using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace CollectInformation.HCUSBSDK
{
    class HCUSBUtils
    {
        public const int INITIALIZED_INDEX = 1;
        public uint m_VersionNum = 0;
        public string szLogPath = Application.StartupPath + "/UsbSDKLog/";
        public int g_nEnumDevIndex = INITIALIZED_INDEX;
        public CHCUsbSDK.USB_DEVICE_INFO[] m_aHidDevInfo;//这个存储着遍历到的设备，列表索引1开始，所以添加
        public static CHCUsbSDK.EnumDeviceCallBack m_OnEnumDeviceCallBack = null;//遍历设备的回调
        public int IndexOfInfo = INITIALIZED_INDEX;//信息列表更新信息的索引,初始值为1
        public CHCUsbSDK.USB_USER_LOGIN_INFO StruCurUsbLoginInfo = new CHCUsbSDK.USB_USER_LOGIN_INFO();
        public int UserID = -1;
        public string loginname = "admin";
        //public string loginpwd = "free2021!";
        public string loginpwd = "Admin123";

        /// <summary>
        /// 初始化SDK
        /// </summary>
        /// <returns>SDK版本号</returns>
        public string initSDK()
        {
            string r = null;

            bool res = CHCUsbSDK.USB_Init();//USB initialize
            IntPtr ptrLogPath = Marshal.StringToHGlobalAnsi(szLogPath);//写日志
            CHCUsbSDK.USB_SetLogToFile(3, ptrLogPath, false);//这里用枚举参数不匹配，直接写了3,
            Marshal.FreeHGlobal(ptrLogPath);
            m_VersionNum = CHCUsbSDK.USB_GetSDKVersion();
            r = string.Format("{0}.{1}.{2}.{3}", (0xff000000 & m_VersionNum) >> 24, (0x00ff0000 & m_VersionNum) >> 16, (0x0000ff00 & m_VersionNum) >> 8, (0x000000ff & m_VersionNum));
            return r;
        }

        /// <summary>
        /// 遍历设备
        /// </summary>
        public bool TraverseDevice()
        {
            bool r = false;
            this.m_aHidDevInfo = new CHCUsbSDK.USB_DEVICE_INFO[CHCUsbSDK.MAX_USB_DEV_LEN];
            this.g_nEnumDevIndex = 1;
            bool bExceedFlag = false;
            int dwCount = CHCUsbSDK.USB_GetDeviceCount();
            CHCUsbSDK.USB_DEVICE_INFO struDeviceInfo = new CHCUsbSDK.USB_DEVICE_INFO();
            struDeviceInfo.Init();
            IntPtr pDeviceInfo = Marshal.AllocHGlobal(dwCount * Marshal.SizeOf(struDeviceInfo));
            //清空内存空间
            for (int i = 0; i < dwCount * Marshal.SizeOf(struDeviceInfo); i++)
            {
                Marshal.WriteByte(pDeviceInfo, i, 0);
            }
            IntPtr pTempDeviceInfo = IntPtr.Zero;

            if (CHCUsbSDK.USB_EnumDevices(dwCount, pDeviceInfo))                    //枚举设备
            {
                pTempDeviceInfo = pDeviceInfo;
                while (--dwCount >= 0)
                {
                    struDeviceInfo = new CHCUsbSDK.USB_DEVICE_INFO();
                    struDeviceInfo = (CHCUsbSDK.USB_DEVICE_INFO)Marshal.PtrToStructure(pTempDeviceInfo, typeof(CHCUsbSDK.USB_DEVICE_INFO));
                    if (this.g_nEnumDevIndex == 64)
                    {
                        bExceedFlag = true;
                        break;
                    }
                    this.m_aHidDevInfo[this.g_nEnumDevIndex - 1] = struDeviceInfo;        //存储到数组中方便登录获取数据
                    this.g_nEnumDevIndex++;//更新索引
                    pTempDeviceInfo += Marshal.SizeOf(struDeviceInfo);
                }
                if (bExceedFlag)
                {
                    MessageBox.Show("The total number of devices could not be over 64numbers", "Error", MessageBoxButtons.OK);
                }
                else
                {
                    r = true;
                }
            }
            else
            {
                MessageBox.Show(GetErrorMsg(), "Error", MessageBoxButtons.OK);
            }

