const test = require('node:test');
const assert = require('node:assert/strict');
const { EventEmitter } = require('node:events');
const fs = require('node:fs');
const path = require('node:path');
const { configureStartupRenderer, createStartupWindow, resolveStartupLanguage, createStartupQuery } = require('../lib/startup-renderer');

class TestBrowserWindow extends EventEmitter {
  constructor(options) {
    super();
    this.webContents = new EventEmitter();
    this.options = options;
    this.showCalls = 0;
    this.startupEvents = [];
    this.loadError = new Error('renderer load failed');
    this.loadOptions = null;
  }

  once(eventName, listener) {
    this.startupEvents.push(`listen:${eventName}`);
    return super.once(eventName, listener);
  }

  show() {
    this.showCalls++;
  }

  loadFile(target, options) {
    this.startupEvents.push(`load:${target}`);
    this.loadOptions = options;
    return this.loadError ? Promise.reject(this.loadError) : Promise.resolve();
  }
}

test('configureStartupRenderer leaves hardware acceleration enabled for a local Windows session', () => {
  let calls = 0;
  configureStartupRenderer({ disableHardwareAcceleration() { calls++; } }, { SESSIONNAME: 'Console' }, 'win32');
  assert.equal(calls, 0);
});

test('configureStartupRenderer disables hardware acceleration for a Windows Remote Desktop session', () => {
  let calls = 0;
  configureStartupRenderer({ disableHardwareAcceleration() { calls++; } }, { SESSIONNAME: 'RDP-Tcp#12' }, 'win32');
  assert.equal(calls, 1);
});

test('resolveStartupLanguage accepts only the supported persisted language', () => {
  assert.equal(resolveStartupLanguage({ globalSettings: { language: 'de' } }), 'de');
  assert.equal(resolveStartupLanguage({ globalSettings: { language: 'en' } }), 'en');
  assert.equal(resolveStartupLanguage({ globalSettings: { language: 'fr' } }), 'en');
  assert.equal(resolveStartupLanguage(null), 'en');
});

test('startup query carries language and installed version into the first renderer frame', () => {
  assert.deepEqual(createStartupQuery({ globalSettings: { language: 'de' } }, '2.1.25'), {
    language: 'de',
    version: '2.1.25'
  });
  assert.deepEqual(createStartupQuery(null, 'invalid'), { language: 'en', version: '' });
});

test('createStartupWindow forces the main window to start hidden', () => {
  const startup = createStartupWindow(TestBrowserWindow, { width: 1100, show: true });

  assert.equal(startup.window.options.width, 1100);
  assert.equal(startup.window.options.show, false);
});

test('main window uses the branded application icon', () => {
  const projectRoot = path.join(__dirname, '..');
  const mainSource = fs.readFileSync(path.join(projectRoot, 'main.js'), 'utf8');
  const createWindowStart = mainSource.indexOf('function createWindow()');
  const createWindowEnd = mainSource.indexOf('\nfunction createTray()', createWindowStart);
  const createWindowSource = mainSource.slice(createWindowStart, createWindowEnd);

  assert.equal(fs.existsSync(path.join(projectRoot, 'assets', 'app_icon.ico')), true);
  assert.match(createWindowSource, /icon:\s*path\.join\(__dirname, ['"]assets['"], ['"]app_icon\.ico['"]\)/u);
});

test('startup load registers visibility before navigation and shows only once', async () => {
  const startup = createStartupWindow(TestBrowserWindow, {});
  startup.window.loadError = null;
  const loading = startup.load('renderer/index.html', () => {});

  assert.deepEqual(startup.window.startupEvents, [
    'listen:ready-to-show',
    'load:renderer/index.html'
  ]);

  startup.window.emit('ready-to-show');
  assert.equal(startup.window.showCalls, 0);
  startup.window.webContents.emit('did-finish-load');
  startup.window.emit('ready-to-show');
  startup.window.webContents.emit('did-finish-load');
  await loading;

  assert.equal(startup.window.showCalls, 1);
});

test('startup waits for native paint readiness when renderer loading finishes first', () => {
  const startup = createStartupWindow(TestBrowserWindow, {});

  startup.window.webContents.emit('did-finish-load');
  assert.equal(startup.window.showCalls, 0);
  startup.window.emit('ready-to-show');
  assert.equal(startup.window.showCalls, 1);
});

test('startup load forwards a rejected navigation to the error handler', async () => {
  const startup = createStartupWindow(TestBrowserWindow, {});
  let handledError;

  await startup.load('renderer/index.html', (err) => {
    handledError = err;
  });

  assert.equal(handledError, startup.window.loadError);
});

test('startup load forwards navigation options before the renderer becomes visible', async () => {
  const startup = createStartupWindow(TestBrowserWindow, {});
  const options = { query: { language: 'de' } };

  await startup.load('renderer/index.html', () => {}, options);

  assert.deepEqual(startup.window.loadOptions, options);
});

test('desktop drag and drop is accepted before asynchronous renderer initialization', () => {
  const projectRoot = path.join(__dirname, '..');
  const appSource = fs.readFileSync(path.join(projectRoot, 'renderer', 'app.js'), 'utf8');
  const earlyBinding = appSource.lastIndexOf('\nsetupDragDrop();');
  const initialization = appSource.lastIndexOf('\ninit().then(');

  assert.notEqual(earlyBinding, -1);
  assert.notEqual(initialization, -1);
  assert.ok(earlyBinding < initialization);
  assert.match(appSource, /dataTransfer\.dropEffect\s*=\s*['"]copy['"]/u);
});

