using System.Runtime.InteropServices;
using System.Text;

namespace EC.Util.CameraSDK;

public class HiKSdk : ICameraSdk
{
    #region Fields

    private int LoginId { get; set; } = -1;

    private int Channel { get; } = 1;

    #endregion Fields

    public HiKSdk(CameraInfo cameraInfo) : base(cameraInfo)
    {
    }

    #region Base Method

    public override bool Init()
    {
        bool ret = ConnectSuccess();
        if (ret) return true;
        HiKOriSdk.NET_DVR_USER_LOGIN_INFO loginInfo = new()
        {
            bUseAsynLogin = false,
            sDeviceAddress = new byte[129],
            wPort = (ushort)CameraInfo.Port,
            sUserName = new byte[64],
            sPassword = new byte[64]
        };
        Encoding.Default.GetBytes(CameraInfo.Ip).CopyTo(loginInfo.sDeviceAddress, 0);
        Encoding.Default.GetBytes(CameraInfo.UserName).CopyTo(loginInfo.sUserName, 0);
        Encoding.Default.GetBytes(CameraInfo.Password).CopyTo(loginInfo.sPassword, 0);
        HiKOriSdk.NET_DVR_DEVICEINFO_V40 deviceInfo = new();
        LoginId = HiKOriSdk.NET_DVR_Login_V40(ref loginInfo, ref deviceInfo);
        ret = ConnectSuccess();
        if (ret) HiKOriSdk.NET_DVR_SetReconnect(10000, 1);
        else BuildException();
        //HiKOriSdk.NET_DVR_DEVICEINFO_V30 deviceInfo = new();
        //LoginId = HiKOriSdk.NET_DVR_Login_V30(CameraInfo.Ip, CameraInfo.Port, CameraInfo.UserName, CameraInfo.Password, ref deviceInfo);
        return ret;
    }

    public override bool Destory()
    {
        bool ret = ConnectSuccess();
        if (!ret) return true;
        ret = HiKOriSdk.NET_DVR_Logout(LoginId);
        if (ret) LoginId = -1;
        else BuildException();
        return ret;
    }

    public override bool ConnectSuccess()
    {
        return LoginId >= 0;
    }

    internal override void BuildException()
    {
        uint errCode = HiKOriSdk.NET_DVR_GetLastError();
        if (errCode == 0) return;
        throw CameraException.New(CameraInfo, (int)errCode);
    }

    private void BuildPlayCtrlException(int nPort)
    {
        string err = $"PlayCtrlSdk failed, error code={PlayCtrlSdk.PlayM4_GetLastError(nPort)}";
        throw CameraException.New(CameraInfo, -1, err);
    }

    #endregion Base Method

    #region Ptz Method

    private static class GPIParams
    {
        public static int Size { get; private set; }
        public static Type Type { get; private set; }

        static GPIParams()
        {
            HiKOriSdk.NET_DVR_PTZPOS ptzPos = new();
            Size = Marshal.SizeOf(ptzPos);
            Type = ptzPos.GetType();
        }
    }

    public override PtzInfo GetPtzInfo()
    {
        bool ret = ConnectSuccess();
        if (!ret) return PtzInfo.Default;

        HiKOriSdk.NET_DVR_PTZPOS entity = new();
        int dwSize = GPIParams.Size;
        uint dwReturned = 0;
        IntPtr ptrBuf = Marshal.AllocHGlobal(dwSize);
        Marshal.StructureToPtr(entity, ptrBuf, true);
        try
        {
            ret = HiKOriSdk.NET_DVR_GetDVRConfig(LoginId, HiKOriSdk.NET_DVR_GET_PTZPOS, 0, ptrBuf, (uint)dwSize, ref dwReturned);
            if (!ret) { BuildException(); return PtzInfo.Default; }
            object? objBuf = Marshal.PtrToStructure(ptrBuf, GPIParams.Type);
            if (objBuf == null) return PtzInfo.Default;
            entity = (HiKOriSdk.NET_DVR_PTZPOS)objBuf;
            return PtzInfo.New(entity.wPanPos, entity.wTiltPos, entity.wZoomPos);
        }
        finally
        {
            Marshal.FreeHGlobal(ptrBuf);
        }
    }

    public override bool TryGetPtzInfo(out PtzInfo ptzInfo)
    {
        bool ret = ConnectSuccess();
        if (!ret) { ptzInfo = PtzInfo.Default; return false; }

        HiKOriSdk.NET_DVR_PTZPOS entity = new();
        int dwSize = GPIParams.Size;
        uint dwReturned = 0;
        IntPtr ptrBuf = Marshal.AllocHGlobal(dwSize);
        Marshal.StructureToPtr(entity, ptrBuf, true);
        try
        {
            ret = HiKOriSdk.NET_DVR_GetDVRConfig(LoginId, HiKOriSdk.NET_DVR_GET_PTZPOS, 0, ptrBuf, (uint)dwSize, ref dwReturned);
            if (!ret) { BuildException(); ptzInfo = PtzInfo.Default; return false; }
            object? objBuf = Marshal.PtrToStructure(ptrBuf, GPIParams.Type);
            if (objBuf == null) { ptzInfo = PtzInfo.Default; return false; }
            entity = (HiKOriSdk.NET_DVR_PTZPOS)objBuf;
            ptzInfo = PtzInfo.New(entity.wPanPos, entity.wTiltPos, entity.wZoomPos);
            return true;
        }
        finally
        {
            Marshal.FreeHGlobal(ptrBuf);
        }
    }

    public override bool PtzMove(int cmd, int stop, int speed)
    {
        if (!ConnectSuccess()) return false;
        bool ret = HiKOriSdk.NET_DVR_PTZControlWithSpeed_Other(LoginId, Channel, (uint)cmd, (uint)stop, (uint)speed);
        if (!ret) BuildException();
        return ret;
    }

    public override bool PtzPreset(int cmd, int presetId)
    {
        if (!ConnectSuccess()) return false;
        bool ret = HiKOriSdk.NET_DVR_PTZPreset_Other(LoginId, Channel, (uint)cmd, (uint)presetId);
        if (!ret) BuildException();
        return ret;
    }

