"""
任务中心 API 集成测试

覆盖端点：
- GET  /tasks — 列出用户任务
- POST /tasks/{task_id}/retry — 重试用户任务
- GET  /projects/{project_id}/tasks — 列出项目任务
- POST /tasks/{task_type}/{source_id}/retry — 重试项目任务

使用 FastAPI TestClient + dependency_overrides 模式，
导入真实模块，mock 外部依赖（Celery任务）。
"""

from __future__ import annotations

import os
import sys
from datetime import datetime, timezone
from pathlib import Path
from unittest.mock import MagicMock, patch

# ── 环境变量 & sys.path（必须在导入 app.* 之前设置） ──────────────────────────
os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))

from app.api.routes.task_center import router
from app.auth import AuthenticatedUser, get_current_user
from app.dependencies import (
    get_generation_task_repository,
    get_ingest_job_repository,
    get_project_repository,
)

from packages.domain import (
    GenerationTask,
    GenerationTaskStatus,
    IngestJob,
    IngestJobStatus,
    Project,
    User,
)

# ---------------------------------------------------------------------------
# 1. Stub Repository 实现
# ---------------------------------------------------------------------------


class StubProjectRepository:
    def __init__(self, projects: dict[str, Project] | None = None):
        self._projects = projects or {}

    def find_by_id(self, project_id: str) -> Project | None:
        return self._projects.get(project_id)


class StubGenerationTaskRepository:
    def __init__(self, tasks: dict[str, GenerationTask] | None = None):
        self._tasks = tasks or {}

    def create(self, task: GenerationTask) -> GenerationTask:
        self._tasks[task.id] = task
        return task

    def get(self, task_id: str) -> GenerationTask | None:
        return self._tasks.get(task_id)

    def list_by_project(self, project_id: str) -> list[GenerationTask]:
        return [t for t in self._tasks.values() if t.project_id == project_id]

    def list_by_user(self, user_id: str) -> list[GenerationTask]:
        return [t for t in self._tasks.values() if t.created_by_user_id == user_id]

    def update(self, task: GenerationTask) -> GenerationTask:
        self._tasks[task.id] = task
        return task

    def count_by_user(self, user_id: str) -> int:
        return len([t for t in self._tasks.values() if t.created_by_user_id == user_id])

    def count_pending_by_user(self, user_id: str) -> int:
        return len(
            [
                t
                for t in self._tasks.values()
                if t.created_by_user_id == user_id and t.status == GenerationTaskStatus.PENDING
            ]
        )

    def count_pending_total(self) -> int:
        return len([t for t in self._tasks.values() if t.status == GenerationTaskStatus.PENDING])

    def list_recent_by_user(self, user_id: str, limit: int = 5) -> list[GenerationTask]:
        items = [t for t in self._tasks.values() if t.created_by_user_id == user_id]
        items.sort(key=lambda t: t.created_at, reverse=True)
        return items[:limit]

    def list_by_source_edit_plan(self, plan_id: str) -> list[GenerationTask]:
        return [t for t in self._tasks.values() if getattr(t, "source_edit_plan_id", "") == plan_id]

    def list_by_user_filtered(
        self,
        user_id: str,
        *,
        status: str | None = None,
        limit: int | None = None,
        offset: int = 0,
    ) -> list:
        """按用户+状态筛选任务列表（stub实现）。"""
        items = [t for t in self._tasks.values() if t.created_by_user_id == user_id]
        if status:
            items = [t for t in items if str(t.status) == status]
        # 按创建时间倒序
        items.sort(key=lambda t: t.created_at or "", reverse=True)
        if offset:
            items = items[offset:]
        if limit is not None:
            items = items[:limit]
        return items

    def count_by_user_filtered(
        self,
        user_id: str,
        *,
        status: str | None = None,
    ) -> int:
        """按用户+状态筛选计数（stub实现）。"""
        items = [t for t in self._tasks.values() if t.created_by_user_id == user_id]
        if status:
            items = [t for t in items if str(t.status) == status]
        return len(items)

    def list_by_project_filtered(
        self,
        project_id: str,
        *,
        status: str | None = None,
        limit: int | None = None,
        offset: int = 0,
    ) -> list:
        """按项目+状态筛选任务列表（stub实现）。"""
        items = [t for t in self._tasks.values() if t.project_id == project_id]
        if status:
            items = [t for t in items if str(t.status) == status]
        # 按创建时间倒序
        items.sort(key=lambda t: t.created_at or "", reverse=True)
        if offset:
            items = items[offset:]
        if limit is not None:
            items = items[:limit]
        return items

    def count_by_project_filtered(
        self,
        project_id: str,
        *,
        status: str | None = None,
    ) -> int:
        """按项目+状态筛选计数（stub实现）。"""
        items = [t for t in self._tasks.values() if t.project_id == project_id]
        if status:
            items = [t for t in items if str(t.status) == status]
        return len(items)


