using System.ComponentModel;
using System.Runtime.InteropServices;

namespace GHelper.Display
{
    public class ScreenCCD
    {

        public static bool GetHDRStatus()
        {
            var err = GetDisplayConfigBufferSizes(QDC.QDC_ONLY_ACTIVE_PATHS, out var pathCount, out var modeCount);
            if (err != 0)
                throw new Win32Exception(err);

            var paths = new DISPLAYCONFIG_PATH_INFO[pathCount];
            var modes = new DISPLAYCONFIG_MODE_INFO[modeCount];
            err = QueryDisplayConfig(QDC.QDC_ONLY_ACTIVE_PATHS, ref pathCount, paths, ref modeCount, modes, IntPtr.Zero);
            if (err != 0)
                throw new Win32Exception(err);

            string internalName = AppConfig.GetString("internal_display");

            foreach (var path in paths)
            {
                // get display name
                var info = new DISPLAYCONFIG_TARGET_DEVICE_NAME();
                info.header.type = DISPLAYCONFIG_DEVICE_INFO_TYPE.DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME;
                info.header.size = Marshal.SizeOf<DISPLAYCONFIG_TARGET_DEVICE_NAME>();
                info.header.adapterId = path.targetInfo.adapterId;
                info.header.id = path.targetInfo.id;
                err = DisplayConfigGetDeviceInfo(ref info);
                if (err != 0)
                    throw new Win32Exception(err);

                var colorInfo = new DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO();
                colorInfo.header.type = DISPLAYCONFIG_DEVICE_INFO_TYPE.DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO;
                colorInfo.header.size = Marshal.SizeOf<DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO>();
                colorInfo.header.adapterId = path.targetInfo.adapterId;
                colorInfo.header.id = path.targetInfo.id;
                err = DisplayConfigGetDeviceInfo(ref colorInfo);
                if (err != 0)
                    throw new Win32Exception(err);


                if (info.outputTechnology == DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY.DISPLAYCONFIG_OUTPUT_TECHNOLOGY_INTERNAL ||
                    info.outputTechnology == DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY.DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EMBEDDED ||
                    info.monitorFriendlyDeviceName == internalName)
                {
                    Logger.WriteLine(info.monitorFriendlyDeviceName + " HDR: " + colorInfo.advancedColorEnabled);
                    return colorInfo.advancedColorEnabled;
                }

            }

            return false;

        }

        private enum DISPLAYCONFIG_DEVICE_INFO_TYPE
        {
            DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME = 1,
            DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME = 2,
            DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_PREFERRED_MODE = 3,
            DISPLAYCONFIG_DEVICE_INFO_GET_ADAPTER_NAME = 4,
            DISPLAYCONFIG_DEVICE_INFO_SET_TARGET_PERSISTENCE = 5,
            DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_BASE_TYPE = 6,
            DISPLAYCONFIG_DEVICE_INFO_GET_SUPPORT_VIRTUAL_RESOLUTION = 7,
            DISPLAYCONFIG_DEVICE_INFO_SET_SUPPORT_VIRTUAL_RESOLUTION = 8,
            DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO = 9,
            DISPLAYCONFIG_DEVICE_INFO_SET_ADVANCED_COLOR_STATE = 10,
            DISPLAYCONFIG_DEVICE_INFO_GET_SDR_WHITE_LEVEL = 11,
        }

        private enum DISPLAYCONFIG_COLOR_ENCODING
        {
            DISPLAYCONFIG_COLOR_ENCODING_RGB = 0,
            DISPLAYCONFIG_COLOR_ENCODING_YCBCR444 = 1,
            DISPLAYCONFIG_COLOR_ENCODING_YCBCR422 = 2,
            DISPLAYCONFIG_COLOR_ENCODING_YCBCR420 = 3,
            DISPLAYCONFIG_COLOR_ENCODING_INTENSITY = 4,
        }

        private enum DISPLAYCONFIG_SCALING
        {
            DISPLAYCONFIG_SCALING_IDENTITY = 1,
            DISPLAYCONFIG_SCALING_CENTERED = 2,
            DISPLAYCONFIG_SCALING_STRETCHED = 3,
            DISPLAYCONFIG_SCALING_ASPECTRATIOCENTEREDMAX = 4,
            DISPLAYCONFIG_SCALING_CUSTOM = 5,
            DISPLAYCONFIG_SCALING_PREFERRED = 128,
        }

        private enum DISPLAYCONFIG_ROTATION
        {
            DISPLAYCONFIG_ROTATION_IDENTITY = 1,
            DISPLAYCONFIG_ROTATION_ROTATE90 = 2,
            DISPLAYCONFIG_ROTATION_ROTATE180 = 3,
        }

