// Loads the real index.html in jsdom, against the browser mock of the Luna
// bus, and drives it the way a remote would. Catches the mistakes that only
// show up when the page actually runs: a typo'd element id, a control wired to
// a setting that does not exist, a render that throws on the first status
// frame.
//
// jsdom is not vendored. Install it anywhere and point NODE_PATH at it:
//   mkdir -p /tmp/audiocap-domtest && cd /tmp/audiocap-domtest && npm i jsdom
//   NODE_PATH=/tmp/audiocap-domtest/node_modules node test/ui_smoke.js

'use strict';

const path = require('path');
const { JSDOM, VirtualConsole } = require('jsdom');

const ROOT = path.resolve(__dirname, '..');
const PAGE = path.join(ROOT, 'frontend', 'index.html');

let checks = 0;
let failures = 0;

function check(name, condition, detail) {
  checks++;
  if (condition) {
    console.log('  ok   ' + name);
  } else {
    failures++;
    console.log('  FAIL ' + name + (detail === undefined ? '' : ' — ' + detail));
  }
}

function eq(name, actual, expected) {
  check(name, actual === expected, 'got ' + JSON.stringify(actual)
    + ', wanted ' + JSON.stringify(expected));
}

function wait(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

// jsdom has no layout, so every rect is zero and the geometric navigator has
// nothing to work with. Fake a plausible screen: the header button top right,
// the tabs in a row, every other control stacked down the page.
function fakeLayout(window) {
  const rects = new WeakMap();
  const focusables = window.document.querySelectorAll('.focusable');
  let row = 0;

  focusables.forEach((el) => {
    let rect;
    if (el.id === 'power') {
      rect = { left: 1600, top: 40, width: 200, height: 60 };
    } else if (el.classList.contains('tab')) {
      const index = Array.prototype.indexOf.call(
        window.document.querySelectorAll('.tab'), el);
      rect = { left: 60 + index * 220, top: 160, width: 200, height: 60 };
    } else {
      rect = { left: 1200, top: 280 + row * 90, width: 360, height: 60 };
      row++;
    }
    rect.right = rect.left + rect.width;
    rect.bottom = rect.top + rect.height;
    rects.set(el, rect);
  });

  window.Element.prototype.getBoundingClientRect = function () {
    return rects.get(this) || { left: 0, top: 0, width: 0, height: 0, right: 0, bottom: 0 };
  };
}

function press(window, keyCode) {
  const event = new window.KeyboardEvent('keydown', {
    keyCode: keyCode, bubbles: true, cancelable: true,
  });
  // jsdom's KeyboardEvent ignores the legacy keyCode field.
  Object.defineProperty(event, 'keyCode', { get: () => keyCode });
  window.document.dispatchEvent(event);
}

function click(el) {
  el.dispatchEvent(new el.ownerDocument.defaultView.MouseEvent('click', { bubbles: true }));
}

async function main() {
  const errors = [];
  const virtualConsole = new VirtualConsole();
  virtualConsole.on('jsdomError', (e) => errors.push(String(e && e.message || e)));
  virtualConsole.on('error', (...args) => errors.push(args.join(' ')));

  const dom = await JSDOM.fromFile(PAGE, {
    runScripts: 'dangerously',
    resources: 'usable',
    pretendToBeVisual: true,
    virtualConsole,
  });
  const window = dom.window;
  window.addEventListener('error', (e) => errors.push(String(e.message)));

  await new Promise((resolve) => {
    if (window.document.readyState === 'complete') {
      resolve();
    } else {
      window.addEventListener('load', resolve);
    }
  });
  // The mock answers after 30 ms; give the whole load sequence room.
  await wait(250);

  const doc = window.document;
  const $ = (id) => doc.getElementById(id);

  console.log('page load');
  check('no script errors', errors.length === 0, errors.join(' | '));
  check('mock bus in use', window.Luna.available === false);
  check('settings loaded', !!(window.App.state.settings.capture));
  eq('config path shown', $('config-path').textContent.indexOf('/var/lib/webosbrew') >= 0, true);
  // This loads the raw source tree's index.html, not a packaged build, so
  // the __APP_VERSION__ placeholder was never substituted — the fallback
  // is the correct, honest thing to see here.
  eq('unpackaged run shows the dev-build fallback, not a stale version',
    window.App.state.appVersion, 'dev build');
  check('app version shown in the System panel',
    $('config-path').textContent.indexOf('dev build') >= 0);

  console.log('status feed');
  eq('starts stopped', $('state-pill').textContent, 'Stopped');
  eq('power button offers start', $('power').textContent, 'Start');
  eq('sixteen band bars', doc.querySelectorAll('.band').length, 16);
  eq('no sinks listed while stopped', $('sink-status').textContent.trim(), 'Not running.');

