#!/usr/bin/env node

import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
const template = fs.readFileSync(path.join(repoRoot, 'website', 'template.html'), 'utf8');
const app = fs.readFileSync(path.join(repoRoot, 'website', 'app.js'), 'utf8');
const langInit = fs.readFileSync(path.join(repoRoot, 'website', 'lang-init.js'), 'utf8');
const demoCss = fs.readFileSync(path.join(repoRoot, 'website', 'styles', 'demo.css'), 'utf8');
const landingPrimaryCss = fs.readFileSync(path.join(repoRoot, 'website', 'styles', 'landing-primary.css'), 'utf8');
const mockupStart = template.indexOf('<div class="extension-mockup">');
const mockupEnd = template.indexOf('<div class="demo-invite-fly"', mockupStart);

if (mockupStart === -1 || mockupEnd === -1) {
  throw new Error('Could not locate the extension mockup in website/template.html');
}

const mockup = template.slice(mockupStart, mockupEnd);
const themeSensitiveControls = [
  ['video selector', /<select[^>]+id="demo-video-select"[^>]+>/],
  ['sync target', /<div[^>]+class="mock-input"[^>]+title="Choose sync target"[^>]*>/],
  ['WebSocket status', /<span style="[^"]*flex:1;[^"]*">\s*\{\{MOCK_27\}\}/]
];

for (const [label, pattern] of themeSensitiveControls) {
  const match = mockup.match(pattern);
  if (!match) throw new Error(`Could not locate ${label} in the extension mockup`);
  if (!/color:\s*var\(--text\)/.test(match[0])) {
    throw new Error(`${label} must use var(--text) so it remains readable in both themes`);
  }
}

const landingStylesheets = [...template.matchAll(/<link\b[^>]*\brel="stylesheet"[^>]*\bhref="\{\{ASSET_PATH\}\}landing[^">]*"[^>]*>/g)];
if (landingStylesheets.length !== 1) {
  throw new Error(`Landing must load exactly one render-blocking stylesheet; found ${landingStylesheets.length}`);
}

const landingStylesheet = landingStylesheets[0][0];
if (!/href="\{\{ASSET_PATH\}\}landing\.min\.css"/.test(landingStylesheet)) {
  throw new Error('Landing stylesheet must use the landing.min.css build placeholder');
}
if (/\bmedia=|data-(?:landing-)?deferred/.test(landingStylesheet)) {
  throw new Error('Landing stylesheet must not be activated after first paint');
}

const runtimeCssActivation = [
  ['app.js', app],
  ['lang-init.js', langInit]
];
for (const [file, source] of runtimeCssActivation) {
  if (/createElement\(['"]link['"]\)|requestIdleCallback|data-landing-deferred|data-deferred-css|\.media\s*=\s*['"]all['"]/.test(source)) {
    throw new Error(`${file} must not dynamically load or activate structural CSS`);
  }
}

const heroBirds = template.match(/class="film-hero-bird"/g) || [];
const leftWings = template.match(/class="film-bird-wing film-bird-wing-left"/g) || [];
const rightWings = template.match(/class="film-bird-wing film-bird-wing-right"/g) || [];
if (heroBirds.length !== 4 || leftWings.length !== heroBirds.length || rightWings.length !== heroBirds.length) {
  throw new Error('Every foreground film bird must have independently animated left and right wings');
}
if (!/\.film-hero-bird-drift\s*\{[^}]*animation:\s*filmBirdGlide/s.test(demoCss) ||
    !/\.film-bird-wing\s*\{[^}]*animation:\s*filmWingFlap/s.test(demoCss)) {
  throw new Error('Foreground film birds must glide and flap without waiting for video playback');
}

const gettingStartedLightSurfaces = [
  'step-illustration-1',
  'step-illustration-2',
  'step-illustration-3',
  'illus-popup-card',
  'illus-player-card',
  'popup-select-mock'
];
for (const className of gettingStartedLightSurfaces) {
  const pattern = new RegExp(`html\\.theme-light[^{]*\\.${className}[^}]*\\{`);
  if (!pattern.test(landingPrimaryCss)) {
    throw new Error(`Getting Started .${className} must define an explicit light-theme surface`);
  }
}

console.log('Extension mockup theme-sensitive text uses theme-aware colors');
console.log('Landing CSS is render-blocking, single-request, and cascade-stable');
console.log('Foreground film birds use complete, always-on wing and glide animations');
console.log('All Getting Started mockups define explicit light-theme surfaces');