<template>
  <div v-if="!disabled" class="upload-file">
    <el-upload
      ref="uploadRef"
      v-model:file-list="fileList"
      :action="uploadUrl"
      :auto-upload="autoUpload"
      :before-upload="beforeUpload"
      :disabled="disabled"
      :drag="drag"
      :http-request="httpRequest"
      :limit="props.limit"
      :multiple="props.limit > 1"
      :on-error="excelUploadError"
      :on-exceed="handleExceed"
      :on-preview="handlePreview"
      :on-remove="handleRemove"
      :on-success="handleFileSuccess"
      :show-file-list="true"
      class="upload-file-uploader"
      name="file"
    >
      <el-button type="primary">
        <Icon icon="ep:upload-filled" />
        选取文件
      </el-button>
      <template v-if="isShowTip" #tip>
        <div style="font-size: 8px">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </div>
        <div style="font-size: 8px">
          格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b> 的文件
        </div>
      </template>
      <template #file="row">
        <div class="flex items-center">
          <!-- <span>{{ row.file.name }}</span> -->
          <el-tooltip :content="row.file.name" placement="top">
  <span class="ellipsis-text">{{ row.file.name }}</span>
</el-tooltip>
          <div class="ml-10px">
            <el-link
              :href="row.file.url"
              :underline="false"
              download
              target="_blank"
              type="primary"
            >
              下载
            </el-link>
          </div>
          <div class="ml-10px">
            <el-button link type="danger" @click="handleRemove(row.file)"> 删除</el-button>
          </div>
        </div>
      </template>
    </el-upload>
  </div>

  <!-- 上传操作禁用时 -->
  <div v-if="disabled" class="upload-file">
    <div v-for="(file, index) in fileList" :key="index" class="flex items-center file-list-item">
  <span>{{ file.name}}</span>
      <div class="ml-10px">
        <el-link :href="file.url" :underline="false" download target="_blank" type="primary">
          下载
        </el-link>
      </div>
    </div>
  </div>
</template>
<script lang="ts" setup>
import { propTypes } from '@/utils/propTypes'
import type { UploadInstance, UploadProps, UploadRawFile, UploadUserFile } from 'element-plus'
import { isString } from '@/utils/is'
import { useUpload } from '@/components/UploadFile/src/useUpload'
import { UploadFile } from 'element-plus/es/components/upload/src/upload'

defineOptions({ name: 'UploadFile' })

const message = useMessage() // 消息弹窗
const emit = defineEmits(['update:modelValue'])

const props = defineProps({
  modelValue: propTypes.oneOfType<string | string[]>([String, Array<String>]).isRequired,
  fileType: propTypes.array.def(['png', 'jpg', 'jpeg', 'doc', 'xls', 'ppt', 'txt', 'pdf']), // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileSize: propTypes.number.def(100), // 大小限制(MB)
  limit: propTypes.number.def(5), // 数量限制
  autoUpload: propTypes.bool.def(true), // 自动上传
  drag: propTypes.bool.def(false), // 拖拽上传
  isShowTip: propTypes.bool.def(true), // 是否显示提示
  disabled: propTypes.bool.def(false) // 是否禁用上传组件 ==> 非必传（默认为 false）
})

// ========== 上传相关 ==========
const uploadRef = ref<UploadInstance>()
const uploadList = ref<UploadUserFile[]>([])
const fileList = ref<UploadUserFile[]>([])
const uploadNumber = ref<number>(0)
const nameMap = ref<Record<string, string>>({})

const { uploadUrl, httpRequest } = useUpload()

// 文件上传之前判断
const beforeUpload: UploadProps['beforeUpload'] = (file: UploadRawFile) => {
  if (fileList.value.length >= props.limit) {
    message.error(`上传文件数量不能超过${props.limit}个!`)
    return false
  }
  let fileExtension = ''
  if (file.name.lastIndexOf('.') > -1) {
    fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
  }
  const isImg = props.fileType.some((type: string) => {
    if (file.type.indexOf(type) > -1) return true
    return !!(fileExtension && fileExtension.indexOf(type) > -1)
  })
  const isLimit = file.size < props.fileSize * 1024 * 1024
  if (!isImg) {
    message.error(`文件格式不正确, 请上传${props.fileType.join('/')}格式!`)
    return false
  }
  if (!isLimit) {
    message.error(`上传文件大小不能超过${props.fileSize}MB!`)
    return false
  }
  message.success('正在上传文件，请稍候...')
  uploadNumber.value++
}
// 处理上传的文件发生变化
// const handleFileChange = (uploadFile: UploadFile): void => {
//   uploadRef.value.data.path = uploadFile.name
// }
const getUrlFromRes = (res: any): string => {
  if (!res) return ''
  if (typeof res === 'string') return res
  if (typeof res.data === 'string') return res.data
  const data = res.data || res
  if (typeof data === 'string') return data
  if (data.fileUrl) return data.fileUrl
  return ''
}

const getNameFromRes = (res: any, url: string): string => {
  const data = res && res.data ? res.data : res
  if (data && typeof data === 'object' && data.fileName) return data.fileName
  if (!url) return ''
  const idx = url.lastIndexOf('/')
  return idx !== -1 ? url.substring(idx + 1) : url
}

