#!/usr/bin/env python3
"""
COBY Multi-Exchange Data Aggregation System
Main application entry point for Docker deployment
"""

import asyncio
import signal
import sys
import os
import argparse
from typing import Optional

# Add the current directory to Python path
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from utils.logging import get_logger, setup_logging
from config import Config
from monitoring.metrics_collector import metrics_collector
from monitoring.performance_monitor import get_performance_monitor
from monitoring.memory_monitor import memory_monitor
from api.rest_api import create_app
from api.websocket_server import WebSocketServer

logger = get_logger(__name__)


class COBYApplication:
    """Main COBY application orchestrator"""
    
    def __init__(self, config: Config):
        self.config = config
        self.running = False
        self.tasks = []
        self.websocket_server: Optional[WebSocketServer] = None
        
    async def start(self):
        """Start all application components"""
        try:
            logger.info("Starting COBY Multi-Exchange Data Aggregation System")
            
            # Start monitoring systems
            logger.info("Starting monitoring systems...")
            metrics_collector.start_collection()
            get_performance_monitor().start_monitoring()
            memory_monitor.start_monitoring()
            
            # Start WebSocket server
            logger.info("Starting WebSocket server...")
            self.websocket_server = WebSocketServer(
                host=self.config.api.host,
                port=self.config.api.websocket_port
            )
            websocket_task = asyncio.create_task(self.websocket_server.start())
            self.tasks.append(websocket_task)
            
            # Start REST API server (includes static file serving)
            logger.info("Starting REST API server with static file serving...")
            app = create_app(self.config)
            api_task = asyncio.create_task(
                self._run_api_server(app, self.config.api.host, self.config.api.port)
            )
            self.tasks.append(api_task)
            
            # Start exchange connectors (placeholder for now)
            logger.info("Exchange connectors would start here...")
            
            # Start data processing pipeline (placeholder for now)
            logger.info("Data processing pipeline would start here...")
            
            self.running = True
            logger.info("COBY system started successfully")
            
            # Wait for all tasks
            await asyncio.gather(*self.tasks, return_exceptions=True)
            
        except Exception as e:
            logger.error(f"Error starting COBY application: {e}")
            raise
    
    async def stop(self):
        """Stop all application components"""
        if not self.running:
            return
            
        logger.info("Stopping COBY Multi-Exchange Data Aggregation System")
        
        try:
            # Stop WebSocket server
            if self.websocket_server:
                await self.websocket_server.stop()
            
            # Cancel all tasks
            for task in self.tasks:
                if not task.done():
                    task.cancel()
            
            # Wait for tasks to complete
            if self.tasks:
                await asyncio.gather(*self.tasks, return_exceptions=True)
            
            # Stop monitoring systems
            memory_monitor.stop_monitoring()
            get_performance_monitor().stop_monitoring()
            metrics_collector.stop_collection()
            
            self.running = False
            logger.info("COBY system stopped successfully")
            
        except Exception as e:
            logger.error(f"Error stopping COBY application: {e}")
    
    async def _run_api_server(self, app, host: str, port: int):
        """Run the API server"""
        try:
            # Import here to avoid circular imports
            import uvicorn
            
            config = uvicorn.Config(
                app,
                host=host,
                port=port,
                log_level="info",
                access_log=True
            )
            server = uvicorn.Server(config)
            await server.serve()
            
        except ImportError:
            logger.error("uvicorn not available, falling back to basic server")
            # Fallback implementation would go here
            await asyncio.sleep(3600)  # Keep running for an hour


async def main():
    """Main application entry point"""
    parser = argparse.ArgumentParser(description='COBY Multi-Exchange Data Aggregation System')
    parser.add_argument('--debug', action='store_true', help='Enable debug mode')
    parser.add_argument('--reload', action='store_true', help='Enable auto-reload (development)')
    parser.add_argument('--config', type=str, help='Configuration file path')
    
    args = parser.parse_args()
    
    # Setup logging
    log_level = 'DEBUG' if args.debug else 'INFO'
    setup_logging(level=log_level)
    
    # Load configuration
    config = Config()
    if args.debug:
        config.debug = True
        config.logging.level = 'DEBUG'
    
    # Create and start application
    app = COBYApplication(config)
    
    # Setup signal handlers
    def signal_handler(signum, frame):
        logger.info(f"Received signal {signum}, shutting down...")
        asyncio.create_task(app.stop())
    
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)
    
    try:
        await app.start()
    except KeyboardInterrupt:
        logger.info("Received keyboard interrupt, shutting down...")
    except Exception as e:
        logger.error(f"Application error: {e}")
        sys.exit(1)
    finally:
        await app.stop()


if __name__ == "__main__":
    # Ensure we're running in the correct directory
    os.chdir(os.path.dirname(os.path.abspath(__file__)))
    
    # Run the application
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("\nShutdown complete")
    except Exception as e:
        print(f"Fatal error: {e}")
        sys.exit(1)