"""
GenerationTask 领域模型单元测试
"""

import json
import time
from datetime import datetime, timezone

import pytest

from packages.domain.generation_task import (
    TERMINAL_STATUSES,
    GenerationTask,
    GenerationTaskStatus,
)


class TestGenerationTaskStatus:
    """GenerationTaskStatus 枚举测试"""

    def test_status_values(self):
        assert GenerationTaskStatus.PENDING == "pending"
        assert GenerationTaskStatus.RUNNING == "running"
        assert GenerationTaskStatus.COMPLETED == "completed"
        assert GenerationTaskStatus.FAILED == "failed"
        assert GenerationTaskStatus.CANCELLED == "cancelled"

    def test_terminal_statuses(self):
        assert GenerationTaskStatus.COMPLETED in TERMINAL_STATUSES
        assert GenerationTaskStatus.FAILED in TERMINAL_STATUSES
        assert GenerationTaskStatus.CANCELLED in TERMINAL_STATUSES
        assert GenerationTaskStatus.PENDING not in TERMINAL_STATUSES
        assert GenerationTaskStatus.RUNNING not in TERMINAL_STATUSES


class TestGenerationTaskCreate:
    """GenerationTask 创建测试"""

    def test_create_basic(self):
        """测试基本创建"""
        task = GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
        )
        assert task.id is not None
        assert task.project_id == "proj-123"
        assert task.asset_library_id == "lib-456"
        assert task.status == GenerationTaskStatus.PENDING
        assert task.progress == 0.0
        assert task.result_count == 0
        assert task.retry_count == 0
        assert task.asset_ids == []
        assert task.title_ids == []
        assert task.voice_ids == []
        assert task.logs == "[]"
        assert task.created_at is not None
        assert task.started_at is None
        assert task.completed_at is None

    def test_create_with_all_params(self):
        """测试创建带所有参数"""
        task = GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
            strategy_id="strat-789",
            voice_library_id="voice-lib-001",
            template_id="tmpl-001",
            asset_ids=["asset-1", "asset-2"],
            title_ids=["title-1"],
            voice_ids=["voice-1"],
            created_by_user_id="user-001",
            source_edit_plan_id="plan-001",
            asset_select_mode="smart",
            batch_id="batch-001",
            video_title="测试视频",
            resolution="1080x1920",
            auto_retry_enabled=True,
            auto_retry_max=3,
        )
        assert task.strategy_id == "strat-789"
        assert task.voice_library_id == "voice-lib-001"
        assert task.template_id == "tmpl-001"
        assert task.asset_ids == ["asset-1", "asset-2"]
        assert task.title_ids == ["title-1"]
        assert task.voice_ids == ["voice-1"]
        assert task.created_by_user_id == "user-001"
        assert task.source_edit_plan_id == "plan-001"
        assert task.asset_select_mode == "smart"
        assert task.batch_id == "batch-001"
        assert task.video_title == "测试视频"
        assert task.resolution == "1080x1920"
        assert task.auto_retry_enabled is True
        assert task.auto_retry_max == 3

    def test_create_with_bgm_config(self):
        """测试创建带自定义BGM配置"""
        bgm_cfg = {
            "enabled": True,
            "source": "asset",
            "asset_id": "bgm-asset-001",
            "volume": 0.6,
        }
        task = GenerationTask.create(
            project_id="",
            asset_library_id="",
            template_id="tmpl-001",
            asset_ids=["asset-1"],
            bgm_config=bgm_cfg,
        )
        assert task.bgm_config == bgm_cfg
        # 确保是副本，不是引用
        bgm_cfg["volume"] = 0.8
        assert task.bgm_config["volume"] == 0.6

    def test_create_default_bgm_config_empty(self):
        """测试默认BGM配置为空dict"""
        task = GenerationTask.create(
            project_id="",
            asset_library_id="",
            template_id="tmpl-001",
            asset_ids=["asset-1"],
        )
        assert task.bgm_config == {}
        assert isinstance(task.bgm_config, dict)

    def test_create_with_template_id_only(self):
        """测试只提供 template_id 不提供 project_id（应通过校验）"""
        task = GenerationTask.create(
            project_id="",
            asset_library_id="lib-456",
            template_id="tmpl-001",
        )
        assert task.project_id == ""
        assert task.template_id == "tmpl-001"