class StubIngestJobRepository:
    def __init__(self, jobs: dict[str, IngestJob] | None = None):
        self._jobs = jobs or {}

    def create(self, job: IngestJob) -> IngestJob:
        self._jobs[job.id] = job
        return job

    def get(self, job_id: str) -> IngestJob | None:
        return self._jobs.get(job_id)

    def update(self, job: IngestJob) -> IngestJob:
        self._jobs[job.id] = job
        return job

    def update_status(self, job_id: str, status, **kwargs):
        job = self._jobs.get(job_id)
        if job:
            job.status = status

    def list_by_project(self, project_id: str, skip: int = 0, limit: int = 50) -> list[IngestJob]:
        return [j for j in self._jobs.values() if j.project_id == project_id][skip : skip + limit]

    def list_by_library(self, library_id: str, skip: int = 0, limit: int = 50) -> list[IngestJob]:
        return [j for j in self._jobs.values() if j.library_id == library_id][skip : skip + limit]


# ---------------------------------------------------------------------------
# 2. Helpers & Fixtures
# ---------------------------------------------------------------------------


def _make_user(**overrides) -> User:
    defaults = dict(
        id="user-test-001",
        email="test@example.com",
        display_name="Test User",
        username="testuser",
        subscription_plan="free",
        subscription_status="active",
        max_projects=3,
        max_storage_gb=10,
        created_at=datetime(2026, 1, 1, tzinfo=timezone.utc),
    )
    defaults.update(overrides)
    return User(**defaults)


def _make_project(id: str = "proj-1", owner_user_id: str = "user-test-001") -> Project:
    return Project(id=id, name="Test Project", owner_user_id=owner_user_id)


def _make_generation_task(
    task_id: str = "gen-task-1",
    project_id: str = "proj-1",
    user_id: str = "user-test-001",
    status: GenerationTaskStatus = GenerationTaskStatus.PENDING,
) -> GenerationTask:
    task = GenerationTask(
        id=task_id,
        project_id=project_id,
        asset_library_id="lib-1",
        strategy_id="s1",
        voice_library_id="v1",
        created_by_user_id=user_id,
    )
    task.status = status
    return task


def _make_ingest_job(
    job_id: str = "ingest-job-1",
    project_id: str = "proj-1",
    library_id: str = "lib-1",
    status: IngestJobStatus = IngestJobStatus.PENDING,
) -> IngestJob:
    job = IngestJob(
        id=job_id,
        project_id=project_id,
        library_id=library_id,
        storage_key="uploads/test.mp4",
    )
    job.status = status
    return job


@pytest.fixture
def client():
    """创建带有依赖覆盖的 TestClient。"""
    test_app = FastAPI()
    test_app.include_router(router)

    project = _make_project()
    project_repo = StubProjectRepository({project.id: project})
    task_repo = StubGenerationTaskRepository()
    ingest_repo = StubIngestJobRepository()

    def _override_current_user():
        mock_auth = MagicMock(spec=AuthenticatedUser)
        mock_auth.user = _make_user()
        return mock_auth

    test_app.dependency_overrides[get_current_user] = _override_current_user
    test_app.dependency_overrides[get_project_repository] = lambda: project_repo
    test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
    test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

    yield TestClient(test_app)

    test_app.dependency_overrides.clear()


# ---------------------------------------------------------------------------
# 3. GET /tasks — 列出用户任务
# ---------------------------------------------------------------------------


class TestListUserTasks:
    """列出用户任务端点测试。"""

    def test_empty_list(self, client):
        """无任务时返回空列表。"""
        resp = client.get("/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert "items" in data
        assert data["items"] == []

    def test_list_returns_generation_tasks(self, client):
        """返回当前用户的 generation 任务。"""
        # 直接在 repository 中注入任务
        from app.dependencies import get_generation_task_repository

        task_repo = StubGenerationTaskRepository()
        task1 = _make_generation_task("gen-1", status=GenerationTaskStatus.PENDING)
        task2 = _make_generation_task("gen-2", status=GenerationTaskStatus.COMPLETED)
        task_repo.create(task1)
        task_repo.create(task2)

        test_app = FastAPI()
        test_app.include_router(router)

