"""Tests for manual pin / unpin on note versions."""
from unittest.mock import AsyncMock, MagicMock, patch


def _mock_session_for_version(mock_version):
    mock_session = AsyncMock()
    result = MagicMock()
    result.scalars.return_value.first.return_value = mock_version
    mock_session.execute = AsyncMock(return_value=result)
    mock_session.commit = AsyncMock()
    mock_session.refresh = AsyncMock()
    mock_session.__aenter__ = AsyncMock(return_value=mock_session)
    mock_session.__aexit__ = AsyncMock(return_value=False)
    return mock_session


async def test_pin_version_sets_manual_kind_and_label():
    mock_version = MagicMock()
    mock_version.pin_kind = None
    mock_version.pin_label = None

    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=_mock_session_for_version(mock_version),
    ):
        from scribe.services.version_pinning import pin_version
        result = await pin_version(
            user_id=1, note_id=42, version_id=7, label="the runbook circa Q2",
        )

    assert result is mock_version
    assert mock_version.pin_kind == "manual"
    assert mock_version.pin_label == "the runbook circa Q2"


async def test_pin_version_accepts_null_label():
    """label is optional — pinning with no label is allowed."""
    mock_version = MagicMock()
    mock_version.pin_kind = None
    mock_version.pin_label = None

    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=_mock_session_for_version(mock_version),
    ):
        from scribe.services.version_pinning import pin_version
        await pin_version(user_id=1, note_id=42, version_id=7, label=None)

    assert mock_version.pin_kind == "manual"
    assert mock_version.pin_label is None


async def test_pin_version_promotes_auto_to_manual_with_label_update():
    """Pinning an already-auto-pinned version promotes it and updates label."""
    mock_version = MagicMock()
    mock_version.pin_kind = "auto"
    mock_version.pin_label = "stable 2026-04-01 → 2026-04-05"

    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=_mock_session_for_version(mock_version),
    ):
        from scribe.services.version_pinning import pin_version
        await pin_version(
            user_id=1, note_id=42, version_id=7, label="post-network-refresh",
        )

    assert mock_version.pin_kind == "manual"
    assert mock_version.pin_label == "post-network-refresh"


async def test_pin_version_rejects_overlong_label():
    """Labels are capped at 500 chars to keep the UI sane."""
    mock_version = MagicMock()
    mock_version.pin_kind = None

    # The cap is checked before any DB access, so the session shouldn't
    # even be entered. We still patch it to avoid accidental DB lookups
    # if the implementation order changes.
    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=_mock_session_for_version(mock_version),
    ):
        from scribe.services.version_pinning import pin_version
        try:
            await pin_version(
                user_id=1, note_id=42, version_id=7, label="x" * 501,
            )
            assert False, "expected ValueError"
        except ValueError as e:
            assert "500" in str(e) or "long" in str(e).lower()


async def test_pin_version_returns_none_when_not_found():
    mock_session = AsyncMock()
    result = MagicMock()
    result.scalars.return_value.first.return_value = None
    mock_session.execute = AsyncMock(return_value=result)
    mock_session.commit = AsyncMock()
    mock_session.refresh = AsyncMock()
    mock_session.__aenter__ = AsyncMock(return_value=mock_session)
    mock_session.__aexit__ = AsyncMock(return_value=False)

    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=mock_session,
    ):
        from scribe.services.version_pinning import pin_version
        out = await pin_version(user_id=1, note_id=42, version_id=99, label=None)

    assert out is None


async def test_unpin_version_clears_kind_and_label():
    mock_version = MagicMock()
    mock_version.pin_kind = "manual"
    mock_version.pin_label = "previous label"

    with patch(
        "scribe.services.version_pinning.async_session",
        return_value=_mock_session_for_version(mock_version),
    ):
        from scribe.services.version_pinning import unpin_version
        result = await unpin_version(user_id=1, note_id=42, version_id=7)

    assert result is mock_version
    assert mock_version.pin_kind is None
    assert mock_version.pin_label is None