using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Web;

namespace EmisTerminal.EIF
{
    public class IDCert
    {
        [DllImport("termb.dll")]
        public static extern int InitComm(int Port);
        [DllImport("termb.dll")]
        public static extern int CloseComm();
        [DllImport("termb.dll")]
        public static extern int Authenticate();
        [DllImport("termb.dll")]
        public static extern int Read_Content(int active);
        [DllImport("termb.dll")]
        public static extern int Read_Content_Path(string cPath, int active);
        [DllImport("termb.dll")]
        public static extern IntPtr GetIDNo();
        [DllImport("termb.dll", CharSet = CharSet.Auto)]
        public static extern bool GetIDNo2(ref byte sBuf, ref int nLen);
        [DllImport("termb.dll")]
        public static extern int GetSAMID(IntPtr c);
        [DllImport("termb.dll")]
        public static extern int ResetCard(int nReaderSlot, ref string pRecvDatas, ref int nRecvLen);

        public static bool isStop = false;

        public static int InitCommExt()
        {
            for (int i = 1001; i <= 1016; i++)
            {
                if (InitComm(i) == 0)
                {
                    return i;
                }
            }
            for (int i = 1; i <= 16; i++)
            {
                if (InitComm(i) == 0)
                {
                    return i;
                }
            }
            if (InitComm(2401) == 0)
            {
                return 2401;
            }

            return -6;
        }

        public static ResultMessage<String> Check()
        {
            try
            {
                isStop = true;

                Thread.Sleep(500);

                isStop = false;
                int port = IDCert.InitCommExt();
                if (port >= 0)
                {
                    while (!isStop)
                    {
                        IntPtr c = Marshal.AllocHGlobal(100);

                        int samRet = IDCert.GetSAMID(c);
                        int ret = IDCert.Authenticate();

                        if (ret == 0)
                        {
                            //int readRet = IDCert.Read_Content(1);
                            int readRet = IDCert.Read_Content_Path(HttpContext.Current.Server.MapPath("~/"), 1);
                            if (readRet == 0)
                            {
                                ResultMessage<String> result = new ResultMessage<String>();
                                result.IsSuccess = true;
                                result.Message = "成功";
                                byte[] arrTmp = new byte[100];
                                int nLen = 100;
                                IDCert.GetIDNo2(ref arrTmp[0], ref nLen);
                                result.Data = System.Text.Encoding.GetEncoding("GB2312").GetString(arrTmp.Take(nLen).ToArray());

                                return result;
                            }
                            else
                            {
                                IDCert.CloseComm();
                                IDCert.InitComm(port);
                            }
                        }
                        else if (ret == -12)
                        {
                            IDCert.CloseComm();
                            IDCert.InitComm(port);
                        }
                        Thread.Sleep(300);
                    }

                    ResultMessage<String> stopResult = new ResultMessage<String>();
                    stopResult.IsSuccess = false;
                    stopResult.Message = "正常退出。";

                    return stopResult;
                }
                else
                {
                    ResultMessage<String> result = new ResultMessage<String>();
                    result.IsSuccess = false;
                    result.Message = "找不到读卡器的端口，请确认是否已经安装了身份证读卡器硬件。";

                    return result;
                }
            }
            catch (Exception ex)
            {
                ResultMessage<String> result = new ResultMessage<String>();
                result.IsSuccess = false;
                result.Message = ex.Message;

                return result;
            }
            finally
            {
                IDCert.CloseComm();
            }
        }
    }
}