LunchDeals/backend/app/__init__.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from authlib.integrations.flask_client import OAuth
from config import config

db = SQLAlchemy()
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
oauth = OAuth()

def create_app(config_name='default'):
    app = Flask(__name__)
    app.config.from_object(config[config_name])

    db.init_app(app)
    login_manager.init_app(app)
    oauth.init_app(app)

    # Register blueprints here
    from app.main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    from app.auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint, url_prefix='/auth')

    from app.admin import admin as admin_blueprint
    app.register_blueprint(admin_blueprint, url_prefix='/admin')

    return app