const handleFileSuccess: UploadProps['onSuccess'] = (res: any, uploadFile): void => {
  const url = getUrlFromRes(res)
  if (!url) {
    message.error('上传返回数据异常')
    return
  }
  const name = getNameFromRes(res, url)
  if (url && name) {
    nameMap.value[url] = name
  }
  message.success('上传成功')
  const index = fileList.value.findIndex((item) => item.uid === uploadFile.uid)
  if (index > -1) {
    fileList.value.splice(index, 1)
  }
  uploadList.value.push({ name, url })
  if (uploadList.value.length === uploadNumber.value) {
    fileList.value.push(...uploadList.value)
    uploadList.value = []
    uploadNumber.value = 0
    emitUpdateModelValue()
  }
}
// 文件数超出提示
const handleExceed: UploadProps['onExceed'] = (): void => {
  message.error(`上传文件数量不能超过${props.limit}个!`)
}
// 上传错误提示
const excelUploadError: UploadProps['onError'] = (): void => {
  message.error('导入数据失败，请您重新上传！')
}
// 删除上传文件
const handleRemove = (file: UploadFile) => {
  const index = fileList.value.map((f) => f.name).indexOf(file.name)
  if (index > -1) {
    const removed = fileList.value.splice(index, 1)[0]
    if (removed && removed.url && nameMap.value[removed.url]) {
      delete nameMap.value[removed.url]
    }
    emitUpdateModelValue()
  }
}
const handlePreview: UploadProps['onPreview'] = (uploadFile) => {
  console.log(uploadFile)
}

const getDisplayNameByUrl = (url: string): string => {
  const cached = nameMap.value[url]
  if (cached) return cached
  const idx = url.lastIndexOf('/')
  return idx !== -1 ? url.substring(idx + 1) : url
}

const parseModelValueToInfos = (val: string | string[]): { fileName: string; fileUrl: string }[] => {
  const result: { fileName: string; fileUrl: string }[] = []

  const addFromUrl = (url: string) => {
    const trimmed = url.trim()
    if (!trimmed) return
    const idx = trimmed.lastIndexOf('/')
    const name = idx !== -1 ? trimmed.substring(idx + 1) : trimmed
    result.push({ fileName: name, fileUrl: trimmed })
  }

  const handleString = (text: string) => {
    const trimmed = text.trim()
    if (!trimmed) return
    if (trimmed.startsWith('{') || trimmed.startsWith('[')) {
      try {
        const parsed = JSON.parse(trimmed)
        if (Array.isArray(parsed)) {
          parsed.forEach((item) => {
            if (item && typeof item === 'object' && item.fileUrl) {
              const u = String(item.fileUrl)
              const n = item.fileName ? String(item.fileName) : undefined
              const idx = u.lastIndexOf('/')
              const name = n || (idx !== -1 ? u.substring(idx + 1) : u)
              result.push({ fileName: name, fileUrl: u })
            }
          })
          return
        }
        if (parsed && typeof parsed === 'object' && parsed.fileUrl) {
          const u = String(parsed.fileUrl)
          const n = parsed.fileName ? String(parsed.fileName) : undefined
          const idx = u.lastIndexOf('/')
          const name = n || (idx !== -1 ? u.substring(idx + 1) : u)
          result.push({ fileName: name, fileUrl: u })
          return
        }
      } catch {}
    }
    trimmed
      .split(',')
      .map((s) => s.trim())
      .filter((s) => !!s)
      .forEach((u) => addFromUrl(u))
  }

  const handleAny = (v: any) => {
    if (!v) return
    if (typeof v === 'string') {
      handleString(v)
      return
    }
    if (Array.isArray(v)) {
      v.forEach((item) => handleAny(item))
      return
    }
    if (typeof v === 'object' && v.fileUrl) {
      const u = String(v.fileUrl)
      const n = v.fileName ? String(v.fileName) : undefined
      const idx = u.lastIndexOf('/')
      const name = n || (idx !== -1 ? u.substring(idx + 1) : u)
      result.push({ fileName: name, fileUrl: u })
    }
  }

  handleAny(val as any)
  return result
}

const buildInfosFromFileList = (): { fileName: string; fileUrl: string }[] => {
  const infos: { fileName: string; fileUrl: string }[] = []
  fileList.value.forEach((file) => {
    if (!file.url) return
    const url = file.url as string
    const cached = nameMap.value[url]
    let name = cached || file.name || ''
    if (!name) {
      const idx = url.lastIndexOf('/')
      name = idx !== -1 ? url.substring(idx + 1) : url
    }
    infos.push({ fileName: String(name), fileUrl: url })
  })
  return infos
}

// 监听模型绑定值变动
watch(
  () => props.modelValue,
  (val: string | string[]) => {
    if (!val) {
      fileList.value = [] // fix：处理掉缓存，表单重置后上传组件的内容并没有重置
      return
    }

    fileList.value = []
    nameMap.value = {}
    const infos = parseModelValueToInfos(val)
    if (!infos.length) return
    fileList.value.push(
      ...infos.map((item) => {
        nameMap.value[item.fileUrl] = item.fileName
        return { name: item.fileName, url: item.fileUrl }
      })
    )
  },
  { immediate: true, deep: true }
)
// 发送文件链接列表更新
const emitUpdateModelValue = () => {
  const infos = buildInfosFromFileList()
  let result: string | string[]
  if (props.limit === 1 || isString(props.modelValue)) {
    if (!infos.length) {
      result = ''
    } else {
      result = JSON.stringify(infos[0])
    }
  } else {
    result = JSON.stringify(infos)
  }
  emit('update:modelValue', result)
}
</script>
<style lang="scss" scoped>
.upload-file-uploader {
  margin-bottom: 5px;
}

:deep(.upload-file-list .el-upload-list__item) {
  position: relative;
  margin-bottom: 10px;
  line-height: 2;
  border: 1px solid #e4e7ed;
}

:deep(.el-upload-list__item-file-name) {
  max-width: 250px;
}

:deep(.upload-file-list .ele-upload-list__item-content) {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

:deep(.ele-upload-list__item-content-action .el-link) {
  margin-right: 10px;
}

.file-list-item {
  border: 1px dashed var(--el-border-color-darker);
  border-radius: 8px;
}

.ellipsis-text {
  display: inline-block;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
</style>
