#!/usr/bin/env python3
"""
ObsiGate Desktop — Sidecar Launcher
====================================
Lancé par le shell Tauri, démarre le backend FastAPI.
Utilise le port 17890 (127.0.0.1 uniquement, pas d'exposition réseau).
"""
import sys
import os
import subprocess
import time
import signal

BACKEND_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
HOST = "127.0.0.1"
PORT = int(os.environ.get("OBSIGATE_PORT", "17890"))


def find_free_port(start: int) -> int:
    """Trouve le premier port libre à partir de `start`."""
    import socket
    port = start
    while port < start + 100:
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            if s.connect_ex((HOST, port)) != 0:
                return port
        port += 1
    raise RuntimeError(f"No free port found in range {start}-{start+99}")


def main():
    port = find_free_port(PORT)

    # Create log directory
    if sys.platform == "win32":
        log_dir = os.path.join(os.environ.get("APPDATA", os.path.expanduser("~")), "ObsiGate", "logs")
    else:
        log_dir = os.path.join(os.path.expanduser("~"), ".local", "share", "obsigate", "logs")
    os.makedirs(log_dir, exist_ok=True)

    log_file = os.path.join(log_dir, "backend.log")
    print(f"ObsiGate backend starting on {HOST}:{port} — logs: {log_file}")

    # Launch uvicorn
    cmd = [
        sys.executable,
        "-m", "uvicorn",
        "backend.main:app",
        "--host", HOST,
        "--port", str(port),
        "--log-level", "info",
    ]

    with open(log_file, "a") as log:
        log.write(f"\n--- ObsiGate started at {time.ctime()} ---\n")
        proc = subprocess.Popen(cmd, cwd=BACKEND_DIR, stdout=log, stderr=log)

        def handle_signal(signum, frame):
            print("Shutting down ObsiGate backend...")
            proc.terminate()
            proc.wait(timeout=10)
            sys.exit(0)

        signal.signal(signal.SIGTERM, handle_signal)
        signal.signal(signal.SIGINT, handle_signal)

        # Wait for backend to finish
        proc.wait()


if __name__ == "__main__":
    main()