using HighWayIot.Config;
using HighWayIot.Log4net;
using MvCodeReaderSDKNet;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Aucma.Scada.HikRobot
{
    /// <summary>
    /// 海康扫码器
    /// </summary>
    public class GrabImage
    {
        #region 单例实现
        private static readonly Lazy<GrabImage> lazy = new Lazy<GrabImage>(() => new GrabImage());
        public static GrabImage Instance
        {
            get
            {
                return lazy.Value;
            }
        }
        #endregion

        #region 对象引用
        private AppConfig appConfig = AppConfig.Instance;
        private LogHelper logHelper = LogHelper.Instance;
        #endregion

        #region 委托事件
        public delegate void RefreshMaterialCodeStr(string materialCodeStr);
        public event RefreshMaterialCodeStr RefreshMaterialCodeStrEvent;

        /// <summary>
        /// 日志信息刷新
        /// </summary>
        /// <param name="message"></param>
        public delegate void RefreshLogMessage(string message);
        public event RefreshLogMessage RefreshLogMessageEvent;
        #endregion

        #region 私有变量
        private List<MvCodeReader> mvCodeReaders = new List<MvCodeReader>();

        private string lastStr = string.Empty;
        #endregion

        private GrabImage()
        {
            
        }

        public void InitHikRobot()
        {
            int nRet = MvCodeReader.MV_CODEREADER_OK;
            MvCodeReader device = new MvCodeReader();
            do
            {
                // 枚举设备 
                MvCodeReader.MV_CODEREADER_DEVICE_INFO_LIST stDevList = new MvCodeReader.MV_CODEREADER_DEVICE_INFO_LIST();
                nRet = MvCodeReader.MV_CODEREADER_EnumDevices_NET(ref stDevList, MvCodeReader.MV_CODEREADER_GIGE_DEVICE);
                if (MvCodeReader.MV_CODEREADER_OK != nRet)
                {
                    Console.WriteLine("Enum device failed:{0:x8}", nRet);
                    break;
                }
                RefreshLogMessageEvent?.Invoke("海康扫码器初始化枚举设备信息，Enum device count :  " + Convert.ToString(stDevList.nDeviceNum));
                if (0 == stDevList.nDeviceNum)
                {
                    break;
                }

                MvCodeReader.MV_CODEREADER_DEVICE_INFO stDevInfo;                            // 通用设备信息

                // 打印设备信息 ,选择指定IP的设备
                for (Int32 i = 0; i < stDevList.nDeviceNum; i++)
                {
                    stDevInfo = (MvCodeReader.MV_CODEREADER_DEVICE_INFO)Marshal.PtrToStructure(stDevList.pDeviceInfo[i], typeof(MvCodeReader.MV_CODEREADER_DEVICE_INFO));

                    if (MvCodeReader.MV_CODEREADER_GIGE_DEVICE == stDevInfo.nTLayerType)
                    {
                        MvCodeReader.MV_CODEREADER_GIGE_DEVICE_INFO stGigEDeviceInfo = (MvCodeReader.MV_CODEREADER_GIGE_DEVICE_INFO)MvCodeReader.ByteToStruct(stDevInfo.SpecialInfo.stGigEInfo, typeof(MvCodeReader.MV_CODEREADER_GIGE_DEVICE_INFO));
                        string ip = ((stGigEDeviceInfo.nCurrentIp & 0xff000000) >> 24) + "." + ((stGigEDeviceInfo.nCurrentIp & 0x00ff0000) >> 16) + "." + ((stGigEDeviceInfo.nCurrentIp & 0x0000ff00) >> 8) + "." + (stGigEDeviceInfo.nCurrentIp & 0x000000ff);
                        RefreshLogMessageEvent?.Invoke($"打印扫码设备信息，下标：{i}；IP：{ip}");
                        if (ip == appConfig.foamHikRobotIp)
                        {
                            Grab(i, stDevList, stDevInfo, device);
                            continue;
                        }
                    }
                }

                
            } while (false);

