from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager

db = SQLAlchemy()
migrate = Migrate()
login_manager = LoginManager()


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

    # Initialize core extensions
    db.init_app(app)
    migrate.init_app(app, db)
    login_manager.init_app(app)
    login_manager.login_view = 'auth.login'  # Optional: redirect for @login_required

    # Register Blueprints
    from .core.routes import core
    from .core.auth import auth
    app.register_blueprint(core)
    app.register_blueprint(auth, url_prefix="/auth")

    # Register CLI commands
    from .cli import seed_admin
    app.cli.add_command(seed_admin)

    return app


@login_manager.user_loader
def load_user(user_id):
    from .core.models import User
    return User.query.get(int(user_id))