from flask import Flask
import os
from flask_swagger_ui import get_swaggerui_blueprint
from flask_cors import CORS
from app.config import Config
from app.api.routes import api
from app.errors import register_error_handlers
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()
migrate = Migrate()

def create_app():
    """ Factory function to create a Flask app instance """
    app = Flask(__name__)

    # Load configuration
    app.config.from_object(Config)


    CORS(app) 

    # Swagger Doc
    SWAGGER_URL = app.config.get("SWAGGER_URL")
    API_URL = app.config.get("API_URL")

    
    # Register blueprints
    app.register_blueprint(api)

    swagger_ui_blueprint = get_swaggerui_blueprint(SWAGGER_URL, API_URL)
    app.register_blueprint(swagger_ui_blueprint, url_prefix=SWAGGER_URL)

   
    # Error Handlers
    register_error_handlers(app)

    import logging
    from sqlalchemy import create_engine

    # Set up logging
    logging.basicConfig(level=logging.INFO)
    logger = logging.getLogger(__name__)

    # Log the database URI
    logger.info(f"Database URI: {app.config['SQLALCHEMY_DATABASE_URI']}")

    # Database and Migrations
    db.init_app(app)
    
    
    migrate.init_app(app, db)
   

    return app