'use strict';

const assert = require('assert');
const { changeLanguageFromPage, _private } = require('../src/services/language_service');

class FakeElement {
  constructor({ aria = '', text = '', attrs = {}, box = { x: 0, y: 200, width: 48, height: 48 }, visible = true, disabled = false, hasSvg = false, onClick = null, onFill = null, children = null } = {}) {
    this.aria = aria;
    this.text = text;
    this.attrs = attrs;
    this.box = box;
    this.visible = visible;
    this.disabled = disabled;
    this.hasSvg = hasSvg;
    this.onClick = onClick;
    this.onFill = onFill;
    this.children = children;
  }

  async boundingBox() { return this.visible ? this.box : null; }
  async isVisible() { return this.visible; }
  async isDisabled() { return this.disabled; }
  async getAttribute(name) { return name === 'aria-label' ? this.aria : (this.attrs[name] ?? null); }
  async textContent() { return this.text; }
  async $(selector) { return selector === 'svg' && this.hasSvg ? {} : null; }
  async $$(selector) { return this.children ? this.children(selector) : []; }
  async click() { if (this.onClick) await this.onClick(); }
  async fill(value) { if (this.onFill) await this.onFill(value); }
}

class FakeLanguagePage {
  constructor(editorDelayMs = 2200, saveBehavior = 'apply') {
    this.editorDelayMs = editorDelayMs;
    this.saveBehavior = saveBehavior;
    this.editorVisibleAt = Infinity;
    this.mode = 'page';
    this.query = '';
    this.usSelected = false;
    this.currentTitle = 'Bahasa';
    this.currentUrl = 'about:blank';
    this.gotoCount = 0;
    this.cancelClicked = false;
    this._listeners = new Map();
    this._mainFrame = { url: () => this.currentUrl };

    this.headerButton = new FakeElement({
      aria: 'Bantuan',
      box: { x: 900, y: 20, width: 48, height: 48 },
      hasSvg: true,
    });
    this.pencilButton = new FakeElement({
      aria: 'Edit bahasa: Indonesia (Indonesia)',
      box: { x: 760, y: 412, width: 48, height: 48 },
      hasSvg: true,
      onClick: () => { this.editorVisibleAt = Date.now() + this.editorDelayMs; },
    });
    this.input = new FakeElement({
      box: { x: 300, y: 200, width: 400, height: 48 },
      onFill: value => { this.query = value; },
    });
    this.englishOption = new FakeElement({
      text: '\u200eEnglish\u200f',
      box: { x: 300, y: 300, width: 300, height: 48 },
      onClick: () => { this.mode = 'region'; },
    });
    this.ukOption = new FakeElement({ text: 'United Kingdom', box: { x: 300, y: 300, width: 300, height: 48 } });
    this.usOption = new FakeElement({
      text: 'United States',
      box: { x: 300, y: 360, width: 300, height: 48 },
      onClick: () => { this.usSelected = true; },
    });
    this.cancelButton = new FakeElement({
      text: 'Batal',
      aria: 'Batalkan penambahan bahasa',
      box: { x: 400, y: 700, width: 80, height: 40 },
      onClick: () => {
        this.cancelClicked = true;
        this.mode = 'saved';
      },
    });
    this.backButton = new FakeElement({
      text: 'Kembali',
      aria: 'Kembali ke pilihan bahasa',
      box: { x: 500, y: 700, width: 80, height: 40 },
    });
    this.saveButton = new FakeElement({
      text: 'Simpan',
      aria: 'Simpan pilihan bahasa Anda',
      box: { x: 600, y: 700, width: 80, height: 40 },
      onClick: () => {
        assert(this.usSelected, '保存前应先选择 United States');
        this.mode = 'saved';
        if (this.saveBehavior === 'apply') {
          this.currentTitle = 'Language';
          this.pencilButton.aria = 'Edit language: English (United States)';
        }
        if (this.saveBehavior === 'apply' || this.saveBehavior === 'close_without_apply') {
          this.emitMainNavigation('https://myaccount.google.com/language?refresh_reason=primary');
        }
      },
    });
    this.dialogBeforeSelection = new FakeElement({
      box: { x: 200, y: 100, width: 600, height: 700 },
      children: selector => this.dialogChildren(selector, false),
    });
    this.dialogAfterSelection = new FakeElement({
      box: { x: 200, y: 100, width: 600, height: 700 },
      children: selector => this.dialogChildren(selector, true),
    });
  }

