"""AI 数字人口型 TTS Celery 异步任务 — 单元测试.

覆盖 lipsync_tts.py 的全部主要分支：
- Job 不存在/cancelled/正常/异常路径
- TTS 合成、音频下载、OSS 上传、MediaKit 提交
- CosyVoiceError/ValueError/MediaKitError/顶层异常等错误码
"""

import os
import sys
import types
from types import ModuleType
from unittest.mock import MagicMock, patch

os.environ.setdefault("JWT_SECRET_KEY", "dev-secret-key-for-testing")


class _FakeQuery:
    """模拟 SQLAlchemy query.filter().first() 链式调用."""

    def __init__(self, job):
        self._job = job

    def filter(self, *args, **kwargs):
        return self

    def first(self):
        return self._job


def _make_fake_job(**kwargs):
    """构造可 setattr 的 job 记录."""
    job = MagicMock()
    job.id = kwargs.get("job_id", "job-1")
    job.user_id = kwargs.get("user_id", "user-1")
    job.status = kwargs.get("status", "tts_processing")
    job.audio_url = kwargs.get("audio_url", "")
    job.video_url = kwargs.get("video_url", "https://oss/video.mp4")
    job.mediakit_task_id = kwargs.get("mediakit_task_id", "")
    job.enable_video_loop = kwargs.get("enable_video_loop", False)
    job.error_code = ""
    job.error_message = ""
    job.submitted_at = None
    job.updated_at = None
    return job


def _build_session(job):
    """构造 mock DB session + factory. 返回 (session, factory)."""
    session = MagicMock()
    session.query.return_value = _FakeQuery(job)
    session.commit = MagicMock()
    session.close = MagicMock()
    factory = MagicMock(return_value=session)
    return session, factory


def _apply_all_patches(
    *,
    job=None,
    cosyvoice_service=None,
    cosyvoice_side_effect=None,
    cosyvoice_error=None,
    download_bytes=b"AUDIO",
    download_error=None,
    storage=None,
    mk_client=None,
    mk_submit_return=None,
    mk_submit_error=None,
):
    """统一构造测试需要的 patch 列表.

    lipsync_tts.run() 在函数体内部懒 import 多个模块，通过 sys.modules 注入
    伪造包路径避免真实导入；对存在的模块用 patch() 替换返回值/side_effect。
    """
    # SessionLocal 通过懒探测获取（Worker 用 worker_app.db，API 用 app.db），
    # 测试环境里两个模块都能被真实导入，必须同时 mock 保证用的是 fake session。
    fake_app_db = ModuleType("app.db")
    fake_worker_db = ModuleType("worker_app.db")
    session, factory = _build_session(job)
    fake_app_db.SessionLocal = factory
    fake_worker_db.SessionLocal = factory

    patches = [
        patch.dict(sys.modules, {"app.db": fake_app_db, "worker_app.db": fake_worker_db}),
        patch(
            "app.tasks.lipsync_tts._sign_media_url",
            side_effect=lambda url: url + "?signed" if url else url,
        ),
    ]

    # CosyVoice
    if cosyvoice_service is not None:
        cosy_instance = cosyvoice_service
    else:
        cosy_instance = MagicMock()
        if cosyvoice_side_effect is not None:
            cosy_instance.submit_synthesize_task.side_effect = cosyvoice_side_effect
        elif cosyvoice_error is not None:
            cosy_instance.submit_synthesize_task.side_effect = cosyvoice_error
        else:
            cosy_instance.submit_synthesize_task.return_value = {"audio_url": "https://tts/raw.mp3"}
    patches.append(patch("packages.application.cosyvoice_service.CosyVoiceService", return_value=cosy_instance))

    # safe_download_bytes
    if download_error is not None:
        patches.append(patch("packages.shared.url_security.safe_download_bytes", side_effect=download_error))
    else:
        patches.append(patch("packages.shared.url_security.safe_download_bytes", return_value=download_bytes))

    # Storage
    if storage is None:
        storage = MagicMock()
        storage.public_url = "https://oss.example.com"
        storage.upload_file.return_value = "https://oss.example.com/tts.mp3"
    patches.append(patch("packages.shared.storage.get_shared_storage_service", return_value=storage))

