using System;
using System.Collections.Generic;
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 the work area of the current monitor
		Rectangle monitorBounds = BFS.Monitor.GetMonitorWorkAreaByWindow(windowHandle);
		
		//set up the window position array
		//the order is top-left, bottom-left, top-right, bottom-right
		Rectangle[] windowPositions = 
		{
			new Rectangle(monitorBounds.X, monitorBounds.Y, monitorBounds.Width / 2, monitorBounds.Height / 2),
			new Rectangle(monitorBounds.X, monitorBounds.Y + monitorBounds.Height / 2, monitorBounds.Width / 2, monitorBounds.Height / 2),
			new Rectangle(monitorBounds.X + monitorBounds.Width / 2, monitorBounds.Y, monitorBounds.Width / 2, monitorBounds.Height / 2),
			new Rectangle(monitorBounds.X + monitorBounds.Width / 2, monitorBounds.Y + monitorBounds.Height / 2, monitorBounds.Width / 2, monitorBounds.Height / 2),
		};
		
		//get a list of all the visible windows, but only include windows that we want to tile
		List<IntPtr> windows = new List<IntPtr>();
		foreach(IntPtr window in BFS.Window.GetVisibleWindowHandlesByMonitor(BFS.Monitor.GetMonitorIDByWindow(windowHandle)))
		{
			//ignore any DisplayFusion windows (title bar buttons, etc.)
			//ignore pesky hidden explorer.exe windows
			if((BFS.Window.GetClass(window).StartsWith("DF", StringComparison.OrdinalIgnoreCase)) ||
				(BFS.Window.GetClass(window).Equals("EdgeUiInputTopWndClass", StringComparison.OrdinalIgnoreCase)) ||
				(BFS.Window.GetClass(window).Equals("Shell_TrayWnd", StringComparison.OrdinalIgnoreCase)) ||
				(BFS.Window.GetClass(window).Equals("WorkerW", StringComparison.OrdinalIgnoreCase)) ||
				(BFS.Window.GetClass(window).Equals("Progman", StringComparison.OrdinalIgnoreCase)) ||
				(BFS.Window.GetClass(window).Equals("SearchPane", StringComparison.OrdinalIgnoreCase)))
			{
				continue;
			}
			
			//add the window to the list
			windows.Add(window);
		}

		//loop through the list of windows
		for(int i = 0; i < windows.Count; i++)
		{			
			//check to see if this is the last window in the list
			bool isLastWindow = (i == windows.Count - 1);
			
			//get the index of windowPositions we should use
			int index = i % windowPositions.Length;
			
			//if it's the last window in the list and we're on the top-left position, put the window on the left side of the monitor
			if((isLastWindow) && (index == 0))
				BFS.Window.MoveToLeftMonitorHalf(windows[i]);
				
			//if it's the last window in the list and we're on the top-right position, put the window on the right side of the monitor
			else if((isLastWindow) && (index == 2))
				BFS.Window.MoveToRightMonitorHalf(windows[i]);
				
			//position the window according to the windowPositions array
			else
				BFS.Window.SetSizeAndLocation(windows[i], windowPositions[index].X, windowPositions[index].Y, windowPositions[index].Width, windowPositions[index].Height);
		}
	}
}