 'tenant_name', None),
                               tenant_subdomain=getattr(g, 'tenant_subdomain', None))

    @app.route('/pos/catalog')
    def pos_catalog():
        return render_template('catalog.html')

    @app.route('/pos/inventory')
    def pos_inventory():
        return render_template('inventory.html')

    @app.route('/pos/sale')
    def pos_sale():
        return render_template('pos.html')

    @app.route('/pos/customers')
    def pos_customers():
        return render_template('customers.html')

    @app.route('/pos/invoicing')
    def pos_invoicing():
        return render_template('invoicing.html')

    @app.route('/pos/accounting')
    def pos_accounting():
        return render_template('accounting.html')

    @app.route('/pos/dashboard')
    def pos_dashboard():
        return render_template('dashboard.html')

    @app.route('/pos/config')
    def pos_config():
        return render_template('config.html')

    @app.route('/pos/reports')
    def pos_reports():
        return render_template('reports.html')

    @app.route('/pos/static/<path:filename>')
    def pos_static(filename):
        return send_from_directory('static', filename)

    # ─── Sync: full inventory for offline cache ───────────────────
    from middleware import require_auth as _require_auth

    @app.route('/pos/api/sync/inventory', methods=['GET'])
    @_require_auth()
    def sync_full_inventory():
        """Download full inventory for offline cache."""
        from tenant_db import get_tenant_conn
        conn = get_tenant_conn(g.tenant_id)
        cur = conn.cursor()
        branch_id = g.branch_id

        cur.execute("""
            SELECT i.id, i.part_number, i.barcode, i.name, i.brand,
                   i.unit, i.price_1, i.price_2, i.price_3, i.tax_rate,
                   COALESCE(s.stock, 0) AS stock
            FROM inventory i
            LEFT JOIN (
                SELECT inventory_id, COALESCE(SUM(quantity), 0) AS stock
                FROM inventory_operations GROUP BY inventory_id
            ) s ON s.inventory_id = i.id
            WHERE i.is_active = true AND i.branch_id = %s
            ORDER BY i.name
        """, [branch_id])

        items = []
        for r in cur.fetchall():
            items.append({
                'item_id': r[0], 'sku': r[1], 'barcode': r[2],
                'name': r[3], 'brand': r[4], 'unit': r[5],
                'price_1': float(r[6]) if r[6] else 0,
                'price_2': float(r[7]) if r[7] else 0,
                'price_3': float(r[8]) if r[8] else 0,
                'tax_rate': float(r[9]) if r[9] else 0.16,
                'stock': r[10]
            })
        cur.close()
        conn.close()
        return jsonify({'items': items, 'count': len(items)})

    return app

if __name__ == '__main__':
    app = create_app()
    app.run(host='0.0.0.0', port=5001, debug=True)