using System.Runtime.InteropServices;

namespace EC.Util.CameraSDK;

public class HiKSDK : ICameraSDK
{
    #region Fields

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

    private int RealplayHandle { get; set; } = -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_DEVICEINFO_V30 deviceInfo = new();
        LoginId = HiKOriSDK.NET_DVR_Login_V30(CameraInfo.Ip, CameraInfo.Port, CameraInfo.UserName, CameraInfo.Password, ref deviceInfo);
        ret = ConnectSuccess();

        return ret;
    }

    public override bool Destory()
    {
        bool ret = ConnectSuccess();
        if (!ret) return true;

        ret = HiKOriSDK.NET_DVR_Logout(LoginId);
        if (ret) LoginId = -1;

        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);
    }

    #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;
        int lChannel = 1;
        bool flag = HiKOriSDK.NET_DVR_PTZControlWithSpeed_Other(LoginId, lChannel, (uint)cmd, (uint)stop, (uint)speed);
        if (flag) BuildException();
        return flag;
    }

    public override bool PtzPreset(int cmd, int presetId)
    {
        if (!ConnectSuccess()) return false;
        int lChannel = 1;
        bool flag = HiKOriSDK.NET_DVR_PTZPreset_Other(LoginId, lChannel, (uint)cmd, (uint)presetId);
        if (flag) BuildException();
        return flag;
    }

    #endregion Ptz Method

    #region Video Method

    public override void StartPlay(IntPtr hwnd)
    {
        if (!ConnectSuccess() || IsPlaying()) return;
        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
            dwDisplayBufNum = 1, //播放库播放缓冲区最大缓冲帧数
            byProtoType = 0,
            byPreviewMode = 0
        };
        IntPtr pUser = new(); //用户数据
        RealplayHandle = HiKOriSDK.NET_DVR_RealPlay_V40(LoginId, ref previewInfo, null, pUser);
        if (RealplayHandle < 0) BuildException();
    }

    public override void StopPlay()
    {
        if (!IsPlaying()) return;
        bool flag = HiKOriSDK.NET_DVR_StopRealPlay(RealplayHandle);
        RealplayHandle = -1;
        if (!flag) BuildException();
    }

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

    #endregion Video Method
}