"""Project-owned Uvicorn launcher with a parent-process control pipe.

Closing stdin requests a normal lifespan shutdown on Windows and macOS alike.
There is no HTTP shutdown endpoint and no lookup of unrelated processes.
"""
from __future__ import annotations

import argparse
import os
import sys
import threading

import uvicorn


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument("--port", type=int, default=8810)
    args = parser.parse_args()
    server = uvicorn.Server(uvicorn.Config("apps.server.main:app", host="127.0.0.1", port=args.port,
                                          timeout_graceful_shutdown=8))

    def watch_parent() -> None:
        try:
            # os.read avoids a daemon thread holding Python's buffered stdin lock
            # during interpreter shutdown. Any parent message or EOF means stop.
            os.read(sys.stdin.fileno(), 1024)
        except OSError:
            pass
        server.should_exit = True

    threading.Thread(target=watch_parent, name="assistant-parent-pipe", daemon=True).start()
    server.run()


if __name__ == "__main__":
    main()