<script>
import $ from 'jquery';
import GfmAutoComplete from 'ee_else_ce/gfm_auto_complete';
import { TYPE_ISSUE } from '~/issues/constants';
import {
  autoCompleteTextMap,
  inputPlaceholderConfidentialTextMap,
  inputPlaceholderTextMap,
} from '../constants';
import IssueToken from './issue_token.vue';

const SPACE_FACTOR = 1;

export default {
  name: 'RelatedIssuableInput',
  components: {
    IssueToken,
  },
  props: {
    inputId: {
      type: String,
      required: false,
      default: '',
    },
    references: {
      type: Array,
      required: false,
      default: () => [],
    },
    pathIdSeparator: {
      type: String,
      required: true,
    },
    inputValue: {
      type: String,
      required: false,
      default: '',
    },
    focusOnMount: {
      type: Boolean,
      required: false,
      default: false,
    },
    autoCompleteSources: {
      type: Object,
      required: false,
      default: () => ({}),
    },
    autoCompleteOptions: {
      type: Object,
      required: false,
      default: () => ({}),
    },
    issuableType: {
      type: String,
      required: false,
      default: TYPE_ISSUE,
    },
    confidential: {
      type: Boolean,
      required: false,
      default: false,
    },
  },
  data() {
    return {
      isInputFocused: false,
      isAutoCompleteOpen: false,
      areEventsAssigned: false,
    };
  },
  computed: {
    inputPlaceholder() {
      const { issuableType, allowAutoComplete, confidential } = this;
      const inputPlaceholderMapping = confidential
        ? inputPlaceholderConfidentialTextMap
        : inputPlaceholderTextMap;
      const allowAutoCompleteText = autoCompleteTextMap[allowAutoComplete][issuableType];
      return `${inputPlaceholderMapping[issuableType]}${allowAutoCompleteText}`;
    },
    allowAutoComplete() {
      return Object.keys(this.autoCompleteSources).length > 0;
    },
  },
  mounted() {
    this.setupAutoComplete();
    if (this.focusOnMount) {
      this.$nextTick()
        .then(() => {
          this.$refs.input.focus();
        })
        .catch(() => {});
    }
  },
  beforeUpdate() {
    this.setupAutoComplete();
  },
  beforeDestroy() {
    const $input = $(this.$refs.input);
    // eslint-disable-next-line @gitlab/no-global-event-off
    $input.off('shown-issues.atwho');
    // eslint-disable-next-line @gitlab/no-global-event-off
    $input.off('hidden-issues.atwho');
    $input.off('inserted-issues.atwho', this.onInput);
  },
  methods: {
    onAutoCompleteToggled(isOpen) {
      this.isAutoCompleteOpen = isOpen;
    },
    onInput() {
      const { value } = this.$refs.input;
      const caretPos = this.$refs.input.selectionStart;
      const rawRefs = value.split(/\s/);
      let touchedReference;
      let position = 0;

      const untouchedRawRefs = rawRefs
        .filter((ref) => {
          let isTouched = false;

          if (caretPos >= position && caretPos <= position + ref.length) {
            touchedReference = ref;
            isTouched = true;
          }

          position = position + ref.length + SPACE_FACTOR;

          return !isTouched;
        })
        .filter((ref) => ref.trim().length > 0);

      this.$emit('addIssuableFormInput', {
        newValue: value,
        untouchedRawReferences: untouchedRawRefs,
        touchedReference,
        caretPos,
      });
    },
    onBlur(event) {
      // Early exit if this Blur event is caused by card header
      const container = this.$root.$el.querySelector('.js-button-container');
      if (container && container.contains(event.relatedTarget)) {
        return;
      }

      this.isInputFocused = false;

      // Avoid tokenizing partial input when clicking an autocomplete item
      if (!this.isAutoCompleteOpen) {
        const { value } = this.$refs.input;
        // Avoid event emission when only pathIdSeparator has been typed
        if (value !== this.pathIdSeparator) {
          this.$emit('addIssuableFormBlur', value);
        }
      }
    },
    onFocus() {
      this.isInputFocused = true;
    },
    setupAutoComplete() {
      const $input = $(this.$refs.input);

      if (this.allowAutoComplete) {
        this.gfmAutoComplete = new GfmAutoComplete(this.autoCompleteSources);
        this.gfmAutoComplete.setup($input, this.autoCompleteOptions);
      }

      if (!this.areEventsAssigned) {
        $input.on('shown-issues.atwho', this.onAutoCompleteToggled.bind(this, true));
        $input.on('hidden-issues.atwho', this.onAutoCompleteToggled.bind(this, true));
      }
      this.areEventsAssigned = true;
    },
    onIssuableFormWrapperClick() {
      this.$refs.input.focus();
    },
  },
};
</script>

<template>
  <div
    ref="issuableFormWrapper"
    :class="{ focus: isInputFocused }"
    class="add-issuable-form-input-wrapper form-control gl-field-error-outline gl-h-auto gl-px-3 gl-pt-2 gl-pb-0"
    role="button"
    @click="onIssuableFormWrapperClick"
  >
    <ul
      class="gl-display-flex gl-flex-wrap gl-align-items-baseline gl-list-style-none gl-m-0 gl-p-0"
    >
      <li
        v-for="(reference, index) in references"
        :key="reference"
        class="gl-max-w-full gl-mb-2 gl-mr-2"
      >
        <issue-token
          :id-key="index"
          :display-reference="reference.text || reference"
          can-remove
          is-condensed
          :path-id-separator="pathIdSeparator"
          event-namespace="pendingIssuable"
          @pendingIssuableRemoveRequest="
            (params) => {
              $emit('pendingIssuableRemoveRequest', params);
            }
          "
        />
      </li>
      <li class="gl-mb-2 gl-flex-grow-1">
        <input
          :id="inputId"
          ref="input"
          :value="inputValue"
          :placeholder="inputPlaceholder"
          :aria-label="inputPlaceholder"
          type="text"
          class="gl-w-full gl-border-none gl-outline-0"
          data-qa-selector="add_issue_field"
          autocomplete="off"
          @input="onInput"
          @focus="onFocus"
          @blur="onBlur"
          @keyup.escape.exact="$emit('addIssuableFormCancel')"
        />
      </li>
    </ul>
  </div>
</template>
