import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default {
  install (Vue, options) {
    Vue.prototype.getPdf = function (idStr, title) {
      html2Canvas(document.querySelector('#' + idStr), {
        allowTaint: true,
        scale: 2 // 提升画面质量，但是会增加文件大小
      }).then(function (canvas) {
        // var contentWidth = canvas.width
        // var contentHeight = canvas.height

        // var pageData = canvas.toDataURL('image/jpeg', 0.4)

        // var pdfWidth = ((contentWidth + 10) / 2) * 0.75
        // var pdfHeight = ((contentHeight + 200) / 2) * 0.75 // 500为底部留白

        // var imgWidth = pdfWidth
        // var imgHeight = (contentHeight / 2) * 0.75 // 内容图片这里不需要留白的距离

        // var pdf = new JsPDF('', 'pt', [pdfWidth, pdfHeight])
        // pdf.addImage(pageData, 'jpeg', 0, 0, imgWidth, imgHeight)
        // // pdf.save('report_pdf_' + new Date().getTime() + '.pdf')
        // pdf.save(title + '.pdf')

        let contentWidth = canvas.width
        let contentHeight = canvas.height
        let pageHeight = (contentWidth / 592.28) * 841.89
        let leftHeight = contentHeight
        let position = 0
        let imgWidth = 595.28
        let imgHeight = (592.28 / contentWidth) * contentHeight
        let pageData = canvas.toDataURL('image/jpeg', 0.4)
        let PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage()
            }
          }
        }
        PDF.save(title + '.pdf')
      })
    }
  }
}
