"""
Flask web dashboard application for MbetterClient
"""

import time
import logging
from pathlib import Path
from typing import Optional, Dict, Any
from flask import Flask, request, jsonify, render_template, redirect, url_for, session, g
from flask_login import LoginManager, login_required, current_user
from flask_jwt_extended import JWTManager, create_access_token, jwt_required as flask_jwt_required
from werkzeug.serving import make_server
import threading

from ..core.thread_manager import ThreadedComponent
from ..core.message_bus import MessageBus, Message, MessageType, MessageBuilder
from ..config.settings import WebConfig
from ..config.manager import ConfigManager
from ..database.manager import DatabaseManager
from .auth import AuthManager
from .api import DashboardAPI
from .routes import main_bp, auth_bp, api_bp

logger = logging.getLogger(__name__)


class WebDashboard(ThreadedComponent):
    """Flask web dashboard component"""
    
    def __init__(self, message_bus: MessageBus, db_manager: DatabaseManager, 
                 config_manager: ConfigManager, settings: WebConfig):
        super().__init__("web_dashboard", message_bus)
        self.db_manager = db_manager
        self.config_manager = config_manager
        self.settings = settings
        
        # Flask app and server
        self.app: Optional[Flask] = None
        self.server: Optional = None
        self.auth_manager: Optional[AuthManager] = None
        self.api: Optional[DashboardAPI] = None
        
        # Register message queue
        self.message_queue = self.message_bus.register_component(self.name)
        
        logger.info("WebDashboard initialized")
    
    def initialize(self) -> bool:
        """Initialize Flask application"""
        try:
            # Create Flask app
            self.app = self._create_flask_app()
            
            # Initialize auth manager
            self.auth_manager = AuthManager(self.db_manager, self.app)
            
            # Initialize API
            self.api = DashboardAPI(self.db_manager, self.config_manager, self.message_bus)
            
            # Setup routes
            self._setup_routes()
            
            # Create HTTP server
            self._create_server()
            
            # Subscribe to messages
            self.message_bus.subscribe(self.name, MessageType.CONFIG_UPDATE, self._handle_config_update)
            self.message_bus.subscribe(self.name, MessageType.SYSTEM_STATUS, self._handle_system_status)
            
            logger.info("WebDashboard initialized successfully")
            return True
            
        except Exception as e:
            logger.error(f"WebDashboard initialization failed: {e}")
            return False
    
    def _create_flask_app(self) -> Flask:
        """Create and configure Flask application"""
        # Template and static directories
        template_dir = Path(__file__).parent / 'templates'
        static_dir = Path(__file__).parent / 'static'
        
        # Create Flask app
        app = Flask(__name__,
                   template_folder=str(template_dir),
                   static_folder=str(static_dir))
        
        # Configuration
        app.config.update({
            'SECRET_KEY': self.settings.secret_key,
            'JWT_SECRET_KEY': self.settings.jwt_secret_key,
            'JWT_ACCESS_TOKEN_EXPIRES': self.settings.jwt_expiration_hours * 3600,
            'SESSION_COOKIE_HTTPONLY': True,
            'SESSION_COOKIE_SECURE': False,  # Set to True when using HTTPS
            'PERMANENT_SESSION_LIFETIME': self.settings.session_timeout_hours * 3600,
            'WTF_CSRF_ENABLED': True,
            'WTF_CSRF_TIME_LIMIT': None,
        })
        
        # Initialize extensions
        login_manager = LoginManager()
        login_manager.init_app(app)
        login_manager.login_view = 'auth.login'
        login_manager.login_message = 'Please log in to access this page.'
        
        jwt_manager = JWTManager(app)
        
        # User loader for Flask-Login
        @login_manager.user_loader
        def load_user(user_id):
            from .auth import AuthenticatedUser
            user_model = self.db_manager.get_user_by_id(int(user_id))
            if user_model:
                return AuthenticatedUser(
                    user_id=user_model.id,
                    username=user_model.username,
                    email=user_model.email,
                    is_admin=user_model.is_admin,
                    role=getattr(user_model, 'role', 'normal')
                )
            return None
        
        # JWT error handlers
        @jwt_manager.expired_token_loader
        def expired_token_callback(jwt_header, jwt_payload):
            return jsonify({'error': 'Token has expired'}), 401
        
        @jwt_manager.invalid_token_loader
        def invalid_token_callback(error):
            return jsonify({'error': 'Invalid token'}), 401
        
        @jwt_manager.unauthorized_loader
        def unauthorized_callback(error):
            return jsonify({'error': 'Authorization required'}), 401
        
        # Request context setup
        @app.before_request
        def before_request():
            g.db_manager = self.db_manager
            g.config_manager = self.config_manager
            g.message_bus = self.message_bus
            g.auth_manager = self.auth_manager
            g.api = self.api
        
        # Template context processors
        @app.context_processor
        def inject_globals():
            return {
                'app_name': 'MbetterClient',
                'app_version': '1.0.0',
                'current_time': time.time(),
            }
        
        # Error handlers
        @app.errorhandler(404)
        def not_found_error(error):
            return render_template('errors/404.html'), 404
        
        @app.errorhandler(500)
        def internal_error(error):
            return render_template('errors/500.html'), 500
        
        @app.errorhandler(403)
        def forbidden_error(error):
            return render_template('errors/403.html'), 403
        
        return app
    
    def _setup_routes(self):
        """Setup Flask routes"""
        # Pass dependencies to route modules
        main_bp.db_manager = self.db_manager
        main_bp.config_manager = self.config_manager
        main_bp.message_bus = self.message_bus
        
        auth_bp.auth_manager = self.auth_manager
        auth_bp.db_manager = self.db_manager
        
        api_bp.api = self.api
        api_bp.db_manager = self.db_manager
        api_bp.config_manager = self.config_manager
        api_bp.message_bus = self.message_bus
        
