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from Tkinter import *
from time import sleep
import threading

class App(Frame):
	def __init__(self, *args, **kw):
		Frame.__init__(self, *args, **kw)
		
		self.btn_style = dict(bd=2, activeforeground='red')
		
		self.top = Frame(bg="black")
		self.top.grid(row=0, column=0, padx=10, pady=10)
		self.entries = []
		for i in range(10):
			e  = Entry(self.top, width=3, bg='#cccccc', justify="center", bd=0, font=("Times", 40, "bold"))
			self.entries.append(e)
			e.grid(row=0, column=i, pady=3, padx=5)
		
		
		self.bottom = Frame(self)
		self.bottom.grid(row=1, column=0, columnspan=10)
		
		self.btn = Button(self.bottom, command=self._start, text="go!", width=8, **self.btn_style)
		
		self.btn.grid(row=1, column=0)
		Button(self.bottom, text="best case", command=self._best_case, **self.btn_style).grid(row=1, column=1)
		Button(self.bottom, text="worst case", command=self._worst_case, **self.btn_style).grid(row=1, column=2)
		self.wait_time = IntVar(); Scale(self.bottom, from_=1, to=300, orient="horizontal", variable=self.wait_time, bd=0).grid(row=1, column=3)
			
	def _case(self, best):
		for c, entr in enumerate(self.entries):
			entr.delete(0, END); entr.insert(0, str(c if best else (10-c)))
	def _best_case(self): self._case(True)
	def _worst_case(self): self._case(False)
	
	def _start(self):
		print "start"
		self.btn.config(command=self._pause, text="pause")
		self.paused = False
		threading.Thread(target=self.mk_colored).start()
	
	def _continue(self):
		print 'continue'
		self.btn.config(command=self._pause, text="pause")
		self.paused = False
	
	def mk_colored(self):
		i = 0
		up = True
		while True:
			if up:
				if i >= len(self.entries)-1:
					up = False
					continue
				i += 1
			else:
				if i <= 1:
					up = True
					continue
				i -= 1
			
			
			entr0 = self.entries[i-1]
			entr1 = self.entries[i]			
			entr0.config(bg="red"); entr1.config(bg="red")
			wt = self.wait_time.get()/200.0
			
			while self.paused:
				sleep(0.15)
			
			sleep(wt); self._cmp_and_swap(self.entries[i-1], self.entries[i]); sleep(wt)
			entr0.config(bg="#cccccc"); entr1.config(bg="#cccccc")			
		
	def _cmp_and_swap(self, entr0, entr1):
		
		entr0_get = entr0.get()
		if entr0_get.isdigit(): entr0_get = int(entr0_get)
		entr1_get = entr1.get()
		if entr1_get.isdigit(): entr1_get = int(entr1_get)
		
		if entr0_get > entr1_get:
			entr0.delete(0, END); entr0.insert(0, entr1_get)
			entr1.delete(0, END); entr1.insert(0, entr0_get)

	def _pause(self):
		print 'pause'
		self.btn.config(command=self._continue, text="continue")
		self.paused = True


root = Tk()
App(root).grid()
root.mainloop()