import {makeT} from 'app/client/lib/localization';
import {localStorageObs} from 'app/client/lib/localStorageObs';
import {getStorage} from 'app/client/lib/storage';
import {tokenFieldStyles} from 'app/client/lib/TokenField';
import {AppModel} from 'app/client/models/AppModel';
import {urlState} from 'app/client/models/gristUrlState';
import {TelemetryModel, TelemetryModelImpl} from 'app/client/models/TelemetryModel';
import {basicButton, basicButtonLink, bigPrimaryButton} from 'app/client/ui2018/buttons';
import {colors, isNarrowScreenObs, testId, theme, vars} from 'app/client/ui2018/cssVars';
import {icon} from 'app/client/ui2018/icons';
import {cssLink} from 'app/client/ui2018/links';
import {commonUrls, isFeatureEnabled} from 'app/common/gristUrls';
import {getGristConfig} from 'app/common/urlUtils';
import {Computed, Disposable, dom, DomContents, Observable, styled, UseCB} from 'grainjs';

const t = makeT('SupportGristNudge');

type ButtonState =
  | 'collapsed'
  | 'expanded';

/**
 * Nudges users to support Grist by opting in to telemetry or sponsoring on Github.
 *
 * For installation admins, this includes a card with a nudge which collapses into a "Support
 * Grist" button in the top bar. When that's not applicable, it is only a "Support Grist" button
 * that links to the Github sponsorship page.
 *
 * Users can dismiss these nudges.
 */
export class SupportGristNudge extends Disposable {
  private readonly _telemetryModel: TelemetryModel = TelemetryModelImpl.create(this, this._appModel);

  private readonly _buttonStateKey = `u=${this._appModel.currentValidUser?.id ?? 0};supportGristNudge`;
  private _buttonState = localStorageObs(this._buttonStateKey, 'expanded') as Observable<ButtonState>;

  // Whether the nudge just got accepted, and we should temporarily show the "Thanks" version.
  private _justAccepted = Observable.create(this, false);

  private _showButton: Computed<null|'link'|'expand'>;
  private _showNudge: Computed<null|'normal'|'accepted'>;

  constructor(private _appModel: AppModel) {
    super();
    const {deploymentType, telemetry} = getGristConfig();
    const isEnabled = (deploymentType === 'core') && isFeatureEnabled("supportGrist");
    const isAdmin = _appModel.isInstallAdmin();
    const isTelemetryOn = (telemetry && telemetry.telemetryLevel !== 'off');
    const isAdminNudgeApplicable = isAdmin && !isTelemetryOn;

    const generallyHide = (use: UseCB) => (
      !isEnabled ||
      use(_appModel.dismissedPopups).includes('supportGrist') ||
      use(isNarrowScreenObs())
    );

    this._showButton = Computed.create(this, use => {
      if (generallyHide(use)) { return null; }
      if (!isAdminNudgeApplicable) { return 'link'; }
      if (use(this._buttonState) !== 'expanded') { return 'expand'; }
      return null;
    });

    this._showNudge = Computed.create(this, use => {
      if (use(this._justAccepted)) { return 'accepted'; }
      if (generallyHide(use)) { return null; }
      if (isAdminNudgeApplicable && use(this._buttonState) === 'expanded') { return 'normal'; }
      return null;
    });
  }

  public buildTopBarButton(): DomContents {
    return dom.domComputed(this._showButton, (which) => {
      if (!which) { return null; }
      const elemType = (which === 'link') ? basicButtonLink : basicButton;
      return cssContributeButton(
        elemType(cssHeartIcon('💛 '), t('Support Grist'),
          (which === 'link' ?
            {href: commonUrls.githubSponsorGristLabs, target: '_blank'} :
            dom.on('click', () => this._buttonState.set('expanded'))
          ),

          cssContributeButtonCloseButton(
            icon('CrossSmall'),
            dom.on('click', (ev) => {
              ev.stopPropagation();
              ev.preventDefault();
              this._dismissAndClose();
            }),
            testId('support-grist-button-dismiss'),
          ),
          testId('support-grist-button'),
        )
      );
    });
  }

  public buildNudgeCard() {
    return dom.domComputed(this._showNudge, nudge => {
      if (!nudge) { return null; }
      return cssCard(
        (nudge === 'normal' ?
          this._buildSupportGristCardContent() :
          this._buildOptedInCardContent()
        ),
        testId('support-nudge'),
      );
    });
  }

