#!/usr/bin/env python3
"""
Script to run the FastAPI server for DICOM migration service.
"""
import os
import sys
import signal
import uvicorn
import argparse

def parse_args():
    """Parse command-line arguments."""
    parser = argparse.ArgumentParser(description='DICOM Migration API Server')
    parser.add_argument('--host', default='0.0.0.0', help='Host to bind to')
    parser.add_argument('--port', type=int, default=8000, help='Port to bind to')
    parser.add_argument('--token', help='API token for authentication (overrides environment variable)')
    parser.add_argument('--reload', action='store_true', help='Enable auto-reload for development')
    return parser.parse_args()

def handle_exit(signum, frame):
    """Handle exit signals gracefully."""
    print(f"Received signal {signum}, shutting down gracefully...")
    # Let uvicorn handle the exit
    sys.exit(0)

def main():
    """Main function to run the API server."""
    args = parse_args()
    
    # Set API token if provided
    if args.token:
        os.environ['API_TOKEN'] = args.token
    
    # Check if API_TOKEN is set
    if not os.environ.get('API_TOKEN'):
        print("WARNING: API_TOKEN not set. Using default token '$2y$05$o1Sfikmwynq76PmuBkJeROpS2WcD.Sh4lgrjohMicnlhBlGAt8UAq'.")
        print("Set environment variable API_TOKEN or use --token argument for better security.")
    
    # Set up signal handlers for graceful shutdown
    signal.signal(signal.SIGINT, handle_exit)
    signal.signal(signal.SIGTERM, handle_exit)
    
    print(f"Starting DICOM Migration API server on {args.host}:{args.port}")
    uvicorn.run(
        "main:app", 
        host=args.host, 
        port=args.port, 
        reload=args.reload
    )

if __name__ == "__main__":
    main()