"""Minimal threaded HTTP server for diff-remote / verify-public tests."""

from __future__ import annotations

import contextlib
import threading
from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
from pathlib import Path
from typing import Iterator


class _Handler(SimpleHTTPRequestHandler):
    def log_message(self, format, *args):  # noqa: A002
        pass  # silence


@contextlib.contextmanager
def serve_dir(root: Path) -> Iterator[str]:
    """Serve `root` on 127.0.0.1:<free port>, yield the base URL."""
    handler = lambda *a, **kw: _Handler(*a, directory=str(root), **kw)  # noqa: E731
    server = ThreadingHTTPServer(("127.0.0.1", 0), handler)
    thread = threading.Thread(target=server.serve_forever, daemon=True)
    thread.start()
    try:
        yield f"http://127.0.0.1:{server.server_port}"
    finally:
        server.shutdown()
        server.server_close()
        thread.join(timeout=2)