<template>
  <div class="component-upload-image">
    <ul class="el-upload-list el-upload-list--picture-card">
      <li tabindex="0" class="el-upload-list__item is-success" v-for="(item, index) in fileList" :key="index">
        <video v-if="item.url.substr(-4) == '.mp4'" :src="item.url"></video>
        <img v-else :src="item.url" :alt="item.name" class="el-upload-list__item-thumbnail" />
        <!-- <a class="el-upload-list__item-name">
          <i class="el-icon-document"></i>
        </a> -->
        <label class="el-upload-list__item-status-label">
          <i class="el-icon-upload-success el-icon-check"></i>
        </label>
        <!-- <i class="el-icon-close"></i>
        <i class="el-icon-close-tip">按 delete 键可删除</i> -->
        <span class="el-upload-list__item-actions">
          <span class="el-upload-list__item-preview" @click="handlePictureCardPreview(item)">
            <i class="el-icon-zoom-in"></i>
          </span>
          <span class="el-upload-list__item-delete" @click="handleRemove(item)" v-if="isShowEditButton">
            <i class="el-icon-delete"></i>
          </span>
        </span>
      </li>
    </ul>

    <el-upload v-if="isShowEditButton" multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed" name="file" :on-remove="handleRemove" :show-file-list="false" :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview" :class="{ hide: this.fileList.length >= this.limit }">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      {{ $t("请上传") }}
      <template v-if="fileSize">
        {{ $t("大小不超过") }} <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        {{ $t("格式为") }} <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      {{ $t("的文件") }}
    </div>

    <el-dialog :visible.sync="dialogVisible" :title="$t('预览')" width="800" append-to-body>
      <template v-if="dialogImageUrl">
        <video v-if="dialogImageUrl.substr(-4) == '.mp4'" :src="dialogImageUrl" controls autoplay style="display: block; max-width: 100%; margin: 0 auto"></video>
        <img v-else :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
      </template>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth"

export default {
  props: {
    value: [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", "mp4"]
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    //是否显示编辑按钮
    isShowEditButton: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/app-api/file/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken()
      },
      fileList: []
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",")
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                item = { name: item, url: item }
              } else {
                item = { name: item, url: item }
              }
            }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        this.$emit("input", this.listToString(this.fileList))
      }
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      console.log({ res })
      this.uploadList.push({ name: res.data.split("/").pop(), url: res.data })
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        this.$emit("input", this.listToString(this.fileList))
        this.$modal.closeLoading()
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ""
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1)
        }
        isImg = this.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) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`)
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.$modal.loading("正在上传图片，请稍候...")
      this.number++
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试")
      this.$modal.closeLoading()
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
      // window.open(file.url)
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ""
      separator = separator || ","
      for (let i in list) {
        strs += list[i].url.replace(this.baseUrl, "") + separator
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : ""
    }
  }
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}

.component-upload-image {
  display: flex;
  flex-wrap: wrap;
}
</style>