package pdf

import (
	"encoding/base64"
	"errors"
	"github.com/SebastiaanKlippert/go-wkhtmltopdf"
	"strings"
)

/*
html转 Pdf
outFile为空则不保存(使用该方法需要安装工具 sudo apt-get install wkhtmltopdf)
*/
func HtmlToPdfBase64(content string, dataType string, outFile ...string) (string, error) {
	pdfg, err := wkhtmltopdf.NewPDFGenerator()
	if err != nil {
		return "", err
	}
	switch dataType {
	case "url": //网页地址
		pdfg.AddPage(wkhtmltopdf.NewPage(content))
	case "html": //网页内容
		pdfg.AddPage(wkhtmltopdf.NewPageReader(strings.NewReader(content)))
	default:
		return "", errors.New("invalid type")
	}
	//模式
	pdfg.Orientation.Set(wkhtmltopdf.OrientationPortrait)
	//pdf尺寸默认A4纸
	pdfg.PageSize.Set(wkhtmltopdf.PageSizeA4)
	// Create PDF document in memory
	if err = pdfg.Create(); err != nil {
		return "", err
	}
	// Write PDF to file
	if len(outFile) != 0 {
		if err = pdfg.WriteFile(outFile[0]); err != nil {
			return "", err
		}
	}
	return base64.StdEncoding.EncodeToString(pdfg.Bytes()), nil
}