const math = require('../../utils/math') //导入模块

Component({
  options: {
    addGlobalClass: true,
    multipleSlots: true
  },
  properties: {
    imageList: {
      type: Array,
      value: []
    },
    clickable: {
      type: Boolean,
      value: false
    },
    column: {
      type: Number,
      value: 5
    }
  },
  data: {
    width: '138rpx',
    heightList: []
  },
  observers: {
    'column': function () {
      var square = math.minus(math.divide(750, this.data.column), 12) + 'rpx'
      this.setData({ width: square })
    }
  },
  methods: {
    viewImage: function (e) {
      if (!this.data.clickable) {
        return
      }
      var index = e.currentTarget.dataset.index
      var url = this.data.imageList[index]
      if (this.isPdfUrl(url)) {
        var filepath = wx.env.USER_DATA_PATH + url.substring(url.lastIndexOf('/'))
        // 1: 获取本地是否有文件，
        wx.getFileInfo({
          filePath: filepath,
          success (res) {
            // 2: 如果有变打开
            wx.openDocument({ filePath: filepath })
          },
          fail: function (error) {
            // 2: 没有就开始下载
            wx.showLoading({ title: '加载中', mask: true })
            wx.downloadFile({
              url: url, 
              filePath: filepath,
              // 3: 下载之后便打开
              success: function (res) {
                wx.openDocument({filePath: res.filePath})
              },
              complete: function (res) {
                wx.hideLoading()
              }
            })
          }
        })
        return
      }
      var imgList = []
      for (let index = 0; index < this.data.imageList.length; index++) {
        if(!this.isPdfUrl(this.data.imageList[index])){
          imgList.push(this.data.imageList[index])
        }
      }
      wx.previewImage({ urls: imgList, current: url })
    },
    isPdfUrl: function (url) {
      if (url && (url.indexOf('.pdf') >= 0 || url.indexOf('.PDF') >= 0)) {
        return true
      }
      return false
    }
  }
})