import { Component } from '../Base/Component';
import { ComponentOptions } from '../Base/ComponentOptions';
import { IComponentBindings } from '../Base/ComponentBindings';
import {
  SearchAlertsEvents,
  ISearchAlertsEventArgs,
  ISearchAlertsFailEventArgs,
  ISearchAlertsPopulateMessageEventArgs
} from '../../events/SearchAlertEvents';
import { QueryEvents } from '../../events/QueryEvents';
import { SUBSCRIPTION_TYPE, ISubscriptionQueryRequest } from '../../rest/Subscription';
import { PopupUtils, PopupHorizontalAlignment, PopupVerticalAlignment } from '../../utils/PopupUtils';
import { l } from '../../strings/Strings';
import { $$, Dom } from '../../utils/Dom';
import * as _ from 'underscore';
import { ISearchAlertsPopulateMessageText } from '../../events/SearchAlertEvents';
import { SVGIcons } from '../../utils/SVGIcons';
import { SVGDom } from '../../utils/SVGDom';

export interface ISearchAlertMessageOptions {
  closeDelay: number;
}

/**
 * The SearchAlertsMessage component allows the {@link SearchAlerts} component to display messages.
 *
 * You should not include this component in your page. Instead, use a {@link SearchAlerts} component, and access the
 * {@link SearchAlerts.message} attribute.
 */
export class SearchAlertsMessage extends Component {
  static ID = 'SubscriptionsMessages';

  /**
   * The options for the SearchAlertsMessage component
   * @componentOptions
   */
  static options: ISearchAlertMessageOptions = {
    /**
     * Specifies how long to display the search alerts messages (in milliseconds).
     *
     * Default value is `2000`. Minimum value is `0`.
     */
    closeDelay: ComponentOptions.buildNumberOption({ defaultValue: 2000, min: 0 })
  };

  private message: Dom;
  private closeTimeout: number;

  /**
   * Creates a new SearchAlertsMessage component
   * @param element The HTMLElement on which to instantiate the component.
   * @param options The options for the SearchAlertsMessage component.
   * @param bindings The bindings that the component requires to function normally. If not set, these will be
   * automatically resolved (with a slower execution time).
   */
  constructor(public element: HTMLElement, public options: ISearchAlertMessageOptions, public bindings?: IComponentBindings) {
    super(element, SearchAlertsMessage.ID, bindings);

    this.bind.onRootElement(SearchAlertsEvents.searchAlertsCreated, (args: ISearchAlertsEventArgs) => this.handleSubscriptionCreated(args));
    this.bind.oneRootElement(SearchAlertsEvents.searchAlertsFail, (args: ISearchAlertsEventArgs) => this.handleSearchAlertsFail(args));
    this.bind.oneRootElement(SearchAlertsEvents.searchAlertsDeleted, () => this.close());
    this.bind.oneRootElement(QueryEvents.newQuery, () => this.close());
  }

  public getCssClass(): string {
    return 'coveo-subscriptions-messages';
  }

  public getFollowQueryMessage(query?: string, htmlFormatted = false): string {
    let populateMessageArguments: ISearchAlertsPopulateMessageEventArgs = {
      text: []
    };

    let getAdditionalTextFormatted = () => {
      return _.map(populateMessageArguments.text, text => {
        text = this.formatMessageArgumentsText(text);
        return `${htmlFormatted ? '<li>' : '('}${text}${htmlFormatted ? '</li>' : ')'}`;
      }).join(' ');
    };

    $$(this.root).trigger(SearchAlertsEvents.searchAlertsPopulateMessage, populateMessageArguments);
    let additionalMessage = `${htmlFormatted ? '<ul>' : ''}${getAdditionalTextFormatted()}${htmlFormatted ? '</ul>' : ''}`;

    let automaticallyBuiltMessage: string;

    if (query && populateMessageArguments.text.length != 0) {
      automaticallyBuiltMessage = `${_.escape(query)} ${additionalMessage}`;
    }

    if (query && populateMessageArguments.text.length == 0) {
      automaticallyBuiltMessage = `${_.escape(query)}`;
    }

    if (!query && populateMessageArguments.text.length != 0) {
      automaticallyBuiltMessage = `${additionalMessage}`;
    }

    if (!query && populateMessageArguments.text.length == 0) {
      automaticallyBuiltMessage = htmlFormatted ? l('EmptyQuery') : _.unescape(l('EmptyQuery'));
    }

    return automaticallyBuiltMessage;
  }

  /**
   * Displays a message near the passed dom attribute.
   * @param dom Specifies where to display the message.
   * @param message The message.
   * @param error Specifies whether the message is an error message.
   */
  public showMessage(dom: Dom, message: string, error: boolean) {
    this.message = $$('div', {
      className: 'coveo-subscriptions-messages'
    });
    this.message.el.innerHTML = `
      <div class='coveo-subscriptions-messages-message'>
        <div class='coveo-subscriptions-messages-content'><span>${message}</span></div>
        <div class='coveo-subscriptions-messages-info-close'>${SVGIcons.icons.checkboxHookExclusionMore}</div>
      </div>`;

    this.message.toggleClass('coveo-subscriptions-messages-error', error);
    let closeButton = this.message.find('.coveo-subscriptions-messages-info-close');
    SVGDom.addClassToSVGInContainer(closeButton, 'coveo-subscript-messages-info-close-svg');
    $$(closeButton).on('click', () => this.close());

    PopupUtils.positionPopup(
      this.message.el,
      dom.el,
      this.root,
      {
        horizontal: PopupHorizontalAlignment.INNERLEFT,
        vertical: PopupVerticalAlignment.BOTTOM,
        verticalOffset: 12,
        horizontalClip: true
      },
      this.root
    );

    this.startCloseDelay();

    this.message.on('mouseleave', () => {
      this.startCloseDelay();
    });
    this.message.on('mouseenter', () => {
      this.stopCloseDelay();
    });
  }

  private formatMessageArgumentsText(text: string | ISearchAlertsPopulateMessageText) {
    if (_.isString(text)) {
      text = _.escape(text);
    } else if (text.lineThrough) {
      text = '<span style="text-decoration:line-through">' + _.escape(text.value) + '</span>';
    } else {
      text = _.escape(text.value);
    }
    return text;
  }

  private handleSubscriptionCreated(args: ISearchAlertsEventArgs) {
    this.close();
    if (args.dom != null) {
      if (args.subscription.type == SUBSCRIPTION_TYPE.followQuery) {
        let typeConfig = <ISubscriptionQueryRequest>args.subscription.typeConfig;
        this.showMessage($$(args.dom), l('SubscriptionsMessageFollowQuery', this.getFollowQueryMessage(typeConfig.query.q, true)), false);
      } else {
        this.showMessage($$(args.dom), l('SubscriptionsMessageFollow'), false);
      }
    }
  }

  private handleSearchAlertsFail(args: ISearchAlertsFailEventArgs) {
    this.close();
    if (args.dom != null) {
      this.showMessage($$(args.dom), l('SearchAlerts_Fail'), true);
    }
  }

  private startCloseDelay() {
    clearTimeout(this.closeTimeout);
    this.closeTimeout = window.setTimeout(() => {
      this.close();
    }, this.options.closeDelay);
  }

  private stopCloseDelay() {
    clearTimeout(this.closeTimeout);
  }

  private close() {
    if (this.message != null) {
      clearTimeout(this.closeTimeout);
      this.message.remove();
      this.message = null;
    }
  }
}