"""
生成任务应用层用例单元测试（第十九波）

覆盖：
- CreateGenerationTaskUseCase
- GetGenerationTaskUseCase
- ListUserTasksFilteredUseCase
- RetryGenerationTaskUseCase
- Command / Filter / Result 对象
"""

from unittest.mock import MagicMock

import pytest

from packages.application.generation_tasks import (
    CreateGenerationTaskCommand,
    CreateGenerationTaskUseCase,
    GetGenerationTaskUseCase,
    ListGenerationTasksResult,
    ListTasksFilter,
    ListUserTasksFilteredUseCase,
    RetryGenerationTaskUseCase,
)
from packages.domain.generation_task import GenerationTask, GenerationTaskStatus


@pytest.fixture
def mock_repo():
    return MagicMock()


def make_task(status=GenerationTaskStatus.PENDING, **kwargs):
    task = GenerationTask(
        id="task-1",
        project_id="proj-1",
        asset_library_id="lib-1",
        strategy_id="strat-1",
        template_id="tmpl-1",
        asset_ids=["asset-1"],
        title_ids=["title-1"],
        voice_ids=["voice-1"],
        created_by_user_id="user-1",
        video_title="测试标题",
    )
    if status != GenerationTaskStatus.PENDING:
        object.__setattr__(task, "status", status)
    # 应用额外 kwargs
    for k, v in kwargs.items():
        object.__setattr__(task, k, v)
    return task


# ============================================================
# CreateGenerationTaskUseCase
# ============================================================


class TestCreateGenerationTaskUseCase:
    """CreateGenerationTaskUseCase 创建生成任务"""

    def test_create_success(self, mock_repo):
        """正常创建任务"""
        mock_repo.create.side_effect = lambda t: t

        cmd = CreateGenerationTaskCommand(
            project_id="proj-1",
            asset_library_id="lib-1",
            strategy_id="strat-1",
            voice_library_id="vlib-1",
            template_id="tmpl-1",
            asset_ids=["a1", "a2"],
            title_ids=["t1"],
            voice_ids=["v1"],
            created_by_user_id="user-1",
            source_edit_plan_id="plan-1",
            asset_select_mode="auto",
            batch_id="batch-1",
            video_title="我的视频",
            auto_retry_enabled=True,
            auto_retry_max=3,
        )
        uc = CreateGenerationTaskUseCase(mock_repo)
        task = uc.execute(cmd)

        assert task.project_id == "proj-1"
        assert task.asset_library_id == "lib-1"
        assert task.strategy_id == "strat-1"
        assert task.voice_library_id == "vlib-1"
        assert task.template_id == "tmpl-1"
        assert task.asset_ids == ["a1", "a2"]
        assert task.title_ids == ["t1"]
        assert task.voice_ids == ["v1"]
        assert task.created_by_user_id == "user-1"
        assert task.source_edit_plan_id == "plan-1"
        assert task.asset_select_mode == "auto"
        assert task.batch_id == "batch-1"
        assert task.video_title == "我的视频"
        assert task.auto_retry_enabled is True
        assert task.auto_retry_max == 3
        assert task.status == GenerationTaskStatus.PENDING
        assert task.progress == 0.0
        assert task.result_count == 0
        mock_repo.create.assert_called_once()

    def test_create_default_values(self, mock_repo):
        """默认参数值"""
        mock_repo.create.side_effect = lambda t: t

        cmd = CreateGenerationTaskCommand(
            project_id="proj-1",
            asset_library_id="lib-1",
        )
        uc = CreateGenerationTaskUseCase(mock_repo)
        task = uc.execute(cmd)

        assert task.asset_ids == []
        assert task.title_ids == []
        assert task.voice_ids == []
        assert task.created_by_user_id == ""
        assert task.video_title == ""
        assert task.auto_retry_enabled is False
        assert task.auto_retry_max == 0

    def test_create_id_is_generated(self, mock_repo):
        """ID 会自动生成"""
        mock_repo.create.side_effect = lambda t: t

        cmd = CreateGenerationTaskCommand(project_id="proj-1", asset_library_id="lib-1")
        uc = CreateGenerationTaskUseCase(mock_repo)
        task = uc.execute(cmd)

        assert task.id
        assert isinstance(task.id, str)
        assert len(task.id) > 10  # uuid hex


# ============================================================
# GetGenerationTaskUseCase
# ============================================================


class TestGetGenerationTaskUseCase:
    """GetGenerationTaskUseCase 获取任务"""

    def test_get_existing(self, mock_repo):
        """获取存在的任务"""
        task = make_task()
        mock_repo.get.return_value = task

        uc = GetGenerationTaskUseCase(mock_repo)
        result = uc.execute("task-1")

        assert result is task
        mock_repo.get.assert_called_once_with("task-1")

    def test_get_not_found(self, mock_repo):
        """获取不存在的任务返回 None"""
        mock_repo.get.return_value = None

        uc = GetGenerationTaskUseCase(mock_repo)
        result = uc.execute("nonexistent")

        assert result is None


# ============================================================
# ListUserTasksFilteredUseCase
# ============================================================


