const test = require('node:test');
const assert = require('node:assert/strict');
const Database = require('better-sqlite3');
const {
    normalizeChannelName,
    getChannelPage,
    projectCatalog,
    markProjectionBuilding,
    projectionState,
    rebuildWithSignals,
    serializeChannels,
    startRebuild
} = require('../server/services/liveProjectionService');
const {
    LIVE_PROJECTION_COLUMNS,
    LIVE_PROJECTION_SCHEMA_SQL
} = require('../server/db/liveProjectionSchema');

const item = (id, name, extra = {}) => ({
    id: `1:${id}`,
    source_id: 1,
    item_id: String(id),
    name,
    category_id: 'sports',
    ...extra
});

function createProjectionDb() {
    const db = new Database(':memory:');
    db.exec(`
        CREATE TABLE categories (
            id TEXT PRIMARY KEY,
            source_id INTEGER NOT NULL,
            category_id TEXT NOT NULL,
            type TEXT NOT NULL,
            name TEXT NOT NULL,
            parent_id TEXT,
            is_hidden INTEGER DEFAULT 0,
            data JSON
        );
        CREATE TABLE playlist_items (
            id TEXT PRIMARY KEY,
            source_id INTEGER NOT NULL,
            item_id TEXT NOT NULL,
            type TEXT NOT NULL,
            name TEXT NOT NULL,
            category_id TEXT,
            parent_id TEXT,
            stream_icon TEXT,
            stream_url TEXT,
            container_extension TEXT,
            rating REAL,
            year TEXT,
            added_at TEXT,
            is_hidden INTEGER DEFAULT 0,
            is_favorite INTEGER DEFAULT 0,
            data JSON
        );
        CREATE TABLE favorites (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            user_id INTEGER NOT NULL,
            source_id INTEGER NOT NULL,
            item_id TEXT NOT NULL,
            item_type TEXT NOT NULL
        );
    `);
    const { ensureColumns } = require('../server/db/liveProjectionSchema');
    ensureColumns(db, 'playlist_items', LIVE_PROJECTION_COLUMNS);
    db.exec(LIVE_PROJECTION_SCHEMA_SQL);
    return db;
}

function seedProjectionChannel(db, itemId, name) {
    db.prepare(`
        INSERT INTO playlist_items
            (id, source_id, item_id, type, name, category_id, stream_icon, stream_url, data)
        VALUES (?, 1, ?, 'live', ?, 'sports', '', ?, '{}')
    `).run(`1:${itemId}`, itemId, name, `https://streams.test/${itemId}.m3u8`);
}

function waitFor(condition, message) {
    return new Promise((resolve, reject) => {
        const started = Date.now();
        const poll = () => {
            if (condition()) return resolve();
            if (Date.now() - started > 1000) return reject(new Error(message));
            setTimeout(poll, 5);
        };
        poll();
    });
}

test('projection migration declares grouping and language columns', () => {
    assert.deepEqual(Object.keys(LIVE_PROJECTION_COLUMNS), [
        'logical_channel_id', 'grouping_fingerprint', 'grouping_input_hash',
        'quality_label', 'quality_rank', 'variant_rank', 'language_code',
        'language_confidence', 'language_scores', 'language_evidence',
        'language_detector', 'language_input_hash'
    ]);
    assert.match(LIVE_PROJECTION_SCHEMA_SQL, /CREATE TABLE IF NOT EXISTS logical_channels/);
    assert.match(LIVE_PROJECTION_SCHEMA_SQL, /CREATE TABLE IF NOT EXISTS catalog_projection_state/);
    assert.match(LIVE_PROJECTION_SCHEMA_SQL, /idx_items_logical_channel/);
});

test('manual rebuild scheduling coalesces concurrent requests', async () => {
    let scheduled;
    let runs = 0;
    const state = { status: 'building', processed_count: 0, total_count: 2 };
    const options = {
        mark: () => state,
        runner: async () => { runs++; return { status: 'success' }; },
        schedule: callback => { scheduled = callback; }
    };
    const first = startRebuild({}, options);
    const second = startRebuild({}, options);
    assert.equal(first.alreadyRunning, false);
    assert.equal(second.alreadyRunning, true);
    assert.equal(second.promise, first.promise);
    scheduled();
    await first.promise;
    assert.equal(runs, 1);
});

