import os
import shutil

import mutagen
import pytest

from symuid._tag_interface import ID3


@pytest.fixture
def empty_id3_iface(tmpdir, tracks_dir_path):
    path = tmpdir.join('empty.mp3').strpath
    shutil.copyfile(
        src=os.path.join(tracks_dir_path, 'id3v2.4-empty.mp3'),
        dst=path,
    )
    return ID3(mutagen.File(path))


@pytest.mark.parametrize('track_name', ['id3v2.4-empty.mp3'])
def test_get_track_path(tracks_dir_path, track_name):
    track_path = os.path.join(tracks_dir_path, track_name)
    iface = ID3(mutagen.File(track_path))
    assert track_path == iface.track_path


@pytest.mark.parametrize(('track_name', 'tag_label', 'expected_text'), [
    ('id3v2.4-empty.mp3', 'TPE1', None),
    ('id3v2.4-typical.mp3', 'TPE1', 'some artist'),
    ('id3v2.4-typical.mp3', 'COMM::eng', 'some comment'),
    ('id3v2.4-typical.mp3', 'COMM', None),
])
def test__get_single_text(tracks_dir_path, track_name, tag_label, expected_text):
    iface = ID3(mutagen.File(os.path.join(tracks_dir_path, track_name)))
    assert expected_text == iface._get_single_text(tag_label)


@pytest.mark.parametrize(('track_name', 'expected_comment'), [
    ('id3v2.4-empty.mp3', None),
    ('id3v2.4-typical.mp3', 'some comment'),
])
def test_get_comment(tracks_dir_path, track_name, expected_comment):
    iface = ID3(mutagen.File(os.path.join(tracks_dir_path, track_name)))
    assert expected_comment == iface.get_comment()


def test_set_comment(empty_id3_iface):
    assert empty_id3_iface.get_comment() is None
    empty_id3_iface.set_comment('latin')
    assert empty_id3_iface.get_comment() == 'latin'
    empty_id3_iface.set_comment('你好')
    assert empty_id3_iface.get_comment() == '你好'
    empty_id3_iface.save()
    tags = mutagen.File(empty_id3_iface.track_path).tags
    assert len(tags) == 1
    tag = tags.values()[0]
    assert isinstance(tag, mutagen.id3.COMM)
    assert tag.lang == 'eng'
    assert tag.text == ['你好']