from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from flask_cors import CORS
import os
from dotenv import load_dotenv

# Lade Umgebungsvariablen
load_dotenv()

db = SQLAlchemy()
login_manager = LoginManager()

def create_app():
    app = Flask(__name__)
    
    # Konfiguration
    app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY') or 'dev-secret-key'
    app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('DATABASE_URL') or 'sqlite:///querybuilder.db'
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
    
    # Initialisiere Extensions
    db.init_app(app)
    login_manager.init_app(app)
    login_manager.login_view = 'auth.login'
    login_manager.login_message = 'Bitte melden Sie sich an, um auf diese Seite zuzugreifen.'
    
    CORS(app)
    
    # Registriere Blueprints
    from app.routes.auth import auth_bp
    from app.routes.main import main_bp
    from app.routes.api import api_bp
    from app.routes.admin import admin_bp
    
    app.register_blueprint(auth_bp, url_prefix='/auth')
    app.register_blueprint(main_bp)
    app.register_blueprint(api_bp, url_prefix='/api')
    app.register_blueprint(admin_bp, url_prefix='/admin')
    
    # Erstelle Datenbanktabellen
    with app.app_context():
        db.create_all()
        
        # Erstelle Standard-Admin-User falls nicht vorhanden
        from app.models import User
        admin = User.query.filter_by(username='admin').first()
        if not admin:
            admin = User(username='admin', email='admin@example.com', is_admin=True)
            admin.set_password('admin123')
            db.session.add(admin)
            db.session.commit()
    
    return app

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