"""Issue #1714：POST /upload/direct/complete 幂等 + multipart 幂等。

覆盖：
- 同 client_upload_id 重复 complete → 只建一条 asset、不重复派 ingest job
- 同 file_hash 重复 complete → 返回已存在记录
- 旧客户端不传 hash/token：近期同库同名 processing 占位 → 兜底幂等返回
- 旧客户端不传 hash/token：READY 历史同名 → 不兜底（正常新建）
- 兜底窗口外（>30 分钟）→ 不兜底
- 旧仓储（无新方法）鸭子类型降级 → 不报错、正常新建
- 重复 complete 时即使 OSS 已无文件（file_exists=False）也返回已存在记录
  （模拟 complete 超时后 OSS 侧对象已过期/清理，重试仍不重复建库）
- multipart 上传：同 client_upload_id 重复提交 → 第二次直接 duplicated，不再传 OSS
"""

from __future__ import annotations

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

os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")

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

from fastapi import FastAPI  # noqa: E402
from fastapi.testclient import TestClient  # noqa: E402

from packages.domain import Asset, AssetLibrary, AssetLibraryKind, AssetStatus, IngestJob, Project  # noqa: E402


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

    def get(self, project_id: str):
        return self._projects.get(project_id)

    def find_by_id(self, project_id: str):
        return self._projects.get(project_id)


class StubAssetLibraryRepository:
    def __init__(self, libraries: dict | None = None):
        self._libraries = libraries or {}

    def find_by_project(self, project_id: str, kind=None) -> list:
        return list(self._libraries.values())


class StubAssetRepository:
    """支持三种幂等查询的内存仓储，并统计 create 次数。"""

    def __init__(self, assets: list[Asset] | None = None):
        self._assets = list(assets or [])
        self.created: list[Asset] = []

    def find_by_library_and_file_hash(self, library_id: str, file_hash: str) -> Asset | None:
        if not file_hash:
            return None
        return next((a for a in self._assets if a.library_id == library_id and a.file_hash == file_hash), None)

    def find_by_library_and_client_upload_id(self, library_id: str, client_upload_id: str) -> Asset | None:
        if not client_upload_id:
            return None
        return next(
            (a for a in self._assets if a.library_id == library_id and a.client_upload_id == client_upload_id),
            None,
        )

    def find_recent_active_by_library_and_name(
        self, library_id: str, name: str, within_minutes: int = 30, file_size: int = 0
    ) -> Asset | None:
        # 严格模式（#1714）：大小未知（0）直接不命中，宁可漏判不可误杀
        if not file_size or file_size <= 0:
            return None
        cutoff = datetime.now(timezone.utc) - timedelta(minutes=within_minutes)
        candidates = [
            a
            for a in self._assets
            if a.library_id == library_id
            and a.name == name
            and a.status in (AssetStatus.UPLOADING, AssetStatus.PROCESSING)
            and a.created_at >= cutoff
            and a.file_size == file_size
        ]
        return max(candidates, key=lambda a: a.created_at) if candidates else None

    def create(self, asset: Asset) -> Asset:
        self._assets.append(asset)
        self.created.append(asset)
        return asset

    def update(self, asset: Asset) -> Asset:
        return asset


class LegacyStubAssetRepository:
    """旧仓储：只有 file_hash 去重，没有新方法（鸭子类型降级验证）。"""

    def __init__(self, assets: list[Asset] | None = None):
        self._assets = list(assets or [])
        self.created: list[Asset] = []

    def find_by_library_and_file_hash(self, library_id: str, file_hash: str) -> Asset | None:
        if not file_hash:
            return None
        return next((a for a in self._assets if a.library_id == library_id and a.file_hash == file_hash), None)

    def create(self, asset: Asset) -> Asset:
        self._assets.append(asset)
        self.created.append(asset)
        return asset


class StubIngestJobRepository:
    def __init__(self):
        self._jobs: dict[str, IngestJob] = {}
        self.created_count = 0

    def create(self, job: IngestJob) -> IngestJob:
        self._jobs[job.id] = job
        self.created_count += 1
        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 _make_project() -> Project:
    return Project(id="proj-1", name="Test Project", owner_user_id="user-1")


