<template>
  <div
    v-if="isExternal"
    :style="styleExternalIcon"
    class="el-svg-external-icon el-svg-icon"
    v-on="$listeners"
  />
  <svg
    v-else
    :class="svgClass"
    aria-hidden="true"
    v-on="$listeners"
  >
    <use :xlink:href="iconName" />
  </svg>
</template>

<script>
// doc: https://panjiachen.github.io/vue-element-admin-site/feature/component/svg-icon.html#usage
function isExternal(path) {
  return /^(https?:|mailto:|tel:)/.test(path)
}

export default {
  name: 'BmlSvgIcon',
  props: {
    iconClass: {
      type: String,
      required: true
    },
    className: {
      type: String,
      default: ''
    }
  },
  computed: {
    isExternal() {
      return isExternal(this.iconClass)
    },
    iconName() {
      return `#icon-${this.iconClass}`
    },
    svgClass() {
      if (this.className) {
        return `el-svg-icon ${this.className}`
      }
      return 'el-svg-icon'
    },
    styleExternalIcon() {
      return {
        mask: `url(${this.iconClass}) no-repeat 50% 50%`,
        '-webkit-mask': `url(${this.iconClass}) no-repeat 50% 50%`
      }
    }
  }
}
</script>
