using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;

namespace CounsellorBL
{
    public class PDFService : MessageBase
    {
        public string createPdfByHtml(string sHtml, string sFileName, string outputFolder)
        {
            string sRoot = System.Web.HttpContext.Current.Server.MapPath("/OutFiles");
            ServiceCom.fnCreateDir(sRoot + "\\" + outputFolder);//如果沒有該目錄就創建目錄
            string sOutputPath = sRoot + "\\" + outputFolder + "\\" + sFileName;
            string sHtmlPath = sOutputPath + ".html";
            string sPdfPath = sOutputPath + ".pdf";

            string sContent = System.Web.HttpContext.Current.Server.HtmlDecode(sHtml);
            if (System.IO.File.Exists(sHtmlPath))
            {
                System.IO.File.Delete(sHtmlPath);
            }
            using (FileStream fs = new FileStream(sHtmlPath, FileMode.Create))
            {
                using (StreamWriter w = new StreamWriter(fs, Encoding.UTF8))
                {
                    w.WriteLine(sContent);
                }
            }
            try
            {
                if (!string.IsNullOrEmpty(sHtmlPath) || !string.IsNullOrEmpty(sPdfPath))
                {
                    string resource = sRoot + "\\Resoure";
                    string dllstr = string.Format(resource + "\\wkhtmltopdf.exe");

                    if (System.IO.File.Exists(dllstr))
                    {
                        string strParam = sHtmlPath + " " + sPdfPath;
                        ProcessStartInfo pInfo = new ProcessStartInfo();
                        pInfo.FileName = dllstr;
                        pInfo.Arguments = strParam.ToString();
                        pInfo.UseShellExecute = false;
                        pInfo.RedirectStandardOutput = true;
                        //pInfo.RedirectStandardError = true;
                        pInfo.RedirectStandardInput = true;
                        pInfo.CreateNoWindow = false;

                        using (Process p = new Process())
                        {
                            p.StartInfo = pInfo;
                            p.Start();
                            p.WaitForExit();
                            try
                            {
                                if (!p.HasExited)
                                {
                                    p.Kill();
                                }
                            }
                            catch
                            { }
                        }
                    }
                }
                System.IO.File.Delete(sHtmlPath);//刪除html文件
            }
            catch (Exception ex)
            {
                throw new Exception(ex.ToString());
            }
            return sPdfPath;
        }
        public bool delPdf(string sPath)
        {
            bool blRet = true;
            try
            {
                if (System.IO.File.Exists(sPath))
                {
                    System.IO.File.Delete(sPath);
                }
            }
            catch
            {
                blRet = false;
            }
            return blRet;
        }

        //字符串转流
        public static MemoryStream StringToStream(string s)
        {
            // convert string to stream            
            byte[] byteArray = Encoding.Default.GetBytes(s);
            MemoryStream stream = new MemoryStream(byteArray);
            return stream;
        }

        //流转字符串
        public static string StreamToString(Stream stream)
        {
            StreamReader reader = new StreamReader(stream);
            string text = reader.ReadToEnd();
            return text;
        }

        //字符串转字节数组
        public static Byte[] StringToByteArray(string s)
        {
            return Encoding.Default.GetBytes(s);
        }

        //字节数组转字符串
        public static string ByteArrayToString(Byte[] bytes)
        {
            return Encoding.Default.GetString(bytes);
        }
    }
}