        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _override_current_user():
            mock_auth = MagicMock(spec=AuthenticatedUser)
            mock_auth.user = _make_user()
            return mock_auth

        test_app.dependency_overrides[get_current_user] = _override_current_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: StubIngestJobRepository()

        tc = TestClient(test_app)
        resp = tc.get("/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert len(data["items"]) == 2
        # 验证响应字段
        for item in data["items"]:
            assert "id" in item
            assert "task_type" in item
            assert item["task_type"] == "generation"
            assert "status" in item
            assert "current_step" in item
            assert "retryable" in item

        test_app.dependency_overrides.clear()

    def test_tasks_sorted_by_updated_time(self, client):
        """任务按更新时间倒序排列。"""
        # 由于两个任务同时创建，验证它们都出现在列表中
        resp = client.get("/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert isinstance(data["items"], list)

    def test_task_response_fields(self, client):
        """任务响应包含所有必需字段。"""
        resp = client.get("/tasks")
        assert resp.status_code == 200
        # 空列表也应该返回正确的结构
        assert resp.json()["items"] == []


# ---------------------------------------------------------------------------
# 4. POST /tasks/{task_id}/retry — 重试用户任务
# ---------------------------------------------------------------------------


class TestRetryUserTask:
    """重试用户任务端点测试。"""

    def test_retry_nonexistent_task_returns_404(self, client):
        """重试不存在的任务返回 404。"""
        resp = client.post("/tasks/nonexistent-task-id/retry")
        assert resp.status_code == 404
        assert "not found" in resp.json()["detail"].lower()

    @patch("app.api.routes.task_center.celery_app")
    def test_retry_pending_task_returns_409(self, mock_celery, client):
        """重试 pending 状态的任务返回 409（只有 failed 任务才能重试）。"""
        mock_celery.send_task = MagicMock()

        # 在 repository 中创建一个 pending 任务
        task_repo = StubGenerationTaskRepository()
        task = _make_generation_task("gen-pending", status=GenerationTaskStatus.PENDING)
        task_repo.create(task)

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: StubIngestJobRepository()

        tc = TestClient(test_app)
        resp = tc.post("/tasks/gen-pending/retry")
        assert resp.status_code == 409
        assert "Only failed" in resp.json()["detail"]

        test_app.dependency_overrides.clear()

    @patch("app.api.routes.task_center.celery_app")
    def test_retry_completed_task_returns_409(self, mock_celery, client):
        """重试 completed 状态的任务返回 409。"""
        mock_celery.send_task = MagicMock()

        task_repo = StubGenerationTaskRepository()
        task = _make_generation_task("gen-completed", status=GenerationTaskStatus.COMPLETED)
        task_repo.create(task)

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: StubIngestJobRepository()

        tc = TestClient(test_app)
        resp = tc.post("/tasks/gen-completed/retry")
        assert resp.status_code == 409

        test_app.dependency_overrides.clear()


# ---------------------------------------------------------------------------
# 5. GET /projects/{project_id}/tasks — 列出项目任务
# ---------------------------------------------------------------------------


class TestListProjectTasks:
    """列出项目任务端点测试。"""

    def test_empty_project_tasks(self, client):
        """项目无任务时返回空列表。"""
        resp = client.get("/projects/proj-1/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert "items" in data
        assert data["items"] == []

    def test_project_not_found(self, client):
        """项目不存在返回 404。"""
        resp = client.get("/projects/nonexistent-project/tasks")
        assert resp.status_code == 404
        assert "Project not found" in resp.json()["detail"]

    def test_returns_ingest_and_generation_tasks(self, client):
        """返回项目中 ingest 和 generation 两种任务。"""
        # 在 repository 中注入任务
        task_repo = StubGenerationTaskRepository()
        gen_task = _make_generation_task("gen-proj-1", status=GenerationTaskStatus.PENDING)
        task_repo.create(gen_task)

        ingest_repo = StubIngestJobRepository()
        ingest_job = _make_ingest_job("ingest-proj-1", status=IngestJobStatus.PENDING)
        ingest_repo.create(ingest_job)

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.get("/projects/proj-1/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert len(data["items"]) == 2

        task_types = {item["task_type"] for item in data["items"]}
        assert "generation" in task_types
        assert "ingest" in task_types

        test_app.dependency_overrides.clear()

    def test_project_task_response_fields(self, client):
        """项目任务响应包含所有必需字段。"""
        resp = client.get("/projects/proj-1/tasks")
        assert resp.status_code == 200
        data = resp.json()
        assert isinstance(data["items"], list)


# ---------------------------------------------------------------------------
# 6. POST /tasks/{task_type}/{source_id}/retry — 重试项目任务
# ---------------------------------------------------------------------------


class TestRetryProjectTask:
    """重试项目任务端点测试。"""

    def test_retry_unsupported_task_type_returns_400(self, client):
        """不支持的任务类型返回 400。"""
        resp = client.post("/tasks/unknown/some-source-id/retry")
        assert resp.status_code == 400
        assert "Unsupported" in resp.json()["detail"]

