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

namespace PreviewToy
{
    // Desktop Windows Manager APIs
    internal class DwmApi
    {

        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        public static extern bool SetForegroundWindow(IntPtr window);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmEnableBlurBehindWindow(IntPtr hWnd, DWM_BLURBEHIND pBlurBehind);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmExtendFrameIntoClientArea(IntPtr hWnd, MARGINS pMargins);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern bool DwmIsCompositionEnabled();

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmGetColorizationColor(
            out int pcrColorization,
            [MarshalAs(UnmanagedType.Bool)]out bool pfOpaqueBlend);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmEnableComposition(bool bEnable);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern IntPtr DwmRegisterThumbnail(IntPtr dest, IntPtr source);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmUnregisterThumbnail(IntPtr hThumbnail);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmUpdateThumbnailProperties(IntPtr hThumbnail, DWM_THUMBNAIL_PROPERTIES props);

        [DllImport("dwmapi.dll", PreserveSig = false)]
        public static extern void DwmQueryThumbnailSourceSize(IntPtr hThumbnail, out Size size);

        [StructLayout(LayoutKind.Sequential)]
        public class DWM_THUMBNAIL_PROPERTIES
        {
            public uint dwFlags;
            public RECT rcDestination;
            public RECT rcSource;
            public byte opacity;
            [MarshalAs(UnmanagedType.Bool)]
            public bool fVisible;
            [MarshalAs(UnmanagedType.Bool)]
            public bool fSourceClientAreaOnly;

            public const uint DWM_TNP_RECTDESTINATION = 0x00000001;
            public const uint DWM_TNP_RECTSOURCE = 0x00000002;
            public const uint DWM_TNP_OPACITY = 0x00000004;
            public const uint DWM_TNP_VISIBLE = 0x00000008;
            public const uint DWM_TNP_SOURCECLIENTAREAONLY = 0x00000010;
        }

        [StructLayout(LayoutKind.Sequential)]
        public class MARGINS
        {
            public int cxLeftWidth, cxRightWidth, cyTopHeight, cyBottomHeight;

            public MARGINS(int left, int top, int right, int bottom)
            {
                cxLeftWidth = left; cyTopHeight = top;
                cxRightWidth = right; cyBottomHeight = bottom;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public class DWM_BLURBEHIND
        {
            public uint dwFlags;
            [MarshalAs(UnmanagedType.Bool)]
            public bool fEnable;
            public IntPtr hRegionBlur;
            [MarshalAs(UnmanagedType.Bool)]
            public bool fTransitionOnMaximized;

            public const uint DWM_BB_ENABLE = 0x00000001;
            public const uint DWM_BB_BLURREGION = 0x00000002;
            public const uint DWM_BB_TRANSITIONONMAXIMIZED = 0x00000004;
        }

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

            public RECT(int left, int top, int right, int bottom)
            {
                this.left = left; this.top = top; this.right = right; this.bottom = bottom;
            }
        }

        public const int SW_SHOWNORMAL = 1;
        public const int SW_SHOWMINIMIZED = 2;
        public const int SW_SHOWMAXIMIZED = 3;

        [DllImport("user32.dll")]
        public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

        public const int GWL_ID = (-12);
        public const int GWL_STYLE = (-16);
        public const int GWL_EXSTYLE = (-20);

        // Window Styles 
        public const UInt32 WS_OVERLAPPED = 0;
        public const UInt32 WS_POPUP = 0x80000000;
        public const UInt32 WS_CHILD = 0x40000000;
        public const UInt32 WS_MINIMIZE = 0x20000000;
        public const UInt32 WS_VISIBLE = 0x10000000;
        public const UInt32 WS_DISABLED = 0x8000000;
        public const UInt32 WS_CLIPSIBLINGS = 0x4000000;
        public const UInt32 WS_CLIPCHILDREN = 0x2000000;
        public const UInt32 WS_MAXIMIZE = 0x1000000;
        public const UInt32 WS_CAPTION = 0xC00000;      // WS_BORDER or WS_DLGFRAME  
        public const UInt32 WS_BORDER = 0x800000;
        public const UInt32 WS_DLGFRAME = 0x400000;
        public const UInt32 WS_VSCROLL = 0x200000;
        public const UInt32 WS_HSCROLL = 0x100000;
        public const UInt32 WS_SYSMENU = 0x80000;
        public const UInt32 WS_THICKFRAME = 0x40000;
        public const UInt32 WS_GROUP = 0x20000;
        public const UInt32 WS_TABSTOP = 0x10000;
        public const UInt32 WS_MINIMIZEBOX = 0x20000;
        public const UInt32 WS_MAXIMIZEBOX = 0x10000;
        public const UInt32 WS_TILED = WS_OVERLAPPED;
        public const UInt32 WS_ICONIC = WS_MINIMIZE;
        public const UInt32 WS_SIZEBOX = WS_THICKFRAME;

        // Extended Window Styles 
        public const UInt32 WS_EX_DLGMODALFRAME = 0x0001;
        public const UInt32 WS_EX_NOPARENTNOTIFY = 0x0004;
        public const UInt32 WS_EX_TOPMOST = 0x0008;
        public const UInt32 WS_EX_ACCEPTFILES = 0x0010;
        public const UInt32 WS_EX_TRANSPARENT = 0x0020;
        public const UInt32 WS_EX_MDICHILD = 0x0040;
        public const UInt32 WS_EX_TOOLWINDOW = 0x0080;
        public const UInt32 WS_EX_WINDOWEDGE = 0x0100;
        public const UInt32 WS_EX_CLIENTEDGE = 0x0200;
        public const UInt32 WS_EX_CONTEXTHELP = 0x0400;
        public const UInt32 WS_EX_RIGHT = 0x1000;
        public const UInt32 WS_EX_LEFT = 0x0000;
        public const UInt32 WS_EX_RTLREADING = 0x2000;
        public const UInt32 WS_EX_LTRREADING = 0x0000;
        public const UInt32 WS_EX_LEFTSCROLLBAR = 0x4000;
        public const UInt32 WS_EX_RIGHTSCROLLBAR = 0x0000;
        public const UInt32 WS_EX_CONTROLPARENT = 0x10000;
        public const UInt32 WS_EX_STATICEDGE = 0x20000;
        public const UInt32 WS_EX_APPWINDOW = 0x40000;
        public const UInt32 WS_EX_OVERLAPPEDWINDOW = (WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE);
        public const UInt32 WS_EX_PALETTEWINDOW = (WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST);
        public const UInt32 WS_EX_LAYERED = 0x00080000;
        public const UInt32 WS_EX_NOINHERITLAYOUT = 0x00100000; // Disable inheritence of mirroring by children
        public const UInt32 WS_EX_LAYOUTRTL = 0x00400000; // Right to left mirroring
        public const UInt32 WS_EX_COMPOSITED = 0x02000000;
        public const UInt32 WS_EX_NOACTIVATE = 0x08000000;

    }
}