        private enum DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY
        {
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_OTHER = -1,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_HD15 = 0,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SVIDEO = 1,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_COMPOSITE_VIDEO = 2,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_COMPONENT_VIDEO = 3,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DVI = 4,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_HDMI = 5,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_LVDS = 6,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_D_JPN = 8,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SDI = 9,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EXTERNAL = 10,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EMBEDDED = 11,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_UDI_EXTERNAL = 12,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_UDI_EMBEDDED = 13,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SDTVDONGLE = 14,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_MIRACAST = 15,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_INDIRECT_WIRED = 16,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_INDIRECT_VIRTUAL = 17,
            DISPLAYCONFIG_OUTPUT_TECHNOLOGY_INTERNAL = unchecked((int)0x80000000),
        }

        private enum DISPLAYCONFIG_TOPOLOGY_ID
        {
            DISPLAYCONFIG_TOPOLOGY_INTERNAL = 0x00000001,
            DISPLAYCONFIG_TOPOLOGY_CLONE = 0x00000002,
            DISPLAYCONFIG_TOPOLOGY_EXTEND = 0x00000004,
            DISPLAYCONFIG_TOPOLOGY_EXTERNAL = 0x00000008,
        }

        private enum DISPLAYCONFIG_PATH
        {
            DISPLAYCONFIG_PATH_ACTIVE = 0x00000001,
            DISPLAYCONFIG_PATH_PREFERRED_UNSCALED = 0x00000004,
            DISPLAYCONFIG_PATH_SUPPORT_VIRTUAL_MODE = 0x00000008,
        }

        private enum DISPLAYCONFIG_SOURCE_FLAGS
        {
            DISPLAYCONFIG_SOURCE_IN_USE = 0x00000001,
        }

        private enum DISPLAYCONFIG_TARGET_FLAGS
        {
            DISPLAYCONFIG_TARGET_IN_USE = 0x00000001,
            DISPLAYCONFIG_TARGET_FORCIBLE = 0x00000002,
            DISPLAYCONFIG_TARGET_FORCED_AVAILABILITY_BOOT = 0x00000004,
            DISPLAYCONFIG_TARGET_FORCED_AVAILABILITY_PATH = 0x00000008,
            DISPLAYCONFIG_TARGET_FORCED_AVAILABILITY_SYSTEM = 0x00000010,
            DISPLAYCONFIG_TARGET_IS_HMD = 0x00000020,
        }

        private enum QDC
        {
            QDC_ALL_PATHS = 0x00000001,
            QDC_ONLY_ACTIVE_PATHS = 0x00000002,
            QDC_DATABASE_CURRENT = 0x00000004,
            QDC_VIRTUAL_MODE_AWARE = 0x00000010,
            QDC_INCLUDE_HMD = 0x00000020,
        }

        private enum DISPLAYCONFIG_SCANLINE_ORDERING
        {
            DISPLAYCONFIG_SCANLINE_ORDERING_UNSPECIFIED = 0,
            DISPLAYCONFIG_SCANLINE_ORDERING_PROGRESSIVE = 1,
            DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED = 2,
            DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED_UPPERFIELDFIRST = DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED,
            DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED_LOWERFIELDFIRST = 3,
        }

        private enum DISPLAYCONFIG_PIXELFORMAT
        {
            DISPLAYCONFIG_PIXELFORMAT_8BPP = 1,
            DISPLAYCONFIG_PIXELFORMAT_16BPP = 2,
            DISPLAYCONFIG_PIXELFORMAT_24BPP = 3,
            DISPLAYCONFIG_PIXELFORMAT_32BPP = 4,
            DISPLAYCONFIG_PIXELFORMAT_NONGDI = 5,
        }

        private enum DISPLAYCONFIG_MODE_INFO_TYPE
        {
            DISPLAYCONFIG_MODE_INFO_TYPE_SOURCE = 1,
            DISPLAYCONFIG_MODE_INFO_TYPE_TARGET = 2,
            DISPLAYCONFIG_MODE_INFO_TYPE_DESKTOP_IMAGE = 3,
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_DEVICE_INFO_HEADER
        {
            public DISPLAYCONFIG_DEVICE_INFO_TYPE type;
            public int size;
            public LUID adapterId;
            public uint id;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO
        {
            public DISPLAYCONFIG_DEVICE_INFO_HEADER header;
            public uint value;
            public DISPLAYCONFIG_COLOR_ENCODING colorEncoding;
            public int bitsPerColorChannel;

            public bool advancedColorSupported => (value & 0x1) == 0x1;
            public bool advancedColorEnabled => (value & 0x2) == 0x2;
            public bool wideColorEnforced => (value & 0x4) == 0x4;
            public bool advancedColorForceDisabled => (value & 0x8) == 0x8;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct POINTL
        {
            public int x;
            public int y;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct LUID
        {
            public uint LowPart;
            public int HighPart;

            public long Value => ((long)HighPart << 32) | LowPart;
            public override string ToString() => Value.ToString();
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_SOURCE_MODE
        {
            public uint width;
            public uint height;
            public DISPLAYCONFIG_PIXELFORMAT pixelFormat;
            public POINTL position;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_RATIONAL
        {
            public uint Numerator;
            public uint Denominator;

