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
from app.extensions import db, migrate
from flask_jwt_extended import (
    JWTManager,
    jwt_required,
    create_access_token,
    get_jwt_identity,
)


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

    # Load configuration
    app.config.from_object(Config)

    CORS(app)

    JWTManager(app)
    CORS(app, supports_credentials=True) 

    # 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)

    from . import models

    # Database and Migrations
    db.init_app(app)

    migrate.init_app(app, db)

    return app