<template>
  <div class="d-inline-flex pe-1">
    <v-tooltip bottom>
      <template #activator="{ on, attrs }">
        <v-btn
          :id="`LikeLink${commentId}`"
          :loading="changingLike"
          :class="likeTextColorClass"
          class="px-0 width-auto"
          text
          link
          x-small
          v-bind="attrs"
          v-on="on"
          @click="changeLike">
          {{ $t('UIActivity.msg.LikeActivity') }}
        </v-btn>
      </template>
      <span>
        {{ likeButtonTitle }}
      </span>
    </v-tooltip>
    <v-tooltip bottom>
      <template #activator="{ on, attrs }">
        <v-btn
          v-show="likesCount"
          :id="`LikersListLink${commentId}`"
          class="primary--text font-weight-bold"
          x-small
          icon
          v-bind="attrs"
          v-on="on"
          @click="openLikesList">
          ({{ likesCount }})
        </v-btn>
      </template>
      <span v-sanitized-html="likersFullnameTitle"></span>
    </v-tooltip>
  </div>
</template>

<script>
export default {
  props: {
    activity: {
      type: Object,
      default: null,
    },
    comment: {
      type: Object,
      default: null,
    },
  },
  data: () => ({
    changingLike: false,
  }),
  computed: {
    commentId() {
      return this.comment && this.comment.id;
    },
    commentPoster() {
      return this.comment && this.comment.poster;
    },
    activityId() {
      return this.activity && this.activity.id;
    },
    likers() {
      return this.comment && this.comment.likes && this.comment.likes.slice().reverse() || [];
    },
    likesCount() {
      return this.likers.length;
    },
    likersFullnameTitle() {
      const likersFullname = this.likers.map(liker => liker && liker.fullname).filter(liker => !!liker);
      if (this.likesCount > 10) {
        const likersFullnameTitle = likersFullname.slice(0, 9).join('<br />');
        return `${likersFullnameTitle}<br />${this.$t('UIActivity.msg.MoreLikers', {0: (this.likesCount - 9)})}`;
      } else {
        return likersFullname.slice(0, 10).join('<br />');
      }
    },
    hasLiked() {
      return this.likers.filter(like => like && like.id === eXo.env.portal.userIdentityId).length;
    },
    likeColorClass() {
      return this.hasLiked && 'primary--text' || 'disabled--text';
    },
    likeTextColorClass() {
      return this.hasLiked && 'primary--text' || '';
    },
    likeButtonTitle() {
      return this.hasLiked && this.$t('UIActivity.msg.UnlikeActivity') || this.$t('UIActivity.msg.LikeActivity');
    },
  },
  created() {
    this.$root.$on('activity-comment-liked', this.updateCommentLikers);
  },
  beforeDestroy() {
    this.$root.$off('activity-comment-liked', this.updateCommentLikers);
  },
  methods: {
    updateCommentLikers(comment) {
      if (comment && comment.id === this.comment.id) {
        this.comment.likes = comment.likes || [];
      }
    },
    changeLike() {
      if (this.changingLike) {
        return;
      }
      if (this.hasLiked) {
        return this.unlikeComment();
      } else {
        return this.likeComment();
      }
    },
    likeComment() {
      this.changingLike = true;
      return this.$activityService.likeActivity(this.commentId)
        .then(() => {
          const liker = Object.assign({}, this.$currentUserIdentity, this.$currentUserIdentity.profile);
          this.comment.likes = [...this.likers, liker];
          this.comment.likesCount++;
          this.$root.$emit('activity-comment-liked', this.comment);
          this.$root.$emit('activity-liked', this.commentId);
        })
        .finally(() => this.changingLike = false);
    },
    unlikeComment() {
      this.changingLike = true;
      return this.$activityService.unlikeActivity(this.commentId)
        .then(() => {
          this.comment.likes = this.likers.filter(likeIdentity => likeIdentity.id !== eXo.env.portal.userIdentityId);
          this.comment.likesCount--;
          this.$root.$emit('activity-comment-liked', this.comment);
          this.$root.$emit('activity-liked', this.commentId);
        })
        .finally(() => this.changingLike = false);
    },
    openLikesList() {
      document.dispatchEvent(new CustomEvent('open-reaction-drawer-selected-tab', {detail: {
        activityId: this.commentId,
        activityPosterId: this.commentPoster,
        tab: 'like',
        activityType: 'COMMENT'
      }}));
    }
  },
};
</script>