  private _buildSupportGristCardContent() {
    return [
      cssCloseButton(
        icon('CrossBig'),
        dom.on('click', () => this._buttonState.set('collapsed')),
        testId('support-nudge-close'),
      ),
      cssLeftAlignedHeader(t('Support Grist')),
      cssParagraph(t(
        'Opt in to telemetry to help us understand how the product ' +
        'is used, so that we can prioritize future improvements.'
      )),
      cssParagraph(
        t(
          'We only collect usage statistics, as detailed in our {{helpCenterLink}}, never ' +
          'document contents. Opt out any time from the {{supportGristLink}} in the user menu.',
          {
            helpCenterLink: helpCenterLink(),
            supportGristLink: adminPanelLink(),
          },
        ),
      ),
      cssFullWidthButton(
        t('Opt in to Telemetry'),
        dom.on('click', () => this._optInToTelemetry()),
        testId('support-nudge-opt-in'),
      ),
    ];
  }

  private _buildOptedInCardContent() {
    return [
      cssCloseButton(
        icon('CrossBig'),
        dom.on('click', () => this._justAccepted.set(false)),
        testId('support-nudge-close'),
      ),
      cssCenteredFlex(cssSparks()),
      cssCenterAlignedHeader(t('Opted In')),
      cssParagraph(
        t(
          'Thank you! Your trust and support is greatly appreciated.\
 Opt out any time from the {{link}} in the user menu.',
          {link: adminPanelLink()},
        ),
      ),
      cssCenteredFlex(
        cssPrimaryButton(
          t('Close'),
          dom.on('click', () => this._justAccepted.set(false)),
          testId('support-nudge-close-button'),
        ),
      ),
    ];
  }

  private _markDismissed() {
    this._appModel.dismissPopup('supportGrist', true);
    // Also cleanup the no-longer-needed button state from localStorage.
    getStorage().removeItem(this._buttonStateKey);
  }

  private _dismissAndClose() {
    this._markDismissed();
    this._justAccepted.set(false);
  }

  private async _optInToTelemetry() {
    await this._telemetryModel.updateTelemetryPrefs({telemetryLevel: 'limited'});
    this._markDismissed();
    this._justAccepted.set(true);
  }
}

function helpCenterLink() {
  return cssLink(
    t('Help Center'),
    {href: commonUrls.helpTelemetryLimited, target: '_blank'},
  );
}

function adminPanelLink() {
  return cssLink(
    t('Admin Panel'),
    {href: urlState().makeUrl({adminPanel: 'admin'}), target: '_blank'},
  );
}

const cssCenteredFlex = styled('div', `
  display: flex;
  justify-content: center;
  align-items: center;
`);

const cssContributeButton = styled('div', `
  margin-left: 8px;
  margin-right: 8px;
`);

const cssContributeButtonCloseButton = styled(tokenFieldStyles.cssDeleteButton, `
  margin-left: 4px;
  vertical-align: bottom;
  line-height: 1;
  position: absolute;
  top: -4px;
  right: -8px;
  border-radius: 16px;
  background-color: ${colors.dark};
  width: 18px;
  height: 18px;
  cursor: pointer;
  z-index: 1;
  display: none;
  align-items: center;
  justify-content: center;
  --icon-color: ${colors.light};

  .${cssContributeButton.className}:hover & {
    display: flex;
  }
  &:hover {
    --icon-color: ${colors.lightGreen};
  }
`);

const cssCard = styled('div', `
  width: 297px;
  padding: 24px;
  color: ${theme.announcementPopupFg};
  background: ${theme.announcementPopupBg};
  border-radius: 4px;
  align-self: flex-start;
  position: sticky;
  flex-shrink: 0;
  top: 0px;
`);

const cssHeader = styled('div', `
  font-size: ${vars.xxxlargeFontSize};
  font-weight: 600;
  margin-bottom: 16px;
`);

const cssLeftAlignedHeader = styled(cssHeader, `
  text-align: left;
`);

const cssCenterAlignedHeader = styled(cssHeader, `
  text-align: center;
`);

const cssParagraph = styled('div', `
  font-size: 13px;
  line-height: 18px;
  margin-bottom: 12px;
`);

const cssPrimaryButton = styled(bigPrimaryButton, `
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 32px;
  text-align: center;
`);

const cssFullWidthButton = styled(cssPrimaryButton, `
  width: 100%;
`);

const cssCloseButton = styled('div', `
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px;
  border-radius: 4px;
  cursor: pointer;
  --icon-color: ${theme.popupCloseButtonFg};

  &:hover {
    background-color: ${theme.hover};
  }
`);

const cssSparks = styled('div', `
  height: 48px;
  width: 48px;
  background-image: var(--icon-Sparks);
  display: inline-block;
  background-repeat: no-repeat;
`);

// This is just to avoid the emoji pushing the button to be taller.
const cssHeartIcon = styled('span', `
  line-height: 1;
`);