<script>

/**
 * Renders each stage of the pipeline mini graph.
 *
 * Given the provided endpoint will make a request to
 * fetch the dropdown data when the stage is clicked.
 *
 * Request is made inside this component to make it reusable between:
 * 1. Pipelines main table
 * 2. Pipelines table in commit and Merge request views
 * 3. Merge request widget
 * 4. Commit widget
 */

/* global Flash */
import { borderlessStatusIconEntityMap } from '../../vue_shared/ci_status_icons';
import loadingIcon from '../../vue_shared/components/loading_icon.vue';
import tooltipMixin from '../../vue_shared/mixins/tooltip';

export default {
  props: {
    stage: {
      type: Object,
      required: true,
    },

    updateDropdown: {
      type: Boolean,
      required: false,
      default: false,
    },
  },

  mixins: [
    tooltipMixin,
  ],

  data() {
    return {
      isLoading: false,
      dropdownContent: '',
      endpoint: this.stage.dropdown_path,
    };
  },

  components: {
    loadingIcon,
  },

  updated() {
    if (this.dropdownContent.length > 0) {
      this.stopDropdownClickPropagation();
    }
  },

  watch: {
    updateDropdown() {
      if (this.updateDropdown &&
        this.isDropdownOpen() &&
        !this.isLoading) {
        this.fetchJobs();
      }
    },
  },

  methods: {
    onClickStage() {
      if (!this.isDropdownOpen()) {
        this.isLoading = true;
        this.fetchJobs();
      }
    },

    fetchJobs() {
      this.$http.get(this.endpoint)
        .then((response) => {
          this.dropdownContent = response.json().html;
          this.isLoading = false;
        })
        .catch(() => {
          this.closeDropdown();
          this.isLoading = false;

          const flash = new Flash('Something went wrong on our end.');
          return flash;
        });
    },

    /**
     * When the user right clicks or cmd/ctrl + click in the job name
     * the dropdown should not be closed and the link should open in another tab,
     * so we stop propagation of the click event inside the dropdown.
     *
     * Since this component is rendered multiple times per page we need to guarantee we only
     * target the click event of this component.
     */
    stopDropdownClickPropagation() {
      $(this.$el.querySelectorAll('.js-builds-dropdown-list a.mini-pipeline-graph-dropdown-item'))
        .on('click', (e) => {
          e.stopPropagation();
        });
    },

    closeDropdown() {
      if (this.isDropdownOpen()) {
        $(this.$refs.dropdown).dropdown('toggle');
      }
    },

    isDropdownOpen() {
      return this.$el.classList.contains('open');
    },
  },

  computed: {
    dropdownClass() {
      return this.dropdownContent.length > 0 ? 'js-builds-dropdown-container' : 'js-builds-dropdown-loading';
    },

    triggerButtonClass() {
      return `ci-status-icon-${this.stage.status.group}`;
    },

    svgIcon() {
      return borderlessStatusIconEntityMap[this.stage.status.icon];
    },
  },
};
</script>

<template>
  <div class="dropdown">
    <button
      ref="tooltip"
      :class="triggerButtonClass"
      @click="onClickStage"
      class="mini-pipeline-graph-dropdown-toggle js-builds-dropdown-button"
      :title="stage.title"
      data-placement="top"
      data-toggle="dropdown"
      type="button"
      id="stageDropdown"
      aria-haspopup="true"
      aria-expanded="false">

      <span
        v-html="svgIcon"
        aria-hidden="true"
        :aria-label="stage.title">
      </span>

      <i
        class="fa fa-caret-down"
        aria-hidden="true">
      </i>
    </button>

    <ul
      class="dropdown-menu mini-pipeline-graph-dropdown-menu js-builds-dropdown-container"
      aria-labelledby="stageDropdown">

      <li
        :class="dropdownClass"
        class="js-builds-dropdown-list scrollable-menu">

        <loading-icon v-if="isLoading"/>

        <ul
          v-else
          v-html="dropdownContent">
        </ul>
      </li>
    </ul>
  </div>
</script>
