<template>
  <div>
    <el-upload
      ref="upload"
      :class="disabled ? 'disabled' : ''"
      list-type="picture-card"
      :action="action"
      :file-list="newFileList"
      :disabled="disabled"
      :on-remove="handleRemove"
      :on-success="handleSuccess"
      :before-upload="beforeUpload"
    >
      <i slot="default" class="el-icon-plus"></i>
      <div slot="file" slot-scope="{ file }">
        <img class="el-upload-list__item-thumbnail" :src="file.url" alt="" />
        <span class="el-upload-list__item-actions">
          <span
            class="el-upload-list__item-preview"
            @click="handlePictureCardPreview(file)"
          >
            <i class="el-icon-zoom-in"></i>
          </span>
          <span
            v-if="!disabled"
            class="el-upload-list__item-delete"
            @click="handleRemove(file)"
          >
            <i class="el-icon-delete"></i>
          </span>
        </span>
      </div>
      <div slot="tip" class="el-upload__tip" v-if="!disabled">
        可以上傳jpg/png/Jpeg格式圖片或正確格式視頻文件,上傳文件大小不能超過 60MB!
      </div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible" append-to-body width="80%">
      <div style="width:100%;text-align:center">
        <img v-if="isShowImg" ref="dialogImg" :style="{width:'100%', 'aspect-ratio':dialogRatio }" :src="dialogUrl" />
        <video v-else width="100%" height="600px" :src="dialogUrl" controls="controls" autoplay></video>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import util from "@/libs/util";
export default {
  props: {
    fileList: {
      type: Array,
      default: () => {
        return [];
      },
    },
    disabled: {
      type: Boolean,
      default: () => {
        return false;
      },
    },
  },
  data() {
    return {
      newFileList:[],
      action: util.baseUrl + "/sdfs/file/uploadImage",
      dialogVisible: false,
      isShowImg: false,
      dialogUrl: "",
      dialogRatio:1,
    };
  },
  watch: {
    fileList: {
      handler(newV) {
        let newFileList = [];
        const videoType = ["mp4", "ogg", "flv", "avi", "wmv", "3gp", "mov"];
        newFileList = this.fileList.map(item => {
          let url = item.url ? item.url : item;
          const type = url.split(".")[url.split(".").length - 1];
          let file = {
            url: url
          }
          if (videoType.includes(type)) {
            file.videoUrl = file.url;
            this.getVideoBase64(url).then(res => {
              file.url = res;
            })
          }
          return file;
        })
        this.newFileList = newFileList;
      },
      immediate: true
    },
    dialogVisible(newV) {
      if(!newV) {
        this.isShowImg = true;
        this.dialogUrl = "";
      }
    }
  },
  methods: {
    handleRemove(file, fileList) {
      console.log(file)
      for (let i in this.newFileList) {
        if (file.uid == this.newFileList[i].uid) {
          this.newFileList.splice(i, 1);
        }
      }
      this.$emit("setFileList", this.newFileList);
    },
    handleSuccess(res, file) {
      let _self = this;
      if (res.code !== '00000') {
          _self.$message({
              message: '附件上傳失敗',
              type: 'error'
          })
          _self.fileList.splice(_self.fileList.indexOf(file, 1))
      } else {
        let data = {
          name: file.name,
          url: file.response.data,
        }
        const type = data.url.split(".")[data.url.split(".").length - 1];
        const videoType = ["mp4", "ogg", "flv", "avi", "wmv", "3gp", "mov"];
        if (videoType.includes(type)) {
            //視頻附件，獲取第一幀畫面作為 封面展示
            data.videoUrl = file.response.data;
            this.getVideoBase64(data.url).then(res => {
              data.url = res;
            })
        }

        this.fileList.push(data);
        this.$emit("setFileList", this.fileList);
      }
    },
    beforeUpload(file) {
      const isJPG =
        file.type === "image/jpeg" ||
        file.type === "image/jpg" ||
        file.type === "image/png";
      const isVideo =
        [
          "video/mp4",
          "video/ogg",
          "video/flv",
          "video/avi",
          "video/wmv",
          "video/3gp",
          "video/mov",
        ].indexOf(file.type) !== -1;
      if (!isJPG && !isVideo) {
        this.$message.error(
          "請確認上傳圖片為jpg/png/jpeg/格式，視頻為正確格式!"
        );
        return false;
      }
      const isLt60M = file.size / 1024 / 1024 < 60;
      if (!isLt60M) {
        this.$message.error('上傳文件大小不能超過 60MB!');
        return false
      }
      return (isJPG || isVideo) && isLt60M;
    },
    handlePictureCardPreview(file) {
      if (file.videoUrl) {
        this.dialogUrl = file.videoUrl;
        this.isShowImg = false;
      }else {
        this.dialogUrl = file.url;
        this.isShowImg = true;
        
        setTimeout(() => {
          this.getImageSize(this.$refs.dialogImg).then(res => {
            this.dialogRatio = res;
          })
        })
      }
      this.dialogVisible = true;
    },
    //獲取圖片比例
    getImageSizeByUrl(url) {
        return new Promise(function (resolve, reject) {
            let image = new Image();
            image.onload = function () {
                resolve(image.width/image.height);
            };
            image.onerror = function () {
                reject(new Error('error'));
            };
            image.src = url;
        });
    },
    async getImageSize(img) {
        if (img.naturalWidth) {
            // 適用于Firefox/IE9/Safari/Chrome/Opera瀏覽器
            return img.naturalWidth/img.naturalHeight
        } else {
            return await this.getImageSizeByUrl(img.src);
        }
    },
    /**
     * @description 獲取視頻第一幀作為回顯封面
     * @param {*} url 
     * @return {*}
     */
    getVideoBase64(url) {
        return new Promise(function (resolve, reject) {
            let dataURL = '';
            let video = document.createElement("video");
            video.setAttribute('crossOrigin', 'anonymous');//處理跨域
            video.setAttribute('src', url);
            video.setAttribute('width', 400);
            video.setAttribute('height', 240);
            video.setAttribute('preload', 'auto');
            video.addEventListener('loadeddata', function () {
                let canvas = document.createElement("canvas"),
                    width = video.width, //canvas的尺寸和圖片一樣
                    height = video.height;
                canvas.width = width;
                canvas.height = height;
                canvas.getContext("2d").drawImage(video, 0, 0, width, height); //繪制canvas
                dataURL = canvas.toDataURL('image/jpeg'); //轉換為base64
                resolve(dataURL);
            });
        })
    }
  },
};
</script>

<style lang="less" scoped>
.disabled .el-upload--picture-card {
  display: none;
}
.el-upload-list__item>div {
  width: 100%;
  height: 100%;
}
</style>

 let exhibitShow = this.formValidate.exhibitShow.map(item => {
        return item.videoUrl || item.url || item;
      }).join(',');

 exhibitShow: data.exhibitShow ? data.exhibitShow.split(',').filter(item => item) : [],

exhibitShow:"http://49.7.218.51:9999/sdfs/static/image/28d4f32b-3e59-4c2b-8bfc-d88dae85e66e.png,http://49.7.218.51:9999/sdfs/static/image/1926e3a2-f581-43c8-9053-e9d3f10f68d1.png,http://49.7.218.51:9999/sdfs/static/image/dcccc445-c72f-4b6a-8f38-0a63f9790216.png"