using System;
using System.Drawing;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;

// The 'windowHandle' parameter will contain the window handle for the:
//   - Active window when run by hotkey
//   - Trigger target when run by a Trigger rule
//   - TitleBar Button owner when run by a TitleBar Button
//   - Jump List owner when run from a Taskbar Jump List
//   - Currently focused window if none of these match
public static class DisplayFusionFunction
{
    public static void Run(IntPtr windowHandle)
    {
        try
        {
            Bitmap bmp = PrintWindow(windowHandle);
            Clipboard.SetImage(bmp);
        }
        catch (System.Exception ex)
        {
            BFS.Dialog.ShowTrayMessage($"Error capturing window: {ex.Message}");
        }
    }

    [DllImport("user32.dll")]
    public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
    [DllImport("user32.dll")]
    public static extern bool PrintWindow(IntPtr hWnd, IntPtr hdcBlt, int nFlags);

    public static Bitmap PrintWindow(IntPtr hwnd)
    {
        RECT rc;
        GetWindowRect(hwnd, out rc);

        Bitmap bmp = new Bitmap(rc.Width, rc.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
        Graphics gfxBmp = Graphics.FromImage(bmp);
        IntPtr hdcBitmap = gfxBmp.GetHdc();

        PrintWindow(hwnd, hdcBitmap, 0);

        gfxBmp.ReleaseHdc(hdcBitmap);
        gfxBmp.Dispose();

        return bmp;
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        private int _Left;
        private int _Top;
        private int _Right;
        private int _Bottom;

        public RECT(int Left, int Top, int Right, int Bottom)
        {
            _Left = Left;
            _Top = Top;
            _Right = Right;
            _Bottom = Bottom;
        }

        public int Height
        {
            get    { return _Bottom - _Top; }
            set { _Bottom = value + _Top; }
        }
        public int Width
        {
            get { return _Right - _Left; }
            set { _Right = value + _Left; }        
        }
    }
}