"""Egress apply for the smolmachines backend.

The smolmachines sidecar bundle runs as a sidecar smolVM. Route-file
inspection and reload signalling therefore go through ``smolvm machine
exec`` instead of Docker.
"""

from __future__ import annotations

from ...egress import EGRESS_ROUTES_IN_CONTAINER
from ...log import warn
from ..egress_apply import EgressApplicator, EgressApplyError
from . import sidecar_bundle as _bundle
from . import smolvm as _smolvm


def fetch_current_routes(slug: str) -> str:
    machine = _bundle.bundle_machine_name(slug)
    result = _smolvm.machine_exec(machine, ["cat", EGRESS_ROUTES_IN_CONTAINER])
    if result.returncode != 0:
        raise EgressApplyError(
            f"could not read routes.yaml from {machine}: "
            f"{(result.stderr or '').strip() or 'sidecar VM not running?'}"
        )
    return result.stdout


class SmolmachinesEgressApplicator(EgressApplicator):
    def _signal_bundle_reload(self, slug: str) -> None:
        machine = _bundle.bundle_machine_name(slug)
        result = _smolvm.machine_exec(machine, ["sh", "-c", "kill -HUP 1"])
        if result.returncode != 0:
            last_error = (result.stderr or "").strip() or (result.stdout or "").strip()
            warn(
                f"egress: routes updated on disk for {slug}, but bundle reload failed: "
                f"{last_error or 'smolvm exec failed'}"
            )
            raise EgressApplyError(
                f"could not reload egress bundle {machine}: "
                f"{last_error or 'smolvm exec failed'}"
            )


applicator = SmolmachinesEgressApplicator()


__all__ = [
    "SmolmachinesEgressApplicator",
    "EgressApplyError",
    "applicator",
    "fetch_current_routes",
]