using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
using System.Threading.Tasks;

//version 1.0
//Know-Issues:Position is not automatically set, please use a custom fuction of DisplayFusion for set the clock location
public static class DisplayFusionFunction
{
	static Label hour = new Label();
	static Label seconds = new Label();
	static int hh;
	static int MM;
	static int ss;
	
	public static void Run(IntPtr windowHandle)
	{			
		Form form = new Form();
		form.TopMost = true;
		form.StartPosition = FormStartPosition.Manual;
		form.ShowIcon = false;
		form.FormBorderStyle = FormBorderStyle.None;
		form.BackColor = System.Drawing.SystemColors.ControlText;
		form.Width = 48;
		form.Height = 19;
		form.MinimumSize = new System.Drawing.Size(48, 19);
		
		hour.AutoSize = true;
        hour.ForeColor = System.Drawing.SystemColors.ControlLightLight;
        hour.Location = new System.Drawing.Point(-1, 2);
        hour.Size = new System.Drawing.Size(30, 13);
		hour.Parent = seconds;
		hour.BackColor = System.Drawing.Color.Transparent;
		
		seconds.AutoSize = true;
        seconds.ForeColor = System.Drawing.SystemColors.ControlLightLight;
        seconds.Location = new System.Drawing.Point(31, 2);
		seconds.BackColor = System.Drawing.Color.Transparent;
        seconds.Size = new System.Drawing.Size(18, 13);
		
		form.Controls.Add(seconds);
		form.Controls.Add(hour);
		
		 System.Reflection.PropertyInfo aProp = 
         typeof(System.Windows.Forms.Control).GetProperty(
               "DoubleBuffered", 
               System.Reflection.BindingFlags.NonPublic | 
               System.Reflection.BindingFlags.Instance);

   		aProp.SetValue(seconds, true, null); 
		aProp.SetValue(hour, true, null); 
		
		hh = DateTime.Now.Hour;
		MM = DateTime.Now.Minute;
		ss = DateTime.Now.Second;
		
		changeHour();
		
		Task.Factory.StartNew(() =>
		{
			while(true)
			{
				Thread.Sleep(998);
				Elapsed();
			}
			
		});
				
		form.ShowDialog();		
	}
	
	static Action changeHour = () => hour.Text = hh.ToString("00")+":"+MM.ToString("00")+":";
	static Action changeSeconds = () => seconds.Text = ss.ToString();//Need to put a minimum of effort into changing seconds
	
	private static void Elapsed()
	{
		if(++ss == 60)
		{
			ss = 0;
			if(++MM == 60)//Just to make sure, we reset counters here, so ms errors don't turn into seconds, then minutes, and so on
			{
				var date = DateTime.Now;
				MM = date.Minute;
				hh = date.Hour;
				
				//Order is important, because every millisecond counts
				ss = DateTime.Now.Second;
				if (ss == 60)//If it is exactly 60, we need to reset it.
					ss = 0;
			}
			hour.Invoke(changeHour);
		}
		seconds.Invoke(changeSeconds);
	}
}