<template>
  <SvgIcon :size="size" :name="getSvgIcon" v-if="isSvgIcon" :class="[$attrs.class]" />
  <span
    v-else
    ref="elRef"
    :class="[$attrs.class, 'app-iconify anticon']"
    :style="getWrapStyle"
  ></span>
</template>
<script lang="ts">
  import type { PropType } from 'vue';
  import {
    defineComponent,
    ref,
    watch,
    onMounted,
    nextTick,
    unref,
    computed,
    CSSProperties,
  } from 'vue';

  import SvgIcon from './SvgIcon.vue';
  import Iconify from '@purge-icons/generated';
  import { isString } from '/@/utils/is';
  import { propTypes } from '/@/utils/propTypes';

  const SVG_END_WITH_FLAG = '|svg';
  export default defineComponent({
    name: 'GIcon',
    components: { SvgIcon },
    props: {
      // icon name
      icon: propTypes.string,
      // icon color
      color: propTypes.string,
      // icon size
      size: {
        type: [String, Number] as PropType<string | number>,
        default: 16,
      },
      prefix: propTypes.string.def(''),
    },
    setup(props) {
      const elRef = ref<ElRef>(null);

      const isSvgIcon = computed(() => props.icon?.endsWith(SVG_END_WITH_FLAG));
      const getSvgIcon = computed(() => props.icon.replace(SVG_END_WITH_FLAG, ''));
      const getIconRef = computed(() => `${props.prefix ? props.prefix + ':' : ''}${props.icon}`);

      const update = async () => {
        if (unref(isSvgIcon)) return;

        const el = unref(elRef);
        if (!el) return;

        await nextTick();
        const icon = unref(getIconRef);
        if (!icon) return;

        const svg = Iconify.renderSVG(icon, {});
        if (svg) {
          el.textContent = '';
          el.appendChild(svg);
        } else {
          const span = document.createElement('span');
          span.className = 'iconify';
          span.dataset.icon = icon;
          el.textContent = '';
          el.appendChild(span);
        }
      };

      const getWrapStyle = computed(
        (): CSSProperties => {
          const { size, color } = props;
          let fs = size;
          if (isString(size)) {
            fs = parseInt(size, 10);
          }
          return {
            fontSize: `${fs}px`,
            color,
            display: 'inline-flex',
          };
        }
      );

      watch(() => props.icon, update, { flush: 'post' });

      onMounted(update);

      return { elRef, getWrapStyle, isSvgIcon, getSvgIcon };
    },
  });
</script>
<style lang="less">
  .app-iconify {
    display: inline-block;
    vertical-align: middle;
  }

  span.iconify {
    display: block;
    min-width: 1em;
    min-height: 1em;
    background: @iconify-bg-color;
    border-radius: 100%;
  }
</style>
