import {AppModel, reportError} from 'app/client/models/AppModel';
import {urlState} from 'app/client/models/gristUrlState';
import * as css from 'app/client/ui/AccountPageCss';
import {ApiKey} from 'app/client/ui/ApiKey';
import {AppHeader} from 'app/client/ui/AppHeader';
import {buildChangePasswordDialog} from 'app/client/ui/ChangePasswordDialog';
import {leftPanelBasic} from 'app/client/ui/LeftPanelCommon';
import {MFAConfig} from 'app/client/ui/MFAConfig';
import {pagePanels} from 'app/client/ui/PagePanels';
import {ThemeConfig} from 'app/client/ui/ThemeConfig';
import {createTopBarHome} from 'app/client/ui/TopBar';
import {transientInput} from 'app/client/ui/transientInput';
import {cssBreadcrumbs, separator} from 'app/client/ui2018/breadcrumbs';
import {labeledSquareCheckbox} from 'app/client/ui2018/checkbox';
import {cssLink} from 'app/client/ui2018/links';
import {getGristConfig} from 'app/common/urlUtils';
import {FullUser} from 'app/common/UserAPI';
import {Computed, Disposable, dom, domComputed, makeTestId, Observable, styled} from 'grainjs';
import {makeT} from 'app/client/lib/localization';

const testId = makeTestId('test-account-page-');
const t = makeT('AccountPage');

/**
 * Creates the account page where a user can manage their profile settings.
 */
export class AccountPage extends Disposable {
  private _apiKey = Observable.create<string>(this, '');
  private _userObs = Observable.create<FullUser|null>(this, null);
  private _isEditingName = Observable.create(this, false);
  private _nameEdit = Observable.create<string>(this, '');
  private _isNameValid = Computed.create(this, this._nameEdit, (_use, val) => checkName(val));
  private _allowGoogleLogin = Computed.create(this, (use) => use(this._userObs)?.allowGoogleLogin ?? false)
    .onWrite((val) => this._updateAllowGooglelogin(val));

  constructor(private _appModel: AppModel) {
    super();
    this._fetchAll().catch(reportError);
  }

  public buildDom() {
    const panelOpen = Observable.create(this, false);
    return pagePanels({
      leftPanel: {
        panelWidth: Observable.create(this, 240),
        panelOpen,
        hideOpener: true,
        header: dom.create(AppHeader, this._appModel.currentOrgName, this._appModel),
        content: leftPanelBasic(this._appModel, panelOpen),
      },
      headerMain: this._buildHeaderMain(),
      contentMain: this._buildContentMain(),
      testId,
    });
  }

