using System;
using System.Linq;
using Microsoft.Win32;

public static class DisplayFusionFunction
{
    // Replaces the Windows taskbar with a DisplayFusion taskbar by exploiting transparency behavior.
    // When Windows taskbar is fully transparent, it stops receiving input.
    // Requires "Show DisplayFusion taskbar on Windows taskbar monitor" setting to be enabled.
	//
	// Note: Taskbar movement is required to avoid DF taskbar remaining the height of the Windows taskbar away from the edge of the screen.
	// Note: Initialization delay is required for DF to realize that we've moved prior to moving back.
	// Note: Initialization delay needs to exceed 350ms on an i9-9900k to work reliably; padded to 1000ms for compatibility.
    public static void Run(IntPtr windowHandle)
    {   
        var taskbarHandle = BFS.Window.GetWindowByClass("Shell_TrayWnd");
        if (taskbarHandle == IntPtr.Zero) return;

        var monitorId = BFS.Monitor.GetMonitorIDByWindow(taskbarHandle);
        var monitorBounds = BFS.Monitor.GetMonitorBoundsByID(monitorId);

        // Parse Windows taskbar position from Registry
        var taskbarPosition = (Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Explorer\StuckRects3")?.GetValue("Settings") as byte[])?[12] switch
            { 0x00 => "L", 0x01 => "T", 0x02 => "R", _ => "B" };

        // Find existing DF taskbar on this monitor (if one exists)
        var existingClass = BFS.Window.GetAllWindowHandles()
            .Select(w => BFS.Window.GetClass(w))
            .FirstOrDefault(c => c.StartsWith("DFTaskbar:") && 
                BFS.Window.GetBounds(BFS.Window.GetWindowByClass(c)).IntersectsWith(monitorBounds));

        // Create temporary taskbar opposite the Windows taskbar
        var tempPosition = taskbarPosition switch { "L" => "R", "R" => "L", "T" => "B", _ => "T" };
        BFS.DisplayFusion.EnableTaskbarOnSide(monitorId, tempPosition);

        // Wait for temporary taskbar to appear
        string newTaskbarClass;
        while ((newTaskbarClass = BFS.Window.GetAllWindowHandles()
            .Select(w => BFS.Window.GetClass(w))
            .FirstOrDefault(c => c.StartsWith("DFTaskbar:") && 
                BFS.Window.GetBounds(BFS.Window.GetWindowByClass(c)).IntersectsWith(monitorBounds))) == existingClass || newTaskbarClass == null)
        {
            BFS.General.Sleep(100);
        }

        // Hide temporary taskbar and wait for initialization
        BFS.Window.SetTransparency(BFS.Window.GetWindowByClass(newTaskbarClass), 0);
        BFS.General.Sleep(1000);

        // Disable Windows taskbar and move DF taskbar to final position
        BFS.Window.SetTransparency(taskbarHandle, 0);
        BFS.DisplayFusion.EnableTaskbarOnSide(monitorId, taskbarPosition);
    }
}