from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager
from flask_migrate import Migrate
from flask_cors import CORS
from dotenv import load_dotenv
from config.config import Config

import os

load_dotenv()

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

def create_app():
    app = Flask(__name__)
    
    # Configuration
    app.config.from_object(Config)
    
    # Initialize extensions
    db.init_app(app)
    login_manager.init_app(app)
    migrate.init_app(app, db)
    CORS(app)
    
    # Login manager configuration
    login_manager.login_view = 'auth.login'
    login_manager.login_message = 'Please log in to access this page.'
    
    @login_manager.user_loader
    def load_user(user_id):
        from app.models.user import User
        return User.query.get(int(user_id))
    
    # Register blueprints
    from app.routes.auth import auth_bp
    from app.routes.main import main_bp
    from app.routes.classrooms import classrooms_bp
    from app.routes.schedule import schedule_bp
    
    app.register_blueprint(auth_bp)
    app.register_blueprint(main_bp)
    app.register_blueprint(classrooms_bp, url_prefix='/classrooms')
    app.register_blueprint(schedule_bp, url_prefix='/schedule')
    
    # Create database tables
    with app.app_context():
        db.create_all()
        
        # Create default admin user if not exists
        from app.models.user import User
        if not User.query.filter_by(email='admin@edu-space.com').first():
            admin = User(
                email='admin@edu-space.com',
                name='System Administrator',
                role='admin'
            )
            admin.set_password('admin123')  # Change this in production
            db.session.add(admin)
            db.session.commit()
    
    return app