import os
import re

import mutagen
import pytest

from symuid._tag_interface import ID3

# pylint: disable=protected-access


@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-typical.mp3', 'TPE1', 'some artist'),
    ('id3v2.4-typical.mp3', 'COMM::eng', 'some comment'),
])
def test__get_str(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_str(tag_label)


@pytest.mark.parametrize(('track_name', 'tag_label'), [
    ('id3v2.4-empty.mp3', 'TPE1'),
    ('id3v2.4-typical.mp3', 'COMM'),
])
def test__get_str_missing(tracks_dir_path, track_name, tag_label):
    iface = ID3(mutagen.File(os.path.join(tracks_dir_path, track_name)))
    with pytest.raises(KeyError, match=re.escape(tag_label)):
        iface._get_str(tag_label)


def test__get_free_str(empty_id3_path):
    mutagen_file = mutagen.File(empty_id3_path)
    mutagen_file.tags.add(mutagen.id3.TXXX(
        desc='foo',
        text='bar',
    ))
    mutagen_file.save()
    id3_iface = ID3(mutagen.File(empty_id3_path))
    assert id3_iface._get_free_str('foo') == 'bar'


def test__get_free_str_missing(empty_id3_path):
    iface = ID3(mutagen.File(empty_id3_path))
    with pytest.raises(KeyError, match=r'TXXX:foo'):
        iface._get_free_str('foo')


@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_path):
    empty_id3_iface = ID3(mutagen.File(empty_id3_path))
    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']


@pytest.mark.parametrize(('tag_label', 'tag_value', 'expected_value'), [
    ('foo', '21/42', (21, 42)),
    ('bar', '-1/4', (-1, 4)),
    ('ham:egg', '0/-3', (0, -3)),
])
def test_get_free_int_ratio(empty_id3_path, tag_label, tag_value, expected_value):
    mutagen_file = mutagen.File(empty_id3_path)
    mutagen_file.tags.add(mutagen.id3.TXXX(
        encoding=mutagen.id3.Encoding.LATIN1,
        desc=tag_label,
        text=[tag_value],
    ))
    mutagen_file.save()
    id3_iface = ID3(mutagen.File(empty_id3_path))
    assert id3_iface.get_free_int_ratio(tag_label) == expected_value


@pytest.mark.parametrize(
    ('tag_label', 'nominator', 'denominator', 'expected_tag_value'),
    [('foo', 21, 42, '21/42'),
     ('bar', -1, 4, '-1/4'),
     ('ham:egg', 0, -3, '0/-3')],
)
def test_set_free_int_ratio(empty_id3_path, tag_label, nominator, denominator, expected_tag_value):
    id3_iface = ID3(mutagen.File(empty_id3_path))
    assert repr(id3_iface.set_free_int_ratio(tag_label, nominator, denominator))
    id3_iface.save()
    mutagen_file = mutagen.File(empty_id3_path)
    assert len(mutagen_file.tags) == 1
    assert mutagen_file.tags['TXXX:' + tag_label].text == [expected_tag_value]