class TestListUserTasksFilteredUseCase:
    """ListUserTasksFilteredUseCase 按用户筛选任务"""

    def test_list_without_filters(self, mock_repo):
        """无筛选条件查询"""
        tasks = [make_task(), make_task()]
        mock_repo.list_by_user_filtered.return_value = tasks
        mock_repo.count_by_user_filtered.return_value = 2

        uc = ListUserTasksFilteredUseCase(mock_repo)
        result = uc.execute("user-1")

        assert isinstance(result, ListGenerationTasksResult)
        assert len(result.items) == 2
        assert result.total == 2
        mock_repo.list_by_user_filtered.assert_called_once_with("user-1", status=None, limit=None, offset=0)
        mock_repo.count_by_user_filtered.assert_called_once_with("user-1", status=None)

    def test_list_with_status_filter(self, mock_repo):
        """按状态筛选"""
        mock_repo.list_by_user_filtered.return_value = []
        mock_repo.count_by_user_filtered.return_value = 0

        uc = ListUserTasksFilteredUseCase(mock_repo)
        uc.execute("user-1", status="running")

        mock_repo.list_by_user_filtered.assert_called_once_with("user-1", status="running", limit=None, offset=0)
        mock_repo.count_by_user_filtered.assert_called_once_with("user-1", status="running")

    def test_list_with_pagination(self, mock_repo):
        """分页查询"""
        mock_repo.list_by_user_filtered.return_value = []
        mock_repo.count_by_user_filtered.return_value = 100

        uc = ListUserTasksFilteredUseCase(mock_repo)
        result = uc.execute("user-1", limit=10, offset=20)

        assert result.total == 100
        mock_repo.list_by_user_filtered.assert_called_once_with("user-1", status=None, limit=10, offset=20)

    def test_list_empty_result(self, mock_repo):
        """空结果"""
        mock_repo.list_by_user_filtered.return_value = []
        mock_repo.count_by_user_filtered.return_value = 0

        uc = ListUserTasksFilteredUseCase(mock_repo)
        result = uc.execute("user-1", status="failed")

        assert result.items == []
        assert result.total == 0


# ============================================================
# RetryGenerationTaskUseCase
# ============================================================


class TestRetryGenerationTaskUseCase:
    """RetryGenerationTaskUseCase 重试失败任务"""

    def test_retry_success(self, mock_repo):
        """失败任务重试成功"""
        task = make_task(
            status=GenerationTaskStatus.FAILED,
            error_message="网络超时",
            retry_count=0,
        )
        mock_repo.get.return_value = task
        mock_repo.update.side_effect = lambda t: t

        uc = RetryGenerationTaskUseCase(mock_repo)
        result = uc.execute("task-1")

        assert result.status == GenerationTaskStatus.PENDING
        assert result.retry_count == 1
        assert result.error_message == ""
        assert result.error_info == {}
        assert result.progress == 0.0
        assert result.result_count == 0
        assert result.started_at is None
        assert result.completed_at is None
        mock_repo.update.assert_called_once()

    def test_retry_not_found(self, mock_repo):
        """任务不存在"""
        mock_repo.get.return_value = None

        uc = RetryGenerationTaskUseCase(mock_repo)
        with pytest.raises(ValueError, match="任务不存在"):
            uc.execute("nonexistent")

    def test_retry_not_failed(self, mock_repo):
        """非失败状态不能重试"""
        task = make_task(status=GenerationTaskStatus.RUNNING)
        mock_repo.get.return_value = task

        uc = RetryGenerationTaskUseCase(mock_repo)
        with pytest.raises(ValueError, match="只有失败状态"):
            uc.execute("task-1")

    def test_retry_pending_not_allowed(self, mock_repo):
        """pending 状态不能重试"""
        task = make_task(status=GenerationTaskStatus.PENDING)
        mock_repo.get.return_value = task

        uc = RetryGenerationTaskUseCase(mock_repo)
        with pytest.raises(ValueError, match="只有失败状态"):
            uc.execute("task-1")

    def test_retry_preserves_id(self, mock_repo):
        """重试复用同一个 task_id"""
        task = make_task(status=GenerationTaskStatus.FAILED)
        original_id = task.id
        mock_repo.get.return_value = task
        mock_repo.update.side_effect = lambda t: t

        uc = RetryGenerationTaskUseCase(mock_repo)
        result = uc.execute("task-1")

        assert result.id == original_id


# ============================================================
# Command / Filter / Result 对象
# ============================================================


class TestCommandAndDataObjects:
    """命令对象和数据对象"""

    def test_create_command_defaults(self):
        cmd = CreateGenerationTaskCommand()
        assert cmd.project_id == ""
        assert cmd.asset_library_id == ""
        assert cmd.asset_ids == []
        assert cmd.title_ids == []
        assert cmd.voice_ids == []
        assert cmd.auto_retry_enabled is False
        assert cmd.auto_retry_max == 0

    def test_list_filter_defaults(self):
        f = ListTasksFilter()
        assert f.status is None

    def test_list_result(self):
        task = make_task()
        r = ListGenerationTasksResult(items=[task], total=1)
        assert len(r.items) == 1
        assert r.total == 1