const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');
const test = require('node:test');
const assert = require('node:assert/strict');

function loadScript(scriptPath, sandbox) {
  const source = fs.readFileSync(scriptPath, 'utf8');
  vm.runInNewContext(source, sandbox, { filename: scriptPath });
}

test('webpage preloading only targets the next slide', () => {
  const sandbox = {
    window: null,
    Date,
    Array,
    Number,
    String,
    Boolean,
    Object,
    Math,
    console,
    escapeHtml(value) {
      return String(value || '');
    },
    currentPlaylistSignature: 'signature',
    slides: [],
    index: 0,
    activeSlidesCacheKey: '',
    activeSlidesCacheValue: [],
    renderCacheViewportKey: '',
    preloadSignature: '',
    preloadContainer: null
  };
  sandbox.window = sandbox;

  loadScript(path.join(__dirname, '..', 'src', 'player', 'public', 'js', 'player-page-playlist.js'), sandbox);

  const current = { id: 1 };
  const next = { id: 2 };
  const later = { id: 3 };

  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 0).map((slide) => slide.id).join(','), '2');
  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 1).map((slide) => slide.id).join(','), '3');
  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 2).map((slide) => slide.id).join(','), '');
});

test('rtmp warmups only target the next slide', () => {
  const sandbox = {
    window: null,
    Date,
    Array,
    Number,
    String,
    Boolean,
    Object,
    Math,
    console,
    fetch() {
      throw new Error('not expected');
    },
    currentPlaylistSkipUnavailableRtmp: false,
    videoRegionRenderVersion: 0,
    slideMarkupCache: Object.create(null),
    slides: [],
    index: 0,
    setTimeout,
    clearTimeout,
    document: {
      createElement() {
        return {
          className: '',
          setAttribute() {},
          appendChild() {},
          parentNode: null,
          addEventListener() {}
        };
      },
      body: {
        appendChild() {}
      }
    },
    pulsePlayerRegionTypes: {
      register() {}
    }
  };
  sandbox.window = sandbox;

  loadScript(path.join(__dirname, '..', 'src', 'player', 'regions', 'rtmp.js'), sandbox);

  const current = { id: 1 };
  const next = { id: 2 };
  const later = { id: 3 };

  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 0).map((slide) => slide.id).join(','), '2');
  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 1).map((slide) => slide.id).join(','), '3');
  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 2).map((slide) => slide.id).join(','), '');
});