test('Laya rebuild progress advances after a successful identity batch while analysis is still running', async () => {
    const db = createProjectionDb();
    for (let index = 0; index < 12; index++) {
        seedProjectionChannel(db, `bein-${index}`, `beIN Sports 1 regional ${index}`);
    }

    let calls = 0;
    let secondBatchStarted = false;
    let releaseSecondBatch;
    const secondBatchGate = new Promise(resolve => { releaseSecondBatch = resolve; });
    const layaClient = {
        identityHintBatch: async pairs => {
            calls += 1;
            if (calls === 2) {
                secondBatchStarted = true;
                await secondBatchGate;
            }
            return pairs.map(pair => ({
                id: pair.id,
                sameIdentityProbability: 0.9,
                confidence: 0.9,
                family: 'bein sports',
                number: '1'
            }));
        }
    };

    markProjectionBuilding(db);
    const rebuild = rebuildWithSignals(db, {
        mode: 'laya',
        layaClient,
        stateAlreadyBuilding: true
    });

    try {
        await waitFor(() => secondBatchStarted, 'Expected the second Laya identity batch to start');
        const state = projectionState(db);
        assert.equal(state.status, 'building');
        assert.equal(state.phase, 'laya_identity');
        assert.equal(state.total_count, 12);
        assert.equal(state.processed_count, 0);
        assert.equal(state.laya_processed_count, 1);
        assert.equal(state.laya_total_count, 2);
    } finally {
        releaseSecondBatch();
        await rebuild;
    }
});

test('projects beIN quality variants into one logical channel', () => {
    const groups = projectCatalog([
        item('uhd', '|FR| BEIN SPORTS 1 UHD'),
        item('4k', '|FR| BEIN SPORTS 1 4K'),
        item('car', 'FR-CAR| bein sports 1')
    ]);
    assert.equal(groups.length, 1);
    assert.equal(groups[0].fingerprint, 'bein sports 1');
    assert.equal(groups[0].displayName, 'beIN Sports 1');
    assert.equal(groups[0].variants.length, 3);
    assert.deepEqual(groups[0].variants.map(variant => variant.variantRank), [0, 1, 2]);
});

test('normalizes the captured beIN Sports 1 aliases to one exact fingerprint', () => {
    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(normalizeChannelName), Array(aliases.length).fill('bein sports 1'));
    const groups = projectCatalog(aliases.map((name, index) => item(index, name)));
    assert.equal(groups.length, 1);
    assert.equal(groups[0].fingerprint, 'bein sports 1');
    assert.equal(groups[0].variants.length, aliases.length);
});

test('does not merge distinct numbered beIN channels', () => {
    const groups = projectCatalog([
        item('1', 'beIN Sports 1 HD'),
        item('2', 'beIN Sports 2 HD')
    ]);
    assert.deepEqual(groups.map(group => group.fingerprint), ['bein sports 1', 'bein sports 2']);
    assert.equal(normalizeChannelName('beIN Sports Max 10'), 'bein sports max 10');
});

test('keeps unknown beIN suffixes distinct instead of applying fuzzy matching', () => {
    assert.equal(normalizeChannelName('Partner beIN Sports 1 Event'), 'bein sports 1 event');
    assert.notEqual(normalizeChannelName('Partner beIN Sports 1 Event'), normalizeChannelName('beIN Sports 1'));
});

test('renaming a stream changes its projection membership and input hash', () => {
    const before = projectCatalog([item('1', 'beIN Sports 1 HD'), item('2', 'beIN Sports 1 4K')]);
    const after = projectCatalog([item('1', 'beIN Sports 2 HD'), item('2', 'beIN Sports 1 4K')]);
    assert.equal(before.length, 1);
    assert.equal(after.length, 2);
    const beforeRename = before.flatMap(group => group.variants).find(variant => variant.id === '1:1');
    const afterRename = after.flatMap(group => group.variants).find(variant => variant.id === '1:1');
    assert.notEqual(beforeRename.groupingInputHash, afterRename.groupingInputHash);
});

