from unittest import TestCase

import os
import subprocess

from mutagen import mp3

import config
import http_pool
import id3pp


TEST_MP3 = 'music/test.mp3'

INFO_BEFORE = {
    "filepath": TEST_MP3,
    "title": "A Line in the Sand",
    "uploader": "Linkin Park - Topic",
    "playlist": "Album \u2013 The Hunting Party",
    "playlist_index": 12,
    "release_year": 2015,
    "genre": "numetal",
}

INFO_AFTER = {
    **INFO_BEFORE,
    "track": "A Line in the Sand",
    "artist": "Linkin Park",
    "artists": ["Linkin Park"],
    "album": "The Hunting Party",
    "track_number": 12,
}


class TestPostProcessorsOnFakeData(TestCase):

    def setUp(self) -> None:

        cfg = config.get()
        cfg.save_lyrics = False
        cfg.save_cover = False

        http_pool.get()

    def test_infoytpp(self) -> None:

        _, info = id3pp.InfoGenPP().run(INFO_BEFORE)
        self.assertDictEqual(info, INFO_AFTER)

    def test_id3(self) -> None:

        try:
            if os.path.exists(TEST_MP3):
                os.unlink(TEST_MP3)
            ret = subprocess.call(
                [
                    'ffmpeg',
                    '-nostdin',
                    '-f', 'lavfi',
                    '-i', 'anullsrc=r=44100:cl=mono',
                    '-t', '1',
                    '-b:a', '32k',
                    '-acodec', 'libmp3lame',
                    TEST_MP3,
                ],
                stdout=subprocess.DEVNULL,
                stderr=subprocess.DEVNULL,
            )
            if ret != 0:
                raise RuntimeError(f'FFmpeg returned {ret} exit code')
        except Exception as err:
            self.skipTest(f'Error while writing empty MP3: {err!r}')

        id3pp.ID3TagsPP().run(INFO_AFTER)

        file = mp3.MP3(TEST_MP3)
        self.assertEqual(file['TIT2'].text[0], 'A Line in the Sand')
        self.assertEqual(file['TPE1'].text[0], 'Linkin Park')
        self.assertEqual(file['TALB'].text[0], 'The Hunting Party')
        self.assertEqual(file['TDRC'].text[0].get_text(), '2015')
        self.assertEqual(file['TRCK'].text[0], '12')
        self.assertEqual(file['TCON'].text[0], 'numetal')

    def tearDown(self) -> None:

        http_pool.get().clear()