import unittest
from types import SimpleNamespace
import inspect


class FakeResponse:
    def __init__(self, payload):
        self.payload = payload

    def raise_for_status(self):
        return None

    def json(self):
        return self.payload


class DeferredSongInfoTests(unittest.TestCase):
    def test_deferred_module_avoids_py39_str_prefix_suffix_methods(self):
        import musicdl.catalogsync.deferred as deferred

        source = inspect.getsource(deferred)
        self.assertNotIn(".removesuffix(", source)
        self.assertNotIn(".removeprefix(", source)

    def test_extract_playlist_id_from_html_path(self):
        from musicdl.catalogsync.deferred import _extract_playlist_id_from_url

        playlist_id = _extract_playlist_id_from_url("https://www.kuwo.cn/playlist_detail/3671258656.html")

        self.assertEqual("3671258656", playlist_id)

    def test_build_kuwo_raw_track_song_infos_strips_music_prefix(self):
        from musicdl.catalogsync.deferred import build_kuwo_raw_track_song_infos

        client = SimpleNamespace(
            source="KuwoMusicClient",
            _constructuniqueworkdir=lambda keyword: f"/tmp/{keyword}",
            _removeduplicates=lambda song_infos: list(song_infos),
        )
        song_infos = build_kuwo_raw_track_song_infos(
            client,
            raw_tracks=[
                {
                    "MUSICRID": "MUSIC_123456",
                    "SONGNAME": "Song A",
                    "ARTIST": "Singer A",
                    "ALBUM": "Album A",
                    "DURATION": 180,
                }
            ],
            playlist_name="Kuwo Playlist",
        )

        self.assertEqual(1, len(song_infos))
        self.assertEqual("123456", song_infos[0].identifier)

    def test_build_deferred_song_info_marks_snapshot_as_deferred(self):
        from musicdl.catalogsync.deferred import build_deferred_song_info

        song_info = build_deferred_song_info(
            source="NeteaseMusicClient",
            raw_search_result={"id": 101, "name": "Song A"},
            identifier="101",
            song_name="Song A",
            singers="Singer A",
            album="Album A",
            duration_s=215,
            cover_url="https://example.com/a.jpg",
            ext="flac",
        )

        self.assertEqual("NeteaseMusicClient", song_info.source)
        self.assertEqual("101", song_info.identifier)
        self.assertEqual("Song A", song_info.song_name)
        self.assertEqual("Singer A", song_info.singers)
        self.assertEqual("Album A", song_info.album)
        self.assertEqual("flac", song_info.ext)
        self.assertFalse(song_info.with_valid_download_url)
        self.assertTrue(song_info.raw_data["deferred_search"])
        self.assertEqual(101, song_info.raw_data["search"]["id"])

    def test_build_netease_playlist_song_infos_fetches_missing_track_details(self):
        from musicdl.catalogsync.deferred import build_netease_playlist_song_infos

        class FakeClient:
            source = "NeteaseMusicClient"

            def __init__(self):
                self.calls = []

            def post(self, url, data=None, **kwargs):
                self.calls.append((url, data))
                if url.endswith("/api/v6/playlist/detail"):
                    return FakeResponse(
                        {
                            "playlist": {
                                "name": "Test Playlist",
                                "trackIds": [{"id": 101}, {"id": 102}],
                                "tracks": [
                                    {
                                        "id": 101,
                                        "name": "Song A",
                                        "dt": 215000,
                                        "ar": [{"name": "Singer A"}],
                                        "al": {"name": "Album A", "picUrl": "https://example.com/a.jpg"},
                                        "sq": {"size": 1},
                                    }
                                ],
                            }
                        }
                    )
                if url.endswith("/api/v3/song/detail"):
                    return FakeResponse(
                        {
                            "songs": [
                                {
                                    "id": 102,
                                    "name": "Song B",
                                    "dt": 186000,
                                    "ar": [{"name": "Singer B"}],
                                    "al": {"name": "Album B", "picUrl": "https://example.com/b.jpg"},
                                    "h": {"size": 1},
                                }
                            ]
                        }
                    )
                raise AssertionError(f"Unexpected URL: {url}")

            def _constructuniqueworkdir(self, keyword):
                return f"/tmp/{keyword}"

            def _removeduplicates(self, song_infos):
                return list(song_infos)

        client = FakeClient()
        song_infos = build_netease_playlist_song_infos(client, "https://music.163.com/#/playlist?id=999")

        self.assertEqual(2, len(song_infos))
        self.assertEqual(["101", "102"], [song_info.identifier for song_info in song_infos])
        self.assertEqual(["Song A", "Song B"], [song_info.song_name for song_info in song_infos])
        self.assertTrue(all(song_info.raw_data["deferred_search"] for song_info in song_infos))
        self.assertEqual("flac", song_infos[0].ext)
        self.assertEqual("mp3", song_infos[1].ext)
        self.assertTrue(any(url.endswith("/api/v3/song/detail") for url, _ in client.calls))

    def test_build_qq_raw_track_song_infos_keeps_tracks_without_direct_download_urls(self):
        from musicdl.catalogsync.deferred import build_qq_raw_track_song_infos

        client = SimpleNamespace(
            source="QQMusicClient",
            _constructuniqueworkdir=lambda keyword: f"/tmp/{keyword}",
            _removeduplicates=lambda song_infos: list(song_infos),
        )
        song_infos = build_qq_raw_track_song_infos(
            client,
            raw_tracks=[
                {
                    "songmid": "mid-a",
                    "songname": "Song A",
                    "interval": 210,
                    "singer": [{"name": "Singer A"}],
                    "albumname": "Album A",
                    "albummid": "album-a",
                    "sizeflac": 1024,
                },
                {
                    "songmid": "mid-b",
                    "songname": "Song B",
                    "interval": 180,
                    "singer": [{"name": "Singer B"}],
                    "albumname": "Album B",
                    "albummid": "album-b",
                    "size320": 512,
                },
            ],
            playlist_name="QQ Playlist",
        )

        self.assertEqual(2, len(song_infos))
        self.assertEqual(["mid-a", "mid-b"], [song_info.identifier for song_info in song_infos])
        self.assertEqual(["Song A", "Song B"], [song_info.song_name for song_info in song_infos])
        self.assertEqual(["flac", "mp3"], [song_info.ext for song_info in song_infos])
        self.assertTrue(all(song_info.raw_data["deferred_search"] for song_info in song_infos))