using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace LLib.ImGui;

public static class WindowFlash
{
	private struct FLASHWINFO
	{
		public uint cbSize;

		public nint hwnd;

		public uint dwFlags;

		public uint uCount;

		public uint dwTimeout;
	}

	private const uint FLASHW_ALL = 3u;

	private const uint FLASHW_TIMERNOFG = 12u;

	[LibraryImport("user32.dll")]
	[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
	[GeneratedCode("Microsoft.Interop.LibraryImportGenerator", "10.0.14.37416")]
	[SkipLocalsInit]
	[return: MarshalAs(UnmanagedType.Bool)]
	private unsafe static bool FlashWindowEx(ref FLASHWINFO pwfi)
	{
		int num;
		fixed (FLASHWINFO* _pwfi_native = &pwfi)
		{
			num = __PInvoke(_pwfi_native);
		}
		return num != 0;
		[DllImport("user32.dll", EntryPoint = "FlashWindowEx", ExactSpelling = true)]
		[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
		static extern unsafe int __PInvoke(FLASHWINFO* __pwfi_native);
	}

	public static void Flash(nint hwnd, uint count = 3u)
	{
		if (hwnd != 0)
		{
			FLASHWINFO pwfi = new FLASHWINFO
			{
				cbSize = (uint)Marshal.SizeOf<FLASHWINFO>(),
				hwnd = hwnd,
				dwFlags = ((count == 0) ? 15u : 3u),
				uCount = count,
				dwTimeout = 0u
			};
			FlashWindowEx(ref pwfi);
		}
	}
}