"""
SKE Digital Signage Server Application Factory
"""

import os
from flask import Flask
from flask_migrate import Migrate

def create_app(config_name=None):
    """Application factory function"""
    
    # Create Flask application
    app = Flask(__name__, instance_relative_config=True)
    
    # Load configuration
    if config_name is None:
        config_name = os.environ.get('FLASK_CONFIG', 'default')
    
    from config import config
    app.config.from_object(config[config_name])
    
    # Ensure instance folder exists
    os.makedirs(app.instance_path, exist_ok=True)
    
    # Initialize extensions
    from app.extensions import db, bcrypt, login_manager
    
    db.init_app(app)
    bcrypt.init_app(app)
    login_manager.init_app(app)
    login_manager.login_view = 'auth.login'
    login_manager.login_message = 'Please log in to access this page.'
    
    # Initialize Flask-Migrate
    migrate = Migrate(app, db)
    
    # Register user loader for Flask-Login
    from app.models.user import User
    
    @login_manager.user_loader
    def load_user(user_id):
        return db.session.get(User, int(user_id))
    
    # Register blueprints
    from app.routes.auth import bp as auth_bp
    from app.routes.dashboard import bp as dashboard_bp
    from app.routes.admin import bp as admin_bp
    from app.routes.player import bp as player_bp
    from app.routes.group import bp as group_bp
    from app.routes.content import bp as content_bp
    from app.routes.api import bp as api_bp
    
    app.register_blueprint(auth_bp, url_prefix='/auth')
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(admin_bp, url_prefix='/admin')
    app.register_blueprint(player_bp, url_prefix='/player')
    app.register_blueprint(group_bp, url_prefix='/group')
    app.register_blueprint(content_bp, url_prefix='/content')
    app.register_blueprint(api_bp, url_prefix='/api')
    
    # Create upload folders
    upload_path = os.path.join(app.static_folder, 'uploads')
    assets_path = os.path.join(app.static_folder, 'assets')
    os.makedirs(upload_path, exist_ok=True)
    os.makedirs(assets_path, exist_ok=True)
    
    # Context processor for theme injection
    @app.context_processor
    def inject_theme():
        from flask_login import current_user
        if current_user.is_authenticated:
            theme = getattr(current_user, 'theme', 'light')
        else:
            theme = 'light'
        return dict(theme=theme)
    
    # Context processor for server info
    @app.context_processor
    def inject_server_info():
        return dict(
            server_version=app.config['SERVER_VERSION'],
            build_date=app.config['BUILD_DATE']
        )
    
    return app