<template>
  <div 
    class="component-upload-image" 
    @mouseenter="handleMouseEnter"
    @mouseleave="handleMouseLeave"
  >
    <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"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{hide: this.fileList.length >= this.limit}"
      class="image-upload"
      :style="cssVars"
      drag
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="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
      <br/>
      支持
      <b style="color: #f56c6c">拖动上传</b>
      和鼠标移入后
      <b style="color: #f56c6c">Ctrl+V</b>
      粘贴上传
    </div>

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

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

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"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    width: {
      type: String,
      default: "148px"
    },
    height: {
      type: String,
      default: "148px"
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      isListening: false // 新增：标记是否正在监听粘贴事件
    };
  },
  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: this.getRealUrl(item), url: this.getRealUrl(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);
    },
    cssVars() {
      return {
        '--width': this.width,
        '--height': this.height
      }
    }
  },
  methods: {
    getRealUrl(url) {
      if (url.startsWith('http')) {
        return url;
      }
      return this.baseUrl + url;
    },
    // 新增：鼠标进入处理
    handleMouseEnter() {
      if (!this.isListening) {
        document.addEventListener('paste', this.handlePaste);
        this.isListening = true;
      }
    },
    // 新增：鼠标离开处理
    handleMouseLeave() {
      if (this.isListening) {
        document.removeEventListener('paste', this.handlePaste);
        this.isListening = false;
      }
    },
    // 粘贴图片上传
    handlePaste(event) {
      // 阻止默认行为
      event.preventDefault();
      
      const items = event.clipboardData?.items;
      
      if (!items) {
        this.$modal.msgError('当前浏览器不支持粘贴上传');
        return;
      }

      let file = null;
      for (let i = 0; i < items.length; i++) {
        if (items[i].type.indexOf('image') !== -1) {
          file = items[i].getAsFile();
          break;
        }
      }

      if (!file) {
        this.$modal.msgError('粘贴内容中不包含图片');
        return;
      }

      // 检查是否超出数量限制
      if (this.fileList.length >= this.limit) {
        this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
        return;
      }

      // 使用 handleBeforeUpload 进行文件验证
      const valid = this.handleBeforeUpload(file);
      if (valid !== false) {
        // 手动上传文件
        const formData = new FormData();
        formData.append('file', file);
        
        // 发起上传请求
        axios.post(this.uploadImgUrl, formData, {
          headers: {
            ...this.headers,
            'Content-Type': 'multipart/form-data'
          }
        }).then(res => {
          this.handleUploadSuccess(res.data, file);
        }).catch(() => {
          this.handleUploadError();
        });
      }
    },
    // 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 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.fileName, url: res.fileName });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      if (file.url.match(/(docx?|xlsx?|pptx?|pdf)$/i)) {
        // TODO 查看office文件
        window.open(`https://view.officeapps.live.com/op/view.aspx?src=${encodeURIComponent(this.getRealUrl(file.url))}`, '_blank');
      } else{ 
        this.dialogImageUrl = file.url;
        this.dialogVisible = true;
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url.replace(this.baseUrl, "") + separator;
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>
<style scoped lang="scss">
/* 上传区域基础样式 */
::v-deep .el-upload {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 上传按钮样式 */
::v-deep .el-upload--picture-card {
  width: var(--width);
  height: var(--height);
}

/* 隐藏上传按钮 */
::v-deep.hide .el-upload--picture-card {
  display: none;
}

/* 已上传图片项样式 */
::v-deep .el-upload-list__item {
  width: var(--width);
  height: var(--height);
}

::v-deep .el-upload-dragger {
  width: var(--width);
  height: var(--height);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 图片操作按钮容器 */
::v-deep .el-upload-list__item-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: center;
  padding: 0 10%;

  .el-upload-list__item-preview {
    flex: 1;
    text-align: center;
  }

  .el-upload-list__item-delete {
    flex: 1;
    margin-left: 0;
    text-align: center;
  }
}

/* 移除列表动画效果 */
::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);
}
</style>

