__init__.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask_bcrypt import Bcrypt
from .models import User # Import User model

# Initialize extensions
db = SQLAlchemy()
bcrypt = Bcrypt()
login_manager = LoginManager()
# Assuming 'auth' will be a blueprint for authentication routes and 'login' is the login route.
login_manager.login_view = 'auth.login' 
login_manager.login_message_category = 'info' # For flash messages
migrate = Migrate()

def create_app(config_class='config.Config'):
    """
    Factory function to create the Flask application.
    """
    app = Flask(__name__)
    app.config.from_object(config_class)

    # Initialize extensions with the app
    db.init_app(app)
    bcrypt.init_app(app)
    login_manager.init_app(app)
    migrate.init_app(app, db)

    # User loader function for Flask-Login
    @login_manager.user_loader
    def load_user(user_id):
        return User.query.get(int(user_id))

    # Placeholder for blueprint registration
    from .main import main_bp # Import main blueprint
    app.register_blueprint(main_bp)

    from .auth import auth_bp # Import auth blueprint
    app.register_blueprint(auth_bp, url_prefix='/auth')
    
    # from .task_routes import task_bp # Placeholder for task routes
    # app.register_blueprint(task_bp, url_prefix='/task')

    return app