def _make_library() -> AssetLibrary:
    return AssetLibrary(id="lib-1", name="Test Library", project_id="proj-1", kind=AssetLibraryKind.VIDEO)


def _build_app(asset_repo=None, ingest_repo=None, storage=None):
    from app.api.routes.upload import router
    from app.auth import AuthenticatedUser, get_current_user
    from app.core.storage import get_storage_service
    from app.dependencies import (
        get_asset_library_repository,
        get_asset_repository,
        get_ingest_job_repository,
        get_project_repository,
    )

    app = FastAPI()
    app.include_router(router, prefix="/api/v1")

    project_repo = StubProjectRepository({"proj-1": _make_project()})
    library_repo = StubAssetLibraryRepository({"lib-1": _make_library()})
    asset_repo = asset_repo or StubAssetRepository()
    ingest_repo = ingest_repo or StubIngestJobRepository()

    storage = storage or MagicMock()
    storage.is_configured = True
    storage._normalize_storage_key = lambda key: key
    storage.file_exists = MagicMock(return_value=True)
    storage.upload_file = MagicMock(return_value="https://oss.example.com/file.mp4")
    storage.get_url = MagicMock(return_value="https://oss.example.com/file.mp4")

    mock_user = MagicMock(spec=AuthenticatedUser)
    mock_user.id = "user-1"
    mock_user.user = MagicMock(id="user-1")
    mock_user.email = "test@example.com"

    app.dependency_overrides[get_current_user] = lambda: mock_user
    app.dependency_overrides[get_project_repository] = lambda: project_repo
    app.dependency_overrides[get_asset_library_repository] = lambda: library_repo
    app.dependency_overrides[get_asset_repository] = lambda: asset_repo
    app.dependency_overrides[get_ingest_job_repository] = lambda: ingest_repo
    app.dependency_overrides[get_storage_service] = lambda: storage
    return app, asset_repo, ingest_repo, storage


def _client(**kwargs):
    app, asset_repo, ingest_repo, storage = _build_app(**kwargs)
    return TestClient(app), asset_repo, ingest_repo, storage


COMPLETE_BODY = {
    "project_id": "proj-1",
    "library_id": "lib-1",
    "storage_key": "uploads/abc/IMG_2282.MOV",
}


class TestDirectCompleteIdempotency:
    def test_same_client_upload_id_creates_single_asset_and_job(self):
        """同一 client_upload_id 连发两次 complete：只建 1 条 asset、1 个 job。"""
        client, asset_repo, ingest_repo, _ = _client()
        body = {**COMPLETE_BODY, "client_upload_id": "up-token-1", "file_size": 12345}

        r1 = client.post("/api/v1/direct/complete", json=body)
        r2 = client.post("/api/v1/direct/complete", json={**body, "storage_key": "uploads/zzz/IMG_2282.MOV"})

        assert r1.status_code == 200 and r2.status_code == 200
        b1, b2 = r1.json(), r2.json()
        assert b1["duplicated"] is False
        assert b2["duplicated"] is True
        assert b1["asset_id"] == b2["asset_id"]
        assert len(asset_repo.created) == 1
        assert ingest_repo.created_count == 1
        # 第二次返回的是已存在记录（其 storage_key 为第一次的 key）
        assert b2["storage_key"] == "uploads/abc/IMG_2282.MOV"

    def test_same_file_hash_returns_existing(self):
        """同 file_hash（不同 token）重复 complete → 返回已存在记录。"""
        client, asset_repo, ingest_repo, _ = _client()
        body1 = {**COMPLETE_BODY, "file_hash": "h" * 32, "client_upload_id": "tok-a"}
        body2 = {
            **COMPLETE_BODY,
            "storage_key": "uploads/def/IMG_2282.MOV",
            "file_hash": "h" * 32,
            "client_upload_id": "tok-b",
        }

        client.post("/api/v1/direct/complete", json=body1)
        r2 = client.post("/api/v1/direct/complete", json=body2)

        assert r2.json()["duplicated"] is True
        assert len(asset_repo.created) == 1
        assert ingest_repo.created_count == 1

    def test_fallback_dedup_when_no_hash_no_token(self):
        """旧客户端不传 hash/token：近期同库同名 processing 占位 → 兜底幂等。

