<template>
  <div class="kole-idcard">
    <div class="kole-idcard-field" :class="{ 'is-focus': focused, 'is-valid': valid, 'is-invalid': invalid }">
      <input
        class="kole-idcard-input"
        :value="value"
        maxlength="18"
        :placeholder="placeholder"
        @input="onInput"
        @focus="focused = true"
        @blur="focused = false"
      />
    </div>
    <div v-if="result.birth" class="kole-idcard-info">
      <span>出生日期：<b>{{ result.birth }}</b></span>
      <span>性别：<b>{{ result.gender }}</b></span>
    </div>
    <div class="kole-idcard-tip" :class="tipClass">{{ tipText }}</div>
  </div>
</template>

<script>
var WEIGHTS = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
var CHECK = '10X98765432';
function validate(v) {
  if (!/^\d{17}[\dX]$/.test(v)) return null;
  var sum = 0;
  for (var i = 0; i < 17; i++) sum += parseInt(v[i], 10) * WEIGHTS[i];
  if (CHECK[sum % 11] !== v[17]) return null;
  var birth = v.slice(6, 14);
  return { birth: birth.slice(0, 4) + '-' + birth.slice(4, 6) + '-' + birth.slice(6, 8), gender: parseInt(v[16], 10) % 2 === 1 ? '男' : '女' };
}

export default {
  name: 'KoleIDCardInput',
  props: {
    value: { type: String, default: '' },
    placeholder: { type: String, default: '请输入 18 位身份证号' }
  },
  data() {
    return { focused: false };
  },
  computed: {
    result() {
      return validate(this.value.toUpperCase()) || {};
    },
    valid() {
      return !!this.result.birth;
    },
    invalid() {
      return this.value.length === 18 && !this.result.birth;
    },
    tipClass() {
      if (!this.value) return '';
      return this.valid ? 'valid' : this.invalid ? 'invalid' : '';
    },
    tipText() {
      if (!this.value) return '示例：11010119900307657X';
      if (this.value.length < 18) return '已输入 ' + this.value.length + ' 位，继续…';
      return this.valid ? '校验通过' : '身份证号校验失败，请检查';
    }
  },
  methods: {
    onInput(e) {
      var v = e.target.value.replace(/[^0-9Xx]/g, '').toUpperCase().slice(0, 18);
      e.target.value = v;
      this.$emit('input', v);
    }
  }
};
</script>

<style src="./IDCardInput.css"></style>
