const assert = require('node:assert/strict');
const { readFileSync } = require('node:fs');
const { resolve } = require('node:path');
const { test } = require('node:test');
const { runInNewContext } = require('node:vm');

const root = resolve(__dirname, '../../');
const source = readFileSync(resolve(root, 'reproxy/web/minecraft/app.js'), 'utf8');

async function renderStatus(response, error) {
    const elements = Object.fromEntries(['server-status', 'build-status', 'build-download'].map(id => [id, {}]));
    const requests = [];
    let refresh;
    const context = {
        document: { getElementById: id => elements[id] },
        AbortSignal,
        TextDecoder,
        Uint8Array,
        atob,
        fetch: async (url, options) => {
            requests.push({ url, options });
            if (url.endsWith('/readme')) {
                return { ok: true, json: async () => ({ encoding: 'base64', content: Buffer.from('Актуальная версия — **1.2.3**: [Скачать 1.2.3](dist/minecraft-lab-neoforge-spike-1.2.3/minecraft-lab-neoforge-spike-1.2.3.mrpack)').toString('base64') }) };
            }
            if (error) throw error;
            return response;
        },
        setInterval: (callback, delay) => { refresh = { callback, delay }; },
    };
    runInNewContext(source, context);
    await new Promise(setImmediate);
    assert.equal(elements['build-download'].hidden, false);
    assert.match(elements['build-download'].href, /1\.2\.3\.mrpack$/);
    assert.equal(refresh.delay, 300000);
    await refresh.callback();
    assert.equal(requests.filter(request => request.url === '/minecraft/api/status').length, 2);
    assert.ok(requests.every(request => request.options.signal instanceof AbortSignal));
    return elements['server-status'].textContent;
}

for (const [name, data, expected] of [
    ['positive count', { online: true, players: { online: 7 } }, 'Игроков онлайн: 7'],
    ['zero count', { online: true, players: { online: 0 } }, 'Игроков онлайн: 0'],
    ['offline', { online: false }, 'Сервер недоступен'],
    ...[null, {}, { online: true }, { online: true, players: { online: -1 } }, { online: true, players: { online: '2' } }].map(data => ['invalid response ' + JSON.stringify(data), data, 'Не удалось получить онлайн']),
]) {
    test(name, async () => assert.equal(await renderStatus({ ok: true, json: async () => data }), expected));
}

test('HTTP failure', async () => assert.equal(await renderStatus({ ok: false }), 'Не удалось получить онлайн'));
test('invalid JSON', async () => assert.equal(await renderStatus({ ok: true, json: async () => { throw new SyntaxError(); } }), 'Не удалось получить онлайн'));
test('timeout', async () => assert.equal(await renderStatus(null, new DOMException('Timeout', 'TimeoutError')), 'Не удалось получить онлайн'));
test('network failure', async () => assert.equal(await renderStatus(null, new TypeError('Failed to fetch')), 'Не удалось получить онлайн'));

test('Telemost link and initial status', () => {
    const html = readFileSync(resolve(root, 'reproxy/web/minecraft/index.html'), 'utf8');
    assert.match(html, /href="https:\/\/telemost\.yandex\.ru\/j\/76726739040099\?skip_app=1" target="_blank" rel="noopener noreferrer"/);
    assert.match(html, /id="server-status" role="status">Проверяем онлайн…/);
});