"""
chunked_upload.py 路由单元测试

覆盖：
- init_chunked_upload 端点正常路径
- init_chunked_upload 项目/素材库不存在时返回 404
- find_by_project 调用正确性
- 文件大小校验
- OSS 凭证校验
"""

from __future__ import annotations

import os
import sys
from pathlib import Path
from unittest.mock import MagicMock

# 设置必要环境变量（必须在导入 app 模块之前）
os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")

import pytest

# 确保 app 模块可导入
sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))

from fastapi import FastAPI
from fastapi.testclient import TestClient

from packages.domain import AssetLibrary, AssetLibraryKind, Project

# ---------------------------------------------------------------------------
# Stub 实现（不继承 Port ABC）
# ---------------------------------------------------------------------------


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

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

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


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

    def find_by_project(self, project_id: str, kind=None) -> list[AssetLibrary]:
        items = [lib for lib in self._libraries.values() if lib.project_id == project_id]
        if kind is not None:
            items = [lib for lib in items if lib.kind == kind]
        return items

    def list_by_project(self, project_id: str) -> list[AssetLibrary]:
        raise AssertionError("路由不应调用 list_by_project，应调用 find_by_project")


class StubChunkedUploadRepository:
    def __init__(self):
        self._uploads = {}

    def add(self, upload) -> None:
        self._uploads[upload.upload_id] = upload

    def get(self, upload_id: str):
        return self._uploads.get(upload_id)

    def update(self, upload) -> None:
        self._uploads[upload.upload_id] = upload

    def find_by_project(self, project_id: str, skip: int = 0, limit: int = 50):
        return [u for u in self._uploads.values() if u.project_id == project_id]

    def count_by_project(self, project_id: str) -> int:
        return len([u for u in self._uploads.values() if u.project_id == project_id])


class StubIngestJobRepository:
    def add(self, job) -> None:
        pass

    def get(self, job_id: str):
        return None

    def update_status(self, job_id, status, **kwargs):
        pass

    def list_by_library(self, library_id: str, skip: int = 0, limit: int = 50):
        return []

    def count_by_library(self, library_id: str) -> int:
        return 0


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


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


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


def _dep(name: str):
    from app import dependencies

    return getattr(dependencies, name)


def _build_app(
    project_repo=None,
    library_repo=None,
    storage=None,
    chunked_repo=None,
    ingest_repo=None,
) -> FastAPI:
    from app.api.routes.chunked_upload import router
    from app.auth import AuthenticatedUser, get_current_user
    from app.core.storage import get_storage_service

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

    project_repo = project_repo or StubProjectRepository()
    library_repo = library_repo or StubAssetLibraryRepository()
    storage = storage or MagicMock()
    storage.is_configured = True
    chunked_repo = chunked_repo or StubChunkedUploadRepository()
    ingest_repo = ingest_repo or StubIngestJobRepository()

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

    app.dependency_overrides[get_current_user] = lambda: mock_user
    app.dependency_overrides[_dep("get_project_repository")] = lambda: project_repo
    app.dependency_overrides[_dep("get_asset_library_repository")] = lambda: library_repo
    app.dependency_overrides[get_storage_service] = lambda: storage
    app.dependency_overrides[_dep("get_ingest_job_repository")] = lambda: ingest_repo

    return app


def _client(**kwargs) -> TestClient:
    return TestClient(_build_app(**kwargs))


# ---------------------------------------------------------------------------
# 测试用例
# ---------------------------------------------------------------------------


class TestInitChunkedUpload:
    """init_chunked_upload 端点测试。"""

    def test_returns_upload_record_on_success(self):
        """正常初始化分片上传。"""
        project = _make_project()
        library = _make_library()
        project_repo = StubProjectRepository({project.id: project})
        library_repo = StubAssetLibraryRepository({library.id: library})

        client = _client(project_repo=project_repo, library_repo=library_repo)

        file_size = 100 * 1024 * 1024  # 100MB
        chunk_size = 5 * 1024 * 1024  # 5MB
        total_chunks = (file_size + chunk_size - 1) // chunk_size

        resp = client.post(
            "/api/v1/init",
            json={
                "project_id": project.id,
                "library_id": library.id,
                "filename": "large-video.mp4",
                "content_type": "video/mp4",
                "file_size": file_size,
                "total_chunks": total_chunks,
            },
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["filename"] == "large-video.mp4"
        assert "upload_id" in data

