using System;
using System.Drawing;

// The 'windowHandle' parameter will contain the window handle for the:
//   - Active window when run by hotkey
//   - Window Location target when run by a Window Location 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)
	{
		//get all of the monitor work areas
		Rectangle[] monitorBounds = BFS.Monitor.GetMonitorWorkAreas();
		
		//find the size and location of the current window
		Rectangle windowBounds = BFS.Window.GetBounds(windowHandle);		
		
		//enumerate through all of the monitor work areas until we find
		//which monitor the window is in
		Rectangle currentMonitor = Rectangle.Empty;
		int currentMonitorIndex = 0;
		foreach(Rectangle monitor in monitorBounds)
		{
			//if the X coordinate of the window isn't in this monitor, continue
			if(!monitor.Contains(new Point(windowBounds.X, 0)))
			{
				currentMonitorIndex++;
				continue;
			}
				
			//if we found the monitor, save the variable and exit
			currentMonitor = monitor;
			break;	
		}
		
		//if we couldnt find the monitor, put the monitor on the leftmost monitor and exit the script
		if(currentMonitor.Equals(Rectangle.Empty))
		{
			BFS.Window.SetSizeAndLocation(windowHandle, monitorBounds[0].X, monitorBounds[0].Y, monitorBounds[0].Width, monitorBounds[0].Height);
			return;
		}
		
		//if the window is positioned in the window, span the window across the two monitors
		if(currentMonitor.Equals(windowBounds))
		{
			//if we are on the rightmost monitor, move it to the leftmost and exit the script
			if(currentMonitorIndex == monitorBounds.Length - 1)
			{
				BFS.Window.SetSizeAndLocation(windowHandle, monitorBounds[0].X, monitorBounds[0].Y, monitorBounds[0].Width, monitorBounds[0].Height);
				return;
			}
			
			//span the window across the two monitors and exit the script
			BFS.Window.SetSize(windowHandle, currentMonitor.Width + monitorBounds[currentMonitorIndex].Width, monitorBounds[currentMonitorIndex].Height);
			return;
		}
		else if((windowBounds.Width < currentMonitor.Width) || (windowBounds.Height < currentMonitor.Height))
		{
			//if the window is smaller than the current monitor, maximize it
			BFS.Window.SetSizeAndLocation(windowHandle, currentMonitor.X, currentMonitor.Y, currentMonitor.Width, currentMonitor.Height);
		}
		else
		{
			//if we got this far, we need to move the window to the next monitor
			int nextMonitor = ++currentMonitorIndex % monitorBounds.Length;
			BFS.Window.SetSizeAndLocation(windowHandle, monitorBounds[nextMonitor].X, monitorBounds[nextMonitor].Y, monitorBounds[nextMonitor].Width, monitorBounds[nextMonitor].Height);
		}		
	}
}