            //释放内存
            if (pDeviceInfo != IntPtr.Zero)
            {
                Marshal.FreeHGlobal(pDeviceInfo);
                pDeviceInfo = IntPtr.Zero;
                pTempDeviceInfo = IntPtr.Zero;
            }

            if (pTempDeviceInfo != IntPtr.Zero)
            {
                Marshal.FreeHGlobal(pTempDeviceInfo);
                pTempDeviceInfo = IntPtr.Zero;
            }

            return r;
        }
        /// <summary>
        /// 登录第一个设备，必须在遍历设备之后执行
        /// </summary>
        /// <returns></returns>
        public bool LoginDevice()
        {
            return LoginDevice(0);
        }
        /// <summary>
        /// 登录第设备，必须在遍历设备之后执行
        /// </summary>
        /// <param name="index">要登录的设备在列表中的位置</param>
        /// <returns></returns>
        public bool LoginDevice(int index)
        {
            bool r = false;

            if (!JudgeValidOfLoginInfo())
            {
                return r;
            }
            StruCurUsbLoginInfo.init();

            StruCurUsbLoginInfo.dwSize = (int)Marshal.SizeOf(StruCurUsbLoginInfo);
            StruCurUsbLoginInfo.dwTimeout = 5000;//登录超时时间是5秒
            StruCurUsbLoginInfo.dwVID = this.m_aHidDevInfo[index].dwVID;
            StruCurUsbLoginInfo.dwPID = this.m_aHidDevInfo[index].dwPID;

            System.Array.Copy(this.m_aHidDevInfo[index].szSerialNumber, StruCurUsbLoginInfo.szSerialNumber, this.m_aHidDevInfo[index].szSerialNumber.Length);

            byte[] TempUserArr = System.Text.Encoding.Default.GetBytes(this.loginname);
            System.Array.Copy(TempUserArr, StruCurUsbLoginInfo.szUserName, TempUserArr.Length);

            byte[] TempszPassword = System.Text.Encoding.Default.GetBytes(this.loginpwd);
            System.Array.Copy(TempszPassword, StruCurUsbLoginInfo.szPassword, TempszPassword.Length);


            CHCUsbSDK.USB_DEVICE_REG_RES StruDeviceRegRes = new CHCUsbSDK.USB_DEVICE_REG_RES();
            StruDeviceRegRes.init();
            StruDeviceRegRes.dwSize = (int)Marshal.SizeOf(StruDeviceRegRes);

            int UserIDTemp = UserID;

            UserID = CHCUsbSDK.USB_Login(ref StruCurUsbLoginInfo, ref StruDeviceRegRes);
            if (UserID == CHCUsbSDK.INVALID_USER_ID)
            {
                GetErrorMsg();
                UserID = UserIDTemp;//为了解决重复登录时的问题，但是这次只考虑了只能登录一个设备，两个设备同时能登录的话，ID会覆盖得继续解决ID的问题
            }
            else
            {
                string SuccesfulLoginInfo = "SUCCESS USB_Login,The device whose serial number is " + System.Text.Encoding.Default.GetString(StruCurUsbLoginInfo.szSerialNumber) + "login in successfully";
                r = true;
            }

            return r;
        }

        /// <summary>
        /// 人像采集
        /// </summary>
        /// <param name="filePath">人像临时保存位置</param>
        /// <param name="imageName">图片名称，获取到多个图片会按照顺序从0开始加前缀“0_”</param>
        /// <returns>其他结果内容</returns>
        public string CaptureFace(string filePath, string imageName)
        {
            string r = null;

            CHCUsbSDK.USB_PT_PARAM struPTparam = new CHCUsbSDK.USB_PT_PARAM();
            struPTparam.Init();

