"""
Gradio UI Server Entry Point

Starts the Gradio web interface for UI element detection.

IMPORTANT: The API server must be running for this to work!

Usage:
    # Terminal 1: Start API server
    python app_api.py
    
    # Terminal 2: Start UI server
    python app_ui.py

The UI will be available at:
    - Gradio Interface: http://localhost:7860

Configuration:
    Set environment variables to customize:
    - CU1_API_URL: API endpoint (default: http://localhost:8000)
    - GRADIO_SERVER_NAME: Server host (default: 0.0.0.0)
    - GRADIO_SERVER_PORT: Server port (default: 7860)
    - GRADIO_SHARE: Enable sharing (default: false)
"""

import os
os.environ['PYTORCH_ENABLE_MPS_FALLBACK'] = '1'

from ui.gradio_interface import create_gradio_interface


def main():
    """Start the Gradio UI server"""
    api_url = os.getenv("CU1_API_URL", "http://localhost:8000")
    
    print("=" * 70)
    print("🎨 CU-1 UI Element Detector - Gradio UI")
    print("=" * 70)
    print("\n⚠️  IMPORTANT: Make sure the API server is running!")
    print("  If not started, run in another terminal:")
    print("    python app_api.py")
    print(f"\n🔗 API Connection: {api_url}")
    print("  Change with: export CU1_API_URL=http://your-api:8000")
    print("\n📱 Gradio Interface: http://localhost:7860")
    print("\n🏗️  Architecture:")
    print("  This UI is a CLIENT of the API (service-oriented)")
    print("  All detection logic runs in the API server")
    print("  UI communicates via HTTP/REST")
    print("=" * 70 + "\n")
    
    demo = create_gradio_interface()
    
    # Read configuration from environment
    server_name = os.getenv("GRADIO_SERVER_NAME", "0.0.0.0")
    port_env = os.getenv("GRADIO_SERVER_PORT") or os.getenv("PORT")
    server_port = int(port_env) if port_env and port_env.isdigit() else 7860
    share_env = os.getenv("GRADIO_SHARE", "false").lower()
    share = share_env in {"1", "true", "yes", "y"}

    try:
        demo.queue().launch(
            server_name=server_name,
            server_port=server_port,
            share=share
        )
    except OSError as e:
        if "Cannot find empty port" in str(e):
            print(f"\n⚠️  Port {server_port} is busy, trying to find a free port...")
            demo.queue().launch(
                server_name=server_name,
                server_port=None,  # Auto-select free port
                share=share
            )
        else:
            raise


if __name__ == "__main__":
    main()