<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :before-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :accept="accept.join()"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script setup>
import { getToken } from '@/utils/auth';

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ['jpg', 'png', 'jpeg', 'svg', 'gif'],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  //是否返回文件名name
  isBackName: {
    type: Boolean,
    default: false,
  },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref('');
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_ENV == 'development' ? '/dev-api' : import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + '/file/upload'); // 上传的图片服务器地址
const headers = ref({ Authorization: 'Bearer ' + getToken() });
const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

watch(
  () => props.modelValue,
  val => {
    if (val) {
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(',');
      // 然后将数组转为对象数组
      fileList.value = list.map(item => {
        if (typeof item === 'string') {
          item = { name: item, url: item };
        }
        return item;
      });
      console.log(fileList.value);
    } else {
      fileList.value = [];
      return [];
    }
  },
  { deep: true, immediate: true }
);

const accept = computed(() => {
  if (props.fileType.length) {
    let data = [];
    data = props.fileType.map(val => {
      return `.${val}`;
    });
    return data;
  } else {
    return [];
  }
});

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = '';
    if (file.name.lastIndexOf('.') > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf('image') > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading('正在上传图片，请稍候...');
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    uploadList.value.push({ name: res.data.originalName, url: res.data.url });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  console.log(file);
  const findex = fileList.value.map(f => f.url).indexOf(file.url);
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1);
    if (props.isBackName) {
      emit('update:modelValue', fileList.value);
    } else {
      emit('update:modelValue', listToString(fileList.value));
    }

    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    if (props.isBackName) {
      emit('update:modelValue', fileList.value);
    } else {
      emit('update:modelValue', listToString(fileList.value));
    }
    proxy.$modal.closeLoading();
  }
}
// 上传失败
function handleUploadError() {
  proxy.$modal.msgError('上传图片失败');
  proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = '';
  separator = separator || ',';
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf('blob:') !== 0) {
      strs += list[i].url.replace(baseUrl, '') + separator;
    }
  }
  return strs != '' ? strs.substr(0, strs.length - 1) : '';
}
</script>

<style lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
.component-upload-image {
  .el-upload--picture-card {
    width: 100px;
    height: 100px;
  }
}
</style>