    @patch("app.core.task_enqueue.celery_app")
    def test_retry_failed_generation_task(self, mock_celery, client):
        """重试失败的 generation 任务成功。"""
        mock_celery.send_task = MagicMock()

        task_repo = StubGenerationTaskRepository()
        task = _make_generation_task("gen-failed-1", status=GenerationTaskStatus.FAILED)
        task_repo.create(task)

        ingest_repo = StubIngestJobRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.post("/tasks/generation/gen-failed-1/retry")
        assert resp.status_code == 200
        data = resp.json()
        assert data["task_type"] == "generation"
        assert data["status"] == "pending"
        assert "current_step" in data
        # 原地重试：source_id 保持不变（复用同一个任务）
        assert data["source_id"] == "gen-failed-1"
        # 验证 Celery 任务被发送
        assert mock_celery.send_task.called

        test_app.dependency_overrides.clear()

    @patch("app.api.routes.task_center.celery_app")
    def test_retry_failed_ingest_task(self, mock_celery, client):
        """重试失败的 ingest 任务成功。"""
        mock_celery.send_task = MagicMock()

        ingest_repo = StubIngestJobRepository()
        job = _make_ingest_job("ingest-failed-1", status=IngestJobStatus.FAILED)
        ingest_repo.create(job)

        task_repo = StubGenerationTaskRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.post("/tasks/ingest/ingest-failed-1/retry")
        assert resp.status_code == 200
        data = resp.json()
        assert data["task_type"] == "ingest"
        assert data["status"] == "pending"
        assert mock_celery.send_task.called
        assert mock_celery.send_task.call_args[0][0] == "worker.ingest_asset"

        test_app.dependency_overrides.clear()

    def test_retry_pending_generation_task_returns_409(self, client):
        """重试 pending 状态的 generation 任务返回 409。"""
        task_repo = StubGenerationTaskRepository()
        task = _make_generation_task("gen-pending-proj", status=GenerationTaskStatus.PENDING)
        task_repo.create(task)

        ingest_repo = StubIngestJobRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.post("/tasks/generation/gen-pending-proj/retry")
        assert resp.status_code == 409
        assert "Only failed" in resp.json()["detail"]

        test_app.dependency_overrides.clear()

    def test_retry_nonexistent_generation_task_returns_404(self, client):
        """重试不存在的 generation 任务返回 404。"""
        task_repo = StubGenerationTaskRepository()
        ingest_repo = StubIngestJobRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.post("/tasks/generation/nonexistent-id/retry")
        assert resp.status_code == 404

        test_app.dependency_overrides.clear()

    def test_retry_nonexistent_ingest_task_returns_404(self, client):
        """重试不存在的 ingest 任务返回 404。"""
        task_repo = StubGenerationTaskRepository()
        ingest_repo = StubIngestJobRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)
        resp = tc.post("/tasks/ingest/nonexistent-id/retry")
        assert resp.status_code == 404

        test_app.dependency_overrides.clear()


# ---------------------------------------------------------------------------
# 7. 跨端点集成场景
# ---------------------------------------------------------------------------


class TestTaskCenterCrossEndpoint:
    """任务中心跨端点集成测试。"""

    @patch("app.core.task_enqueue.celery_app")
    def test_list_then_retry_then_list(self, mock_celery, client):
        """列出任务 → 重试失败任务 → 再列出验证新任务。"""
        mock_celery.send_task = MagicMock()

        task_repo = StubGenerationTaskRepository()
        failed_task = _make_generation_task("gen-fail-cross", status=GenerationTaskStatus.FAILED)
        failed_task.error_message = "ffmpeg error"
        task_repo.create(failed_task)

        ingest_repo = StubIngestJobRepository()

        test_app = FastAPI()
        test_app.include_router(router)
        project_repo = StubProjectRepository({_make_project().id: _make_project()})

        def _get_user():
            return MagicMock(spec=AuthenticatedUser, user=_make_user())

        test_app.dependency_overrides[get_current_user] = _get_user
        test_app.dependency_overrides[get_project_repository] = lambda: project_repo
        test_app.dependency_overrides[get_generation_task_repository] = lambda: task_repo
        test_app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo

        tc = TestClient(test_app)

        # 1. 列出任务
        list_resp = tc.get("/tasks")
        assert list_resp.status_code == 200
        items = list_resp.json()["items"]
        assert len(items) == 1
        assert items[0]["retryable"] is True  # failed 任务应可重试

        # 2. 重试失败任务
        retry_resp = tc.post("/tasks/gen-fail-cross/retry")
        assert retry_resp.status_code == 200

        # 3. 再次列出：原地重试，任务数不变（仍是1个），但状态变为 pending
        list_resp2 = tc.get("/tasks")
        assert list_resp2.status_code == 200
        items2 = list_resp2.json()["items"]
        assert len(items2) == 1
        assert items2[0]["status"] == "pending"
        assert items2[0]["source_id"] == "gen-fail-cross"

        test_app.dependency_overrides.clear()


if __name__ == "__main__":
    pytest.main([__file__, "-v"])