using System;
using System.Drawing;
using System.Collections.Generic;

// 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
{
	private const string ClickThroughWindowPropertyKey = "ClickThrough";
	
	public static void Run(IntPtr windowHandle)
	{
		// If no window handle is provided, bail out
        if (windowHandle == IntPtr.Zero)
        {
            BFS.Dialog.ShowMessageInfo("No window handle was passed to the script!");
            return;
        }
		
		// Check the window property
		bool isClickThroughEnabled = (BFS.Window.GetWindowProperty(windowHandle, ClickThroughWindowPropertyKey) == new IntPtr(1));
		
		// Toggle click through
		if(isClickThroughEnabled)
			DisableClickThrough(windowHandle);
		else
			EnableClickThrough(windowHandle);
	}
	
	private static void DisableClickThrough(IntPtr windowHandle)
    {
        // Remove click-through styles
        var exStyle = BFS.Window.GetWindowStyleEx(windowHandle);
        exStyle &= ~BFS.WindowEnum.WindowStyleEx.WS_EX_TRANSPARENT;
        exStyle &= ~BFS.WindowEnum.WindowStyleEx.WS_EX_LAYERED;
        BFS.Window.SetWindowStyleEx(exStyle, windowHandle);

        // Remove the window property
        BFS.Window.RemoveWindowProperty(windowHandle, ClickThroughWindowPropertyKey);
    }


    private static void EnableClickThrough(IntPtr windowHandle)
    {
        // Get the current extended styles as an enum
        var exStyle = BFS.Window.GetWindowStyleEx(windowHandle);

        // Add WS_EX_TRANSPARENT + WS_EX_LAYERED to make it click-through
        exStyle |= BFS.WindowEnum.WindowStyleEx.WS_EX_TRANSPARENT;
        exStyle |= BFS.WindowEnum.WindowStyleEx.WS_EX_LAYERED;
        BFS.Window.SetWindowStyleEx(exStyle, windowHandle);

        // Set a window property
		BFS.Window.SetWindowProperty(windowHandle, ClickThroughWindowPropertyKey, new IntPtr(1));
    }
}