test('upload sidebar renders and updates the remaining upload size', () => {
  const projectRoot = path.join(__dirname, '..');
  const html = fs.readFileSync(path.join(projectRoot, 'renderer', 'index.html'), 'utf8');
  const appSource = fs.readFileSync(path.join(projectRoot, 'renderer', 'app.js'), 'utf8');

  assert.match(html, /Verbleibende Größe[\s\S]*id="uploadTelemetryRemainingSize"[^>]*>0 B</u);
  assert.match(appSource, /_setUploadTelemetryText\(['"]uploadTelemetryRemainingSize['"],\s*formatBytes\(stats\.bytesRemaining\)\)/u);
});

test('header occupies its final geometry before asynchronous initialization', () => {
  const projectRoot = path.join(__dirname, '..');
  const html = fs.readFileSync(path.join(projectRoot, 'renderer', 'index.html'), 'utf8');
  const appSource = fs.readFileSync(path.join(projectRoot, 'renderer', 'app.js'), 'utf8');
  const mainSource = fs.readFileSync(path.join(projectRoot, 'main.js'), 'utf8');
  const css = fs.readFileSync(path.join(projectRoot, 'renderer', 'styles.css'), 'utf8');
  const updateButton = html.match(/<button class="header-update-button"[^>]*id="headerUpdateBtn"[^>]*>/u)?.[0] || '';
  const updateSlotIndex = html.indexOf('class="header-update-slot"');
  const speedWidgetIndex = html.indexOf('id="uploadSpeedSparkline"');
  const firstFrameInitialization = appSource.lastIndexOf('\ninitializeStaticHeader();');
  const asynchronousInitialization = appSource.lastIndexOf('\ninit().then(');

  assert.doesNotMatch(updateButton, /\shidden(?:\s|>)/u);
  assert.doesNotMatch(updateButton, /\stitle=/u);
  assert.ok(updateSlotIndex >= 0 && updateSlotIndex < speedWidgetIndex);
  assert.match(css, /\.header-update-slot\s*\{[^}]*width:\s*0;[^}]*flex:\s*0 0 0;[^}]*overflow:\s*hidden;/su);
  assert.match(css, /\.header-update-slot\.is-visible\s*\{[^}]*width:\s*146px;[^}]*flex-basis:\s*146px;/su);
  assert.match(css, /\.header-update-slot\.is-visible\s+\.header-update-button\s*\{[^}]*opacity:\s*1;[^}]*transform:\s*translateX\(0\);/su);
  assert.match(css, /\.version-badge\s*\{[^}]*min-width:\s*48px;/su);
  assert.notEqual(firstFrameInitialization, -1);
  assert.ok(firstFrameInitialization < asynchronousInitialization);
  assert.match(mainSource, /createStartupQuery\([^,]+,\s*app\.getVersion\(\)\)/u);
  assert.doesNotMatch(mainSource, /runAutomaticUpdateCheck\(true\);\s*\},\s*3000\)/u);
  assert.match(html, /class="upload-speed-baseline"/u);
  assert.match(css, /\.upload-speed-baseline\s*\{[^}]*background:\s*var\(--success\);/su);
  assert.match(css, /\.header-update-button\.update-available\s*\{[^}]*background:\s*var\(--success\);[^}]*color:\s*#000;/su);
  assert.match(css, /\.header-update-button\.update-available:hover\s*\{[^}]*background:\s*var\(--success-end\);[^}]*color:\s*#000;/su);
  assert.match(css, /\.update-dialog\s*\{[^}]*width:\s*min\(576px,\s*100%\);/su);
  assert.match(css, /\.update-release-notes\s*\{[^}]*height:\s*min\(264px,\s*48vh\);/su);
  assert.match(html, /class="update-progress-footer"[\s\S]*id="updateProgressDetails"[\s\S]*id="updateProgressSize"[\s\S]*id="updateProgressSpeed"[\s\S]*id="updateProgressEta"[\s\S]*id="updateProgressText"/u);
  assert.match(html, /id="queueFilterResetBtn"[^>]*disabled[^>]*>Filter zurücksetzen</u);
  assert.match(html, /class="queue-filter-summary"[\s\S]*id="queueActiveFilterCount"[^>]*>0</u);
  assert.doesNotMatch(html, /<\/div>\s*<div class="queue-filter-bar"/u);
  assert.match(css, /\.queue-filter-bar\s*\{[^}]*display:\s*flex;[^}]*margin-left:\s*auto;[^}]*border:\s*1px solid var\(--border\);[^}]*border-radius:\s*7px;/su);
  assert.match(css, /#updateProgressDetails\s*\{[^}]*display:\s*grid;[^}]*grid-template-columns:\s*19ch 2ch 11ch 2ch 10ch;[^}]*column-gap:\s*0;[^}]*font-variant-numeric:\s*tabular-nums;/su);
  assert.match(css, /\.update-progress-separator\s*\{[^}]*display:\s*grid;[^}]*place-items:\s*center;/su);
  assert.match(css, /#updateProgressSpeed\s*\{[^}]*text-align:\s*right;/su);
  assert.match(css, /#updateProgressEta\s*\{[^}]*text-align:\s*left;/su);
  assert.match(css, /\.update-release-heading\s*\{[^}]*color:\s*var\(--success\);[^}]*font-size:\s*14px;[^}]*font-weight:\s*750;/su);
  assert.match(css, /\.update-release-category\s*\{[^}]*font-size:\s*13px;[^}]*font-weight:\s*700;/su);
  assert.match(css, /#updateProgressDetails\[hidden\]\s*\{[^}]*display:\s*none;/su);
});