    def test_create_with_asset_ids_only(self):
        """测试只提供 asset_ids 不提供 asset_library_id（应通过校验）"""
        task = GenerationTask.create(
            project_id="proj-123",
            asset_library_id="",
            asset_ids=["asset-1", "asset-2"],
        )
        assert task.asset_library_id == ""
        assert task.asset_ids == ["asset-1", "asset-2"]

    def test_create_missing_project_and_template(self):
        """测试 project_id 和 template_id 都为空"""
        with pytest.raises(ValueError, match="至少需要提供一个"):
            GenerationTask.create(
                project_id="",
                asset_library_id="lib-456",
            )

    def test_create_missing_library_and_assets(self):
        """测试 asset_library_id 和素材列表都为空"""
        with pytest.raises(ValueError, match="至少需要提供一个"):
            GenerationTask.create(
                project_id="proj-123",
                asset_library_id="",
            )

    def test_create_strips_strings(self):
        """测试字符串字段被 strip"""
        task = GenerationTask.create(
            project_id="  proj-123  ",
            asset_library_id="  lib-456  ",
            strategy_id="  strat-789  ",
            template_id="  tmpl-001  ",
            video_title="  测试视频  ",
            resolution="  1080x1920  ",
        )
        assert task.project_id == "proj-123"
        assert task.asset_library_id == "lib-456"
        assert task.strategy_id == "strat-789"
        assert task.template_id == "tmpl-001"
        assert task.video_title == "测试视频"
        assert task.resolution == "1080x1920"

    def test_create_default_empty_lists(self):
        """测试 None 列表默认化为空列表"""
        task = GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
            asset_ids=None,
            title_ids=None,
            voice_ids=None,
        )
        assert task.asset_ids == []
        assert task.title_ids == []
        assert task.voice_ids == []

    def test_create_copies_list(self):
        """测试列表被复制（不共享引用）"""
        assets = ["a", "b"]
        task = GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
            asset_ids=assets,
        )
        assets.append("c")
        assert task.asset_ids == ["a", "b"]


class TestGenerationTaskStatusProperties:
    """状态属性测试"""

    @pytest.fixture
    def new_task(self):
        return GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
        )

    def test_is_terminal_pending(self, new_task):
        assert not new_task.is_terminal

    def test_is_terminal_running(self, new_task):
        new_task.mark_processing()
        assert not new_task.is_terminal

    def test_is_terminal_completed(self, new_task):
        new_task.mark_processing()
        new_task.mark_completed()
        assert new_task.is_terminal

    def test_is_terminal_failed(self, new_task):
        new_task.mark_processing()
        new_task.mark_failed("error")
        assert new_task.is_terminal

    def test_is_terminal_cancelled(self, new_task):
        new_task.mark_cancelled()
        assert new_task.is_terminal

    def test_is_completed(self, new_task):
        assert not new_task.is_completed
        new_task.mark_processing()
        assert not new_task.is_completed
        new_task.mark_completed()
        assert new_task.is_completed

    def test_is_failed(self, new_task):
        assert not new_task.is_failed
        new_task.mark_processing()
        new_task.mark_failed("error")
        assert new_task.is_failed

    def test_is_running(self, new_task):
        assert not new_task.is_running
        new_task.mark_processing()
        assert new_task.is_running


class TestGenerationTaskTransitions:
    """状态转换测试"""

    @pytest.fixture
    def new_task(self):
        return GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
        )

    # ===== Pending → Running =====

    def test_pending_to_running(self, new_task):
        """测试 pending → running"""
        new_task.mark_processing()
        assert new_task.status == GenerationTaskStatus.RUNNING
        assert new_task.started_at is not None
        assert new_task.error_message == ""

    def test_pending_to_running_clears_error(self, new_task):
        """测试 processing 清除错误信息"""
        # pending 可以直接 failed（跟 job 不同）
        new_task.mark_failed("some error")
        # 然后重试回 pending
        new_task.mark_pending_from_failed()
        new_task.mark_processing()
        assert new_task.error_message == ""