        }

        private void Grab(int index,MvCodeReader.MV_CODEREADER_DEVICE_INFO_LIST stDevList, MvCodeReader.MV_CODEREADER_DEVICE_INFO stDevInfo,MvCodeReader device)
        {
            try
            {
                Task.Run(() =>
                {
                    int nRet = MvCodeReader.MV_CODEREADER_OK;
                    do
                    {
                        stDevInfo = (MvCodeReader.MV_CODEREADER_DEVICE_INFO)Marshal.PtrToStructure(stDevList.pDeviceInfo[index], typeof(MvCodeReader.MV_CODEREADER_DEVICE_INFO));

                        // 创建设备 
                        nRet = device.MV_CODEREADER_CreateHandle_NET(ref stDevInfo);
                        if (MvCodeReader.MV_CODEREADER_OK != nRet)
                        {
                            RefreshLogMessageEvent?.Invoke($"Create device failed:{nRet}");
                            break;
                        }
                        else
                        {
                            RefreshLogMessageEvent?.Invoke("泡后库扫码器创建成功");
                        }

                        // 打开设备 
                        nRet = device.MV_CODEREADER_OpenDevice_NET();
                        if (MvCodeReader.MV_CODEREADER_OK != nRet)
                        {
                            RefreshLogMessageEvent?.Invoke("Open device failed:{nRet}");
                            break;
                        }
                        else
                        {
                            mvCodeReaders.Add(device);
                            RefreshLogMessageEvent?.Invoke("泡后库扫码器打开成功");
                        }

                        // 设置触发模式为off
                        if (MvCodeReader.MV_CODEREADER_OK != device.MV_CODEREADER_SetEnumValue_NET("TriggerMode", 0))
                        {
                            Console.WriteLine("Set TriggerMode failed!");
                            break;
                        }
                        else
                        {
                            RefreshLogMessageEvent?.Invoke("泡后库扫码器设置触发模式为off");
                        }

                        // 开启抓图 
                        nRet = device.MV_CODEREADER_StartGrabbing_NET();
                        if (MvCodeReader.MV_CODEREADER_OK != nRet)
                        {
                            Console.WriteLine("Start grabbing failed:{0:x8}", nRet);
                            break;
                        }
                        else
                        {
                            RefreshLogMessageEvent?.Invoke("泡后库扫码器开启抓图");
                        }

                        int nCount = 0;
                        IntPtr pBufForDriver = IntPtr.Zero;

                        MvCodeReader.MV_CODEREADER_IMAGE_OUT_INFO_EX2 stFrameInfo = new MvCodeReader.MV_CODEREADER_IMAGE_OUT_INFO_EX2();
                        IntPtr pstFrameInfo = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MvCodeReader.MV_CODEREADER_IMAGE_OUT_INFO_EX2)));
                        Marshal.StructureToPtr(stFrameInfo, pstFrameInfo, false);

                        while (nCount++ != 10)
                        {
                            nRet = device.MV_CODEREADER_GetOneFrameTimeoutEx2_NET(ref pBufForDriver, pstFrameInfo, 1000);
                            // 获取一帧图像
                            if (MvCodeReader.MV_CODEREADER_OK == nRet)
                            {
                                stFrameInfo = (MvCodeReader.MV_CODEREADER_IMAGE_OUT_INFO_EX2)Marshal.PtrToStructure(pstFrameInfo, typeof(MvCodeReader.MV_CODEREADER_IMAGE_OUT_INFO_EX2));

                                // 分配条码内存空间
                                MvCodeReader.MV_CODEREADER_RESULT_BCR_EX2 stBcrResult = (MvCodeReader.MV_CODEREADER_RESULT_BCR_EX2)Marshal.PtrToStructure(stFrameInfo.pstCodeListEx, typeof(MvCodeReader.MV_CODEREADER_RESULT_BCR_EX2));

