#!/usr/bin/python3

import os
import sys
import signal
import threading
import logging
from http.server import HTTPServer
from multiprocessing import Queue

# Import our custom modules
from alarm_api import AlertApi, run as run_api
from alarm_storage import AlarmStorage
from alarm_siren import AlarmSiren
from ncurses_ui import UI
from logging_config import setup_logging

# Set up logging
logger = setup_logging()

class AlarmSystemManager:
    def __init__(self,
                 api_port: int = 8000,
                 storage_path: str = "data/alerts.json",
                 log_level: int = logging.DEBUG):
        """
        Initialize and manage the entire alarm system

        Args:
            api_port (int): Port for the HTTP API server
            storage_path (str): Path to the JSON storage file
            log_level (int): Logging level
        """
        # Configure logging
        logging.getLogger().setLevel(log_level)

        # Ensure storage directory exists
        os.makedirs(os.path.dirname(os.path.abspath(storage_path)), exist_ok=True)

        # Initialize components
        self.siren = AlarmSiren()
        self.storage = AlarmStorage(storage_path, siren=self.siren)

        # API server setup
        self.api_port = api_port
        self.api_server = None
        self.api_thread = None

        # Synchronization and lifecycle management
        self.stop_event = threading.Event()

        # Signal handling setup
        self._setup_signal_handlers()

        # Alarm synchronization
        self._sync_alarms()

        # UI..
        self.ui = UI(self)

    def _setup_signal_handlers(self):
        """Set up signal handlers for graceful shutdown"""
        signal.signal(signal.SIGINT, self._handle_shutdown)
        signal.signal(signal.SIGTERM, self._handle_shutdown)

    def _handle_shutdown(self, signum, frame):
        """
        Handle system shutdown signals

        Args:
            signum (int): Signal number
            frame (frame): Current stack frame
        """
        logger.info(f"Received shutdown signal {signum}. Initiating graceful shutdown...")
        self.stop_event.set()

    def _sync_alarms(self):
        """
        Synchronize stored alarms with the siren
        This ensures any saved alarms are loaded and scheduled
        """
        try:
            saved_alarms = self.storage.get_saved_alerts()
            logger.info(f"Synchronizing {len(saved_alarms)} saved alarms")

            for alarm in saved_alarms:
                if alarm.get('enabled', True):
                    self.siren.schedule_alarm(alarm)
        except Exception as e:
            logger.error(f"Error synchronizing alarms: {e}")

    def _start_api_server(self):
        """
        Start the HTTP API server in a separate thread
        """
        try:
            def run_server():
                server_address = ("", self.api_port)
                self.api_server = HTTPServer(server_address, AlertApi)
                logger.info(f"API Server started on port {self.api_port}")

                # Run until stopped
                while not self.stop_event.is_set():
                    self.api_server.handle_request()

                self.api_server.server_close()
                logger.info("API Server stopped")

            # Start API server in a thread
            self.api_thread = threading.Thread(target=run_server, daemon=True)
            self.api_thread.start()
        except Exception as e:
            logger.error(f"Failed to start API server: {e}")
            self.stop_event.set()

    def run(self):
        """
        Main run method to start all system components
        """
        try:
            # Start API server
            self._start_api_server()

            # Start UI
            ui_thread = self.ui.run()

            # Log system startup
            logger.info("Alarm System started successfully")

            # Wait for shutdown signal
            while not self.stop_event.is_set():
                self.stop_event.wait(timeout=1)

            # Graceful shutdown
            logger.info("Initiating system shutdown...")
        except Exception as e:
            logger.error(f"System startup error: {e}")
        finally:
            self._cleanup()

    def _cleanup(self):
        """
        Perform cleanup operations during shutdown
        """
        # Close API server if running
        if self.api_server:
            try:
                self.api_server.server_close()
            except Exception as e:
                logger.error(f"Error closing API server: {e}")

        # Stop threads
        if self.api_thread and self.api_thread.is_alive():
            self.api_thread.join(timeout=2)

        logger.info("Alarm System shutdown complete")

def main():
    """
    Entry point for the Alarm System
    Parse command-line arguments and start the system
    """
    # Default configurations
    default_port = 8000
    default_storage_path = "data/alerts.json"

    # Parse port from command line if provided
    port = int(sys.argv[1]) if len(sys.argv) > 1 else default_port

    # Create and run the Alarm System
    try:
        alarm_system = AlarmSystemManager(
            api_port=port,
            storage_path=default_storage_path
        )
        alarm_system.run()
    except Exception as e:
        logger.error(f"Fatal error starting Alarm System: {e}", exc_info=True)
        sys.exit(1)

if __name__ == "__main__":
    main()