<!--
  Matomo - free/libre analytics platform
  @link https://matomo.org
  @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
-->

<template>
  <div ref="root">
    <label class="fieldRadioTitle" v-show="title">{{ title }}</label>
    <p
      v-for="(checkboxModel, $index) in availableOptions"
      :key="$index"
      class="checkbox"
    >
      <label>
        <input
          :value="checkboxModel.key"
          :checked="!!checkboxStates[$index]"
          @change="onChange($index)"
          v-bind="uiControlAttributes"
          type="checkbox"
          :id="`${name}${checkboxModel.key}`"
          :name="checkboxModel.name"
        />
        <span>{{ checkboxModel.value }}</span>

        <span class="form-description" v-show="checkboxModel.description">
          {{ checkboxModel.description }}
        </span>
      </label>
    </p>
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
import AbortableModifiers from './AbortableModifiers';

interface Option {
  key: unknown;
}

function getCheckboxStates(availableOptions?: Option[], modelValue?: unknown[]) {
  return (availableOptions || []).map((o) => modelValue && modelValue.indexOf(o.key) !== -1);
}

export default defineComponent({
  props: {
    modelValue: Array,
    modelModifiers: Object,
    name: String,
    title: String,
    availableOptions: Array,
    uiControlAttributes: Object,
    type: String,
  },
  inheritAttrs: false,
  emits: ['update:modelValue'],
  computed: {
    checkboxStates() {
      return getCheckboxStates(this.availableOptions as Option[], this.modelValue);
    },
  },
  mounted() {
    window.Materialize.updateTextFields();
  },
  methods: {
    onChange(changedIndex: number) {
      const checkboxStates = [...this.checkboxStates];
      checkboxStates[changedIndex] = !checkboxStates[changedIndex];

      const availableOptions = (this.availableOptions || {}) as Record<string, Option>;

      const newValue: unknown[] = [];
      Object.values(availableOptions).forEach((option: Option, index: number) => {
        if (checkboxStates[index]) {
          newValue.push(option.key);
        }
      });

      if (!(this.modelModifiers as AbortableModifiers)?.abortable) {
        this.$emit('update:modelValue', newValue);
        return;
      }

      const emitEventData = {
        value: newValue,
        abort: () => {
          // undo checked changes since we want the parent component to decide if it should go
          // through
          const item = (this.$refs.root as HTMLElement).querySelectorAll('input').item(changedIndex);
          item.checked = !item.checked;
        },
      };

      this.$emit('update:modelValue', emitEventData);
    },
  },
});
</script>
