// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* eslint-disable @devtools/no-lit-render-outside-of-view, @devtools/enforce-custom-element-definitions-location */

import '../../kit/kit.js';

import * as Common from '../../../core/common/common.js';
import type * as Host from '../../../core/host/host.js';
import * as i18n from '../../../core/i18n/i18n.js';
import {html, render} from '../../lit/lit.js';

import surveyLinkStyles from './surveyLink.css.js';

const UIStrings = {
  /**
   * @description Text shown when the link to open a survey is clicked but the survey has not yet appeared
   */
  openingSurvey: 'Opening survey …',
  /**
   * @description Text displayed instead of the survey link after the survey link is clicked, if the survey was shown successfully
   */
  thankYouForYourFeedback: 'Thank you for your feedback',
  /**
   * @description Text displayed instead of the survey link after the survey link is clicked, if the survey was not shown successfully
   */
  anErrorOccurredWithTheSurvey: 'An error occurred with the survey',
} as const;
const str_ = i18n.i18n.registerUIStrings('ui/components/survey_link/SurveyLink.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

export type CanShowSurveyCallback = (result: Host.InspectorFrontendHostAPI.CanShowSurveyResult) => void;
export type ShowSurveyCallback = (result: Host.InspectorFrontendHostAPI.ShowSurveyResult) => void;

export interface SurveyLinkData {
  trigger: string;
  promptText: Common.UIString.LocalizedString;
  canShowSurvey: (trigger: string, callback: CanShowSurveyCallback) => void;
  showSurvey: (trigger: string, callback: ShowSurveyCallback) => void;
}

const enum State {
  CHECKING = 'Checking',   // (begin state) -> SHOW_LINK | DONT_SHOW_LINK
  SHOW_LINK = 'ShowLink',  // -> SENDING
  SENDING = 'Sending',     // -> SURVEY_SHOWN | FAILED
  SURVEY_SHOWN = 'SurveyShown',
  FAILED = 'Failed',
  DONT_SHOW_LINK = 'DontShowLink',
}

/**
 * A link to a survey. The link is rendered asynchronously because we need to first check if
 * canShowSurvey succeeds.
 **/
export class SurveyLink extends HTMLElement {
  readonly #shadow = this.attachShadow({mode: 'open'});
  #trigger = '';
  #promptText = Common.UIString.LocalizedEmptyString;
  #canShowSurvey: (trigger: string, callback: CanShowSurveyCallback) => void = () => {};
  #showSurvey: (trigger: string, callback: ShowSurveyCallback) => void = () => {};
  #state: State = State.CHECKING;

  // Re-setting data will cause the state to go back to 'Checking' which hides the link.
  set data(data: SurveyLinkData) {
    this.#trigger = data.trigger;
    this.#promptText = data.promptText;
    this.#canShowSurvey = data.canShowSurvey;
    this.#showSurvey = data.showSurvey;

    this.#checkSurvey();
  }

  #checkSurvey(): void {
    this.#state = State.CHECKING;
    this.#canShowSurvey(this.#trigger, ({canShowSurvey}) => {
      if (!canShowSurvey) {
        this.#state = State.DONT_SHOW_LINK;
      } else {
        this.#state = State.SHOW_LINK;
      }
      this.#render();
    });
  }

  #sendSurvey(): void {
    this.#state = State.SENDING;
    this.#render();
    this.#showSurvey(this.#trigger, ({surveyShown}) => {
      if (!surveyShown) {
        this.#state = State.FAILED;
      } else {
        this.#state = State.SURVEY_SHOWN;
      }
      this.#render();
    });
  }

  #render(): void {
    if (this.#state === State.CHECKING || this.#state === State.DONT_SHOW_LINK) {
      return;
    }

    let linkText = this.#promptText;
    if (this.#state === State.SENDING) {
      linkText = i18nString(UIStrings.openingSurvey);
    } else if (this.#state === State.SURVEY_SHOWN) {
      linkText = i18nString(UIStrings.thankYouForYourFeedback);
    } else if (this.#state === State.FAILED) {
      linkText = i18nString(UIStrings.anErrorOccurredWithTheSurvey);
    }

    let linkState = '';
    if (this.#state === State.SENDING) {
      linkState = 'pending-link';
    } else if (this.#state === State.FAILED || this.#state === State.SURVEY_SHOWN) {
      linkState = 'disabled-link';
    }

    const ariaDisabled = this.#state !== State.SHOW_LINK;

    // clang-format off
    const output = html`
      <style>${surveyLinkStyles}</style>
      <button
          class="link ${linkState}" tabindex=${ariaDisabled ? '-1' : '0'}
          .disabled=${ariaDisabled} aria-disabled=${ariaDisabled} @click=${this.#sendSurvey}>
        <devtools-icon class="link-icon" name="review" style="color: var(--sys-color-primary); width: var(--issue-link-icon-size, 16px); height: var(--issue-link-icon-size, 16px)">
        </devtools-icon>
        ${linkText}
      </button>`;
    // clang-format on
    render(output, this.#shadow, {host: this});
  }
}

customElements.define('devtools-survey-link', SurveyLink);

declare global {
  interface HTMLElementTagNameMap {
    'devtools-survey-link': SurveyLink;
  }
}