updated structure and app

py_app/app/__init__.py.improved

@@ -0,0 +1,76 @@
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from datetime import datetime
+import os
+
+db = SQLAlchemy()
+
+def create_app():
+    app = Flask(__name__)
+    
+    # ========================================================================
+    # CONFIGURATION - Environment-based for Docker compatibility
+    # ========================================================================
+    
+    # Secret key for session management
+    # CRITICAL: Set SECRET_KEY environment variable in production!
+    app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'your_secret_key_change_in_production')
+    
+    # Database configuration - supports both SQLite (legacy) and MariaDB (Docker)
+    database_type = os.getenv('DATABASE_TYPE', 'mariadb')  # 'sqlite' or 'mariadb'
+    
+    if database_type == 'sqlite':
+        # SQLite mode (legacy/development)
+        app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'
+        app.logger.warning('Using SQLite database - not recommended for production!')
+    else:
+        # MariaDB mode (Docker/production) - recommended
+        db_user = os.getenv('DB_USER', 'trasabilitate')
+        db_password = os.getenv('DB_PASSWORD', 'Initial01!')
+        db_host = os.getenv('DB_HOST', 'localhost')
+        db_port = os.getenv('DB_PORT', '3306')
+        db_name = os.getenv('DB_NAME', 'trasabilitate')
+        
+        # Construct MariaDB connection string
+        # Format: mysql+mariadb://user:password@host:port/database
+        app.config['SQLALCHEMY_DATABASE_URI'] = (
+            f'mysql+mariadb://{db_user}:{db_password}@{db_host}:{db_port}/{db_name}'
+        )
+        app.logger.info(f'Using MariaDB database: {db_user}@{db_host}:{db_port}/{db_name}')
+    
+    # Disable SQLAlchemy modification tracking (improves performance)
+    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+    
+    # Connection pool settings for MariaDB
+    if database_type == 'mariadb':
+        app.config['SQLALCHEMY_ENGINE_OPTIONS'] = {
+            'pool_size': int(os.getenv('DB_POOL_SIZE', '10')),
+            'pool_recycle': int(os.getenv('DB_POOL_RECYCLE', '3600')),  # Recycle connections after 1 hour
+            'pool_pre_ping': True,  # Verify connections before using
+            'max_overflow': int(os.getenv('DB_MAX_OVERFLOW', '20')),
+            'echo': os.getenv('SQLALCHEMY_ECHO', 'false').lower() == 'true'  # SQL query logging
+        }
+    
+    # Initialize SQLAlchemy with app
+    db.init_app(app)
+
+    # Register blueprints
+    from app.routes import bp as main_bp, warehouse_bp
+    app.register_blueprint(main_bp, url_prefix='/')
+    app.register_blueprint(warehouse_bp)
+
+    # Add 'now' function to Jinja2 globals for templates
+    app.jinja_env.globals['now'] = datetime.now
+
+    # Create database tables if they don't exist
+    # Note: In Docker, schema is created by setup_complete_database.py
+    # This is kept for backwards compatibility
+    with app.app_context():
+        try:
+            db.create_all()
+            app.logger.info('Database tables verified/created')
+        except Exception as e:
+            app.logger.error(f'Error creating database tables: {e}')
+            # Don't fail startup if tables already exist or schema is managed externally
+
+    return app