    # MediaKit client
    if mk_client is not None:
        patches.append(patch("app.services.mediakit_client.get_mediakit_client", return_value=mk_client))
    else:
        client = MagicMock()
        if mk_submit_error is not None:
            client.submit_lipsync.side_effect = mk_submit_error
        else:
            client.submit_lipsync.return_value = mk_submit_return or {"task_id": "mk-1"}
        patches.append(patch("app.services.mediakit_client.get_mediakit_client", return_value=client))

    return session, patches


class TestTtsSynthesizeAndSubmit:
    """测试 Celery 任务 tts_synthesize_and_submit.run 的所有分支."""

    def test_job_not_found_returns_early(self):
        """Job 不存在 → 日志报错直接返回，不抛异常."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        session, patches = _apply_all_patches(job=None)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("missing-job", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        session.commit.assert_not_called()
        session.close.assert_called_once()

    def test_cancelled_job_skipped(self):
        """Job 已 cancelled → 跳过不处理，不调用 TTS/MediaKit."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job(status="cancelled")
        session, patches = _apply_all_patches(job=job)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        # cancelled 不应 commit，不应触发 TTS/MediaKit
        session.commit.assert_not_called()
        session.close.assert_called_once()

    def test_happy_path_tts_to_mediakit(self):
        """完整正常流程：TTS 合成 → OSS 上传 → 签名 → 提交 MediaKit → submitted."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        mk_client = MagicMock()
        mk_client.submit_lipsync.return_value = {"task_id": "mk-999"}
        session, patches = _apply_all_patches(job=job, mk_client=mk_client)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好世界", 1.0, "happy")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        assert job.status == "submitted"
        assert job.mediakit_task_id == "mk-999"
        assert job.error_code == ""
        mk_client.submit_lipsync.assert_called_once()
        call_kwargs = mk_client.submit_lipsync.call_args.kwargs
        assert call_kwargs["client_token"] == "job-1"
        assert call_kwargs["audio_url"].endswith("?signed")
        session.commit.assert_called()
        session.close.assert_called_once()

    def test_cosyvoice_error_marks_tts_synthesis_failed(self):
        """CosyVoiceError → failed, error_code=TTSSynthesisFailed."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        from packages.application.cosyvoice_service import CosyVoiceError

        job = _make_fake_job()
        session, patches = _apply_all_patches(job=job, cosyvoice_error=CosyVoiceError("tts boom"))
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        assert job.status == "failed"
        assert job.error_code == "TTSSynthesisFailed"
        session.close.assert_called_once()

    def test_value_error_marks_tts_invalid_param(self):
        """ValueError（参数错误）→ failed, error_code=TTSInvalidParam."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        session, patches = _apply_all_patches(job=job, cosyvoice_side_effect=ValueError("bad param"))
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", -1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        assert job.status == "failed"
        assert job.error_code == "TTSInvalidParam"
        session.close.assert_called_once()

    def test_no_audio_url_marks_tts_no_audio(self):
        """TTS 返回空 audio_url → failed, error_code=TTSNoAudio."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        cosy = MagicMock()
        cosy.submit_synthesize_task.return_value = {"audio_url": ""}
        session, patches = _apply_all_patches(job=job, cosyvoice_service=cosy)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        assert job.status == "failed"
        assert job.error_code == "TTSNoAudio"
        session.close.assert_called_once()

    def test_oss_upload_failure_falls_back_to_temp_url(self):
        """OSS 上传失败 → 回退临时 URL，仍然 submitted."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        storage = MagicMock()
        storage.public_url = "https://oss.example.com"
        storage.upload_file.side_effect = RuntimeError("oss down")
        mk_client = MagicMock()
        mk_client.submit_lipsync.return_value = {"task_id": "mk-7"}
        session, patches = _apply_all_patches(job=job, storage=storage, mk_client=mk_client)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        # 上传失败后 audio_url 回退为临时 TTS URL，仍继续提交到 MediaKit
        assert job.audio_url == "https://tts/raw.mp3"
        assert job.status == "submitted"
        assert job.mediakit_task_id == "mk-7"
        mk_client.submit_lipsync.assert_called_once()
        session.close.assert_called_once()

