from flask import Flask
from flask_mail import Mail
from flask_cors import CORS
from app.config import Config
from app.routes import auth_bp, autocall_bp
from app.response import (method_not_allowed, unsupported_media_type, not_found, bad_request)
from app.extensions import db, mail


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

    # Load configuration
    app.config.from_object(Config)

    # Setup CORS
    CORS(app)
    
    # Initialize Flask-Mail
    mail.init_app(app)

    # Register blueprints
    app.register_blueprint(auth_bp)
    app.register_blueprint(autocall_bp, url_prefix="/autocall")

    # Error Handlers
    app.register_error_handler(405, method_not_allowed)
    app.register_error_handler(415, unsupported_media_type)
    app.register_error_handler(404, not_found)
    app.register_error_handler(400, bad_request)

    # Database
    db.init_app(app)

    return app