const test = require('node:test');
const assert = require('node:assert/strict');
const grouping = require('../public/js/services/channelVariantGrouping.js');

const channel = (id, name, extra = {}) => ({ id, streamId: id, sourceId: 1, name, groupTitle: 'Sports', ...extra });

test('normalizes regional prefixes and quality markers into one logical channel', () => {
    const names = ['|FR| BEIN SPORTS uhd 1', '|FR| BEIN SPORTS 1 4K', 'FR-CAR| bein sports 1'];
    assert.deepEqual(names.map(grouping.normalizeChannelName), ['bein sports 1', 'bein sports 1', 'bein sports 1']);
    const logical = grouping.groupChannels(names.map((name, index) => channel(String(index + 1), name)));
    assert.equal(logical.length, 1);
    assert.equal(logical[0].displayName, 'beIN Sports 1');
    assert.equal(logical[0].variants.length, 3);
});

test('does not merge distinct numbered channels', () => {
    const logical = grouping.groupChannels([
        channel('1', 'beIN Sports 1 HD'),
        channel('2', 'beIN Sports 2 HD')
    ]);
    assert.deepEqual(logical.map(item => item.fingerprint), ['bein sports 1', 'bein sports 2']);
});

test('normalizes captured beIN Sports aliases like the server projection', () => {
    const aliases = [
        'C Car beIN Sports 1',
        'C Reu beIN Sports 1',
        'Thai beIN Sports 1 Thai',
        'beIN Sports 1',
        'beIN Sports 1 12h',
        'beIN Sports 1 2h',
        'beIN Sports 1 4h',
        'beIN Sports 1 8h',
        'beIN Sports 1 Appel',
        'beIN Sports 1 En',
        'beIN Sports 1 Fr',
        'beIN Sports 1 Tod'
    ];
    assert.deepEqual(aliases.map(grouping.normalizeChannelName), Array(aliases.length).fill('bein sports 1'));
    const logical = grouping.groupChannels(aliases.map((name, index) => channel(String(index), name)));
    assert.equal(logical.length, 1);
    assert.equal(logical[0].variants.length, aliases.length);
});

test('keeps distinct beIN numbers and unknown suffixes separate', () => {
    assert.equal(grouping.normalizeChannelName('beIN Sports 1'), 'bein sports 1');
    assert.equal(grouping.normalizeChannelName('beIN Sports 2'), 'bein sports 2');
    assert.equal(grouping.normalizeChannelName('beIN Sports Max 10'), 'bein sports max 10');
    assert.equal(grouping.normalizeChannelName('Partner beIN Sports 1 Event'), 'bein sports 1 event');
    assert.notEqual(
        grouping.normalizeChannelName('Partner beIN Sports 1 Event'),
        grouping.normalizeChannelName('beIN Sports 1')
    );
});

test('preserves precomputed projection boundaries and display names', () => {
    const logical = grouping.groupChannels([
        channel('1', 'Shared Name HD', { logicalId: 'logical:a', logicalFingerprint: 'a', logicalDisplayName: 'Backend A' }),
        channel('2', 'Shared Name 4K', { logicalId: 'logical:b', logicalFingerprint: 'b', logicalDisplayName: 'Backend B' })
    ]);
    assert.deepEqual(logical.map(item => [item.id, item.displayName]), [
        ['logical:a', 'Backend A'],
        ['logical:b', 'Backend B']
    ]);
});

test('logical favorite and hidden state are derived from individual streams', () => {
    const variants = [channel('1', 'BEIN SPORTS 1 HD'), channel('2', 'BEIN SPORTS 1 4K')];
    const logical = grouping.groupChannels(variants, {
        isFavorite: item => item.id === '1',
        isHidden: item => item.id === '2'
    })[0];
    assert.equal(logical.isFavorite, true);
    assert.equal(logical.isHidden, false);
    assert.equal(logical.preferredVariant.id, '1');

    assert.equal(grouping.groupChannels(variants, { isHidden: () => true }).length, 0);
    assert.equal(grouping.groupChannels(variants, { isHidden: () => true, showHidden: true })[0].isHidden, true);
});

test('an explicit visible selection overrides the automatic quality preference', () => {
    const hd = channel('1', 'BEIN SPORTS 1 HD');
    const uhd = channel('2', 'BEIN SPORTS 1 UHD');
    const selectedVariants = new Map([['bein sports 1', grouping.getVariantKey(hd)]]);
    const logical = grouping.groupChannels([hd, uhd], { selectedVariants })[0];
    assert.equal(logical.preferredVariant.id, '1');
});

test('flat list ordering promotes favorites without duplicating channels', () => {
    const channels = [
        { id: 'one', isFavorite: false },
        { id: 'two', isFavorite: true },
        { id: 'three', isFavorite: false },
        { id: 'four', isFavorite: true }
    ];
    const ordered = grouping.orderFlatChannels(channels);
    assert.deepEqual(ordered.map(item => item.id), ['two', 'four', 'one', 'three']);
    assert.equal(new Set(ordered.map(item => item.id)).size, channels.length);
});

test('favorites group updates are disabled for flat lists', () => {
    assert.equal(grouping.shouldUseFavoritesGroup('flat'), false);
    assert.equal(grouping.shouldUseFavoritesGroup('grouped'), true);
});

test('Laya language results participate in variant selection', () => {
    const lowQualityFrench = channel('1', 'Sports One SD');
    const highQualityEnglish = channel('2', 'Sports One 4K');
    const languageResults = new Map([
        [grouping.getVariantKey(lowQualityFrench), { language: 'fr', confidence: 0.92 }],
        [grouping.getVariantKey(highQualityEnglish), { language: 'en', confidence: 0.94 }]
    ]);
    const logical = grouping.groupChannels([lowQualityFrench, highQualityEnglish], {
        languageMode: 'laya',
        languageResults,
        preferredLanguage: 'fr'
    })[0];
    assert.equal(logical.preferredVariant.id, '1');
    assert.deepEqual(logical.availableLanguages.map(item => item.code), ['fr', 'en']);
});

test('language selection immediately resolves the best visible matching variant', () => {
    const frenchSd = channel('fr-sd', 'Sports One SD');
    const frenchHd = channel('fr-hd', 'Sports One HD');
    const english4k = channel('en-4k', 'Sports One 4K');
    const languageResults = new Map([
        [grouping.getVariantKey(frenchSd), { language: 'fr', confidence: 0.9 }],
        [grouping.getVariantKey(frenchHd), { language: 'fr', confidence: 0.9 }],
        [grouping.getVariantKey(english4k), { language: 'en', confidence: 0.95 }]
    ]);
    const logical = grouping.groupChannels([frenchSd, frenchHd, english4k], {
        languageMode: 'laya',
        languageResults
    })[0];
    const selected = grouping.selectVariantByLanguage(logical, 'fr', {
        isHidden: variant => variant.id === 'fr-hd'
    });
    assert.equal(selected.id, 'fr-sd');
});