app/__init__.py

import os
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from flask_migrate import Migrate
from flask_mail import Mail
from config import Config

# Initialize extensions
db = SQLAlchemy()
migrate = Migrate()
login = LoginManager()
login.login_view = 'auth.login' # Redirect to login page if user is not authenticated
login.login_message = 'Please log in to access this page.'
mail = Mail()

def create_app(config_class=Config):
    app = Flask(__name__)
    app.config.from_object(config_class)

    # Make sure these folders exist
    os.makedirs('temp_uploads', exist_ok=True)
    os.makedirs('spectrograms/temp', exist_ok=True)

    db.init_app(app)
    migrate.init_app(app, db)
    login.init_app(app)
    mail.init_app(app)

    # Register Blueprints
    from app.auth import bp as auth_bp
    app.register_blueprint(auth_bp, url_prefix='/auth')

    from app.routes import bp as main_bp
    app.register_blueprint(main_bp)

    with app.app_context():
        db.create_all() # Create tables for our models

    return app