import os
import unittest
from unittest.mock import Mock, patch

from api.routers.chapters import _chapter_to_dict


class ChaptersRouterImagesTest(unittest.TestCase):
    @patch("api.routers.chapters.TencentCosStorageService")
    @patch.dict(
        os.environ,
        {
            "TENCENT_COS_BUCKET": "life-echo-dev-1319381411",
            "TENCENT_COS_REGION": "ap-shanghai",
            "TENCENT_COS_BASE_URL": "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com",
        },
        clear=False,
    )
    def test_chapter_to_dict_returns_signed_image_urls_for_response(self, storage_cls):
        storage = Mock()
        storage.get_download_url.return_value = "https://signed.example.com/memoirs/u1/c1/0-demo.png?sig=123"
        storage_cls.from_env.return_value = storage

        chapter = type(
            "ChapterStub",
            (),
            {
                "id": "chapter-1",
                "title": "童年的夏天",
                "content": "{{IMAGE:南方小镇的青石板路}}",
                "order_index": 0,
                "status": "completed",
                "category": "childhood",
                "images": [
                    {
                        "index": 0,
                        "placeholder": "{{IMAGE:南方小镇的青石板路}}",
                        "description": "南方小镇的青石板路",
                        "status": "completed",
                        "prompt": "A serene southern China town",
                        "url": "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com/memoirs/u1/c1/0-demo.png",
                        "storage_key": "memoirs/u1/c1/0-demo.png",
                    }
                ],
                "updated_at": None,
                "is_new": False,
                "source_segments": [],
            },
        )()

        payload = _chapter_to_dict(chapter)

        self.assertEqual(
            payload["images"][0]["url"],
            "https://signed.example.com/memoirs/u1/c1/0-demo.png?sig=123",
        )
        self.assertEqual(payload["images"][0]["prompt"], "A serene southern China town")
        self.assertNotIn("storage_key", payload["images"][0])

    @patch("api.routers.chapters.TencentCosStorageService")
    @patch.dict(
        os.environ,
        {
            "TENCENT_COS_BUCKET": "life-echo-dev-1319381411",
            "TENCENT_COS_REGION": "ap-shanghai",
            "TENCENT_COS_BASE_URL": "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com",
        },
        clear=False,
    )
    def test_chapter_to_dict_preserves_completed_asset_when_signing_fails(self, storage_cls):
        storage = Mock()
        storage.get_download_url.side_effect = RuntimeError("cos unavailable")
        storage_cls.from_env.return_value = storage

        chapter = type(
            "ChapterStub",
            (),
            {
                "id": "chapter-1",
                "title": "童年的夏天",
                "content": "{{IMAGE:南方小镇的青石板路}}",
                "order_index": 0,
                "status": "completed",
                "category": "childhood",
                "images": [
                    {
                        "index": 0,
                        "placeholder": "{{IMAGE:南方小镇的青石板路}}",
                        "description": "南方小镇的青石板路",
                        "status": "completed",
                        "prompt": "A serene southern China town",
                        "url": "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com/memoirs/u1/c1/0-demo.png",
                        "storage_key": "memoirs/u1/c1/0-demo.png",
                    }
                ],
                "updated_at": None,
                "is_new": False,
                "source_segments": [],
            },
        )()

        payload = _chapter_to_dict(chapter)

        self.assertEqual(payload["images"][0]["status"], "completed")
        self.assertEqual(
            payload["images"][0]["url"],
            "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com/memoirs/u1/c1/0-demo.png",
        )
        self.assertEqual(payload["images"][0]["prompt"], "A serene southern China town")
        self.assertNotIn("storage_key", payload["images"][0])

    @patch("api.routers.chapters.TencentCosStorageService")
    def test_chapter_to_dict_drops_malformed_image_assets(self, storage_cls):
        storage_cls.from_env.return_value = Mock()

        chapter = type(
            "ChapterStub",
            (),
            {
                "id": "chapter-1",
                "title": "童年的夏天",
                "content": "{{IMAGE:南方小镇的青石板路}}",
                "order_index": 0,
                "status": "completed",
                "category": "childhood",
                "images": [
                    {
                        "index": 0,
                        "status": "completed",
                    }
                ],
                "updated_at": None,
                "is_new": False,
                "source_segments": [],
            },
        )()

        payload = _chapter_to_dict(chapter)

        self.assertEqual(payload["images"], [])

    @patch("api.routers.chapters.TencentCosStorageService")
    @patch.dict(os.environ, {"MEMOIR_IMAGE_ENABLED": "false"}, clear=False)
    def test_chapter_to_dict_hides_non_completed_assets_when_feature_disabled(self, storage_cls):
        storage = Mock()
        storage.get_download_url.return_value = "https://signed.example.com/0.png?sig=123"
        storage_cls.from_env.return_value = storage

        chapter = type(
            "ChapterStub",
            (),
            {
                "id": "chapter-1",
                "title": "童年的夏天",
                "content": "{{IMAGE:南方小镇的青石板路}}",
                "order_index": 0,
                "status": "completed",
                "category": "childhood",
                "images": [
                    {
                        "index": 0,
                        "placeholder": "{{IMAGE:南方小镇的青石板路}}",
                        "description": "南方小镇的青石板路",
                        "status": "pending",
                        "url": None,
                    },
                    {
                        "index": 1,
                        "placeholder": "{{IMAGE:奶奶坐在院子里的藤椅上}}",
                        "description": "奶奶坐在院子里的藤椅上",
                        "status": "completed",
                        "url": "https://life-echo-dev-1319381411.cos.ap-shanghai.myqcloud.com/memoirs/u1/c1/1-demo.png",
                        "storage_key": "memoirs/u1/c1/1-demo.png",
                    },
                ],
                "updated_at": None,
                "is_new": False,
                "source_segments": [],
            },
        )()

        payload = _chapter_to_dict(chapter)

        self.assertEqual(len(payload["images"]), 1)
        self.assertEqual(payload["images"][0]["status"], "completed")