//本專案使用 iText PDF 函式庫，其為 AGPL v3 授權版本：
//https://github.com/itext/itext-dotnet

//依據 AGPL 授權，本專案亦以 AGPL v3 授權釋出，所有原始碼公開且可自由使用、修改、散佈。
//以下程式使用.net framework 4.0，搭配iTextSharp


using System;
using System.Collections.Generic;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;

 class Program
    {
        static void Main(string[] args)
        {

            //單一資料匣轉檔 寫入另一資料匣
            trandpdf();
                                  

        }

       //  單一資料匣
        public static void trandpdf()
        {
            #region iTextSharp            
            
            string watermark = @"D:\TRANSFILE\LOGO\logo44.jpg";   // 浮水印圖片
            
            #endregion

            List<string> ls = new List<string>();
            string sourcepath = @"D:\TRANSFILE\PDF\source\";  //原始檔路徑
            string outpath = @"D:\TRANSFILE\PDF\makeing\";    //新寫入檔路徑
            FileSearch(sourcepath, "*.pdf", ref ls);
            string tempname, newfullname;
            foreach (string item in ls)
            {
                tempname = System.IO.Path.GetFileName(item);  //取得檔名
                newfullname = outpath + tempname;   //轉檔後的全檔名
                string isSurrcess = PDFWatermark(item, newfullname, watermark, 387, 295, 0, 0, 1,1);
                Console.WriteLine("轉出{0} , 轉檔結果:{1}", newfullname, isSurrcess);
            }

        }


       private static void FileSearch(string sDir, string filetype, ref List<string> ls)
        {
            try
            {
                foreach (string f in Directory.GetFiles(sDir, filetype))
                {
                    ls.Add(f);
                }
            }
            catch (System.Exception excpt)
            {
                Console.WriteLine(excpt.Message);
            }
        }


        /// <summary>
        /// 浮水印功能
        /// </summary>
        /// <param name="infilepath">輸入檔案地址</param>
        /// <param name="outfilepath">輸出檔案地址</param>
        /// <param name="picName">圖片檔案地址</param>
        /// <param name="picHeight">圖片高度（可選）</param>
        /// <param name="picWidth">圖片寬度（可選）</param>
        /// <param name="top">圖片在PDF中的位置Top（可選）</param>
        /// <param name="left">圖片在PDF中的位置Left（可選）</param>
        /// <param name="setencryption">要不要加列印保護 1加 0不加（可選）</param>
        /// <param name="setauthor">要不要重寫作者等meatdata資訊 1改寫 0不改寫（可選）</param>
        /// <returns></returns>
        public static string PDFWatermark(string infilepath, string outfilepath, string picName, float picHeight = 0, float picWidth = 0, float top = 0, float left = 0,int setencryption = 0,int setauthor=0)
        {
            PdfReader pdfReader = null;
            PdfStamper pdfStamper = null;

            //PdfReader.unethicalreading = true;
            try
            {
                pdfReader = new PdfReader(infilepath);
                
                int numberOfPages = pdfReader.NumberOfPages;
                iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);
                float width = psize.Width;
                float height = psize.Height;
                                
                pdfStamper = new PdfStamper(pdfReader, new FileStream(outfilepath, FileMode.Create));

                //加列印限制
                if (setencryption==1) pdfStamper.SetEncryption(PdfWriter.STRENGTH40BITS, null, null, PdfWriter.AllowScreenReaders);
                //重寫作者等meatdata資訊
                if (setauthor == 1)
                {
                    Dictionary<string, string> info = pdfReader.Info;
                    info.Remove("Author");
                    info.Add("Author", "作者資訊");
                    info.Remove("Subject");
                    info.Add("Subject", "主旨");
                    info.Remove("Title");
                    info.Add("Title", "抬頭");
                    info.Remove("Keywords");
                    info.Add("Keywords", "關鍵字");
                    pdfStamper.MoreInfo = info;
                }

                    PdfContentByte waterMarkContent;
                iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(picName);
                if (picHeight != 0) image.ScaleAbsoluteHeight(picHeight);
                else picHeight = image.Height;
                if (picWidth != 0) image.ScaleAbsoluteWidth(picWidth);
                else picWidth = image.Width;
                image.GrayFill = 20; // 透明度，灰色填充
                                     // image.Rotation // 旋轉
                                     // image.RotationDegrees // 旋轉角度
                                     // 水印的位置 
                if (left == 0) left = (width - picWidth) / 2;
                if (top == 0) top = (height - picHeight) / 2;
                image.SetAbsolutePosition(left, top);
                // 每一頁加水印,也可以設定某一頁加水印 
                for (int i = 1; i <= numberOfPages; i++)
                {
                    waterMarkContent = pdfStamper.GetUnderContent(i);//水印在最底層
                                                                     //這邊注意，如果想要水印在最頂層，這邊改成 pdfStamper.GetOverContent
                    waterMarkContent.AddImage(image);
                }
                return "轉檔完成";
            }
            catch (Exception ex)
            {                
                return ex.Message.Trim();
            }
            finally
            {
                if (pdfStamper != null) pdfStamper.Close();
                if (pdfReader != null) pdfReader.Close();
            }
        }


/*    
    Copyright (C) <2020>  <SFI>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/