  editorVisible() {
    return this.mode !== 'saved' && Date.now() >= this.editorVisibleAt;
  }

  dialogChildren(selector, selectedHandle) {
    if (!this.editorVisible()) return [];
    // 模拟 Google 在选中地区后卸载旧 dialog 并挂载新节点。
    if (selectedHandle !== this.usSelected) return [];
    if (selector === 'input') return this.mode === 'page' ? [this.input] : [];
    if (selector === '[role="option"]') {
      if (this.mode === 'page') return this.query === 'English' ? [this.englishOption] : [];
      if (this.mode === 'region') return [this.ukOption, this.usOption];
    }
    if (selector === 'button') {
      if (this.mode === 'region') {
        if (this.saveBehavior === 'cancel_last') return [this.backButton, this.cancelButton];
        return [this.cancelButton, this.backButton, this.saveButton];
      }
      return [this.cancelButton, this.saveButton];
    }
    return [];
  }

  on(event, handler) {
    if (!this._listeners.has(event)) this._listeners.set(event, new Set());
    this._listeners.get(event).add(handler);
  }
  off(event, handler) { this._listeners.get(event)?.delete(handler); }
  listenerCount(event) { return this._listeners.get(event)?.size || 0; }
  mainFrame() { return this._mainFrame; }
  emitFrameNavigation(frame) {
    for (const handler of this._listeners.get('framenavigated') || []) handler(frame);
  }
  emitMainNavigation(url) {
    this.currentUrl = url;
    this.emitFrameNavigation(this._mainFrame);
  }
  async goto(url) { this.gotoCount++; this.emitMainNavigation(url); }
  url() { return this.currentUrl; }
  async title() { return this.currentTitle; }
  async waitForURL(predicate, { timeout = 1000 } = {}) {
    const matches = () => {
      try { return !!predicate(new URL(this.currentUrl)); } catch (_) { return false; }
    };
    if (matches()) return;
    await new Promise((resolve, reject) => {
      const handler = () => {
        if (!matches()) return;
        clearTimeout(timer);
        this.off('framenavigated', handler);
        resolve();
      };
      const timer = setTimeout(() => {
        this.off('framenavigated', handler);
        reject(new Error(`waitForURL: Timeout ${timeout}ms exceeded`));
      }, timeout);
      this.on('framenavigated', handler);
    });
  }
  async waitForLoadState() { }
  async waitForTimeout(ms) { await new Promise(resolve => setTimeout(resolve, ms)); }
  async $$(selector) {
    if (selector === 'button') return [this.headerButton, this.pencilButton];
    if (selector === '[role="dialog"]') {
      if (!this.editorVisible()) return [];
      return [this.usSelected ? this.dialogAfterSelection : this.dialogBeforeSelection];
    }
    if (selector === 'input' || selector === '[role="option"]') return [];
    return [];
  }
}

class NavigationProbePage extends FakeLanguagePage {
  constructor(navigationMode) {
    super(0, 'apply');
    this.navigationMode = navigationMode;
    this.currentUrl = navigationMode === 'old_primary'
      ? 'https://myaccount.google.com/language?refresh_reason=primary'
      : 'https://myaccount.google.com/language';
  }

