#region Imports

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Security;

#endregion

namespace DPumpHydr.WinFrmUI.RLT.Native
{
    #region DwmApiNative

    [SuppressUnmanagedCodeSecurity]
    internal class DwmApi
    {
        #region Structs

        [StructLayout(LayoutKind.Explicit)]
        public struct RECT
        {
            [FieldOffset(12)]
            public int bottom;
            [FieldOffset(0)]
            public int left;
            [FieldOffset(8)]
            public int right;
            [FieldOffset(4)]
            public int top;

            public RECT(Rectangle rect)
            {
                left = rect.Left;
                top = rect.Top;
                right = rect.Right;
                bottom = rect.Bottom;
            }

            public RECT(int leftt, int topp, int rightt, int bottomm)
            {
                left = leftt;
                top = topp;
                right = rightt;
                bottom = bottomm;
            }

            public void Set()
            {
                left = InlineAssignHelper(ref top, InlineAssignHelper(ref right, InlineAssignHelper(ref bottom, 0)));
            }

            public void Set(Rectangle rect)
            {
                left = rect.Left;
                top = rect.Top;
                right = rect.Right;
                bottom = rect.Bottom;
            }

            public void Set(int leftt, int topp, int rightt, int bottomm)
            {
                left = leftt;
                top = topp;
                right = rightt;
                bottom = bottomm;
            }

            public Rectangle ToRectangle()
            {
                return new Rectangle(left, top, right - left, bottom - top);
            }

            public int Height => bottom - top;

            public Size Size => new(Width, Height);

            public int Width => right - left;
            private static T InlineAssignHelper<T>(ref T target, T value)
            {
                target = value;
                return value;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DWM_BLURBEHIND
        {
            public int dwFlags;
            public int fEnable;
            public IntPtr hRgnBlur;
            public int fTransitionOnMaximized;

            private DWM_BLURBEHIND(bool enable)
            {
                dwFlags = DWM_BB_ENABLE;
                fEnable = enable ? 1 : 0;
                hRgnBlur = IntPtr.Zero;
                fTransitionOnMaximized = 0;
            }

            public static DWM_BLURBEHIND Enable = new(true);
            public static DWM_BLURBEHIND Disable = new(false);

            public const int DWM_BB_ENABLE = 1;
            public const int DWM_BB_BLURREGION = 2;
            public const int DWM_BB_TRANSITIONONMAXIMIZED = 4;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DWM_PRESENT_PARAMETERS
        {
            public int cbSize;
            public int fQueue;
            public long cRefreshStart;
            public int cBuffer;
            public int fUseSourceRate;
            public UNSIGNED_RATIO rateSource;
            public int cRefreshesPerFrame;
            public DWM_SOURCE_FRAME_SAMPLING eSampling;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DWM_THUMBNAIL_PROPERTIES
        {
            public int dwFlags;
            public RECT rcDestination;
            public RECT rcSource;
            public byte opacity;
            public int fVisible;
            public int fSourceClientAreaOnly;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DWM_TIMING_INFO
        {
            public int cbSize;
            public UNSIGNED_RATIO rateRefresh;
            public UNSIGNED_RATIO rateCompose;
            public long qpcVBlank;
            public long cRefresh;
            public long qpcCompose;
            public long cFrame;
            public long cRefreshFrame;
            public long cRefreshConfirmed;
            public int cFlipsOutstanding;
            public long cFrameCurrent;
            public long cFramesAvailable;
            public long cFrameCleared;
            public long cFramesReceived;
            public long cFramesDisplayed;
            public long cFramesDropped;
            public long cFramesMissed;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct UNSIGNED_RATIO
        {
            public int uiNumerator;
            public int uiDenominator;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MARGINS
        {
            public int cxLeftWidth;
            public int cxRightWidth;
            public int cyTopHeight;
            public int cyBottomHeight;
            public MARGINS(int Left, int Right, int Top, int Bottom)
            {
                cxLeftWidth = Left;
                cxRightWidth = Right;
                cyTopHeight = Top;
                cyBottomHeight = Bottom;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct WTA_OPTIONS
        {
            public uint Flags;
            public uint Mask;
        }

        #endregion

        #region Enums

        public enum DWM_SOURCE_FRAME_SAMPLING
        {
            POINT,
            COVERAGE,
            LAST
        }

        public enum DWMNCRENDERINGPOLICY
        {
            DWMNCRP_USEWINDOWSTYLE,
            DWMNCRP_DISABLED,
            DWMNCRP_ENABLED
        }

        public enum DWMWINDOWATTRIBUTE
        {
            DWMWA_ALLOW_NCPAINT = 4,
            DWMWA_CAPTION_BUTTON_BOUNDS = 5,
            DWMWA_FLIP3D_POLICY = 8,
            DWMWA_FORCE_ICONIC_REPRESENTATION = 7,
            DWMWA_LAST = 9,
            DWMWA_NCRENDERING_ENABLED = 1,
            DWMWA_NCRENDERING_POLICY = 2,
            DWMWA_NONCLIENT_RTL_LAYOUT = 6,
            DWMWA_TRANSITIONS_FORCEDISABLED = 3
        }

        public enum WindowThemeAttributeType
        {
            WTA_NONCLIENT = 1
        }

