from flask import Flask
from flask_login import LoginManager
import os
import json

from .models import initialize_db, User
from .utils.auth import ensure_default_admin, ensure_test_users

login_manager = LoginManager()


def create_app():
    app = Flask(__name__)
    app.secret_key = os.environ.get('FLASK_SECRET', 'sk_f098a9f7206d40f89bc2a0dd1d2d9182')
    app.jinja_env.filters['from_json'] = json.loads

    # DB init and seeds
    initialize_db()
    if os.environ.get('SEED_ADMIN_DISABLED') != '1':
        ensure_default_admin()
    if os.environ.get('SEED_TEST_USERS_DISABLED') != '1':
        ensure_test_users()

    # Login manager
    login_manager.init_app(app)
    login_manager.login_view = 'auth.login'

    @login_manager.user_loader
    def load_user(user_id):
        try:
            return User.get_by_id(int(user_id))
        except Exception:
            return None

    # Register blueprints
    from .blueprints.auth import bp as auth_bp
    from .blueprints.admin_users import bp as admin_users_bp
    from .blueprints.core import bp as core_bp
    from .blueprints.invite import bp as invite_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(core_bp)
    app.register_blueprint(invite_bp)
    app.register_blueprint(admin_users_bp)

    return app