  async goto(url) {
    this.gotoCount++;
    if (this.navigationMode === 'expected_primary' || this.navigationMode === 'expected_abort') {
      const primary = 'https://myaccount.google.com/language?refresh_reason=primary';
      this.pencilButton.aria = 'Edit language: English (United States)';
      this.emitMainNavigation(primary);
      if (this.navigationMode === 'expected_abort') {
        throw new Error(`page.goto: net::ERR_ABORTED at ${url}`);
      }
      throw new Error(`page.goto: Navigation to "${url}" is interrupted by another navigation to "${primary}"`);
    }
    if (this.navigationMode === 'other_url') {
      const other = 'https://accounts.google.com/v3/signin/identifier';
      this.emitMainNavigation(other);
      throw new Error(`page.goto: Navigation to "${url}" is interrupted by another navigation to "${other}"`);
    }
    if (this.navigationMode === 'timeout') {
      throw new Error('page.goto: Timeout 45000ms exceeded');
    }
    if (this.navigationMode === 'proxy') {
      throw new Error('page.goto: net::ERR_TUNNEL_CONNECTION_FAILED');
    }
    if (this.navigationMode === 'page_closed') {
      throw new Error('page.goto: Target page, context or browser has been closed');
    }
    if (this.navigationMode === 'old_primary') {
      throw new Error(`page.goto: net::ERR_ABORTED at ${url}`);
    }
    if (this.navigationMode === 'subframe_primary') {
      const childFrame = {
        url: () => 'https://myaccount.google.com/language?refresh_reason=primary',
      };
      this.emitFrameNavigation(childFrame);
      throw new Error(`page.goto: net::ERR_ABORTED at ${url}`);
    }
    if (this.navigationMode === 'resolved_login') {
      this.emitMainNavigation('https://accounts.google.com/v3/signin/identifier');
      return;
    }
    if (this.navigationMode === 'resolved_chrome_error') {
      this.emitMainNavigation('chrome-error://chromewebdata/');
      return;
    }
    return super.goto(url);
  }
}

(async () => {
  assert.strictEqual(
    _private.isEnglishUnitedStatesLabel('Edit bahasa: English (Amerika Serikat)'),
    true,
    '应识别印尼语地区名称',
  );
  assert.strictEqual(
    _private.isEnglishUnitedStatesLabel('Ubah bahasa: Inggris (Amerika Serikat)'),
    true,
    '应识别完全印尼语的英语（美国）标签',
  );

  const option = new FakeElement({ text: '\u200eEnglish\u2069' });
  const optionRoot = { $$: async () => [option] };
  assert.strictEqual(await _private.findOptionByText(optionRoot, 'English'), option, '应忽略双向文本控制字符');

  const inlineInput = new FakeElement({ box: { x: 10, y: 10, width: 100, height: 20 } });
  const inlineOption = new FakeElement({ text: 'English', box: { x: 10, y: 40, width: 100, height: 20 } });
  const inlinePage = {
    $$: async selector => {
      if (selector === '[role="dialog"]') return [];
      if (selector === 'input') return [inlineInput];
      if (selector === '[role="option"]') return [inlineOption];
      return [];
    },
  };
  assert.strictEqual(await _private.findVisibleEditorRoot(inlinePage), inlinePage, '应兼容页面内嵌编辑器');

  for (const saveButton of [
    new FakeElement({ text: 'Save', aria: 'Save your language preference' }),
    new FakeElement({ text: '保存', aria: '保存您的语言偏好设置' }),
    new FakeElement({ text: 'Continue', attrs: { 'data-mdc-dialog-action': 'confirm' } }),
  ]) {
    const cancel = new FakeElement({ text: 'Cancel', aria: 'Cancel language change' });
    const dialog = { $$: async () => [cancel, saveButton] };
    assert.strictEqual(await _private.findSaveButton(dialog), saveButton, '应按按钮语义识别保存动作');
  }

