"""CLI entry point: ``relay <command>``."""

from __future__ import annotations

import argparse
import json
import logging
import signal
import sys

from relay.config import load_settings
from relay.daemon import Daemon
from relay.logs import configure as configure_logs
from relay.ntfy import topic_url
from relay.state import read_json


def _cmd_run(args: argparse.Namespace) -> int:
    settings = load_settings()
    configure_logs(settings.logs_dir, level=logging.DEBUG if args.verbose else logging.INFO)
    daemon = Daemon(settings)

    def _stop(signum: int, _frame: object) -> None:
        logging.getLogger(__name__).info("received signal %s; shutting down", signum)
        daemon.stop()

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

    try:
        daemon.run()
    except RuntimeError as exc:
        # Most commonly the lock file: another daemon is running.
        print(f"error: {exc}", file=sys.stderr)
        return 1
    return 0


def _cmd_status(_args: argparse.Namespace) -> int:
    settings = load_settings()
    status_path = settings.state_dir / "status.json"
    payload = read_json(status_path, default=None)
    if payload is None:
        print("no status file yet — has the daemon run?", file=sys.stderr)
        return 1
    print(json.dumps(payload, indent=2, sort_keys=False))
    return 0


def _cmd_topic(_args: argparse.Namespace) -> int:
    settings = load_settings()
    print(topic_url(settings.ntfy_topic))
    return 0


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(prog="relay", description="risv3-relay daemon")
    sub = parser.add_subparsers(dest="cmd", required=True)

    run = sub.add_parser("run", help="Run the daemon in the foreground")
    run.add_argument("-v", "--verbose", action="store_true")
    run.set_defaults(func=_cmd_run)

    status = sub.add_parser("status", help="Print the current daemon status")
    status.set_defaults(func=_cmd_status)

    topic = sub.add_parser("topic", help="Print the ntfy subscription URL")
    topic.set_defaults(func=_cmd_topic)

    args = parser.parse_args(argv)
    return args.func(args)


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