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

// 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
{
	[DllImport("user32.dll", SetLastError = true)]
	static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
	const uint GW_HWNDNEXT = 2;
	
	public static void Run(IntPtr windowHandle)
	{
		//change this to the monitor id of the monitor you expect fullscreen windows to run on
		uint fullscreenMonitorId = BFS.Monitor.GetPrimaryMonitorID();
		
		//get the handle for the topmost window
		IntPtr topmost = GetTopmostWindowOfMonitor(fullscreenMonitorId, windowHandle);
		
		//if no window was found, exit the script
		if(topmost == IntPtr.Zero)
			return;
			
		//get the bounds for the monitor and the window
		Rectangle fullScreenMonitorBounds = BFS.Monitor.GetMonitorBoundsByID(fullscreenMonitorId);
		Rectangle windowBounds = BFS.Window.GetBounds(topmost);

		//if the bounds of the two rectangles are not equal, a fullscreen app is not running. exit the script
		if(!fullScreenMonitorBounds.Equals(windowBounds))
			return;

		//if we got this far that means there's a fullscreen app running
		//move the window to the second monitor
		BFS.Window.MoveToMonitor(2, windowHandle);
	}
	
	private static IntPtr GetTopmostWindowOfMonitor(uint monitorId, IntPtr excludeWindow)
	{
		//loop backwards through the z-order, starting with the focused window
		for(IntPtr window = BFS.Window.GetFocusedWindow(); window != IntPtr.Zero; window = GetWindow(window, GW_HWNDNEXT))
		{
			//if we're excluding this window, continue
			if(window == excludeWindow)
				continue;
				
			//if this window isn't in the monitor we're looking for, continue to the next one
			if(BFS.Monitor.GetMonitorIDByWindow(window) != monitorId)
				continue;
				
			//ignore the window if it is a pesky hidden explorer window or a displayfusion window
			if(BFS.Window.GetClass(window).StartsWith("DF", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("EdgeUiInputWndClass", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("NativeHWNDHost", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("ModeInputWnd", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("EdgeUiInputTopWndClass", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("SearchPane", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("ImmersiveLauncher", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("Shell_TrayWnd", StringComparison.OrdinalIgnoreCase) ||
				BFS.Window.GetClass(window).Equals("WorkerW", StringComparison.OrdinalIgnoreCase))
			{
				continue;
			}

			if(string.IsNullOrEmpty(BFS.Window.GetText(window)))
				continue;
			
			if(BFS.Application.GetMainFileByWindow(window).Contains("growl"))
				continue;
			
			//this must be the topmost window on this monitor. return the value
			return window;
		}
		
		//if we got this far that means we found nothing. return IntPtr.Zero
		return IntPtr.Zero;
	}
}