  const expectedPrimaryPage = new NavigationProbePage('expected_primary');
  const expectedConfirmation = await _private.confirmEnglishUnitedStates(expectedPrimaryPage, () => {});
  assert.strictEqual(expectedConfirmation.confirmed, true, '本次主 frame primary refresh 应继续并完成最终确认');
  assert.strictEqual(expectedPrimaryPage.listenerCount('framenavigated'), 0, '成功恢复后应解绑监听');

  const expectedAbortPage = new NavigationProbePage('expected_abort');
  const expectedAbortResult = await _private.navigateLanguagePageSafely(expectedAbortPage);
  assert.strictEqual(expectedAbortResult.primaryRefresh, true, '本次主 frame primary 导航导致的 ERR_ABORTED 应可恢复');
  assert.strictEqual(expectedAbortPage.listenerCount('framenavigated'), 0);

  const otherUrlPage = new NavigationProbePage('other_url');
  await assert.rejects(
    () => _private.navigateLanguagePageSafely(otherUrlPage, null, { primaryRefreshTimeoutMs: 40 }),
    /accounts\.google\.com\/v3\/signin/,
    '被其他 URL 中断必须原样失败',
  );
  assert.strictEqual(otherUrlPage.listenerCount('framenavigated'), 0);

  for (const [mode, errorPattern] of [
    ['timeout', /Timeout 45000ms exceeded/],
    ['proxy', /ERR_TUNNEL_CONNECTION_FAILED/],
    ['page_closed', /has been closed/],
    ['old_primary', /ERR_ABORTED/],
    ['subframe_primary', /ERR_ABORTED/],
    ['resolved_login', /语言页导航到了意外地址/],
    ['resolved_chrome_error', /语言页导航到了意外地址/],
  ]) {
    const failurePage = new NavigationProbePage(mode);
    await assert.rejects(
      () => _private.navigateLanguagePageSafely(failurePage, null, { primaryRefreshTimeoutMs: 40 }),
      errorPattern,
      `${mode} 不得被当成可恢复的 primary refresh`,
    );
    assert.strictEqual(failurePage.listenerCount('framenavigated'), 0, `${mode} 后应解绑监听`);
  }

  const page = new FakeLanguagePage(2200);
  const logs = [];
  const startedAt = Date.now();
  const [ok, message] = await changeLanguageFromPage(page, line => logs.push(line));
  const elapsed = Date.now() - startedAt;

  assert.strictEqual(ok, true, message);
  assert(elapsed >= 2000, '测试应覆盖点击两秒后编辑器仍未出现的场景');
  assert.strictEqual(page.usSelected, true);
  assert.strictEqual(page.currentUrl, 'https://myaccount.google.com/language?refresh_reason=primary');
  assert.strictEqual(page.listenerCount('framenavigated'), 0, '完成后应解绑导航监听');
  assert(logs.some(line => line.includes('语言已成功更改')));

  const cancelLastPage = new FakeLanguagePage(0, 'cancel_last');
  const [cancelLastOk, cancelLastMessage] = await changeLanguageFromPage(cancelLastPage, () => {});
  assert.strictEqual(cancelLastOk, false, '最后一个按钮为取消时不得当作保存');
  assert(cancelLastMessage.includes('保存按钮'));
  assert.strictEqual(cancelLastPage.cancelClicked, false, '不得点击被明确识别为取消的按钮');

  const notAppliedPage = new FakeLanguagePage(0, 'close_without_apply');
  const [notAppliedOk, notAppliedMessage] = await changeLanguageFromPage(notAppliedPage, () => {});
  assert.strictEqual(notAppliedOk, false, '弹窗关闭但语言未应用时必须失败');
  assert(notAppliedMessage.includes('复查语言未变为'));
  assert(notAppliedPage.gotoCount >= 3, '未生效时应进行两次重新加载确认');

  console.log('language_service.test.js: PASS');
})().catch(error => {
  console.error(error && error.stack ? error.stack : error);
  process.exitCode = 1;
});