                                for (int i = 0; i < stBcrResult.nCodeNum; ++i)
                                {
                                    bool bIsValidUTF8 = IsTextUTF8(stBcrResult.stBcrInfoEx2[i].chCode);
                                    if (bIsValidUTF8)
                                    {
                                        string strCode = Encoding.UTF8.GetString(stBcrResult.stBcrInfoEx2[i].chCode);
                                        Console.WriteLine("Get CodeNum: " + "CodeNum[" + i.ToString() + "], CodeString[" + strCode.Trim().TrimEnd('\0') + "]");
                                    }
                                    else
                                    {
                                        byte[] buffer = new byte[22];
                                        if (stBcrResult.stBcrInfoEx2[i].chCode.Length > 0)
                                        {
                                            Array.Copy(stBcrResult.stBcrInfoEx2[i].chCode, buffer, 22);
                                        }
                                        string strCode = Encoding.GetEncoding("UTF-8").GetString(buffer);
                                        RefreshLogMessageEvent?.Invoke("Get CodeNum: " + "CodeNum[" + i.ToString() + "], CodeString[" + strCode.Trim().TrimEnd('\0') + "]");
                                        if (!string.IsNullOrEmpty(strCode))
                                        {
                                            if(strCode != lastStr)
                                            {
                                                RefreshMaterialCodeStrEvent?.Invoke(strCode);
                                            }
                                            lastStr = strCode;
                                        }
                                    }
                                }
                                continue;
                            }
                            else
                            {
                                Console.WriteLine("No data:{0:x8}", nRet);
                            }

                            Thread.Sleep(3000);
                        }
                    } while (false);
                });
            }catch(Exception ex)
            {
                logHelper.Error("扫码异常", ex);
            }
            
        }

        public void ExitHikRobot()
        {
            int nRet = MvCodeReader.MV_CODEREADER_OK;
            foreach (var device in mvCodeReaders)
            {
                // 停止抓图
                nRet = device.MV_CODEREADER_StopGrabbing_NET();
                if (MvCodeReader.MV_CODEREADER_OK != nRet)
                {
                    Console.WriteLine("Stop grabbing failed{0:x8}", nRet);
                    continue;
                }

                // 关闭设备
                nRet = device.MV_CODEREADER_CloseDevice_NET();
                if (MvCodeReader.MV_CODEREADER_OK != nRet)
                {
                    Console.WriteLine("Close device failed{0:x8}", nRet);
                    continue;
                }

                // 销毁设备
                nRet = device.MV_CODEREADER_DestroyHandle_NET();
                if (MvCodeReader.MV_CODEREADER_OK != nRet)
                {
                    Console.WriteLine("Destroy device failed:{0:x8}", nRet);
                    continue;
                }
            }
            mvCodeReaders = new List<MvCodeReader>();
        }

        // 判断字符编码
        private bool IsTextUTF8(byte[] inputStream)
        {
            int encodingBytesCount = 0;
            bool allTextsAreASCIIChars = true;

            for (int i = 0; i < inputStream.Length; i++)
            {
                byte current = inputStream[i];

                if ((current & 0x80) == 0x80)
                {
                    allTextsAreASCIIChars = false;
                }
                // First byte
                if (encodingBytesCount == 0)
                {
                    if ((current & 0x80) == 0)
                    {
                        // ASCII chars, from 0x00-0x7F
                        continue;
                    }

                    if ((current & 0xC0) == 0xC0)
                    {
                        encodingBytesCount = 1;
                        current <<= 2;

                        // More than two bytes used to encoding a unicode char.
                        // Calculate the real length.
                        while ((current & 0x80) == 0x80)
                        {
                            current <<= 1;
                            encodingBytesCount++;
                        }
                    }
                    else
                    {
                        // Invalid bits structure for UTF8 encoding rule.
                        return false;
                    }
                }
                else
                {
                    // Following bytes, must start with 10.
                    if ((current & 0xC0) == 0x80)
                    {
                        encodingBytesCount--;
                    }
                    else
                    {
                        // Invalid bits structure for UTF8 encoding rule.
                        return false;
                    }
                }
            }

            if (encodingBytesCount != 0)
            {
                // Invalid bits structure for UTF8 encoding rule.
                // Wrong following bytes count.
                return false;
            }

            // Although UTF8 supports encoding for ASCII chars, we regard as a input stream, whose contents are all ASCII as default encoding.
            return !allTextsAreASCIIChars;
        }

    }
}