from flask import Flask
from flask_mail import Mail
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, mail
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"""
    # import oracledb

    # oracledb.init_oracle_client(lib_dir=None) 
    app = Flask(__name__)

    # Load configuration
    app.config.from_object(Config)

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


    try:
        # 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)

    except Exception as e:
        print(f"Swagger Unexpected error occurred: {e}")


    try:
        # Error Handlers
        register_error_handlers(app)

        from . import models

        # Initialize Flask-Mail
        mail.init_app(app)

        # Database and Migrations
        db.init_app(app)

        migrate.init_app(app, db)

        return app
    except Exception as e:
        print(f"An unexpected error occurred: {e}")