        #endregion

        #region Fields

        public static uint WTNCA_NODRAWCAPTION = 0x1;
        public static uint WTNCA_NODRAWICON = 0x2;
        public static uint WTNCA_NOSYSMENU = 0x4;
        public static uint WTNCA_NOMIRRORHELP = 0x8;

        public const int DWM_BB_BLURREGION = 2;
        public const int DWM_BB_ENABLE = 1;
        public const int DWM_BB_TRANSITIONONMAXIMIZED = 4;
        public const string DWM_COMPOSED_EVENT_BASE_NAME = "DwmComposedEvent_";
        public const string DWM_COMPOSED_EVENT_NAME_FORMAT = "%s%d";
        public const int DWM_COMPOSED_EVENT_NAME_MAX_LENGTH = 0x40;
        public const int DWM_FRAME_DURATION_DEFAULT = -1;
        public const int DWM_TNP_OPACITY = 4;
        public const int DWM_TNP_RECTDESTINATION = 1;
        public const int DWM_TNP_RECTSOURCE = 2;
        public const int DWM_TNP_SOURCECLIENTAREAONLY = 0x10;
        public const int DWM_TNP_VISIBLE = 8;
        public static readonly bool DwmApiAvailable = Environment.OSVersion.Version.Major >= 6;

        public const int WM_DWMCOMPOSITIONCHANGED = 0x31e;

        #endregion

        #region API Calls

        [DllImport("dwmapi.dll")]
        public static extern int DwmDefWindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref IntPtr result);
        [DllImport("dwmapi.dll")]
        public static extern int DwmEnableComposition(int fEnable);
        [DllImport("dwmapi.dll")]
        public static extern int DwmEnableMMCSS(int fEnableMMCSS);
        [DllImport("dwmapi.dll")]
        public static extern int DwmExtendFrameIntoClientArea(IntPtr hdc, ref MARGINS marInset);
        [DllImport("dwmapi.dll")]
        public static extern int DwmGetColorizationColor(ref int pcrColorization, ref int pfOpaqueBlend);
        [DllImport("dwmapi.dll")]
        public static extern int DwmGetCompositionTimingInfo(IntPtr hwnd, ref DWM_TIMING_INFO pTimingInfo);
        [DllImport("dwmapi.dll")]
        public static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, IntPtr pvAttribute, int cbAttribute);
        [DllImport("dwmapi.dll")]
        public static extern int DwmIsCompositionEnabled(ref int pfEnabled);
        [DllImport("dwmapi.dll")]
        public static extern int DwmIsCompositionEnabled(out bool pfEnabled);
        [DllImport("dwmapi.dll")]
        public static extern int DwmModifyPreviousDxFrameDuration(IntPtr hwnd, int cRefreshes, int fRelative);
        [DllImport("dwmapi.dll")]
        public static extern int DwmQueryThumbnailSourceSize(IntPtr hThumbnail, ref Size pSize);
        [DllImport("dwmapi.dll")]
        public static extern int DwmRegisterThumbnail(IntPtr hwndDestination, IntPtr hwndSource, ref Size pMinimizedSize, ref IntPtr phThumbnailId);
        [DllImport("dwmapi.dll")]
        public static extern int DwmSetDxFrameDuration(IntPtr hwnd, int cRefreshes);
        [DllImport("dwmapi.dll")]
        public static extern int DwmSetPresentParameters(IntPtr hwnd, ref DWM_PRESENT_PARAMETERS pPresentParams);
        [DllImport("dwmapi.dll")]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int dwAttribute, IntPtr pvAttribute, int cbAttribute);
        [DllImport("dwmapi.dll", PreserveSig = true)]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
        [DllImport("dwmapi.dll")]
        public static extern int DwmUnregisterThumbnail(IntPtr hThumbnailId);
        [DllImport("dwmapi.dll")]
        public static extern int DwmUpdateThumbnailProperties(IntPtr hThumbnailId, ref DWM_THUMBNAIL_PROPERTIES ptnProperties);

        [DllImport("dwmapi.dll")]
        public static extern int DwmEnableBlurBehindWindow(IntPtr hWnd, ref DWM_BLURBEHIND pBlurBehind);

        [DllImport("uxtheme.dll")]
        public static extern int SetWindowThemeAttribute(IntPtr hWnd, WindowThemeAttributeType wtype, ref WTA_OPTIONS attributes, uint size);

        #endregion
    }

    #endregion
}