var watermark = {
  watermark(settings, el) {
    //默认设置
    let defaultSettings = {
      watermark_txt: 'text',
      watermark_x: 20, //水印起始位置x轴坐标
      watermark_y: 20, //水印起始位置Y轴坐标
      watermark_rows: 7, //水印行数
      watermark_cols: 20, //水印列数
      watermark_x_space: 100, //水印x轴间隔
      watermark_y_space: 50, //水印y轴间隔
      watermark_color: '#aaa', //水印字体颜色
      watermark_alpha: 0.4, //水印透明度
      watermark_fontsize: '15px', //水印字体大小
      watermark_font: '微软雅黑', //水印字体
      watermark_width: 210, //水印宽度
      watermark_height: 80, //水印长度
      watermark_angle: 20, //水印倾斜度数
      watermark_type: 1,
    }
    if (arguments.length > 1 && typeof arguments[0] === 'object') {
      let src = arguments[0] || {}
      for (let key in src) {
        if (
          src[key] &&
          defaultSettings[key] &&
          src[key] === defaultSettings[key]
        )
          continue
        else if (src[key]) defaultSettings[key] = src[key]
      }
    }
    let oTemp = document.createDocumentFragment()
    //获取页面最大宽度
    let page_width = Math.max(
      document.body.scrollWidth,
      document.body.clientWidth
    )
    let cutWidth = page_width * 0.015
    page_width = page_width - cutWidth
    //获取页面最大高度
    let page_height =
      Math.max(document.body.scrollHeight, document.body.clientHeight) + 450
    page_height = Math.max(page_height, window.innerHeight - 30)
    const dialogHeight = document.querySelector(
      '.form-print-dialog .el-dialog__body'
    ).scrollHeight
    const currentHeight =
      dialogHeight && dialogHeight > page_height ? dialogHeight : page_height
    //如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
    if (
      defaultSettings.watermark_cols == 0 ||
      parseInt(
        defaultSettings.watermark_x +
          defaultSettings.watermark_width * defaultSettings.watermark_cols +
          defaultSettings.watermark_x_space *
            (defaultSettings.watermark_cols - 1)
      ) > page_width
    ) {
      defaultSettings.watermark_cols = parseInt(
        (page_width -
          defaultSettings.watermark_x +
          defaultSettings.watermark_x_space) /
          (defaultSettings.watermark_width + defaultSettings.watermark_x_space)
      )
      defaultSettings.watermark_x_space = parseInt(
        (page_width -
          defaultSettings.watermark_x -
          defaultSettings.watermark_width * defaultSettings.watermark_cols) /
          (defaultSettings.watermark_cols - 1)
      )
    }
    //如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
    defaultSettings.watermark_rows = parseInt(
      (currentHeight - defaultSettings.watermark_y - 50) /
        (defaultSettings.watermark_height + defaultSettings.watermark_y_space)
    )
    // defaultSettings.watermark_y_space = parseInt(
    //   (currentHeight -
    //     defaultSettings.watermark_y -
    //     defaultSettings.watermark_height * defaultSettings.watermark_rows) /
    //     (defaultSettings.watermark_rows - 1)
    // )
    let x
    let y
    for (let i = 0; i < defaultSettings.watermark_rows; i++) {
      y =
        defaultSettings.watermark_y +
        (defaultSettings.watermark_y_space + defaultSettings.watermark_height) *
          i
      for (let j = 0; j < defaultSettings.watermark_cols; j++) {
        x =
          defaultSettings.watermark_x +
          (defaultSettings.watermark_width +
            defaultSettings.watermark_x_space) *
            j
        let mask_div = document.createElement('div')
        mask_div.id = 'mask_div' + i + j
        mask_div.className = 'mask_div'
        if (defaultSettings.watermark_type === 1) {
          mask_div.appendChild(
            document.createTextNode(defaultSettings.watermark_txt)
          )
        } else {
          mask_div.style.backgroundImage =
            'url(' + defaultSettings.watermark_txt + ')'
          mask_div.style.backgroundRepeat = 'no-repeat'
          mask_div.style.backgroundSize = '100% 100%'
        }

        //设置水印div倾斜显示
        mask_div.style.MozTransform =
          'rotate(-' + defaultSettings.watermark_angle + 'deg)'
        mask_div.style.msTransform =
          'rotate(-' + defaultSettings.watermark_angle + 'deg)'
        mask_div.style.OTransform =
          'rotate(-' + defaultSettings.watermark_angle + 'deg)'
        mask_div.style.transform =
          'rotate(-' + defaultSettings.watermark_angle + 'deg)'
        mask_div.style.visibility = ''
        mask_div.style.position = 'absolute'
        mask_div.style.left = x + 'px'
        mask_div.style.top = y + 'px'
        mask_div.style.overflow = 'hidden'
        mask_div.style.zIndex = '9999'
        //让水印不遮挡页面的点击事件
        mask_div.style.pointerEvents = 'none'
        mask_div.style.opacity = defaultSettings.watermark_alpha
        mask_div.style.fontSize = defaultSettings.watermark_fontsize
        mask_div.style.fontFamily = defaultSettings.watermark_font
        mask_div.style.color = defaultSettings.watermark_color
        mask_div.style.textAlign = 'center'
        mask_div.style.width = defaultSettings.watermark_width + 'px'
        mask_div.style.height = defaultSettings.watermark_height + 'px'
        mask_div.style.display = 'block'
        oTemp.appendChild(mask_div)
      }
    }
    ;(el || document.body).appendChild(oTemp)
  },
}

export default watermark