    #endregion Ptz Method

    #region Video Method

    private int RealplayHandle { get; set; } = -1;

    private int RealpalyPort { get; set; } = -1;

    private IntPtr Hwnd { get; set; }

    public override void StartPlay(IntPtr hwnd)
    {
        if (!ConnectSuccess() || IsPlaying()) return;
        Hwnd = hwnd;
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) StartPlayWindows();
        else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux)) StartPlayLinux();
        else Hwnd = IntPtr.Zero;
    }

    private void StartPlayWindows()
    {
        HiKOriSdk.NET_DVR_PREVIEWINFO previewInfo = new()
        {
            hPlayWnd = Hwnd, //预览窗口
            lChannel = 1, //预览的设备通道
            dwStreamType = 0, //码流类型：0-主码流，1-子码流，2-码流3，3-码流4，以此类推
            dwLinkMode = 0, //连接方式：0- TCP方式，1- UDP方式，2- 多播方式，3- RTP方式，4-RTP/RTSP，5-RSTP/HTTP
            bBlocked = true, //0- 非阻塞取流，1- 阻塞取流
        };
        IntPtr pUser = new(); //用户数据
        RealplayHandle = HiKOriSdk.NET_DVR_RealPlay_V40(LoginId, ref previewInfo, null, pUser);
        if (RealplayHandle < 0) BuildException();
    }

    private void StartPlayLinux()
    {
        if (RealpalyPort < 0)
        {
            int nPort = -1;
            bool ret = PlayCtrlSdk.PlayM4_GetPort(ref nPort);
            if (!ret) BuildPlayCtrlException(nPort);
            RealpalyPort = nPort;
        }
        HiKOriSdk.NET_DVR_PREVIEWINFO previewInfo = new()
        {
            hPlayWnd = IntPtr.Zero, //预览窗口
            lChannel = 1, //预览的设备通道
            dwStreamType = 0, //码流类型：0-主码流，1-子码流，2-码流3，3-码流4，以此类推
            dwLinkMode = 0, //连接方式：0- TCP方式，1- UDP方式，2- 多播方式，3- RTP方式，4-RTP/RTSP，5-RSTP/HTTP
            bBlocked = true, //0- 非阻塞取流，1- 阻塞取流
        };
        RealplayHandle = HiKOriSdk.NET_DVR_RealPlay_V40(LoginId, ref previewInfo, RealDataCallBack, IntPtr.Zero);
        if (RealplayHandle < 0) BuildException();
    }

    private void RealDataCallBack(int lRealHandle, uint dwDataType, IntPtr pBuffer, uint dwBufSize, IntPtr pUser)
    {
        if (dwBufSize <= 0) return;
        switch (dwDataType)
        {
            case HiKOriSdk.NET_DVR_SYSHEAD:
                try
                {
                    PlayCtrlSdk.PlayM4_SetStreamOpenMode(RealpalyPort, 0);
                    PlayCtrlSdk.PlayM4_OpenStream(RealpalyPort, pBuffer, dwBufSize, 2 * 1024 * 1024);
                    if (!PlayCtrlSdk.PlayM4_Play(RealpalyPort, Hwnd)) BuildPlayCtrlException(RealpalyPort);
                }
                catch (Exception)
                {
                    StopPlay();
                    throw;
                }
                break;

            case HiKOriSdk.NET_DVR_STREAMDATA:
                PlayCtrlSdk.PlayM4_InputData(RealpalyPort, pBuffer, dwBufSize);
                break;
        }
    }

    public override void StopPlay()
    {
        if (!IsPlaying()) return;
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) StopPlayWindows();
        else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux)) StopPlayLinux();
        Hwnd = IntPtr.Zero;
    }

    public void StopPlayWindows()
    {
        bool ret = HiKOriSdk.NET_DVR_StopRealPlay(RealplayHandle);
        RealplayHandle = -1;
        if (!ret) BuildException();
    }

    public void StopPlayLinux()
    {
        bool ret = HiKOriSdk.NET_DVR_StopRealPlay(RealplayHandle);
        RealplayHandle = -1;
        if (RealpalyPort >= 0)
        {
            //if(!PlayCtrlSdk.PlayM4_Stop(RealpalyPort)) BuildPlayCtrlException(RealpalyPort);
            PlayCtrlSdk.PlayM4_Stop(RealpalyPort);
            PlayCtrlSdk.PlayM4_CloseStream(RealpalyPort);
            PlayCtrlSdk.PlayM4_FreePort(RealpalyPort);
            RealpalyPort = -1;
        }
        if (!ret) BuildException();
    }

    public override bool IsPlaying()
    {
        return RealplayHandle >= 0;
    }

    #endregion Video Method
}