"""threshold-event-detector 入口（python -m detector）。

用法：
    python -m detector [--addr 0.0.0.0:8080] [--no-seed]

默认以进程内存储启动（零依赖），写入示例规则并监听 REST API；可通过环境变量
HMS_* 切换 MySQL / Redis / Kafka 驱动（需安装对应可选依赖）。
"""

from __future__ import annotations

import argparse
import signal

from .api import APIServer
from .app import DetectorApp
from .config import Config


def main(argv=None) -> int:
    parser = argparse.ArgumentParser(description="threshold-event-detector")
    parser.add_argument("--addr", default=None, help="HTTP listen address, e.g. 0.0.0.0:8080")
    parser.add_argument("--no-seed", action="store_true", help="do not seed demo rules")
    args = parser.parse_args(argv)

    config = Config.from_env()
    if args.addr:
        config.http_addr = args.addr

    app = DetectorApp(config)
    if not args.no_seed and config.seed_demo_rules:
        app.seed_demo_rules()
    app.start()

    api = APIServer(app, config.http_addr)
    print(f"[threshold-event-detector] listening on http://{config.http_addr}", flush=True)

    def _stop(signum, frame):  # noqa: ARG001
        print("\n[threshold-event-detector] shutting down...", flush=True)
        api.shutdown()
        app.stop()

    signal.signal(signal.SIGINT, _stop)
    signal.signal(signal.SIGTERM, _stop)

    try:
        api.serve_forever()
    finally:
        app.stop()
    return 0


if __name__ == "__main__":
    raise SystemExit(main())