# SPDX-License-Identifier: MIT
"""Unit tests for guest-sync host-side logic.

The guest-mutating steps (OEM delivery, urlacl, agent restart over /exec)
are covered by the real-Windows smoke gate, not here. These tests pin the
version-stamp comparison, the parse, and the trigger gating."""

from __future__ import annotations

import json

import pytest

from winpodx.core.config import Config
from winpodx.core.guest_sync import (
    GuestVersion,
    guest_sync_needed,
    host_version,
    maybe_autosync,
)


def test_host_version_shape() -> None:
    hv = host_version()
    assert isinstance(hv, GuestVersion)
    assert hv.winpodx  # non-empty
    assert hv.oem_bundle  # non-empty


def test_guest_version_equality() -> None:
    a = GuestVersion(winpodx="0.5.8", oem_bundle="25")
    assert a == GuestVersion(winpodx="0.5.8", oem_bundle="25")
    assert a != GuestVersion(winpodx="0.5.9", oem_bundle="25")
    assert a != GuestVersion(winpodx="0.5.8", oem_bundle="26")


def _cfg() -> Config:
    cfg = Config()
    cfg.pod.backend = "podman"
    cfg.pod.guest_autosync = True
    return cfg


def test_guest_sync_needed_when_stamp_absent(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr("winpodx.core.guest_sync.read_guest_version", lambda cfg: None)
    assert guest_sync_needed(_cfg()) is True


def test_guest_sync_needed_when_older(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(
        "winpodx.core.guest_sync.read_guest_version",
        lambda cfg: GuestVersion(winpodx="0.0.1", oem_bundle="1"),
    )
    assert guest_sync_needed(_cfg()) is True


def test_guest_sync_not_needed_when_current(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr("winpodx.core.guest_sync.read_guest_version", lambda cfg: host_version())
    assert guest_sync_needed(_cfg()) is False


def _agent_up(monkeypatch: pytest.MonkeyPatch, *, up: bool = True) -> None:
    """Patch AgentClient so maybe_autosync's health gate passes (or fails)."""
    import winpodx.core.agent as agent_mod

    class _Client:
        def __init__(self, cfg):  # noqa: ANN001
            pass

        def health(self):
            if not up:
                raise agent_mod.AgentUnavailableError("down")
            return {"ok": True}

    monkeypatch.setattr(agent_mod, "AgentClient", _Client)


def test_maybe_autosync_disabled(monkeypatch: pytest.MonkeyPatch) -> None:
    cfg = _cfg()
    cfg.pod.guest_autosync = False
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: pytest.fail("sync should not run when disabled"),
    )
    assert maybe_autosync(cfg) is False


def test_maybe_autosync_skips_when_current(monkeypatch: pytest.MonkeyPatch) -> None:
    _agent_up(monkeypatch)
    monkeypatch.setattr("winpodx.core.guest_sync.read_guest_version", lambda cfg: host_version())
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: pytest.fail("sync should not run when current"),
    )
    assert maybe_autosync(_cfg()) is False


def test_maybe_autosync_runs_when_stamp_older(monkeypatch: pytest.MonkeyPatch) -> None:
    _agent_up(monkeypatch)
    monkeypatch.setattr(
        "winpodx.core.guest_sync.read_guest_version",
        lambda cfg: GuestVersion(winpodx="0.0.1", oem_bundle="1"),
    )
    calls = {"n": 0}
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: calls.__setitem__("n", calls["n"] + 1),
    )
    assert maybe_autosync(_cfg()) is True
    assert calls["n"] == 1


def test_maybe_autosync_absent_stamp_records_no_sync(monkeypatch: pytest.MonkeyPatch) -> None:
    _agent_up(monkeypatch)
    # Fresh install / pre-stamp pod: must NOT sync (would disrupt first-boot
    # agent bring-up) -- just record the version.
    monkeypatch.setattr("winpodx.core.guest_sync.read_guest_version", lambda cfg: None)
    wrote = {"n": 0}
    monkeypatch.setattr(
        "winpodx.core.guest_sync.write_guest_version",
        lambda *a, **k: wrote.__setitem__("n", wrote["n"] + 1) or True,
    )
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: pytest.fail("sync must not run when stamp absent (fresh install)"),
    )
    assert maybe_autosync(_cfg()) is False
    assert wrote["n"] == 1


def test_maybe_autosync_skips_unsupported_backend(monkeypatch: pytest.MonkeyPatch) -> None:
    cfg = _cfg()
    cfg.pod.backend = "manual"
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: pytest.fail("sync should not run on the manual backend"),
    )
    assert maybe_autosync(cfg) is False


def test_read_guest_version_parses_stamp(monkeypatch: pytest.MonkeyPatch) -> None:
    from winpodx.core import guest_sync

    class _R:
        ok = True
        stdout = json.dumps({"winpodx": "0.5.8", "oem_bundle": "25"})
        stderr = ""
        rc = 0