  console.log('panels');
  eq('six sink cards', doc.querySelectorAll('.sink-card').length, 6);
  check('hyperhdr card is first and marked',
    doc.querySelector('.sink-card .badge').textContent === 'Recommended');
  check('hyperhdr host field exists', !!doc.querySelector('[data-path="hyperhdr.host"]'));
  check('backend choice exists', !!doc.querySelector('[data-path="capture.backend"]'));
  check('log level choice exists', !!doc.querySelector('[data-path="logLevel"]'));
  check('boot toggle exists', !!doc.querySelector('[data-path="autoStart"]'));
  // The mock reports the service already running as root.
  eq('root state reflected',
    doc.querySelector('[data-path="elevate"]').textContent, 'Re-apply');
  // Conditional fields: multicast is off by default, so its TTL stays hidden.
  check('multicast ttl hidden while multicast is off',
    !doc.querySelector('[data-path="hyperhdr.multicastTtl"]'));
  // exec-only fields stay out of the way of the default pulse/alsa setup.
  check('command field hidden for automatic backend',
    !doc.querySelector('[data-path="capture.command"]'));

  console.log('editing');
  const host = doc.querySelector('[data-path="hyperhdr.host"]');
  host.value = '10.0.0.9';
  host.dispatchEvent(new window.Event('change'));
  await wait(600);
  eq('host edit reached the service', window.App.state.settings.hyperhdr.host, '10.0.0.9');

  const multicast = doc.querySelector('[data-path="hyperhdr.multicast"]');
  click(multicast);
  await wait(600);
  eq('multicast toggled', window.App.state.settings.hyperhdr.multicast, true);
  check('multicast ttl appears once enabled',
    !!doc.querySelector('[data-path="hyperhdr.multicastTtl"]'));

  const backend = doc.querySelector('[data-path="capture.backend"]');
  click(backend); // auto -> pulse
  await wait(600);
  eq('backend cycled', window.App.state.settings.capture.backend, 'pulse');
  check('server field appears for pulse',
    !!doc.querySelector('[data-path="capture.server"]'));
  check('command field still hidden for pulse',
    !doc.querySelector('[data-path="capture.command"]'));

  const udpToggle = doc.querySelector('[data-sink="udp"]');
  click(udpToggle);
  await wait(600);
  check('udp sink enabled',
    window.App.state.settings.sinks.indexOf('udp') >= 0,
    JSON.stringify(window.App.state.settings.sinks));

  console.log('running');
  click($('power'));
  await wait(300);
  eq('pill reports running', $('state-pill').textContent, 'Running');
  eq('power button offers stop', $('power').textContent, 'Stop');
  check('sinks listed while running',
    doc.querySelectorAll('.sink-line').length >= 2,
    doc.querySelectorAll('.sink-line').length + ' lines');
  check('meter moved', parseFloat($('meter-peak').firstChild.style.width) > 0,
    $('meter-peak').firstChild.style.width);
  const tallest = Array.prototype.reduce.call(doc.querySelectorAll('.band'),
    (max, b) => Math.max(max, parseFloat(b.style.height) || 0), 0);
  check('bands moved', tallest > 3, tallest + 'px');
  check('capture info filled',
    $('capture-info').textContent.indexOf('48000 Hz') >= 0,
    $('capture-info').textContent);

  click($('power'));
  await wait(300);
  eq('stops again', $('state-pill').textContent, 'Stopped');

  console.log('diagnostics');
  // Diagnostics run once automatically at boot, so the picker is already
  // there — the user should not have to press the button first.
  check('device picker already present from the boot-time diagnostics run',
    !!doc.querySelector('[data-path="capture.device"].choice'));
  click($('run-diagnostics'));
  await wait(200);
  check('diagnostics output shown',
    !$('output').classList.contains('hidden')
      && $('output').textContent.indexOf('libpulse') >= 0);
  click($('load-logs'));
  await wait(200);
  check('log output shown', $('output').textContent.indexOf('browser mock') >= 0);

  console.log('device picker');
  const picker = doc.querySelector('[data-path="capture.device"].choice');
  check('device picker appears once sources are known', !!picker);
  eq('picker starts on Automatic', picker.textContent, 'Automatic (@DEFAULT_MONITOR@)');
  click(picker); // Automatic -> tpcm_output.monitor
  await wait(600);
  eq('picking a source reaches settings',
    window.App.state.settings.capture.device, 'tpcm_output.monitor');
  eq('the plain device field reflects the pick',
    doc.querySelector('input[data-path="capture.device"]').value, 'tpcm_output.monitor');

  console.log('navigation');
  fakeLayout(window);
  const tabs = doc.querySelectorAll('.tab');
  tabs[0].focus();
  press(window, 39);
  eq('right moves along the tab row', doc.activeElement, tabs[1]);
  press(window, 37);
  eq('left comes back', doc.activeElement, tabs[0]);
  press(window, 38);
  eq('up reaches the header button', doc.activeElement, $('power'));
  press(window, 40);
  check('down leaves the header', doc.activeElement !== $('power'));

  console.log('tabs');
  click(tabs[1]);
  check('outputs panel shown', !$('panel-sinks').classList.contains('hidden'));
  check('status panel hidden', $('panel-status').classList.contains('hidden'));
  press(window, 461); // Back
  check('back returns to status', !$('panel-status').classList.contains('hidden'));

  check('still no script errors', errors.length === 0, errors.join(' | '));

  window.close();

  console.log('\n' + (checks - failures) + '/' + checks + ' checks passed');
  process.exit(failures ? 1 : 0);
}

main().catch((e) => {
  console.error(e);
  process.exit(1);
});