import { $$ } from '../../utils/Dom';
import { l } from '../../strings/Strings';
import { SVGIcons } from '../../utils/SVGIcons';
import { uniqueId } from 'underscore';

const ROOT_CLASSNAME = 'coveo-user-feedback-banner';
const CONTAINER_CLASSNAME = `${ROOT_CLASSNAME}-container`;
const LABEL_CLASSNAME = `${ROOT_CLASSNAME}-label`;
const BUTTONS_CONTAINER_CLASSNAME = `${ROOT_CLASSNAME}-buttons`;
const YES_BUTTON_CLASSNAME = `${ROOT_CLASSNAME}-yes-button`;
const NO_BUTTON_CLASSNAME = `${ROOT_CLASSNAME}-no-button`;
const BUTTON_ACTIVE_CLASSNAME = `${ROOT_CLASSNAME}-button-active`;
const THANK_YOU_BANNER_CLASSNAME = `${ROOT_CLASSNAME}-thanks`;
const THANK_YOU_BANNER_ACTIVE_CLASSNAME = `${THANK_YOU_BANNER_CLASSNAME}-active`;
const ICON_CLASSNAME = `${THANK_YOU_BANNER_CLASSNAME}-icon`;
const EXPLAIN_WHY_CLASSNAME = `${ROOT_CLASSNAME}-explain-why`;
const EXPLAIN_WHY_ACTIVE_CLASSNAME = `${EXPLAIN_WHY_CLASSNAME}-active`;

enum UsefulState {
  Unknown,
  Yes,
  No
}

interface IButtonOptions {
  text: string;
  className: string;
  action: Function;
  icon?: {
    content: string;
    className: string;
  };
  attributes?: any;
}

export const UserFeedbackBannerClassNames = {
  ROOT_CLASSNAME,
  CONTAINER_CLASSNAME,
  LABEL_CLASSNAME,
  BUTTONS_CONTAINER_CLASSNAME,
  YES_BUTTON_CLASSNAME,
  NO_BUTTON_CLASSNAME,
  BUTTON_ACTIVE_CLASSNAME,
  THANK_YOU_BANNER_CLASSNAME,
  THANK_YOU_BANNER_ACTIVE_CLASSNAME,
  ICON_CLASSNAME,
  EXPLAIN_WHY_CLASSNAME,
  EXPLAIN_WHY_ACTIVE_CLASSNAME
};

export class UserFeedbackBanner {
  public explainWhy: HTMLElement;
  private isUseful = UsefulState.Unknown;
  private yesButton: HTMLElement;
  private noButton: HTMLElement;
  private thankYouBanner: HTMLElement;
  private labelId: string;

  constructor(private readonly sendUsefulnessAnalytics: (isUseful: boolean) => void, private readonly onExplainWhyPressed: () => void) {
    this.labelId = uniqueId(LABEL_CLASSNAME);
  }

  public build() {
    return $$(
      'div',
      {
        className: ROOT_CLASSNAME,
        ariaLive: 'polite'
      },
      this.buildContainer(),
      this.buildThankYouBanner()
    ).el;
  }

  public reset() {
    this.isUseful = UsefulState.Unknown;
    $$(this.yesButton).removeClass(BUTTON_ACTIVE_CLASSNAME);
    $$(this.yesButton).setAttribute('aria-pressed', 'false');
    $$(this.noButton).removeClass(BUTTON_ACTIVE_CLASSNAME);
    $$(this.noButton).setAttribute('aria-pressed', 'false');
    $$(this.thankYouBanner).removeClass(THANK_YOU_BANNER_ACTIVE_CLASSNAME);
    $$(this.explainWhy).removeClass(EXPLAIN_WHY_ACTIVE_CLASSNAME);
  }

  private buildContainer() {
    return $$(
      'div',
      {
        className: CONTAINER_CLASSNAME,
        ariaLabelledby: this.labelId
      },
      this.buildLabel(),
      this.buildButtons()
    ).el;
  }

  private buildLabel() {
    return $$('span', { className: LABEL_CLASSNAME, id: this.labelId }, l('UsefulnessFeedbackRequest')).el;
  }

  private buildThankYouBanner() {
    this.thankYouBanner = $$('div', { className: THANK_YOU_BANNER_CLASSNAME }).el;

    const text = $$('span', {}, l('UsefulnessFeedbackThankYou')).el;
    this.thankYouBanner.appendChild(text);

    this.explainWhy = this.buildButton({
      text: l('UsefulnessFeedbackExplainWhy'),
      className: EXPLAIN_WHY_CLASSNAME,
      action: () => this.requestExplaination()
    });
    this.thankYouBanner.appendChild(this.explainWhy);

    return this.thankYouBanner;
  }

  private buildButtons() {
    const buttonsContainer = $$('div', { className: BUTTONS_CONTAINER_CLASSNAME }).el;

    this.yesButton = this.buildButton({
      text: l('Yes'),
      className: YES_BUTTON_CLASSNAME,
      action: () => this.showThankYouBanner(true),
      icon: {
        className: ICON_CLASSNAME,
        content: SVGIcons.icons.checkYes
      },
      attributes: {
        ariaPressed: false,
        ariaDescribedby: this.labelId
      }
    });
    this.yesButton.setAttribute('aria-pressed', 'false');
    buttonsContainer.appendChild(this.yesButton);

    this.noButton = this.buildButton({
      text: l('No'),
      className: NO_BUTTON_CLASSNAME,
      action: () => this.showThankYouBanner(false),
      icon: {
        className: ICON_CLASSNAME,
        content: SVGIcons.icons.clearSmall
      },
      attributes: {
        ariaPressed: false,
        ariaDescribedby: this.labelId
      }
    });
    buttonsContainer.appendChild(this.noButton);

    return buttonsContainer;
  }

  private buildButton(options: IButtonOptions) {
    const button = $$('button', { ...(options.attributes || {}), className: options.className, type: 'button' }).el;

    if (options.icon) {
      const icon = $$('span', { className: options.icon.className }, options.icon.content).el;
      button.appendChild(icon);
      const text = $$('span', {}, options.text).el;
      button.appendChild(text);
    } else {
      button.innerText = options.text;
    }

    button.addEventListener('click', () => options.action());

    return button;
  }

  private showThankYouBanner(isUseful: boolean) {
    if (this.isUseful !== UsefulState.Unknown && isUseful === (this.isUseful === UsefulState.Yes)) {
      return;
    }
    this.isUseful = isUseful ? UsefulState.Yes : UsefulState.No;
    $$(this.yesButton).toggleClass(BUTTON_ACTIVE_CLASSNAME, isUseful);
    $$(this.yesButton).setAttribute('aria-pressed', `${isUseful}`);
    $$(this.noButton).toggleClass(BUTTON_ACTIVE_CLASSNAME, !isUseful);
    $$(this.noButton).setAttribute('aria-pressed', `${!isUseful}`);
    $$(this.thankYouBanner).addClass(THANK_YOU_BANNER_ACTIVE_CLASSNAME);
    $$(this.explainWhy).toggleClass(EXPLAIN_WHY_ACTIVE_CLASSNAME, !isUseful);
    this.sendUsefulnessAnalytics(isUseful);
  }

  private requestExplaination() {
    this.onExplainWhyPressed();
  }
}