            Int32 nInSize = Marshal.SizeOf(struPTparam);
            struPTparam.dwSize = nInSize;

            string strRequestUrl = "POST /ISAPI/AccessControl/CaptureFaceData";
            int dwRequestUrlLen = strRequestUrl.Length;
            struPTparam.pRequestUrl = Marshal.StringToHGlobalAnsi(strRequestUrl);
            struPTparam.dwRequestUrlLen = dwRequestUrlLen;

            string strInputParam = "<CaptureFaceDataCond xmlns=\"http://www.isapi.org/ver20/XMLSchema\" version=\"2.0\">" +
                    "<captureInfrared>true</captureInfrared>" +
                    "<dataType>binary</dataType>" +
                    "<readerID>1</readerID>" +
                    "</CaptureFaceDataCond>";
            struPTparam.pInBuffer = Marshal.StringToHGlobalAnsi(strInputParam);
            struPTparam.dwInSize = strInputParam.Length;

            struPTparam.pOutBuffer = Marshal.AllocHGlobal(1024 * 1024);
            struPTparam.dwOutSize = 1024 * 1024;

            //存放人脸采集返回的图片数据的缓冲区
            struPTparam.struData[0].pDataBuffer = Marshal.AllocHGlobal(300 * 1024);
            struPTparam.struData[0].dwDataSize = 300 * 1024;
            struPTparam.struData[1].pDataBuffer = Marshal.AllocHGlobal(300 * 1024);
            struPTparam.struData[1].dwDataSize = 300 * 1024;

            struPTparam.dwSendTimeOut = 200000; //发送超时时间
            struPTparam.dwRecvTimeOut = 200000; //接收超时时间

            if (!CHCUsbSDK.USB_TransConfig(UserID, ref struPTparam))
            {
                String strErr = "USB_TransConfig failed, error code= " + CHCUsbSDK.USB_GetLastError();
                MessageBox.Show(strErr);
            }
            else
            {
                int iSize = struPTparam.dwOutSize;

                byte[] byOutPut = new byte[iSize];
                Marshal.Copy(struPTparam.pOutBuffer, byOutPut, 0, iSize);
                r = System.Text.Encoding.UTF8.GetString(byOutPut).TrimEnd('\0');

                for (int i = 0; i < struPTparam.byNumOfData; i++)
                {
                    //保存数据
                    if ((struPTparam.struData[i].dwDataSize != 0) && (struPTparam.struData[i].pDataBuffer != IntPtr.Zero))
                    {
                        if (!Directory.Exists(filePath))//路径不存在
                        {
                            Directory.CreateDirectory(filePath);//创建新路径
                        }

                        string strFileName = filePath + "\\" + i + "_" + imageName;
                        FileStream fs = new FileStream(strFileName, FileMode.Create);
                        int iLen = (int)struPTparam.struData[i].dwDataSize;
                        byte[] by = new byte[iLen];
                        Marshal.Copy(struPTparam.struData[i].pDataBuffer, by, 0, iLen);
                        fs.Write(by, 0, iLen);
                        fs.Close();
                    }
                }

                //释放内存
                if (struPTparam.pRequestUrl != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pRequestUrl);
                    struPTparam.pRequestUrl = IntPtr.Zero;
                }

                if (struPTparam.pInBuffer != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pInBuffer);
                    struPTparam.pInBuffer = IntPtr.Zero;
                }

                if (struPTparam.pOutBuffer != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pOutBuffer);
                    struPTparam.pOutBuffer = IntPtr.Zero;
                }

                for (int i = 0; i < CHCUsbSDK.MAX_DATA_NUM; i++)
                {
                    if (struPTparam.struData[0].pDataBuffer != IntPtr.Zero)
                    {
                        Marshal.FreeHGlobal(struPTparam.struData[0].pDataBuffer);
                        struPTparam.struData[0].pDataBuffer = IntPtr.Zero;
                    }
                }
            }

            return r;
        }
        /// <summary>
        /// 采集指纹或身份证信息
        /// </summary>
        /// <param name="type">采集类型：1、身份证；2、指纹</param>
        /// <param name="inputStr">输入参数</param>
        /// <returns>采集结果</returns>
        public string CollectionNoImage(int type, string inputStr)
        {
            string r = null;