test('API serialization filters source rows upstream and hidden variants by option', () => {
    const rows = [
        {
            ...item('1', 'beIN Sports 1 HD'), logical_channel_id: 'logical:1',
            grouping_fingerprint: 'bein sports 1', display_name: 'beIN Sports 1',
            preferred_variant_id: '1:1', quality_label: 'HD', quality_rank: 2,
            variant_rank: 0, is_hidden: 0, category_hidden: 0, category_name: 'Sports Premium',
            user_favorite: 1, data: '{}'
        },
        {
            ...item('2', 'beIN Sports 1 4K'), logical_channel_id: 'logical:1',
            grouping_fingerprint: 'bein sports 1', display_name: 'beIN Sports 1',
            preferred_variant_id: '1:1', quality_label: '4K', quality_rank: 4,
            variant_rank: 1, is_hidden: 1, category_hidden: 0, category_name: 'Sports Premium',
            user_favorite: 0, data: '{}'
        }
    ];
    const visible = serializeChannels(rows, false);
    assert.equal(visible[0].variants.length, 1);
    assert.equal(visible[0].isFavorite, true);
    assert.equal(visible[0].groupTitle, 'Sports Premium');
    assert.equal(visible[0].categoryName, 'Sports Premium');
    assert.equal(visible[0].variants[0].groupTitle, 'Sports Premium');
    assert.equal(serializeChannels(rows, true)[0].variants.length, 2);
});

test('API serialization preserves an M3U groupTitle over the stored category fallback', () => {
    const rows = [{
        ...item('m3u', 'M3U Sports HD'), logical_channel_id: 'logical:m3u',
        grouping_fingerprint: 'm3u sports', display_name: 'M3U Sports',
        preferred_variant_id: '1:m3u', quality_label: 'HD', quality_rank: 2,
        variant_rank: 0, is_hidden: 0, category_hidden: 0,
        category_name: 'Fallback category', user_favorite: 0,
        data: JSON.stringify({ groupTitle: 'M3U Sports France' })
    }];
    const [channel] = serializeChannels(rows, false);
    assert.equal(channel.groupTitle, 'M3U Sports France');
    assert.equal(channel.variants[0].categoryName, 'M3U Sports France');
});

test('search and language filters run before expensive standard and EPG enrichment', () => {
    const db = createProjectionDb();
    seedProjectionChannel(db, 'bein-fr', '|FR| beIN Sports 1 HD');
    seedProjectionChannel(db, 'bein-en', '|UK| beIN Sports 1 4K');
    seedProjectionChannel(db, 'euro-fr', '|FR| Eurosport HD');
    require('../server/services/liveProjectionService').rebuild(db);

    let standardCalls = 0;
    let epgCalls = 0;
    const page = getChannelPage({ q: 'Bein Sport 1', languages: ['fr'], epgSources: [] }, db, {
        iptvOrgCatalog: { findMatch: () => { standardCalls += 1; return null; } },
        epgMatching: { findBestMatch: () => { epgCalls += 1; return null; } }
    });

    assert.equal(page.channels.length, 1);
    assert.equal(page.channels[0].language.code, 'fr');
    assert.deepEqual(page.availableLanguages.map(language => language.code).sort(), ['en', 'fr']);
    assert.equal(standardCalls, 1);
    assert.equal(epgCalls, 1);
});

test('full catalog listing skips synchronous per-channel enrichment', () => {
    const db = createProjectionDb();
    for (let index = 0; index < 500; index++) {
        seedProjectionChannel(db, `channel-${index}`, `Channel ${index} HD`);
    }
    require('../server/services/liveProjectionService').rebuild(db);

    let standardCalls = 0;
    let epgCalls = 0;
    const started = Date.now();
    const page = getChannelPage({ languages: [], q: '', epgSources: [{ id: 99, type: 'epg', enabled: true }] }, db, {
        iptvOrgCatalog: { findMatch: () => { standardCalls += 1; return null; } },
        epgMatching: { findBestMatch: () => { epgCalls += 1; return null; } }
    });

    assert.equal(page.channels.length, 500);
    assert.equal(standardCalls, 0);
    assert.equal(epgCalls, 0);
    assert.ok(Date.now() - started < 1000);
});

test('broad searches above the enrichment guard remain bounded', () => {
    const db = createProjectionDb();
    for (let index = 0; index < 300; index++) seedProjectionChannel(db, `news-${index}`, `News ${index}`);
    require('../server/services/liveProjectionService').rebuild(db);
    let calls = 0;
    const page = getChannelPage({ q: 'news', epgSources: [] }, db, {
        iptvOrgCatalog: { findMatch: () => { calls += 1; return null; } },
        epgMatching: { findBestMatch: () => { calls += 1; return null; } }
    });
    assert.equal(page.channels.length, 300);
    assert.equal(calls, 0);
});