  private _buildContentMain() {
    const {enableCustomCss} = getGristConfig();
    return domComputed(this._userObs, (user) => user && (
      css.container(css.accountPage(
        css.header(t("Account settings")),
        css.dataRow(
          css.inlineSubHeader(t("Email")),
          css.email(user.email),
        ),
        css.dataRow(
          css.inlineSubHeader(t("Name")),
          domComputed(this._isEditingName, (isEditing) => (
            isEditing ? [
              transientInput(
                {
                  initialValue: user.name,
                  save: (val) => this._isNameValid.get() && this._updateUserName(val),
                  close: () => { this._isEditingName.set(false); this._nameEdit.set(''); },
                },
                { size: '5' }, // Lower size so that input can shrink below ~152px.
                dom.on('input', (_ev, el) => this._nameEdit.set(el.value)),
                css.flexGrow.cls(''),
              ),
              css.textBtn(
                css.icon('Settings'), t("Save"),
                // No need to save on 'click'. The transient input already does it on close.
              ),
            ] : [
              css.name(user.name),
              css.textBtn(
                css.icon('Settings'), t("Edit"),
                dom.on('click', () => this._isEditingName.set(true)),
              ),
            ]
          )),
          testId('username'),
        ),
        // show warning for invalid name but not for the empty string
        dom.maybe(use => use(this._nameEdit) && !use(this._isNameValid), cssWarnings),
        css.header(t("Password & Security")),
        css.dataRow(
          css.inlineSubHeader(t("Login Method")),
          css.loginMethod(user.loginMethod),
          user.loginMethod === 'Email + Password' ? css.textBtn(t("Change Password"),
            dom.on('click', () => this._showChangePasswordDialog()),
          ) : null,
          testId('login-method'),
        ),
        user.loginMethod !== 'Email + Password' ? null : dom.frag(
          css.dataRow(
            labeledSquareCheckbox(
              this._allowGoogleLogin,
              t("Allow signing in to this account with Google"),
              testId('allow-google-login-checkbox'),
            ),
            testId('allow-google-login'),
          ),
          css.subHeader(t("Two-factor authentication")),
          css.description(
            t("Two-factor authentication is an extra layer of security for your Grist account designed to ensure that you're the only person who can access your account, even if someone knows your password.")
          ),
          dom.create(MFAConfig, user),
        ),
        // Custom CSS is incompatible with custom themes.
        enableCustomCss ? null : [
          css.header(t("Theme")),
          dom.create(ThemeConfig, this._appModel),
        ],
        css.header(t("API")),
        css.dataRow(css.inlineSubHeader(t("API Key")), css.content(
          dom.create(ApiKey, {
            apiKey: this._apiKey,
            onCreate: () => this._createApiKey(),
            onDelete: () => this._deleteApiKey(),
            anonymous: false,
            inputArgs: [{ size: '5' }], // Lower size so that input can shrink below ~152px.
          })
        )),
      ),
      testId('body'),
    )));
  }

  private _buildHeaderMain() {
    return dom.frag(
      cssBreadcrumbs({ style: 'margin-left: 16px;' },
        cssLink(
          urlState().setLinkUrl({}),
          'Home',
          testId('home'),
        ),
        separator(' / '),
        dom('span', 'Account'),
      ),
      createTopBarHome(this._appModel),
    );
  }

  private async _fetchApiKey() {
    this._apiKey.set(await this._appModel.api.fetchApiKey());
  }

  private async _createApiKey() {
    this._apiKey.set(await this._appModel.api.createApiKey());
  }

  private async _deleteApiKey() {
    await this._appModel.api.deleteApiKey();
    this._apiKey.set('');
  }

  private async _fetchUserProfile() {
    this._userObs.set(await this._appModel.api.getUserProfile());
  }

  private async _fetchAll() {
    await Promise.all([
      this._fetchApiKey(),
      this._fetchUserProfile(),
    ]);
  }

  private async _updateUserName(val: string) {
    const user = this._userObs.get();
    if (user && val && val === user.name) { return; }

    await this._appModel.api.updateUserName(val);
    await this._fetchAll();
  }

  private async _updateAllowGooglelogin(allowGoogleLogin: boolean) {
    await this._appModel.api.updateAllowGoogleLogin(allowGoogleLogin);
    await this._fetchUserProfile();
  }

  private _showChangePasswordDialog() {
    return buildChangePasswordDialog();
  }
}

/**
 * We allow alphanumeric characters and certain common whitelisted characters (except at the start),
 * plus everything non-ASCII (for non-English alphabets, which we want to allow but it's hard to be
 * more precise about what exactly to allow).
 */
// eslint-disable-next-line no-control-regex
const VALID_NAME_REGEXP = /^(\w|[^\u0000-\u007F])(\w|[- ./'"()]|[^\u0000-\u007F])*$/;

/**
 * Test name against various rules to check if it is a valid username.
 */
export function checkName(name: string): boolean {
  return VALID_NAME_REGEXP.test(name);
}

/**
 * Builds dom to show marning messages to the user.
 */
function buildNameWarningsDom() {
  return css.warning(
    t("Names only allow letters, numbers and certain special characters"),
    testId('username-warning'),
  );
}

const cssWarnings = styled(buildNameWarningsDom, `
  margin: -8px 0 0 110px;
`);