<template>
  <div class="component-upload-image">
    <el-upload multiple :action="videoUpload" list-type="picture-card" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
      name="file" :drag="true" :data="data" :disabled="isDisabled" :on-remove="handleRemove" :show-file-list="true"
      :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview" :style="style"
      :class="{ hide: fileList.length >= limit || isDisabled }">
      <el-icon class="avatar-uploader-icon">
        +
      </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>
      <template v-if="isImage(dialogImageUrl)">
        <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
      </template>
      <template v-else-if="isVideo(dialogImageUrl)">
        <video :src="dialogImageUrl" controls autoplay
          style="display: block; max-width: 100%; height: 500px; margin: 0 auto"></video>
      </template>
    </el-dialog>
  </div>
</template>

<script setup>
import { ref, reactive, watch, computed } from "vue";
import { useLoginStore } from "~/store";
import { imageUpload } from "~/service/common";
import { videoUpload } from "~/service/common";

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: () => ['png', 'jpg', 'jpeg'],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  // 是否禁用
  isDisabled: {
    type: Boolean,
    default: false,
  },
  // 上传携带的参数
  data: {
    type: Object,
  },
})

const store = useLoginStore();
const headers = {
  Accept: "application/json",
  ...store.headers,
};

const emit = defineEmits()
const number = ref(0)
const uploadList = ref([])
const dialogImageUrl = ref('')
const dialogVisible = ref(false)
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') {
          // if (item.indexOf(baseUrl) === -1) {
          //   item = { name: baseUrl + item, url: baseUrl + item }
          // } else {
          item = { name: item, url: item }
          // }
        }
        return item
      })
    } else {
      fileList.value = []
      return []
    }
    updateVideoDom()

  },
  { deep: true, immediate: true },
)

// 删除图片
function handleRemove(file, files) {
  emit('update:modelValue', listToString(fileList.value))
}

// 上传成功回调
function handleUploadSuccess(res) {
  if (res.code != 0) {
    ElMessage.error(`上传失败，原因:${res.msg}!`);
    fileList.value = fileList.value.slice(0, fileList.value.length - 1)
    return
  }
  uploadList.value.push({ name: res.data.fileName, url: res.data.url })
  if (uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value)
    uploadList.value = []
    number.value = 0
    emit('update:modelValue', listToString(fileList.value))
  }
  updateVideoDom()

}

function updateVideoDom() {
  setTimeout(() => {
    Array.prototype.slice.call(document.getElementsByClassName('is-success'))
      .filter(item => item.className.indexOf('el-upload-list__item') !== -1)
      .map(item => {
        let tag = item.getElementsByClassName('el-upload-list__item-thumbnail')[0];
        if (isVideo(tag.getAttribute('src'))) {
          let attr = [tag.getAttribute('class'), tag.getAttribute('src')];
          let videoTag = document.createElement('video');
          videoTag.setAttribute('class', attr[0]);
          videoTag.setAttribute('src', attr[1]);
          item.replaceChild(videoTag, tag);
        }
      });
  },)
}

// 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) {
    ElMessage.error(`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) {
      ElMessage.error(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false
    }
  }
  number.value++
}

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

// 上传失败
function handleUploadError() {
  ElMessage.error('上传图片失败')
}

// 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 + separator
    }
  }
  return strs != '' ? strs.substr(0, strs.length - 1) : ''
}

const getFileExtension = (filename) => {
  return filename.slice(filename.lastIndexOf('.'));
};

const isImage = (value) => {
  const imageExtensions = ['.png', '.jpg', '.jpeg'];
  const extension = getFileExtension(value);
  return imageExtensions.includes(extension.toLowerCase());
};

const isVideo = (value) => {
  const videoExtensions = ['.mp4', '.avi', '.mov', '.wmv', '.flv', '.mkv', '.mpeg', '.3gp', '.webm', '.vob', '.rm', '.rmvb'];
  const extension = getFileExtension(value);
  return videoExtensions.includes(extension.toLowerCase());
};


</script>

<style lang="less" scoped>
:deep(.hide .el-upload--picture-card) {
  display: none !important;
}

:deep(.el-upload-dragger) {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
</style>