#encoding:utf-8
require "tk"
count = 180
stop_counter=false
start_counter=true
restart_counter=false
reresteart_counter=false
label=TkLabel.new
clock=TkLabel.new(text:count)

button=TkButton.new{
	text "Start"
	command{TkTimer.start(1000){
                  if stop_counter == false && start_counter == true 
                    count = count - 1
	            clock.text = count
                    elsif stop_counter==true && start_counter == false && restart_counter == false
                   next
                    elsif stop_counter == true&& start_counter==false&& restart_counter == true 
                   count = count -1
                  clock.text=count
                  end
                   }

	}
}
button2=TkButton.new{
  text:"Stop"
  command {stop_counter=true
   start_counter=false
    restart_counter=false}}
button3=TkButton.new{
  text:"Reset"
  command{ 
    
    count=180
    clock.text=count
    stop_counter = true
    start_counter=false
    restart_counter=false
   }}
button4=TkButton.new{
  text:"Quit"
  command{Tk.root.destroy()}}
button5=TkButton.new{
  text:"ReStart"
  command{
    stop_counter=true
    start_counter=false
    restart_counter=true}}
label.pack

button.pack
button2.pack
button3.pack
button4.pack
button5.pack
clock.pack


Tk.mainloop