    def test_mediakit_error_marks_mediakit_unavailable(self):
        """MediaKit 提交失败 → failed, error_code=MediaKitUnavailable."""
        from app.services.mediakit_client import MediaKitError
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        mk_err = MediaKitError("mk down", code="MediaKitUnavailable")
        session, patches = _apply_all_patches(job=job, mk_submit_error=mk_err)
        entered = [p.__enter__() for p in patches]
        try:
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")
        finally:
            for p in reversed(patches):
                p.__exit__(None, None, None)

        assert job.status == "failed"
        assert job.error_code == "MediaKitUnavailable"
        session.close.assert_called_once()

    def test_top_level_exception_marks_async_task_error(self):
        """顶层未预期异常 → failed, error_code=AsyncTaskError."""
        from app.tasks.lipsync_tts import tts_synthesize_and_submit

        job = _make_fake_job()
        fake_app_db = ModuleType("app.db")
        fake_worker_db = ModuleType("worker_app.db")
        session, factory = _build_session(job)
        fake_app_db.SessionLocal = factory
        fake_worker_db.SessionLocal = factory

        # CosyVoiceService 在 __init__ 抛 RuntimeError（非 CosyVoiceError/ValueError）
        fake_cosy_mod = ModuleType("packages.application.cosyvoice_service")

        class _CosyVoiceErrorForTest(Exception):
            pass

        class _BoomService:
            def __init__(self):
                raise RuntimeError("top-level boom")

        fake_cosy_mod.CosyVoiceError = _CosyVoiceErrorForTest
        fake_cosy_mod.CosyVoiceService = _BoomService

        with patch.dict(
            sys.modules,
            {
                "app.db": fake_app_db,
                "worker_app.db": fake_worker_db,
                "packages.application.cosyvoice_service": fake_cosy_mod,
            },
        ):
            tts_synthesize_and_submit.run("job-1", "user-1", "v1", "你好", 1.0, "")

        assert job.status == "failed"
        assert job.error_code == "AsyncTaskError"
        session.close.assert_called()


class TestSignMediaUrl:
    """覆盖模块内 _sign_media_url 的所有分支（CI 增量覆盖率需要）."""

    def test_empty_url_returns_empty(self):
        from app.tasks.lipsync_tts import _sign_media_url

        assert _sign_media_url("") == ""
        assert _sign_media_url(None) is None

    def test_own_oss_url_signed(self):
        """自家 OSS URL → 调用 storage.get_download_url 签名."""
        from app.tasks.lipsync_tts import _sign_media_url

        fake_storage = MagicMock()
        fake_storage.public_url = "https://oss.example.com/"
        fake_storage.get_download_url.return_value = "https://oss.example.com/a?sig=xyz"

        with patch("packages.shared.storage.get_shared_storage_service", return_value=fake_storage):
            result = _sign_media_url("https://oss.example.com/lipsync/a.mp3")

        assert result == "https://oss.example.com/a?sig=xyz"
        fake_storage.get_download_url.assert_called_once()

    def test_external_url_passthrough(self):
        """外部 URL（不是自家 OSS host）→ 原样透传，不签名."""
        from app.tasks.lipsync_tts import _sign_media_url

        fake_storage = MagicMock()
        fake_storage.public_url = "https://oss.example.com/"

        with patch("packages.shared.storage.get_shared_storage_service", return_value=fake_storage):
            result = _sign_media_url("https://tts.example.com/raw.mp3")

        assert result == "https://tts.example.com/raw.mp3"
        fake_storage.get_download_url.assert_not_called()

    def test_storage_exception_falls_back(self):
        """storage 调用异常 → 降级原样返回，不抛错."""
        from app.tasks.lipsync_tts import _sign_media_url

        with patch(
            "packages.shared.storage.get_shared_storage_service",
            side_effect=RuntimeError("storage down"),
        ):
            result = _sign_media_url("https://oss.example.com/a.mp3")

        assert result == "https://oss.example.com/a.mp3"

    def test_no_public_url_passthrough(self):
        """storage.public_url 为空 → 原样透传."""
        from app.tasks.lipsync_tts import _sign_media_url

        fake_storage = MagicMock()
        fake_storage.public_url = ""

        with patch("packages.shared.storage.get_shared_storage_service", return_value=fake_storage):
            result = _sign_media_url("https://anything.example.com/a.mp3")

        assert result == "https://anything.example.com/a.mp3"
        fake_storage.get_download_url.assert_not_called()