    # read_guest_version goes through the agent-first run_via_transport
    # (imported inside the function); patch it on the source module.
    monkeypatch.setattr("winpodx.core.windows_exec.run_via_transport", lambda *a, **k: _R())
    gv = guest_sync.read_guest_version(_cfg())
    assert gv == GuestVersion(winpodx="0.5.8", oem_bundle="25")


def test_write_guest_version_uses_agent_transport(monkeypatch: pytest.MonkeyPatch) -> None:
    # The stamp write must go through the windowless agent transport, not the
    # FreeRDP run_in_windows path (which flashed a window + hit a 30s
    # RemoteApp-activation timeout on a fresh first boot). #341-followup.
    from winpodx.core import guest_sync

    class _R:
        ok = True
        stdout = ""
        stderr = ""
        rc = 0

    calls: list[str] = []

    def _fake_transport(cfg, payload, *, timeout=60, description="winpodx-exec"):
        calls.append(description)
        return _R()

    monkeypatch.setattr("winpodx.core.windows_exec.run_via_transport", _fake_transport)
    # If anything reaches the FreeRDP path the test fails loudly.
    monkeypatch.setattr(
        "winpodx.core.windows_exec.run_in_windows",
        lambda *a, **k: pytest.fail("stamp write must not use FreeRDP run_in_windows"),
    )
    assert guest_sync.write_guest_version(_cfg(), GuestVersion("0.5.9", "26")) is True
    assert calls == ["guest-version-write"]


def test_write_guest_version_defers_on_exec_error(monkeypatch: pytest.MonkeyPatch) -> None:
    # A transitioning agent fails clean -> False (best-effort, retried next
    # start); no exception escapes to the install flow.
    from winpodx.core import guest_sync
    from winpodx.core.windows_exec import WindowsExecError

    def _boom(*a, **k):
        raise WindowsExecError("agent transitioning")

    monkeypatch.setattr("winpodx.core.windows_exec.run_via_transport", _boom)
    assert guest_sync.write_guest_version(_cfg(), GuestVersion("0.5.9", "26")) is False


def test_config_guest_autosync_default_and_coerce() -> None:
    cfg = Config()
    assert cfg.pod.guest_autosync is True
    cfg.pod.guest_autosync = "nope"  # type: ignore[assignment]
    cfg.pod.__post_init__()
    assert cfg.pod.guest_autosync is True


def test_maybe_autosync_skips_when_agent_down(monkeypatch: pytest.MonkeyPatch) -> None:
    # Agent not up (fresh install bringing it online): skip silently --
    # no read/write/sync, no FreeRDP fallback (#install-cleanliness).
    _agent_up(monkeypatch, up=False)
    monkeypatch.setattr(
        "winpodx.core.guest_sync.read_guest_version",
        lambda cfg: pytest.fail("must not touch guest when agent down"),
    )
    monkeypatch.setattr(
        "winpodx.core.guest_sync.sync_guest",
        lambda *a, **k: pytest.fail("must not sync when agent down"),
    )
    assert maybe_autosync(_cfg()) is False


def test_sync_guest_uses_windowless_transport_not_freerdp(monkeypatch: pytest.MonkeyPatch) -> None:
    # All guest-mutating steps must ride the windowless agent channel; touching
    # FreeRDP run_in_windows pops a visible console (the flash regression that
    # appeared once guest-sync first fired on a 0.5.8 -> 0.5.9 upgrade).
    from winpodx.core import guest_sync, provisioner

    class _R:
        ok = True
        rc = 0
        stdout = "oem-refreshed"
        stderr = ""

    monkeypatch.setattr("winpodx.core.windows_exec.run_via_transport", lambda *a, **k: _R())
    monkeypatch.setattr(
        "winpodx.core.windows_exec.run_in_windows",
        lambda *a, **k: pytest.fail("sync_guest must not use FreeRDP run_in_windows (flash)"),
    )
    monkeypatch.setattr(guest_sync, "_serve_oem", lambda cfg: None)
    monkeypatch.setattr(guest_sync, "_stop_oem_server", lambda cfg: None)
    monkeypatch.setattr(guest_sync, "write_guest_version", lambda cfg, ver: True)
    monkeypatch.setattr(guest_sync, "_wait_agent_back", lambda cfg, **k: True)
    monkeypatch.setattr(provisioner, "apply_windows_runtime_fixes", lambda cfg: {"fix:x": "ok"})

    results = guest_sync.sync_guest(_cfg(), force=True)
    assert results.get("oem_delivery") == "ok"
    assert results.get("agent_restart") == "ok"
    assert results.get("agent_back") == "ok"