"""Tests for fable_*_task tools."""
from datetime import datetime, timezone
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from scribe.mcp._context import _user_id_ctx
from scribe.mcp.tools.tasks import (
    list_tasks, get_task, create_task,
    update_task, add_task_log,
)


@pytest.fixture(autouse=True)
def _bind_user():
    token = _user_id_ctx.set(7)
    yield
    _user_id_ctx.reset(token)


def _fake_task(*, parent_id: int | None = None, **overrides) -> MagicMock:
    n = MagicMock()
    n.parent_id = parent_id
    base = {
        "id": 1, "title": "t", "body": "", "status": "todo",
        "priority": "none", "tags": [], "parent_id": parent_id,
        "is_task": True,
    }
    base.update(overrides)
    n.to_dict.return_value = base
    n.title = base["title"]
    return n


@pytest.mark.asyncio
async def test_list_tasks_passes_is_task_true_and_repackages():
    rows = [_fake_task(id=1), _fake_task(id=2)]
    mock = AsyncMock(return_value=(rows, 2))
    with patch("scribe.mcp.tools.tasks.notes_svc.list_notes", mock):
        out = await list_tasks()
    assert out["total"] == 2
    assert len(out["tasks"]) == 2
    assert mock.call_args.kwargs["is_task"] is True


@pytest.mark.asyncio
async def test_list_tasks_status_filter():
    mock = AsyncMock(return_value=([], 0))
    with patch("scribe.mcp.tools.tasks.notes_svc.list_notes", mock):
        await list_tasks(status="in_progress")
    assert mock.call_args.kwargs["status"] == "in_progress"


@pytest.mark.asyncio
async def test_list_tasks_empty_status_means_no_filter():
    mock = AsyncMock(return_value=([], 0))
    with patch("scribe.mcp.tools.tasks.notes_svc.list_notes", mock):
        await list_tasks(status="")
    assert mock.call_args.kwargs["status"] is None


@pytest.mark.asyncio
async def test_get_task_with_no_parent_returns_null_parent_title():
    fake = _fake_task(id=5, title="solo", parent_id=None)
    with patch(
        "scribe.mcp.tools.tasks.notes_svc.get_note",
        AsyncMock(return_value=fake),
    ):
        out = await get_task(task_id=5)
    assert out["parent_title"] is None
    assert out["title"] == "solo"


@pytest.mark.asyncio
async def test_get_task_enriches_with_parent_title():
    """When parent_id is set, get_task fetches the parent and adds parent_title."""
    child = _fake_task(id=10, title="child", parent_id=5)
    parent = _fake_task(id=5, title="parent of 10", parent_id=None)
    # get_note is called twice: once for child, once for parent
    mock_get = AsyncMock(side_effect=[child, parent])
    with patch("scribe.mcp.tools.tasks.notes_svc.get_note", mock_get):
        out = await get_task(task_id=10)
    assert out["parent_title"] == "parent of 10"
    assert mock_get.await_count == 2


@pytest.mark.asyncio
async def test_get_task_parent_missing_returns_null():
    """If parent_id is set but the parent is gone (orphaned), parent_title is None."""
    child = _fake_task(id=10, parent_id=5)
    mock_get = AsyncMock(side_effect=[child, None])
    with patch("scribe.mcp.tools.tasks.notes_svc.get_note", mock_get):
        out = await get_task(task_id=10)
    assert out["parent_title"] is None


@pytest.mark.asyncio
async def test_get_task_raises_when_not_found():
    with patch(
        "scribe.mcp.tools.tasks.notes_svc.get_note",
        AsyncMock(return_value=None),
    ):
        with pytest.raises(ValueError, match="task 999 not found"):
            await get_task(task_id=999)


@pytest.mark.asyncio
async def test_create_task_passes_status():
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.create_note", mock):
        await create_task(title="do x", status="todo")
    assert mock.call_args.kwargs["status"] == "todo"


@pytest.mark.asyncio
async def test_create_task_blocked_by_duplicate_gate():
    """A near-duplicate blocks creation and returns the existing id (no insert)."""
    from scribe.services.dedup import DuplicateMatch
    dup = DuplicateMatch(id=42, title="Set up CI", similarity=1.0, reason="title")
    create_mock = AsyncMock()
    with patch("scribe.mcp.tools.tasks.dedup_svc.find_duplicate_note",
               AsyncMock(return_value=dup)), \
         patch("scribe.mcp.tools.tasks.notes_svc.create_note", create_mock):
        out = await create_task(title="set up ci")
    assert out["duplicate"] is True
    assert out["existing_id"] == 42
    create_mock.assert_not_called()  # nothing was created


