#!/usr/bin/env python3
"""Entry point for the Raspberry Pi Touchscreen Mixer UI.

A Kivy-based multi-touch mixer control surface for the
Raspberry Pi RT Audio Mixer. Connects to the mixer engine
via REST API + OSC.

Usage:
    python3 main_touch.py
    python3 main_touch.py --host 192.168.1.10 --port 8000
    python3 main_touch.py --api-key my-secret-key
    KIVY_DPI=220 python3 main_touch.py
"""

from __future__ import annotations

import argparse
import os
import sys


def main():
    parser = argparse.ArgumentParser(
        description="Raspberry Pi Touchscreen Mixer UI",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  %(prog)s                                    # local mixer on :8000
  %(prog)s --host 192.168.1.10                # remote mixer
  %(prog)s --host 127.0.0.1 --api-key abc123  # with auth
  KIVY_DPI=220 %(prog)s                       # force 220 DPI

Environment:
  MIXER_HOST       mixer hostname (default 127.0.0.1)
  MIXER_PORT       REST API port (default 8000)
  MIXER_OSC_PORT   OSC server port (default 9001)
  MIXER_API_KEY    API key for authentication
  KIVY_DPI         force screen DPI (auto-detected otherwise)
        """,
    )
    parser.add_argument(
        "--host", default=os.environ.get("MIXER_HOST", "127.0.0.1"),
        help="Mixer server hostname (default: 127.0.0.1)",
    )
    parser.add_argument(
        "--port", type=int, default=int(os.environ.get("MIXER_PORT", "8000")),
        help="REST API port (default: 8000)",
    )
    parser.add_argument(
        "--osc-port", type=int, default=int(os.environ.get("MIXER_OSC_PORT", "9001")),
        help="OSC server port (default: 9001)",
    )
    parser.add_argument(
        "--api-key", default=os.environ.get("MIXER_API_KEY", ""),
        help="API key for mixer authentication",
    )

    args = parser.parse_args()

    # Ensure src is on the path
    project_root = os.path.dirname(os.path.abspath(__file__))
    if project_root not in sys.path:
        sys.path.insert(0, project_root)

    # Import Kivy app (late import after CLI parsing)
    from src.ui.app import MixerApp

    app = MixerApp(
        host=args.host,
        rest_port=args.port,
        osc_port=args.osc_port,
        api_key=args.api_key,
    )

    print(f"Starting touchscreen mixer UI...")
    print(f"  Mixer server: {args.host}:{args.port}")
    print(f"  OSC server:   {args.host}:{args.osc_port}")
    print(f"  Touch to begin. ESC to cycle screens.")
    print()

    app.run()


if __name__ == "__main__":
    main()