        模拟 complete 超时重试：第一次已建好占位，第二次（OSS 重传拿到新 key）
        不应再建第二条。
        """
        client, asset_repo, ingest_repo, _ = _client()
        # 第一次 complete（旧客户端无 token/hash，但 file_size 可知）
        r1 = client.post(
            "/api/v1/direct/complete",
            json={**COMPLETE_BODY, "file_size": 5_000_000},
        )
        assert r1.json()["duplicated"] is False
        # 重试：重新 prepare 产生新 storage_key（仅 uuid 目录不同，文件名一致——
        # 前端重试传的是同一个 File），且近期；同大小才允许兜底命中
        r2 = client.post(
            "/api/v1/direct/complete",
            json={
                **COMPLETE_BODY,
                "storage_key": "uploads/retry/IMG_2282.MOV",
                "file_size": 5_000_000,
            },
        )
        assert r2.status_code == 200
        assert r2.json()["duplicated"] is True
        assert r2.json()["asset_id"] == r1.json()["asset_id"]
        assert len(asset_repo.created) == 1
        assert ingest_repo.created_count == 1

    def test_fallback_dedup_skipped_when_file_size_unknown(self):
        """file_size=0（未知）时不允许仅凭同名 + processing 判重，直接放行（#1714）。

        根因场景：complete 没传 file_size，30 分钟内同名占位（如 iPhone 的
        IMG_2285.MOV）会把内容/大小全新的视频误判为重复跳过。
        """
        client, asset_repo, _ingest_repo, _ = _client()
        r1 = client.post(
            "/api/v1/direct/complete",
            json={**COMPLETE_BODY, "file_size": 0},
        )
        assert r1.json()["duplicated"] is False
        # 第二个全新视频：同名（IMG_2285.MOV）、无 hash/token、file_size 仍未知
        r2 = client.post(
            "/api/v1/direct/complete",
            json={**COMPLETE_BODY, "storage_key": "uploads/retry2/IMG_2282.MOV", "file_size": 0},
        )
        assert r2.status_code == 200
        assert r2.json()["duplicated"] is False  # 不能误杀
        assert len(asset_repo.created) == 2  # 两条记录，放行新上传

    def test_fallback_dedup_skipped_when_same_name_but_different_size(self):
        """同名但 file_size 不同 → 不判重，正常建记录（#1714）。"""
        client, asset_repo, _ingest_repo, _ = _client()
        r1 = client.post(
            "/api/v1/direct/complete",
            json={**COMPLETE_BODY, "file_size": 5_000_000},
        )
        assert r1.json()["duplicated"] is False
        r2 = client.post(
            "/api/v1/direct/complete",
            json={
                **COMPLETE_BODY,
                "storage_key": "uploads/retry3/IMG_2282.MOV",
                "file_size": 9_999_999,  # 同名但大小完全不同的新视频
            },
        )
        assert r2.status_code == 200
        assert r2.json()["duplicated"] is False
        assert len(asset_repo.created) == 2

    def test_fallback_dedup_skipped_when_hash_present_even_if_name_size_match(self):
        """file_hash 非空且 hash 未命中时，不允许退回同名兜底（#1714）。

        hash 已能代表内容：同名同大小但 hash 不同是真实的新内容，必须放行。
        """
        client, asset_repo, _ingest_repo, _ = _client()
        # 第一次：某 hash 的视频
        r1 = client.post(
            "/api/v1/direct/complete",
            json={
                **COMPLETE_BODY,
                "file_hash": "a" * 64,
                "client_upload_id": "tok-1",
                "file_size": 5_000_000,
            },
        )
        assert r1.json()["duplicated"] is False
        # 第二次：同名同大小但 hash 不同（新视频内容不同）；
        # 注意 client_upload_id 也必须不同，否则会先被 token 命中
        r2 = client.post(
            "/api/v1/direct/complete",
            json={
                **COMPLETE_BODY,
                "storage_key": "uploads/retry4/IMG_2282.MOV",
                "file_hash": "b" * 64,
                "client_upload_id": "tok-2",
                "file_size": 5_000_000,
            },
        )
        assert r2.status_code == 200
        assert r2.json()["duplicated"] is False
        assert len(asset_repo.created) == 2