    # ===== Pending → Failed =====

    def test_pending_to_failed(self, new_task):
        """测试 pending → failed（可以直接失败）"""
        new_task.mark_failed("task failed before start")
        assert new_task.status == GenerationTaskStatus.FAILED
        assert new_task.error_message == "task failed before start"
        assert new_task.completed_at is not None

    def test_pending_to_failed_with_error_info(self, new_task):
        """测试 pending → failed 带 error_info"""
        error_info = {"error_type": "ValidationError", "stage": "init"}
        new_task.mark_failed("validation failed", error_info=error_info)
        assert new_task.error_info == error_info

    def test_pending_to_failed_default_error_info(self, new_task):
        """测试 pending → failed 默认 error_info"""
        new_task.mark_failed("some error")
        assert new_task.error_info["error_type"] == "UnknownError"
        assert new_task.error_info["message"] == "some error"
        assert "failed_at" in new_task.error_info

    # ===== Pending → Cancelled =====

    def test_pending_to_cancelled(self, new_task):
        """测试 pending → cancelled"""
        new_task.mark_cancelled()
        assert new_task.status == GenerationTaskStatus.CANCELLED
        assert new_task.completed_at is not None

    # ===== Running → Completed =====

    def test_running_to_completed(self, new_task):
        """测试 running → completed"""
        new_task.mark_processing()
        new_task.mark_completed(result_count=3)
        assert new_task.status == GenerationTaskStatus.COMPLETED
        assert new_task.progress == 100.0
        assert new_task.result_count == 3
        assert new_task.error_message == ""
        assert new_task.completed_at is not None

    def test_running_to_completed_default_count(self, new_task):
        """测试 running → completed 默认 result_count=1"""
        new_task.mark_processing()
        new_task.mark_completed()
        assert new_task.result_count == 1

    # ===== Running → Failed =====

    def test_running_to_failed(self, new_task):
        """测试 running → failed"""
        new_task.mark_processing()
        new_task.mark_failed("render timeout")
        assert new_task.status == GenerationTaskStatus.FAILED
        assert new_task.error_message == "render timeout"
        assert new_task.completed_at is not None

    # ===== Running → Cancelled =====

    def test_running_to_cancelled(self, new_task):
        """测试 running → cancelled"""
        new_task.mark_processing()
        new_task.mark_cancelled()
        assert new_task.status == GenerationTaskStatus.CANCELLED
        assert new_task.completed_at is not None

    # ===== Failed → Pending (重试) =====

    def test_failed_to_pending_retry(self, new_task):
        """测试 failed → pending（重试）"""
        new_task.mark_processing()
        new_task.mark_failed("error", error_info={"error_type": "TimeoutError"})
        assert new_task.retry_count == 0

        new_task.mark_pending_from_failed()

        assert new_task.status == GenerationTaskStatus.PENDING
        assert new_task.retry_count == 1
        assert new_task.error_message == ""
        assert new_task.error_info == {}
        assert new_task.started_at is None
        assert new_task.completed_at is None
        assert new_task.progress == 0.0
        assert new_task.result_count == 0

    def test_failed_to_pending_multiple_retries(self, new_task):
        """测试多次重试"""
        for i in range(3):
            new_task.mark_processing()
            new_task.mark_failed(f"error {i}")
            new_task.mark_pending_from_failed()
        assert new_task.retry_count == 3
        assert new_task.status == GenerationTaskStatus.PENDING

    def test_mark_pending_from_failed_wrong_status(self, new_task):
        """测试非 failed 状态调用 mark_pending_from_failed 报错"""
        with pytest.raises(ValueError, match="只有 failed 状态"):
            new_task.mark_pending_from_failed()  # pending 状态

    # ===== 非法状态转换 =====

    def test_invalid_completed_to_running(self, new_task):
        """测试 completed → running 非法"""
        new_task.mark_processing()
        new_task.mark_completed()
        with pytest.raises(ValueError, match="非法状态转换"):
            new_task.mark_processing()

    def test_invalid_cancelled_to_running(self, new_task):
        """测试 cancelled → running 非法"""
        new_task.mark_cancelled()
        with pytest.raises(ValueError, match="非法状态转换"):
            new_task.mark_processing()

    def test_invalid_completed_to_failed(self, new_task):
        """测试 completed → failed 非法"""
        new_task.mark_processing()
        new_task.mark_completed()
        with pytest.raises(ValueError, match="非法状态转换"):
            new_task.mark_failed("error")

    def test_invalid_status_string(self, new_task):
        """测试无效状态字符串"""
        with pytest.raises(ValueError, match="非法状态转换"):
            new_task.transition_to("invalid_status")


class TestGenerationTaskLogs:
    """日志系统测试"""