    def test_returns_404_when_project_not_found(self):
        """项目不存在时返回 404。"""
        library = _make_library()
        library_repo = StubAssetLibraryRepository({library.id: library})

        client = _client(
            project_repo=StubProjectRepository(),
            library_repo=library_repo,
        )

        file_size = 100 * 1024 * 1024
        total_chunks = (file_size + 5 * 1024 * 1024 - 1) // (5 * 1024 * 1024)

        resp = client.post(
            "/api/v1/init",
            json={
                "project_id": "nonexistent",
                "library_id": library.id,
                "filename": "test.mp4",
                "content_type": "video/mp4",
                "file_size": file_size,
                "total_chunks": total_chunks,
            },
        )
        assert resp.status_code == 404
        assert "Project not found" in resp.json()["detail"]

    def test_returns_404_when_library_not_in_project(self):
        """素材库不属于该项目时返回 404。"""
        project = _make_project()
        project_repo = StubProjectRepository({project.id: project})

        # 素材库属于另一个项目
        other_library = _make_library(project_id="other-project")
        library_repo = StubAssetLibraryRepository({other_library.id: other_library})

        client = _client(project_repo=project_repo, library_repo=library_repo)

        file_size = 100 * 1024 * 1024
        total_chunks = (file_size + 5 * 1024 * 1024 - 1) // (5 * 1024 * 1024)

        resp = client.post(
            "/api/v1/init",
            json={
                "project_id": project.id,
                "library_id": "nonexistent-lib",
                "filename": "test.mp4",
                "content_type": "video/mp4",
                "file_size": file_size,
                "total_chunks": total_chunks,
            },
        )
        assert resp.status_code == 404
        assert "Asset library not found" in resp.json()["detail"]

    def test_rejects_file_exceeding_max_size(self):
        """超过 2GB 限制的文件被拒绝（schema 层 le=2GB 会返回 422）。"""
        project = _make_project()
        library = _make_library()
        project_repo = StubProjectRepository({project.id: project})
        library_repo = StubAssetLibraryRepository({library.id: library})

        client = _client(project_repo=project_repo, library_repo=library_repo)

        resp = client.post(
            "/api/v1/init",
            json={
                "project_id": project.id,
                "library_id": library.id,
                "filename": "huge.mp4",
                "content_type": "video/mp4",
                "file_size": 3 * 1024 * 1024 * 1024,  # 3GB，超过 2GB 限制
                "total_chunks": 600,
            },
        )
        # schema le=2147483648 → 422; route-level check → 413
        assert resp.status_code in (400, 413, 422)

    def test_find_by_project_is_called_not_list_by_project(self):
        """验证路由调用 find_by_project 而非 list_by_project。"""
        project = _make_project()
        library = _make_library()
        project_repo = StubProjectRepository({project.id: project})
        library_repo = StubAssetLibraryRepository({library.id: library})

        client = _client(project_repo=project_repo, library_repo=library_repo)

        file_size = 100 * 1024 * 1024
        total_chunks = (file_size + 5 * 1024 * 1024 - 1) // (5 * 1024 * 1024)

        resp = client.post(
            "/api/v1/init",
            json={
                "project_id": project.id,
                "library_id": library.id,
                "filename": "test.mp4",
                "content_type": "video/mp4",
                "file_size": file_size,
                "total_chunks": total_chunks,
            },
        )
        # 如果调用了 list_by_project，StubAssetLibraryRepository 会抛 AssertionError
        assert resp.status_code == 200


class TestChunkedUploadConstants:
    """分片上传常量测试。"""

    def test_max_file_size_is_2gb(self):
        from app.api.routes.chunked_upload import MAX_FILE_SIZE

        assert MAX_FILE_SIZE == 2 * 1024 * 1024 * 1024

    def test_default_chunk_size_is_5mb(self):
        from app.api.routes.chunked_upload import DEFAULT_CHUNK_SIZE

        assert DEFAULT_CHUNK_SIZE == 5 * 1024 * 1024

    def test_chunk_expiry_hours_is_24(self):
        from app.api.routes.chunked_upload import CHUNK_EXPIRY_HOURS

        assert CHUNK_EXPIRY_HOURS == 24