    def test_fallback_dedup_ignores_ready_history(self):
        """READY 历史同名素材不触发兜底（允许用户再次上传同名文件）。"""
        ready = Asset(
            id="ready-1",
            project_id="proj-1",
            library_id="lib-1",
            name="IMG_2282.MOV",
            storage_key="uploads/old/IMG_2282.MOV",
            mime_type="video/quicktime",
            status=AssetStatus.READY,
        )
        client, asset_repo, ingest_repo, _ = _client(asset_repo=StubAssetRepository([ready]))
        r = client.post("/api/v1/direct/complete", json=COMPLETE_BODY)
        assert r.status_code == 200
        assert r.json()["duplicated"] is False
        assert len(asset_repo.created) == 1

    def test_fallback_dedup_window_expired(self):
        """占位记录超过 30 分钟 → 不再兜底（视为孤儿，正常新建）。"""
        stale = Asset(
            id="stale-1",
            project_id="proj-1",
            library_id="lib-1",
            name="IMG_2282.MOV",
            storage_key="uploads/stale/IMG_2282.MOV",
            mime_type="video/quicktime",
            status=AssetStatus.PROCESSING,
        )
        stale.created_at = datetime.now(timezone.utc) - timedelta(minutes=45)
        client, asset_repo, ingest_repo, _ = _client(asset_repo=StubAssetRepository([stale]))
        r = client.post("/api/v1/direct/complete", json=COMPLETE_BODY)
        assert r.status_code == 200
        assert r.json()["duplicated"] is False
        assert len(asset_repo.created) == 1

    def test_legacy_repo_without_new_methods_still_works(self):
        """旧仓储没有新幂等方法 → 鸭子类型降级，不报错、正常创建。"""
        client, asset_repo, ingest_repo, _ = _client(asset_repo=LegacyStubAssetRepository())
        r = client.post(
            "/api/v1/direct/complete",
            json={**COMPLETE_BODY, "client_upload_id": "tok-x", "file_hash": "f" * 32},
        )
        assert r.status_code == 200
        assert r.json()["duplicated"] is False
        assert len(asset_repo.created) == 1

    def test_duplicate_complete_returns_existing_even_if_oss_missing(self):
        """重复 complete 幂等检查先于 OSS file_exists：

        第一次成功建占位后，重试时即使 OSS 对象已不存在（file_exists=False），
        也必须返回已存在记录而不是 404/重复建库。"""
        client, _, _, storage = _client()
        body = {**COMPLETE_BODY, "client_upload_id": "tok-oss-gone"}
        r1 = client.post("/api/v1/direct/complete", json=body)
        assert r1.status_code == 200

        storage.file_exists = MagicMock(return_value=False)
        r2 = client.post(
            "/api/v1/direct/complete",
            json={**body, "storage_key": "uploads/retry2/IMG_2282.MOV"},
        )
        assert r2.status_code == 200
        assert r2.json()["duplicated"] is True
        assert r2.json()["asset_id"] == r1.json()["asset_id"]


class TestMultipartUploadIdempotency:
    def test_same_client_upload_id_second_submit_deduplicated(self):
        """multipart 重复提交同 token：第二次直接 duplicated，不再上传 OSS。"""
        client, asset_repo, ingest_repo, storage = _client()

        def _post():
            return client.post(
                "/api/v1",
                data={"project_id": "proj-1", "library_id": "lib-1", "client_upload_id": "mp-tok-1"},
                files={"file": ("IMG_2282.MOV", b"fake-mov-data", "video/quicktime")},
            )

        r1 = _post()
        r2 = _post()
        assert r1.json()["duplicated"] is False
        assert r2.json()["duplicated"] is True
        assert r2.json()["asset_id"] == r1.json()["asset_id"]
        assert len(asset_repo.created) == 1
        assert ingest_repo.created_count == 1
        # OSS 上传只发生一次（第二次在幂等检查处直接返回）
        assert storage.upload_file.call_count == 1