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
{
	private static string WindowSizeSettingsKey = "ToggleWindowSizeSettings";
	public static void Run(IntPtr windowHandle)
	{
		//get the bounds of the window and the monitor it is in
		Rectangle monitorBounds = BFS.Monitor.GetMonitorWorkAreaByWindow(windowHandle);
		Rectangle windowBounds = BFS.Window.GetBounds(windowHandle);
				
		if((windowBounds.Width == monitorBounds.Width) && (windowBounds.Height == monitorBounds.Height))
		{
			//if the window is the size of the monitor, load settings and restore
			//load the settings
			IntPtr oldWindow;
			Rectangle oldBounds;
			LoadSettings(out oldWindow, out oldBounds);
			
			//check to see if the settings were loaded properly
			if(oldWindow == IntPtr.Zero)
				return;
				
			//if it isn't the same window, exit
			if(windowHandle.ToInt64() != oldWindow.ToInt64())
				return;
				
			//restore the window position
			BFS.Window.SetSizeAndLocation(windowHandle, oldBounds.X, oldBounds.Y, oldBounds.Width, oldBounds.Height);
		}
		else
		{
			//if the window is smaller than the monitor, save settings
			SaveSettings(windowHandle, windowBounds);
			
			//make the window the size of the monitor it is in
			BFS.Window.SetSizeAndLocation(windowHandle, monitorBounds.X, monitorBounds.Y, monitorBounds.Width, monitorBounds.Height);
		}
	}
	
	//this function loads settings that we have previously stored
	private static void LoadSettings(out IntPtr oldWindow, out Rectangle oldBounds)
	{
		//try and load settings
		try
		{
			//split up the settings string into its seperate values
			string[] settings = BFS.ScriptSettings.ReadValue(WindowSizeSettingsKey).Split(new char[] {'|'}, StringSplitOptions.RemoveEmptyEntries);
			//set the parameters to their default values
			oldWindow = IntPtr.Zero;
			oldBounds = new Rectangle();
			
			//check to see if we have enough parameters saved to the setting
			if(settings.Length != 5)
				throw new Exception("Incorrect settings format");
				
			//set the values
			oldWindow = new IntPtr(Convert.ToInt64(settings[0]));
			oldBounds = new Rectangle(
				Convert.ToInt32(settings[1]),
				Convert.ToInt32(settings[2]),
				Convert.ToInt32(settings[3]),
				Convert.ToInt32(settings[4]));			
		}
		catch(Exception ex)
		{
			//if we encountered an error, make sure the parameters are set to the default values
			oldWindow = IntPtr.Zero;
			oldBounds = new Rectangle();
		}
	}
	
	//this function saves settings
	private static void SaveSettings(IntPtr window, Rectangle bounds)
	{
		//make the setting string
		string settings = string.Format("{0}|{1}|{2}|{3}|{4}", window.ToInt64(), bounds.X, bounds.Y, bounds.Width, bounds.Height);
		
		//save the setting
		BFS.ScriptSettings.WriteValue(WindowSizeSettingsKey, settings);
	}
}