            CHCUsbSDK.USB_PT_PARAM struPTparam = new CHCUsbSDK.USB_PT_PARAM();
            struPTparam.Init();

            Int32 nInSize = Marshal.SizeOf(struPTparam);
            struPTparam.dwSize = nInSize;

            string strRequestUrl = "";
            if (type == 1)
            {
                // 身份证采集
                strRequestUrl = "POST /ISAPI/AccessControl/CaptureIDInfo?format=json";
            }
            else
            {
                // 指纹采集
                strRequestUrl = "POST /ISAPI/AccessControl/CaptureFingerPrint";
            }
            int dwRequestUrlLen = strRequestUrl.Length;
            struPTparam.pRequestUrl = Marshal.StringToHGlobalAnsi(strRequestUrl);
            struPTparam.dwRequestUrlLen = dwRequestUrlLen;

            string strInputParam = inputStr;
            struPTparam.pInBuffer = Marshal.StringToHGlobalAnsi(strInputParam);
            struPTparam.dwInSize = strInputParam.Length;

            struPTparam.pOutBuffer = Marshal.AllocHGlobal(1024 * 1024);
            struPTparam.dwOutSize = 1024 * 1024;

            struPTparam.dwSendTimeOut = 20000; //发送超时时间
            struPTparam.dwRecvTimeOut = 20000; //接收超时时间

            if (!CHCUsbSDK.USB_TransConfig(UserID, ref struPTparam))
            {
                String strErr = "USB_TransConfig failed, error code= " + CHCUsbSDK.USB_GetLastError();
                MessageBox.Show(strErr);
            }
            else
            {
                int iSize = struPTparam.dwOutSize;

                byte[] byOutPut = new byte[iSize];
                Marshal.Copy(struPTparam.pOutBuffer, byOutPut, 0, iSize);
                r = System.Text.Encoding.UTF8.GetString(byOutPut);


                //释放内存
                if (struPTparam.pRequestUrl != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pRequestUrl);
                    struPTparam.pRequestUrl = IntPtr.Zero;
                }

                if (struPTparam.pInBuffer != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pInBuffer);
                    struPTparam.pInBuffer = IntPtr.Zero;
                }

                if (struPTparam.pOutBuffer != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(struPTparam.pOutBuffer);
                    struPTparam.pOutBuffer = IntPtr.Zero;
                }

                for (int i = 0; i < CHCUsbSDK.MAX_DATA_NUM; i++)
                {
                    if (struPTparam.struData[0].pDataBuffer != IntPtr.Zero)
                    {
                        Marshal.FreeHGlobal(struPTparam.struData[0].pDataBuffer);
                        struPTparam.struData[0].pDataBuffer = IntPtr.Zero;
                    }
                }
            }

            return r;
        }

        /// <summary>
        /// 转换USB_SDK_GetErrorMsg的结果成字符串
        /// </summary>
        /// <returns>字符串信息</returns>
        public string GetErrorMsg()
        {
            string r = "";
            IntPtr res = IntPtr.Zero;
            try
            {
                uint Error = CHCUsbSDK.USB_GetLastError();
                res = CHCUsbSDK.USB_GetErrorMsg(Error);
                string sRes = Marshal.PtrToStringAnsi(res);
                r = sRes;
                res = IntPtr.Zero;
            }
            catch
            {
                res = IntPtr.Zero;
                r = "Fail To Show USB Error Message in Log Information.";
            }
            return r;
        }

        /// <summary>
        /// 判断登录设备的相关信息是否是有效的
        /// </summary>
        /// <returns></returns>
        private Boolean JudgeValidOfLoginInfo()
        {
            if (m_aHidDevInfo == null || m_aHidDevInfo.Length <= 0)
            {
                MessageBox.Show("No device .", "Attention", MessageBoxButtons.OK);
                return false;
            }
            return true;
        }

    }
}