"""Entry point for the dev agent.

Loads configuration, builds the agent, and stays up until told to stop.
Shutdown is deliberate rather than abrupt: L8's durability guarantees assume
the process may die at any moment, but a clean stop still beats relying on
them.
"""

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

from nisse_dev.agent import build_agent
from nisse_dev.config import AgentConfig, ConfigError
from nisse_dev.envfile import load_env_file


def main() -> int:
    load_env_file(Path(os.environ.get("NISSE_ENV", ".env")).expanduser())
    try:
        config = AgentConfig.load()
    except ConfigError as exc:
        # Fail here rather than twenty minutes into a milestone on the one
        # call that needed the missing value.
        print(f"nisse-dev: {exc}", file=sys.stderr)
        return 2

    if config.loop == "new":
        from nisse_dev.loop.build import build_loop_agent

        agent = build_loop_agent(config)
    else:
        agent = build_agent(config)

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

    signal.signal(signal.SIGINT, shutdown)
    signal.signal(signal.SIGTERM, shutdown)

    agent.start()
    print(f"nisse-dev: ready as {agent.account} on {config.project}", file=sys.stderr)
    agent.wait()
    return 0


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