const test = require('node:test');
const assert = require('node:assert/strict');
const Database = require('better-sqlite3');
const liveProjection = require('../server/services/liveProjectionService');
const {
    ensureColumns,
    LIVE_PROJECTION_COLUMNS,
    LIVE_PROJECTION_SCHEMA_SQL
} = require('../server/db/liveProjectionSchema');

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
        );
    `);
    ensureColumns(db, 'playlist_items', LIVE_PROJECTION_COLUMNS);
    db.exec(LIVE_PROJECTION_SCHEMA_SQL);
    return db;
}

function seedProjectedChannel(db, index) {
    const logicalId = `logical:${index}`;
    db.prepare(`
        INSERT INTO logical_channels
            (id, fingerprint, display_name, preferred_variant_id, variant_count, created_at, updated_at)
        VALUES (?, ?, ?, ?, 1, 1, 1)
    `).run(logicalId, `channel ${index}`, `Channel ${index}`, `1:${index}`);
    db.prepare(`
        INSERT INTO playlist_items
            (id, source_id, item_id, type, name, category_id, stream_icon, stream_url, data,
             logical_channel_id, grouping_fingerprint, grouping_input_hash, quality_label, quality_rank,
             variant_rank, language_code, language_confidence, language_detector, language_input_hash)
        VALUES (?, 1, ?, 'live', ?, 'general', '', ?, '{}', ?, ?, ?, 'HD', 2, 0, 'en', 1, 'laya', ?)
    `).run(
        `1:${index}`,
        String(index),
        `Channel ${index}`,
        `https://streams.test/${index}.m3u8`,
        logicalId,
        `channel ${index}`,
        `group-hash-${index}`,
        `language-hash-${index}`
    );
}

test('/api/live/channels projection response is bounded for an oversized catalog', () => {
    const db = createProjectionDb();
    for (let index = 0; index < 1500; index++) seedProjectedChannel(db, index);

    try {
        const result = liveProjection.getChannelPage({ includeHidden: false, userId: 7 }, db, {
            iptvOrgCatalog: { findMatch: () => null },
            epgMatching: { findBestMatch: () => null }
        });
        assert.ok(result.channels.length <= 250, `unbounded live channel response returned ${result.channels.length} entries`);
    } finally {
        db.close();
    }
});

test('projected live list returns only a bounded variant preview', () => {
    const db = createProjectionDb();
    const logicalId = 'logical:heavy';
    db.prepare(`
        INSERT INTO logical_channels
            (id, fingerprint, display_name, preferred_variant_id, variant_count, created_at, updated_at)
        VALUES (?, 'heavy channel', 'Heavy Channel', '1:0', 2500, 1, 1)
    `).run(logicalId);
    const insert = db.prepare(`
        INSERT INTO playlist_items
            (id, source_id, item_id, type, name, category_id, stream_icon, stream_url, data,
             logical_channel_id, grouping_fingerprint, grouping_input_hash, quality_label, quality_rank,
             variant_rank, language_code, language_confidence, language_detector, language_input_hash)
        VALUES (?, 1, ?, 'live', ?, 'general', '', ?, '{}', ?, 'heavy channel', ?, 'HD', 2, ?, 'en', 1, 'laya', ?)
    `);
    const insertAll = db.transaction(() => {
        for (let index = 0; index < 2500; index++) {
            insert.run(`1:${index}`, String(index), `Heavy Channel variant ${index}`,
                `https://streams.test/${index}.m3u8`, logicalId, `group-${index}`, index, `language-${index}`);
        }
    });
    insertAll();
    try {
        const result = liveProjection.getChannelPage({ includeHidden: false, userId: 7 }, db);
        assert.equal(result.channels.length, 1);
        assert.equal(result.channels[0].variantCount, 2500);
        assert.ok(result.channels[0].variants.length <= 3);
    } finally {
        db.close();
    }
});