"""Tests for tools/quarantine_unstamped.py.

This is the one-shot drain that we run on each lab host once after the
commit-gate goes live. The behaviour we care about:
  - episodes WITH a 40-char-hex code_version.commit stay put
  - episodes WITHOUT that field move to quarantine/
  - episodes lacking done.marker (still being written) are untouched
  - quarantine/<id>/quarantine_reason.json gets dropped beside it
  - re-running is a no-op (idempotent — pre-stamp episodes are gone,
    valid ones aren't touched)
"""

from __future__ import annotations

import importlib.util
import json
import sys
from pathlib import Path

import pytest


REPO_ROOT = Path(__file__).resolve().parent.parent
spec = importlib.util.spec_from_file_location(
    "quarantine_unstamped", REPO_ROOT / "tools" / "quarantine_unstamped.py"
)
qu = importlib.util.module_from_spec(spec)
sys.modules["quarantine_unstamped"] = qu
spec.loader.exec_module(qu)


def _ep(root: Path, name: str, *, meta: dict | None, done: bool = True) -> Path:
    """Stage a fake episode under <root>/episodes/<name>/."""
    d = root / "episodes" / name
    d.mkdir(parents=True)
    if meta is not None:
        (d / "meta.json").write_text(json.dumps(meta))
    if done:
        (d / "done.marker").touch()
    return d


def test_drain_moves_unstamped_to_quarantine(tmp_path: Path) -> None:
    _ep(tmp_path, "01OLD", meta={"host_id": "lab1"})  # no code_version
    res = qu.drain(tmp_path)
    assert res.scanned == 1
    assert res.quarantined == 1
    assert res.kept_stamped == 0
    assert not (tmp_path / "episodes" / "01OLD").exists()
    assert (tmp_path / "quarantine" / "01OLD" / "meta.json").exists()
    reason = json.loads(
        (tmp_path / "quarantine" / "01OLD" / "quarantine_reason.json").read_text()
    )
    assert reason["status_code"] == 400
    assert "pre-stamp" in reason["error"]


def test_drain_keeps_stamped_episode(tmp_path: Path) -> None:
    """A stamped episode (40-char-hex commit) belongs in the live
    queue — the shipper will succeed against the receiver gate."""
    _ep(tmp_path, "01NEW", meta={
        "code_version": {"commit": "a" * 40, "branch": "main", "dirty": False},
    })
    res = qu.drain(tmp_path)
    assert res.scanned == 1
    assert res.quarantined == 0
    assert res.kept_stamped == 1
    assert (tmp_path / "episodes" / "01NEW").exists()
    assert not (tmp_path / "quarantine" / "01NEW").exists()


def test_drain_rejects_short_commit(tmp_path: Path) -> None:
    """A truncated/garbled commit is not accepted as 'stamped' —
    receiver would 400 it as bad-format anyway."""
    _ep(tmp_path, "01SHORT", meta={"code_version": {"commit": "abc123"}})
    res = qu.drain(tmp_path)
    assert res.quarantined == 1


def test_drain_rejects_non_hex_commit(tmp_path: Path) -> None:
    bad = "z" * 40
    _ep(tmp_path, "01BADHEX", meta={"code_version": {"commit": bad}})
    res = qu.drain(tmp_path)
    assert res.quarantined == 1


def test_drain_skips_in_progress_episode(tmp_path: Path) -> None:
    """No done.marker means the orchestrator is still writing to the
    dir — leave it alone, drainer is for 'finished and queued' only."""
    _ep(tmp_path, "01PARTIAL", meta=None, done=False)
    res = qu.drain(tmp_path)
    assert res.scanned == 1
    assert res.skipped_no_marker == 1
    assert res.quarantined == 0
    assert (tmp_path / "episodes" / "01PARTIAL").exists()


def test_drain_handles_missing_meta_json(tmp_path: Path) -> None:
    """A done episode with no meta.json is corrupt — should be
    quarantined, not kept (it'd fail the gate too)."""
    _ep(tmp_path, "01NOMETA", meta=None, done=True)
    res = qu.drain(tmp_path)
    assert res.quarantined == 1
    assert (tmp_path / "quarantine" / "01NOMETA" / "quarantine_reason.json").exists()


def test_drain_is_idempotent(tmp_path: Path) -> None:
    _ep(tmp_path, "01OLD", meta={"host_id": "lab1"})
    _ep(tmp_path, "01NEW", meta={"code_version": {"commit": "a" * 40}})

    qu.drain(tmp_path)
    res2 = qu.drain(tmp_path)
    # Second pass: only the still-live stamped episode is scanned.
    assert res2.scanned == 1
    assert res2.kept_stamped == 1
    assert res2.quarantined == 0


def test_drain_missing_data_root_is_noop(tmp_path: Path) -> None:
    """First-boot: episodes/ may not exist yet. Drain shouldn't crash."""
    res = qu.drain(tmp_path / "does-not-exist")
    assert res.scanned == 0
    assert res.quarantined == 0


def test_drain_dry_run_moves_nothing(tmp_path: Path, capsys: pytest.CaptureFixture) -> None:
    _ep(tmp_path, "01OLD", meta={"host_id": "lab1"})
    res = qu.drain(tmp_path, dry_run=True)
    assert res.quarantined == 1   # counted as if quarantined
    # But the episode is still in episodes/ — nothing actually moved.
    assert (tmp_path / "episodes" / "01OLD").exists()
    assert not (tmp_path / "quarantine" / "01OLD").exists()
    out = capsys.readouterr().out
    assert "would-quarantine 01OLD" in out


def test_drain_collision_keeps_quarantine_copy(tmp_path: Path) -> None:
    """Re-running after a previous drain put the same id into
    quarantine. Should silently drop the live copy (matches the
    queue's _quarantine path semantics)."""
    _ep(tmp_path, "01DUP", meta={"host_id": "lab1"})
    # Pre-existing quarantine entry from a previous run:
    (tmp_path / "quarantine" / "01DUP").mkdir(parents=True)
    (tmp_path / "quarantine" / "01DUP" / "meta.json").write_text("{}")

    res = qu.drain(tmp_path)
    assert res.quarantined == 1
    assert not (tmp_path / "episodes" / "01DUP").exists()
    assert (tmp_path / "quarantine" / "01DUP" / "meta.json").exists()