<template>
  <img v-lazy="currentSrc" :alt="alt" v-if="currentLazy" class="lazy-img" @error="onError">
  <img :src="currentSrc" :alt="alt" v-else lazy="" data-src="" @error="onError">
</template>

<script>
import {mapState} from 'vuex';

export default {
  name: 'ImageFormat',
  props: {
    lazy: {
      type: Boolean,
      default: true
    },
    src: String,
    width: [Number, String],
    height: [Number, String],
    mode: {
      type: [Number, String],
      default: 2
    },
    alt: String,
    interlace: Boolean
  },
  data() {
    return {
      refresh: false,
      currentLazy: this.lazy
    };
  },
  watch: {
    src() {
      this.currentLazy = false;
    },
    lazy(val) {
      this.currentLazy = val;
    }
  },
  computed: {
    ...mapState(['yoho']),
    currentSrc() {
      let src = this.src;
      let splits = (this.src || '').split('?');
      const imgName = splits[0] || '';
      let query = splits[1] || '';

      if (/imageView/.test(query)) {
        if (!/interlace/.test(query)) {
          src = `${src}/interlace/1`;
        }
        if (!/webp/.test(query) && this.yoho.window.supportWebp) {
          src = `${src}/format/webp`;
        } else if (!/format/.test(query) && /\.png$/i.test(imgName)) {
          src = `${src}/format/jpg`;
        }
      }
      return (src || '')
        .replace('http://', '//')
        .replace('{mode}', this.mode)
        .replace('{width}', this.width)
        .replace('{height}', this.height);
    }
  },
  methods: {
    onError() {
      this.$emit('error');
    }
  }
};
</script>