# This file is part of beets.
# Copyright 2016, Fabrice Laporte.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Tests for the 'lastgenre' plugin."""


import unittest
from unittest.mock import Mock

from test import _common
from beetsplug import lastgenre
from beets import config

from test.helper import TestHelper


class LastGenrePluginTest(unittest.TestCase, TestHelper):
    def setUp(self):
        self.setup_beets()
        self.plugin = lastgenre.LastGenrePlugin()

    def tearDown(self):
        self.teardown_beets()

    def _setup_config(self, whitelist=False, canonical=False, count=1,
                      prefer_specific=False):
        config['lastgenre']['canonical'] = canonical
        config['lastgenre']['count'] = count
        config['lastgenre']['prefer_specific'] = prefer_specific
        if isinstance(whitelist, (bool, (str,))):
            # Filename, default, or disabled.
            config['lastgenre']['whitelist'] = whitelist
        self.plugin.setup()
        if not isinstance(whitelist, (bool, (str,))):
            # Explicit list of genres.
            self.plugin.whitelist = whitelist

    def test_default(self):
        """Fetch genres with whitelist and c14n deactivated
        """
        self._setup_config()
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         'Delta Blues')

    def test_c14n_only(self):
        """Default c14n tree funnels up to most common genre except for *wrong*
        genres that stay unchanged.
        """
        self._setup_config(canonical=True, count=99)
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         'Blues')
        self.assertEqual(self.plugin._resolve_genres(['iota blues']),
                         'Iota Blues')

    def test_whitelist_only(self):
        """Default whitelist rejects *wrong* (non existing) genres.
        """
        self._setup_config(whitelist=True)
        self.assertEqual(self.plugin._resolve_genres(['iota blues']),
                         '')

    def test_whitelist_c14n(self):
        """Default whitelist and c14n both activated result in all parents
        genres being selected (from specific to common).
        """
        self._setup_config(canonical=True, whitelist=True, count=99)
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         'Delta Blues, Blues')

    def test_whitelist_custom(self):
        """Keep only genres that are in the whitelist.
        """
        self._setup_config(whitelist={'blues', 'rock', 'jazz'},
                           count=2)
        self.assertEqual(self.plugin._resolve_genres(['pop', 'blues']),
                         'Blues')

        self._setup_config(canonical='', whitelist={'rock'})
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         '')

    def test_count(self):
        """Keep the n first genres, as we expect them to be sorted from more to
        less popular.
        """
        self._setup_config(whitelist={'blues', 'rock', 'jazz'},
                           count=2)
        self.assertEqual(self.plugin._resolve_genres(
                         ['jazz', 'pop', 'rock', 'blues']),
                         'Jazz, Rock')

    def test_count_c14n(self):
        """Keep the n first genres, after having applied c14n when necessary
        """
        self._setup_config(whitelist={'blues', 'rock', 'jazz'},
                           canonical=True,
                           count=2)
        # thanks to c14n, 'blues' superseeds 'country blues' and takes the
        # second slot
        self.assertEqual(self.plugin._resolve_genres(
                         ['jazz', 'pop', 'country blues', 'rock']),
                         'Jazz, Blues')

    def test_c14n_whitelist(self):
        """Genres first pass through c14n and are then filtered
        """
        self._setup_config(canonical=True, whitelist={'rock'})
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         '')

    def test_empty_string_enables_canonical(self):
        """For backwards compatibility, setting the `canonical` option
        to the empty string enables it using the default tree.
        """
        self._setup_config(canonical='', count=99)
        self.assertEqual(self.plugin._resolve_genres(['delta blues']),
                         'Blues')

    def test_empty_string_enables_whitelist(self):
        """Again for backwards compatibility, setting the `whitelist`
        option to the empty string enables the default set of genres.
        """
        self._setup_config(whitelist='')
        self.assertEqual(self.plugin._resolve_genres(['iota blues']),
                         '')

    def test_prefer_specific_loads_tree(self):
        """When prefer_specific is enabled but canonical is not the
        tree still has to be loaded.
        """
        self._setup_config(prefer_specific=True, canonical=False)
        self.assertNotEqual(self.plugin.c14n_branches, [])

    def test_prefer_specific_without_canonical(self):
        """Prefer_specific works without canonical.
        """
        self._setup_config(prefer_specific=True, canonical=False, count=4)
        self.assertEqual(self.plugin._resolve_genres(
                         ['math rock', 'post-rock']),