        # Register blueprints
        self.app.register_blueprint(main_bp)
        self.app.register_blueprint(auth_bp, url_prefix='/auth')
        self.app.register_blueprint(api_bp, url_prefix='/api')
    
    def _create_server(self):
        """Create HTTP server"""
        try:
            self.server = make_server(
                self.settings.host,
                self.settings.port,
                self.app,
                threaded=True
            )
            logger.info(f"HTTP server created on {self.settings.host}:{self.settings.port}")
            
        except Exception as e:
            logger.error(f"Failed to create HTTP server: {e}")
            raise
    
    def run(self):
        """Main run loop"""
        try:
            logger.info("WebDashboard thread started")
            
            # Send ready status
            ready_message = MessageBuilder.system_status(
                sender=self.name,
                status="ready",
                details={
                    "host": self.settings.host,
                    "port": self.settings.port,
                    "url": f"http://{self.settings.host}:{self.settings.port}"
                }
            )
            self.message_bus.publish(ready_message)
            
            # Start HTTP server in separate thread
            server_thread = threading.Thread(
                target=self._run_server,
                name="WebServer",
                daemon=True
            )
            server_thread.start()
            
            # Message processing loop
            while self.running:
                try:
                    # Process messages
                    message = self.message_bus.get_message(self.name, timeout=1.0)
                    if message:
                        self._process_message(message)
                    
                    # Update heartbeat
                    self.heartbeat()
                    
                    time.sleep(0.1)
                    
                except Exception as e:
                    logger.error(f"WebDashboard run loop error: {e}")
                    time.sleep(1.0)
                    
            # Wait for server thread
            if server_thread.is_alive():
                server_thread.join(timeout=5.0)
                
        except Exception as e:
            logger.error(f"WebDashboard run failed: {e}")
        finally:
            logger.info("WebDashboard thread ended")
    
    def _run_server(self):
        """Run HTTP server"""
        try:
            logger.info(f"Starting HTTP server on {self.settings.host}:{self.settings.port}")
            self.server.serve_forever()
        except Exception as e:
            if self.running:  # Only log if not shutting down
                logger.error(f"HTTP server error: {e}")
    
    def shutdown(self):
        """Shutdown web dashboard"""
        try:
            logger.info("Shutting down WebDashboard...")
            
            if self.server:
                self.server.shutdown()
            
        except Exception as e:
            logger.error(f"WebDashboard shutdown error: {e}")
    
    def _process_message(self, message: Message):
        """Process received message"""
        try:
            # Messages are handled by subscribed handlers
            pass
        except Exception as e:
            logger.error(f"Failed to process message: {e}")
    
    def _handle_config_update(self, message: Message):
        """Handle configuration update message"""
        try:
            config_section = message.data.get("config_section")
            config_data = message.data.get("config_data")
            
            logger.info(f"Configuration update received for section: {config_section}")
            
            # Update configuration through config manager
            if config_section and config_data:
                self.config_manager.update_from_web(config_data)
            
        except Exception as e:
            logger.error(f"Failed to handle config update: {e}")
    
    def _handle_system_status(self, message: Message):
        """Handle system status message"""
        try:
            status = message.data.get("status")
            sender = message.sender
            
            logger.debug(f"System status from {sender}: {status}")
            
            # Store status for web interface
            # This could be cached or stored in database for display
            
        except Exception as e:
            logger.error(f"Failed to handle system status: {e}")
    
    def get_app_context(self):
        """Get Flask application context"""
        if self.app:
            return self.app.app_context()
        return None
    
    def send_video_command(self, command: str, **kwargs) -> bool:
        """Send video command through message bus"""
        try:
            if command == "play":
                message = MessageBuilder.video_play(
                    sender=self.name,
                    file_path=kwargs.get("file_path", ""),
                    template=kwargs.get("template", "news_template"),
                    overlay_data=kwargs.get("overlay_data", {})
                )
            elif command == "pause":
                message = Message(
                    type=MessageType.VIDEO_PAUSE,
                    sender=self.name,
                    data={}
                )
            elif command == "stop":
                message = Message(
                    type=MessageType.VIDEO_STOP,
                    sender=self.name,
                    data={}
                )
            elif command == "template_change":
                message = MessageBuilder.template_change(
                    sender=self.name,
                    template_name=kwargs.get("template_name", "news_template"),
                    template_data=kwargs.get("template_data", {})
                )
            else:
                logger.error(f"Unknown video command: {command}")
                return False
            
            # Send to qt_player
            message.recipient = "qt_player"
            self.message_bus.publish(message)
            
            logger.info(f"Video command sent: {command}")
            return True
            
        except Exception as e:
            logger.error(f"Failed to send video command: {e}")
            return False
    
    def get_system_status(self) -> Dict[str, Any]:
        """Get current system status"""
        try:
            # Request status from core
            status_request = Message(
                type=MessageType.CONFIG_REQUEST,
                sender=self.name,
                recipient="core",
                data={"section": "status"}
            )
            self.message_bus.publish(status_request)
            
            # For now, return basic status
            # In a full implementation, this would wait for response or cache status
            return {
                "web_dashboard": "running",
                "host": self.settings.host,
                "port": self.settings.port,
                "timestamp": time.time()
            }
            
        except Exception as e:
            logger.error(f"Failed to get system status: {e}")
            return {"error": str(e)}


def create_app(db_manager: DatabaseManager, config_manager: ConfigManager, 
               settings: WebConfig) -> Flask:
    """Factory function to create Flask app (for testing)"""
    dashboard = WebDashboard(None, db_manager, config_manager, settings)
    dashboard.initialize()
    return dashboard.app