import { wantsNewWindow } from 'discourse/lib/intercept-click';
import { longDateNoYear } from 'discourse/lib/formatter';
import computed from 'ember-addons/ember-computed-decorators';
import Sharing from 'discourse/lib/sharing';

export default Ember.Component.extend({
  elementId: 'share-link',
  classNameBindings: ['visible'],
  link: null,
  visible: null,

  @computed
  sources() {
    return Sharing.activeSources(this.siteSettings.share_links);
  },

  @computed('type', 'postNumber')
  shareTitle(type, postNumber) {
    if (type === 'topic') { return I18n.t('share.topic'); }
    if (postNumber) {
      return I18n.t('share.post', { postNumber });
    }
    return I18n.t('share.topic');
  },

  @computed('date')
  displayDate(date) {
    return longDateNoYear(new Date(date));
  },

  _focusUrl() {
    const link = this.get('link');
    if (!this.capabilities.touch) {
      const $linkInput = $('#share-link input');
      $linkInput.val(link);

      // Wait for the fade-in transition to finish before selecting the link:
      window.setTimeout(() => $linkInput.select().focus(), 160);
    } else {
      const $linkForTouch = $('#share-link .share-for-touch a');
      $linkForTouch.attr('href', link);
      $linkForTouch.text(link);
      const range = window.document.createRange();
      range.selectNode($linkForTouch[0]);
      window.getSelection().addRange(range);
    }
  },

  _showUrl($target, url) {
    const $currentTargetOffset = $target.offset();
    const $this = this.$();

    if (Ember.isEmpty(url)) { return; }

    // Relative urls
    if (url.indexOf("/") === 0) {
      url = window.location.protocol + "//" + window.location.host + url;
    }

    const shareLinkWidth = $this.width();
    let x = $currentTargetOffset.left - (shareLinkWidth / 2);
    if (x < 25) { x = 25; }
    if (x + shareLinkWidth > $(window).width()) {
      x -= shareLinkWidth / 2;
    }

    const header = $('.d-header');
    let y = $currentTargetOffset.top - ($this.height() + 20);
    if (y < header.offset().top + header.height()) {
      y = $currentTargetOffset.top + 10;
    }

    $this.css({top: "" + y + "px"});

    if (!this.site.mobileView) {
      $this.css({left: "" + x + "px"});
    }
    this.set('link', url);
    this.set('visible', true);

    Ember.run.scheduleOnce('afterRender', this, this._focusUrl);
  },

  _webShare(url) {
    // We can pass title and text too, but most share targets do their own oneboxing
    navigator.share({
      url: url
    })
    .catch((error) => console.warn('Error sharing', error));
  },

  didInsertElement() {
    this._super();

    const $html = $('html');
    $html.on('mousedown.outside-share-link', e => {
      // Use mousedown instead of click so this event is handled before routing occurs when a
      // link is clicked (which is a click event) while the share dialog is showing.
      if (this.$().has(e.target).length !== 0) { return; }
      this.send('close');
      return true;
    });

    $html.on('click.discourse-share-link', 'button[data-share-url], .post-info .post-date[data-share-url]', e => {
      // if they want to open in a new tab, let it so
      if (wantsNewWindow(e)) { return true; }

      e.preventDefault();

      const $currentTarget = $(e.currentTarget);
      const url = $currentTarget.data('share-url');
      const postNumber = $currentTarget.data('post-number');
      const postId = $currentTarget.closest('article').data('post-id');
      const date = $currentTarget.children().data('time');

      this.setProperties({ postNumber, date, postId });

      // use native webshare only when the user clicks on the "chain" icon
      // navigator.share needs HTTPS, returns undefined on HTTP
      if (navigator.share && !$currentTarget.hasClass('post-date')) {
        this._webShare(url);
      } else {
        this._showUrl($currentTarget, url);
      }

      return false;
    });

    $html.on('keydown.share-view', e => {
      if (e.keyCode === 27) {
        this.send('close');
      }
    });

    this.appEvents.on('share:url', (url, $target) => this._showUrl($target, url));
  },

  willDestroyElement() {
    this._super();
    $('html').off('click.discourse-share-link')
             .off('mousedown.outside-share-link')
             .off('keydown.share-view');
  },

  actions: {
    replyAsNewTopic() {
      const postStream = this.get("topic.postStream");
      const postId = this.get("postId") || postStream.findPostIdForPostNumber(1);
      const post = postStream.findLoadedPost(postId);
      this.sendAction('replyAsNewTopic', post);
      this.send("close");
    },

    close() {
      this.setProperties({
        link: null,
        postNumber: null,
        postId: null,
        visible: false
      });
    },

    share(source) {
      const url = source.generateUrl(this.get('link'), this.get('topic.title'));
      if (source.shouldOpenInPopup) {
        window.open(url, '', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,width=600,height=' + (source.popupHeight || 315));
      } else {
        window.open(url, '_blank');
      }
    }
  }

});