<!--
 * @Description: 
 * @Autor: renchao
 * @LastEditTime: 2023-07-20 10:22:20
-->
<template>
  <label class="el-checkbox" :class="[
    border && checkboxSize ? 'el-checkbox--' + checkboxSize : '',
    { 'is-disabled': isDisabled },
    { 'is-bordered': border },
    { 'is-checked': isChecked }
  ]" :id="id">
    <span class="el-checkbox__input" :class="{
      'is-disabled': isDisabled,
      'is-checked': isChecked,
      'is-indeterminate': indeterminate,
      'is-focus': focus
    }" :tabindex="indeterminate ? 0 : false" :role="indeterminate ? 'checkbox' : false"
      :aria-checked="indeterminate ? 'mixed' : false">
      <span class="el-checkbox__inner"></span>
      <input v-if="trueLabel || falseLabel" class="el-checkbox__original" type="checkbox"
        :aria-hidden="indeterminate ? 'true' : 'false'" :name="name" :disabled="isDisabled" :true-value="trueLabel"
        :false-value="falseLabel" v-model="model" @change="handleChange" @focus="focus = true" @blur="focus = false">
      <input v-else class="el-checkbox__original" type="checkbox" :aria-hidden="indeterminate ? 'true' : 'false'"
        :disabled="isDisabled" :value="label" :name="name" v-model="model" @change="handleChange" @focus="focus = true"
        @blur="focus = false">
    </span>
    <span class="el-checkbox__label">
      <slot></slot>
    </span>
  </label>
</template>
<script>
  import Emitter from 'element-ui/src/mixins/emitter';

  export default {
    name: 'ElCheckbox',

    mixins: [Emitter],

    inject: {
      elForm: {
        default: ''
      },
      elFormItem: {
        default: ''
      }
    },

    componentName: 'ElCheckbox',

    data () {
      return {
        selfModel: false,
        focus: false,
        isLimitExceeded: false
      };
    },

    computed: {
      model: {
        /**
         * @description: get
         * @author: renchao
         */
        get () {
          return this.isGroup
            ? this.store : this.value !== undefined
              ? this.value : this.selfModel;
        },
        /**
         * @description: set
         * @param {*} val
         * @author: renchao
         */
        set (val) {
          if (this.isGroup) {
            this.isLimitExceeded = false;
            (this._checkboxGroup.min !== undefined &&
              val.length < this._checkboxGroup.min &&
              (this.isLimitExceeded = true));

            (this._checkboxGroup.max !== undefined &&
              val.length > this._checkboxGroup.max &&
              (this.isLimitExceeded = true));

            this.isLimitExceeded === false &&
              this.dispatch('ElCheckboxGroup', 'input', [val]);
          } else {
            this.$emit('input', val);
            this.selfModel = val;
          }
        }
      },

      /**
       * @description: isChecked
       * @author: renchao
       */
      isChecked () {
        if ({}.toString.call(this.model) === '[object Boolean]') {
          return this.model;
        } else if (Array.isArray(this.model)) {
          return this.model.indexOf(this.label) > -1;
        } else if (this.model !== null && this.model !== undefined) {
          return this.model === this.trueLabel;
        }
      },
      /**
       * @description: isGroup
       * @author: renchao
       */
      isGroup () {
        let parent = this.$parent;
        while (parent) {
          if (parent.$options.componentName !== 'ElCheckboxGroup') {
            parent = parent.$parent;
          } else {
            this._checkboxGroup = parent;
            return true;
          }
        }
        return false;
      },
      /**
       * @description: store
       * @author: renchao
       */
      store () {
        return this._checkboxGroup ? this._checkboxGroup.value : this.value;
      },

      /**
       * @description: isLimitDisabled
       * @author: renchao
       */
      isLimitDisabled () {
        const { max, min } = this._checkboxGroup;
        return !!(max || min) &&
          (this.model.length >= max && !this.isChecked) ||
          (this.model.length <= min && this.isChecked);
      },
      /**
       * @description: isDisabled
       * @author: renchao
       */
      isDisabled () {
        return this.isGroup
          ? this._checkboxGroup.disabled || this.disabled || (this.elForm || {}).disabled || this.isLimitDisabled
          : this.disabled || (this.elForm || {}).disabled;
      },
      /**
       * @description: _elFormItemSize
       * @author: renchao
       */
      _elFormItemSize () {
        return (this.elFormItem || {}).elFormItemSize;
      },
      /**
       * @description: checkboxSize
       * @author: renchao
       */
      checkboxSize () {
        const temCheckboxSize = this.size || this._elFormItemSize || (this.$ELEMENT || {}).size;
        return this.isGroup
          ? this._checkboxGroup.checkboxGroupSize || temCheckboxSize
          : temCheckboxSize;
      }
    },

    props: {
      value: {},
      label: {},
      indeterminate: Boolean,
      disabled: Boolean,
      checked: Boolean,
      name: String,
      trueLabel: [String, Number],
      falseLabel: [String, Number],
      id: String, /* 当indeterminate为真时，为controls提供相关连的checkbox的id，表明元素间的控制关系*/
      controls: String, /* 当indeterminate为真时，为controls提供相关连的checkbox的id，表明元素间的控制关系*/
      border: Boolean,
      size: String
    },

    methods: {
      /**
       * @description: addToStore
       * @author: renchao
       */
      addToStore () {
        if (
          Array.isArray(this.model) &&
          this.model.indexOf(this.label) === -1
        ) {
          this.model.push(this.label);
        } else {
          this.model = this.trueLabel || true;
        }
      },
      /**
       * @description: handleChange
       * @author: renchao
       */
      handleChange (ev) {
        if (this.isLimitExceeded) return;
        let value;
        if (ev.target.checked) {
          value = this.trueLabel === undefined ? true : this.trueLabel;
        } else {
          value = this.falseLabel === undefined ? false : this.falseLabel;
        }
        this.$emit('change', value, ev);
        this.$nextTick(() => {
          if (this.isGroup) {
            this.dispatch('ElCheckboxGroup', 'change', [this._checkboxGroup.value]);
          }
        });
      }
    },
    /**
     * @description: created
     * @author: renchao
     */
    created () {
      this.checked && this.addToStore();
    },
    /**
     * @description: mounted
     * @author: renchao
     */
    mounted () { // 为indeterminate元素 添加aria-controls 属性
      if (this.indeterminate) {
        this.$el.setAttribute('aria-controls', this.controls);
      }
    },
    /**
     * @description: watch
     * @author: renchao
     */
    watch: {
      value (value) {
        this.dispatch('ElFormItem', 'el.form.change', value);
      }
    }
  };
</script>