import fs from 'node:fs';
import assert from 'node:assert/strict';

const html = fs.readFileSync(new URL('../www/index.html', import.meta.url), 'utf8');
const main = fs.readFileSync(new URL('../www/main.js', import.meta.url), 'utf8');
const audio = fs.readFileSync(new URL('../www/core/audio.js', import.meta.url), 'utf8');
const realtime = fs.readFileSync(new URL('../www/views/realtime.js', import.meta.url), 'utf8');

const styleSelect = html.match(/<select\b[^>]*\bid="styleSel"[^>]*>/)?.[0] || '';
assert(styleSelect, 'style selector is missing');
assert(!/\bopt-w-\d+\b/.test(styleSelect), 'style selector must not have a fixed-width utility class');
assert(/adjustStyleDropdownWidth\(\)/.test(main), 'dynamic style selector sizing is missing');
assert(/styleSel\.style\.width\s*=/.test(main), 'dynamic style selector width assignment is missing');

assert(/currentMetricsSeq\s*=\s*Number\.isFinite\(env\.audio\?\.phoenixMetricsSeq\)/.test(main),
  'render loop must track the metrics sequence used by the RTA');
assert(/renderRequestGeneration\s*\+=\s*1/.test(main),
  'render requests must carry a generation that survives asynchronous rendering');
assert(/renderRequestGeneration\s*===\s*renderGeneration\)\s*renderDirty\s*=\s*false/.test(main),
  'an in-flight render must not clear a newer render request');
assert(/const frameDue\s*=\s*audioOk\s*\|\|\s*elapsed\s*>=\s*target/.test(main),
  'live displays must use requestAnimationFrame directly instead of a second 60 Hz gate');
assert(/await flushPendingPhoenixData\(env, CONFIG\);[^]*?const currentMetricsSeq/.test(main),
  'the render loop must publish buffered Phoenix data before reading frame sequences');
assert(/await updateActiveMeters\(env, d, CONFIG\);\s*[^]*?env\.requestRender\?\.\('audio'\)/.test(audio),
  'audio rendering must be requested after active meters finish updating');
assert(/export async function flushPendingPhoenixData\(env, CONFIG\)/.test(audio),
  'Phoenix data paths must expose one display-synchronized presentation pump');
assert(!/requestAnimationFrame/.test(audio),
  'audio transport must not create requestAnimationFrame loops that compete with the canvas loop');
assert(!/while\s*\(pendingPhoenixFrame\)/.test(audio),
  'metrics transport must coalesce bursts instead of draining every queued state');
assert(!/syncNativePeakHold/.test(realtime),
  'native RTA peak anchors must not be copied directly into the visible hold line');
assert((realtime.match(/applyPeakHold\(state, integrated, CONFIG, range\)/g) || []).length >= 3,
  'every RTA engine must advance peak hold on the display clock');
assert(/useIirEngine[^]*?applyRealtimeBarBallistics\(state, displayBase, CONFIG, range\)/.test(realtime),
  'native IIR bars must advance their visible release on the display clock');

console.log('GUI contract regression tests passed');