    @pytest.fixture
    def new_task(self):
        return GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
        )

    def test_initial_logs_empty(self, new_task):
        """测试初始日志为空"""
        assert new_task.get_logs() == []
        assert new_task.logs == "[]"

    def test_append_log(self, new_task):
        """测试追加日志"""
        new_task.append_log(stage="下载素材", message="开始下载")

        logs = new_task.get_logs()
        assert len(logs) == 1
        assert logs[0]["stage"] == "下载素材"
        assert logs[0]["message"] == "开始下载"
        assert logs[0]["level"] == "INFO"
        assert "ts" in logs[0]

    def test_append_log_with_custom_level(self, new_task):
        """测试带自定义日志级别"""
        new_task.append_log(stage="渲染", message="渲染失败", level="ERROR")

        logs = new_task.get_logs()
        assert logs[0]["level"] == "ERROR"

    def test_append_log_with_extra_fields(self, new_task):
        """测试带额外字段的日志"""
        new_task.append_log(
            stage="下载",
            message="下载完成",
            asset_id="asset-001",
            duration=30.5,
        )

        logs = new_task.get_logs()
        assert logs[0]["asset_id"] == "asset-001"
        assert logs[0]["duration"] == 30.5

    def test_multiple_logs(self, new_task):
        """测试多条日志"""
        new_task.append_log(stage="步骤1", message="开始")
        new_task.append_log(stage="步骤2", message="进行中")
        new_task.append_log(stage="步骤3", message="完成")

        logs = new_task.get_logs()
        assert len(logs) == 3
        assert logs[0]["stage"] == "步骤1"
        assert logs[2]["stage"] == "步骤3"

    def test_logs_corrupted_json(self, new_task):
        """测试 logs 字段损坏时仍能正常工作"""
        new_task.logs = "not valid json {{{"
        logs = new_task.get_logs()
        assert logs == []

        # 追加新日志应该能正常工作
        new_task.append_log(stage="test", message="after corruption")
        logs = new_task.get_logs()
        assert len(logs) == 1
        assert logs[0]["message"] == "after corruption"

    def test_logs_max_limit(self, new_task):
        """测试日志数量上限"""
        for i in range(250):
            new_task.append_log(stage="loop", message=f"log {i}")

        logs = new_task.get_logs()
        assert len(logs) == 200  # _MAX_LOGS
        # 应该保留最近的 200 条
        assert logs[0]["message"] == "log 50"
        assert logs[-1]["message"] == "log 249"

    def test_logs_empty_string(self, new_task):
        """测试 logs 为空字符串时返回空列表"""
        new_task.logs = ""
        assert new_task.get_logs() == []

    def test_append_log_preserves_existing(self, new_task):
        """测试追加日志保留已有日志"""
        new_task.append_log(stage="first", message="first message")
        new_task.append_log(stage="second", message="second message")

        logs = new_task.get_logs()
        assert len(logs) == 2
        assert logs[0]["message"] == "first message"
        assert logs[1]["message"] == "second message"


class TestGenerationTaskTimestamps:
    """时间戳测试"""

    @pytest.fixture
    def new_task(self):
        return GenerationTask.create(
            project_id="proj-123",
            asset_library_id="lib-456",
        )

    def test_created_at_set(self, new_task):
        assert new_task.created_at is not None
        assert isinstance(new_task.created_at, datetime)
        assert new_task.created_at.tzinfo is not None

    def test_mark_processing_sets_started_at(self, new_task):
        assert new_task.started_at is None
        before = datetime.now(timezone.utc)
        time.sleep(0.01)
        new_task.mark_processing()
        time.sleep(0.01)
        after = datetime.now(timezone.utc)
        assert before < new_task.started_at < after

    def test_mark_completed_sets_completed_at(self, new_task):
        new_task.mark_processing()
        assert new_task.completed_at is None
        new_task.mark_completed()
        assert new_task.completed_at is not None

    def test_mark_failed_sets_completed_at(self, new_task):
        new_task.mark_processing()
        assert new_task.completed_at is None
        new_task.mark_failed("error")
        assert new_task.completed_at is not None

    def test_retry_clears_timestamps(self, new_task):
        new_task.mark_processing()
        new_task.mark_failed("error")
        new_task.mark_pending_from_failed()
        assert new_task.started_at is None
        assert new_task.completed_at is None