<template>
  <div class="kole-upload">
    <div class="kole-upload-drop" :class="{ 'is-over': over }" @click="file.click()" @dragover.prevent="over = true" @dragleave="over = false" @drop.prevent="onDrop">
      <span class="kole-upload-icon">⬆️</span>
      <div class="kole-upload-hint">将文件拖到此处，或 <b>点击选择</b></div>
    </div>
    <input ref="file" type="file" multiple style="display:none" @change="onChange" />
    <div class="kole-upload-list">
      <div v-for="it in files" :key="it.id" class="kole-upload-item">
        <div class="kole-upload-thumb"><img v-if="it.thumb" :src="it.thumb" /><span v-else>文件</span></div>
        <div class="kole-upload-meta">
          <div class="kole-upload-name">{{ it.name }}</div>
          <div class="kole-upload-bar"><i :style="{ width: it.progress + '%' }"></i></div>
        </div>
        <div class="kole-upload-status">{{ it.done ? '已完成' : Math.round(it.progress) + '%' }}</div>
        <button class="kole-upload-del" @click="remove(it.id)">×</button>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref } from 'vue';

const files = ref([]);
const over = ref(false);
const file = ref(null);

function addFiles(flist) {
  Array.prototype.forEach.call(flist, (f) => {
    const id = 'f' + Date.now() + Math.random().toString(36).slice(2, 6);
    const item = { id, name: f.name, progress: 0, done: false, thumb: '' };
    if (/^image\//.test(f.type) && f.size < 2 * 1024 * 1024) {
      const reader = new FileReader();
      reader.onload = (e) => (item.thumb = e.target.result);
      reader.readAsDataURL(f);
    }
    files.value.push(item);
    simulate(item);
  });
}
function onChange(e) { addFiles(e.target.files); e.target.value = ''; }
function onDrop(e) { over.value = false; addFiles(e.dataTransfer.files); }
function simulate(item) {
  const t = setInterval(() => {
    item.progress = Math.min(100, item.progress + Math.random() * 22);
    if (item.progress >= 100) { item.progress = 100; item.done = true; clearInterval(t); }
  }, 220);
}
function remove(id) { files.value = files.value.filter((x) => x.id !== id); }
</script>

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