Create app/init.py

app/init.py

@@ -0,0 +1,76 @@
+"""
+Flask OpenAI Chat Application
+Modern Flask app with proper structure and error handling
+"""
+import os
+import logging
+from flask import Flask
+from flask_cors import CORS
+from dotenv import load_dotenv
+
+def create_app():
+    """Application factory pattern"""
+    # Load environment variables
+    load_dotenv()
+    
+    app = Flask(__name__)
+    
+    # Configuration
+    app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')
+    app.config['OPENAI_API_KEY'] = os.getenv('OPENAI_API_KEY')
+    
+    # Validate required environment variables
+    if not app.config['OPENAI_API_KEY']:
+        raise ValueError("❌ OPENAI_API_KEY is not set. Please add it to your .env file.")
+    
+    # Enable CORS for all routes
+    CORS(app, origins=["*"])  # In production, specify allowed origins
+    
+    # Setup logging
+    setup_logging(app)
+    
+    # Register blueprints
+    from app.routes.chat import chat_bp
+    from app.routes.health import health_bp
+    
+    app.register_blueprint(chat_bp)
+    app.register_blueprint(health_bp)
+    
+    # Error handlers
+    register_error_handlers(app)
+    
+    return app
+
+def setup_logging(app):
+    """Configure application logging"""
+    if not app.debug:
+        # Production logging
+        if not os.path.exists('logs'):
+            os.mkdir('logs')
+        
+        file_handler = logging.handlers.RotatingFileHandler(
+            'logs/app.log', maxBytes=10240, backupCount=10
+        )
+        file_handler.setFormatter(logging.Formatter(
+            '%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]'
+        ))
+        file_handler.setLevel(logging.INFO)
+        app.logger.addHandler(file_handler)
+        app.logger.setLevel(logging.INFO)
+        app.logger.info('Flask OpenAI Chat startup')
+
+def register_error_handlers(app):
+    """Register global error handlers"""
+    
+    @app.errorhandler(400)
+    def bad_request(error):
+        return {'error': 'Bad request', 'message': str(error)}, 400
+    
+    @app.errorhandler(404)
+    def not_found(error):
+        return {'error': 'Not found', 'message': 'The requested resource was not found'}, 404
+    
+    @app.errorhandler(500)
+    def internal_error(error):
+        app.logger.error(f'Server Error: {error}')
+        return {'error': 'Internal server error', 'message': 'Something went wrong'}, 500