@pytest.mark.asyncio
async def test_create_task_force_bypasses_duplicate_gate():
    """force=true skips the gate entirely and creates."""
    find_mock = AsyncMock()
    with patch("scribe.mcp.tools.tasks.dedup_svc.find_duplicate_note", find_mock), \
         patch("scribe.mcp.tools.tasks.notes_svc.create_note",
               AsyncMock(return_value=_fake_task(id=9))):
        out = await create_task(title="dup", force=True)
    assert out["id"] == 9
    find_mock.assert_not_called()  # gate not even consulted


@pytest.mark.asyncio
async def test_create_task_rejects_retired_plan_kind():
    """kind=plan is hard-retired — plans are milestones (start_planning)."""
    mock = AsyncMock()
    with patch("scribe.mcp.tools.tasks.notes_svc.create_note", mock):
        with pytest.raises(ValueError, match="kind=plan is retired"):
            await create_task(title="x", kind="plan")
    assert not mock.called  # never reached the create


@pytest.mark.asyncio
async def test_create_task_priority_empty_becomes_none():
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.create_note", mock):
        await create_task(title="x", priority="")
    assert mock.call_args.kwargs["priority"] is None


@pytest.mark.asyncio
async def test_create_task_zero_id_sentinels_become_none():
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.create_note", mock):
        await create_task(title="x", project_id=0, milestone_id=0, parent_id=0)
    assert mock.call_args.kwargs["project_id"] is None
    assert mock.call_args.kwargs["milestone_id"] is None
    assert mock.call_args.kwargs["parent_id"] is None


@pytest.mark.asyncio
async def test_update_task_only_sends_non_default_fields():
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, status="done")
    args, kwargs = mock.call_args
    assert args == (7, 1)
    assert kwargs == {"status": "done"}


@pytest.mark.asyncio
async def test_update_task_empty_priority_is_omitted():
    """Priority="" is "leave unchanged" — must not reach service as empty string."""
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, status="done", priority="")
    assert "priority" not in mock.call_args.kwargs


@pytest.mark.asyncio
async def test_update_task_raises_when_not_found():
    with patch(
        "scribe.mcp.tools.tasks.notes_svc.update_note",
        AsyncMock(return_value=None),
    ):
        with pytest.raises(ValueError, match="task 999 not found"):
            await update_task(task_id=999, status="done")


@pytest.mark.asyncio
async def test_update_task_milestone_zero_is_omitted():
    """milestone_id=0 is 'leave unchanged' — must not reach the service."""
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, milestone_id=0)
    assert "milestone_id" not in mock.call_args.kwargs


@pytest.mark.asyncio
async def test_update_task_milestone_positive_is_set():
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, milestone_id=42)
    assert mock.call_args.kwargs["milestone_id"] == 42


@pytest.mark.asyncio
async def test_update_task_milestone_negative_one_clears():
    """milestone_id=-1 clears the milestone (sets the column NULL)."""
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, milestone_id=-1)
    assert mock.call_args.kwargs["milestone_id"] is None


@pytest.mark.asyncio
async def test_update_task_clearing_project_also_clears_milestone():
    """project_id=-1 clears the project and, with it, the milestone."""
    fake = _fake_task()
    mock = AsyncMock(return_value=fake)
    with patch("scribe.mcp.tools.tasks.notes_svc.update_note", mock):
        await update_task(task_id=1, project_id=-1)
    assert mock.call_args.kwargs["project_id"] is None
    assert mock.call_args.kwargs["milestone_id"] is None


@pytest.mark.asyncio
async def test_add_task_log_returns_log_dict():
    log = MagicMock()
    log.id = 5
    log.task_id = 1
    log.content = "checkpoint"
    log.created_at = datetime(2026, 5, 26, 12, tzinfo=timezone.utc)
    # No to_dict on TaskLog model (per task_logs.py inspection) — fall through to manual dict
    del log.to_dict
    with patch(
        "scribe.mcp.tools.tasks.task_logs_svc.create_log",
        AsyncMock(return_value=log),
    ):
        out = await add_task_log(task_id=1, content="checkpoint")
    assert out["id"] == 5
    assert out["task_id"] == 1
    assert out["content"] == "checkpoint"
    assert out["created_at"].startswith("2026-05-26")


@pytest.mark.asyncio
async def test_add_task_log_propagates_value_error_when_task_missing():
    """create_log raises ValueError if the task doesn't exist; we let it through."""
    with patch(
        "scribe.mcp.tools.tasks.task_logs_svc.create_log",
        AsyncMock(side_effect=ValueError("Task 999 not found")),
    ):
        with pytest.raises(ValueError):
            await add_task_log(task_id=999, content="x")