"""Entry point for the review agent: loads its configuration, checks its
access, and reviews until told to stop."""

import os
import signal
import sys
from pathlib import Path
from types import FrameType

from nisse_core.config import ConfigError
from nisse_core.envfile import load_env_file
from nisse_core.gitea import GiteaError
from nisse_review.access import AccessRefused
from nisse_review.build import StartupError, build
from nisse_review.config import ReviewConfig


def main() -> int:
    load_env_file(Path(os.environ.get("NISSE_ENV", ".env")).expanduser())
    try:
        config = ReviewConfig.load()
        built = build(config)
    except (ConfigError, StartupError, GiteaError) as exc:
        print(f"nisse-review: {exc}", file=sys.stderr)
        return 2

    def shutdown(_signum: int, _frame: FrameType | None) -> None:
        print("nisse-review: stopping", file=sys.stderr)
        built.stop()

    signal.signal(signal.SIGINT, shutdown)
    signal.signal(signal.SIGTERM, shutdown)
    print(
        f"nisse-review: ready as {built.account}, reading "
        + (", ".join(built.repositories) or "no repositories"),
        file=sys.stderr,
    )
    try:
        built.scheduler.run_forever()
    except AccessRefused as exc:
        # R3: a grant made while it ran. It stops rather than review on.
        print(f"nisse-review: stopping: {exc}", file=sys.stderr)
        return 3
    finally:
        built.close()
    return 0


if __name__ == "__main__":
    sys.exit(main())