            public override string ToString() => Numerator + " / " + Denominator;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_2DREGION
        {
            public uint cx;
            public uint cy;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_DESKTOP_IMAGE_INFO
        {
            public POINTL PathSourceSize;
            public RECT DesktopImageRegion;
            public RECT DesktopImageClip;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_VIDEO_SIGNAL_INFO
        {
            public ulong pixelRate;
            public DISPLAYCONFIG_RATIONAL hSyncFreq;
            public DISPLAYCONFIG_RATIONAL vSyncFreq;
            public DISPLAYCONFIG_2DREGION activeSize;
            public DISPLAYCONFIG_2DREGION totalSize;
            public uint videoStandard;
            public DISPLAYCONFIG_SCANLINE_ORDERING scanLineOrdering;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_TARGET_MODE
        {
            public DISPLAYCONFIG_VIDEO_SIGNAL_INFO targetVideoSignalInfo;
        }

        [StructLayout(LayoutKind.Explicit)]
        private struct DISPLAYCONFIG_MODE_INFO_union
        {
            [FieldOffset(0)]
            public DISPLAYCONFIG_TARGET_MODE targetMode;

            [FieldOffset(0)]
            public DISPLAYCONFIG_SOURCE_MODE sourceMode;

            [FieldOffset(0)]
            public DISPLAYCONFIG_DESKTOP_IMAGE_INFO desktopImageInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_PATH_SOURCE_INFO
        {
            public LUID adapterId;
            public uint id;
            public uint modeInfoIdx;
            public DISPLAYCONFIG_SOURCE_FLAGS statusFlags;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_PATH_TARGET_INFO
        {
            public LUID adapterId;
            public uint id;
            public uint modeInfoIdx;
            public DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY outputTechnology;
            public DISPLAYCONFIG_ROTATION rotation;
            public DISPLAYCONFIG_SCALING scaling;
            public DISPLAYCONFIG_RATIONAL refreshRate;
            public DISPLAYCONFIG_SCANLINE_ORDERING scanLineOrdering;
            public bool targetAvailable;
            public DISPLAYCONFIG_TARGET_FLAGS statusFlags;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_PATH_INFO
        {
            public DISPLAYCONFIG_PATH_SOURCE_INFO sourceInfo;
            public DISPLAYCONFIG_PATH_TARGET_INFO targetInfo;
            public DISPLAYCONFIG_PATH flags;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct DISPLAYCONFIG_MODE_INFO
        {
            public DISPLAYCONFIG_MODE_INFO_TYPE infoType;
            public uint id;
            public LUID adapterId;
            public DISPLAYCONFIG_MODE_INFO_union info;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct DISPLAYCONFIG_SOURCE_DEVICE_NAME
        {
            public DISPLAYCONFIG_DEVICE_INFO_HEADER header;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string viewGdiDeviceName;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct DISPLAYCONFIG_TARGET_DEVICE_NAME_FLAGS
        {
            public uint value;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct DISPLAYCONFIG_TARGET_DEVICE_NAME
        {
            public DISPLAYCONFIG_DEVICE_INFO_HEADER header;
            public DISPLAYCONFIG_TARGET_DEVICE_NAME_FLAGS flags;
            public DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY outputTechnology;
            public ushort edidManufactureId;
            public ushort edidProductCodeId;
            public uint connectorInstance;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
            public string monitorFriendlyDeviceName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string monitorDevicePat;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }

        [DllImport("user32")]
        private static extern int GetDisplayConfigBufferSizes(QDC flags, out int numPathArrayElements, out int numModeInfoArrayElements);

        [DllImport("user32")]
        private static extern int QueryDisplayConfig(QDC flags, ref int numPathArrayElements, [In, Out] DISPLAYCONFIG_PATH_INFO[] pathArray, ref int numModeInfoArrayElements, [In, Out] DISPLAYCONFIG_MODE_INFO[] modeInfoArray, out DISPLAYCONFIG_TOPOLOGY_ID currentTopologyId);

        [DllImport("user32")]
        private static extern int QueryDisplayConfig(QDC flags, ref int numPathArrayElements, [In, Out] DISPLAYCONFIG_PATH_INFO[] pathArray, ref int numModeInfoArrayElements, [In, Out] DISPLAYCONFIG_MODE_INFO[] modeInfoArray, IntPtr currentTopologyId);

        [DllImport("user32")]
        private static extern int DisplayConfigGetDeviceInfo(ref DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO requestPacket);

        [DllImport("user32")]
        private static extern int DisplayConfigGetDeviceInfo(ref DISPLAYCONFIG_SOURCE_DEVICE_NAME requestPacket);

        [DllImport("user32")]
        private static extern int DisplayConfigGetDeviceInfo(ref DISPLAYCONFIG_TARGET_DEVICE_NAME requestPacket);
    }
}
