#$Author : kc - Nico.
#$license GPL 


import string
import Tkinter
import tkFont
import sys
from os.path import exists 

MODE_READ="r"
MODE_WRITE="w+"



class Start(Tkinter.Frame):
	def __init__(self):
		Tkinter.Frame.__init__(self)
		self.TextFileW=Tkinter.StringVar()
		self.TextFileR=Tkinter.StringVar()
		self.TextChars=Tkinter.StringVar()
		self.TextNew=Tkinter.StringVar()
		self.x=0
		self.Label=None
		self._GUI_Tkinter()
	def _GUI_Tkinter(self):
		TextFrame=Tkinter.Frame()
	       	Label=Tkinter.Label(TextFrame,text="File to read:")
		Label.pack(side=Tkinter.LEFT)
		FileRead=Tkinter.Entry(TextFrame,textvariable=self.TextFileW).pack(side=Tkinter.LEFT)
		Tkinter.Label(TextFrame,text="New file to write:").pack(side=Tkinter.LEFT)
		FileWrite=Tkinter.Entry(TextFrame,textvariable=self.TextFileR).pack(side=Tkinter.LEFT)	
		TextFrame.pack()
		LabelFrame=Tkinter.Frame()	
		Tkinter.Label(LabelFrame,text="Word to change:").pack(side=Tkinter.LEFT)
		String=Tkinter.Entry(LabelFrame,textvariable=self.TextChars).pack(side=Tkinter.LEFT)
		Tkinter.Label(LabelFrame,text="New word:").pack(side=Tkinter.LEFT)
		NewWord=Tkinter.Entry(LabelFrame,textvariable=self.TextNew).pack(side=Tkinter.LEFT)
		
		LabelFrame.pack()
		ButtonFrame=Tkinter.Frame()
		ButtonGo=Tkinter.Button(ButtonFrame,text="Let's Go!",relief=Tkinter.RAISED,background="green",command=self.ButtonFunction).pack()
		Tkinter.Button(ButtonFrame,text="Exit",relief=Tkinter.RAISED,background="pink",command=sys.exit).pack()
		Tkinter.Button(ButtonFrame,text="About",relief=Tkinter.RAISED,background="azure",command=self.Author).pack()
		ButtonFrame.pack(anchor=Tkinter.W,fill=Tkinter.X)
		

	def Author(self):
		
		if self.x == 0 :
			Tkinter.Label(text="Author: Nicola Piazzolla. License GPL").pack(side=Tkinter.BOTTOM)
			self.x=self.x+1
		
	          


	def ButtonFunction(self):
		
		fileread=self.TextFileW.get()
		filewrite=self.TextFileR.get()
		string=self.TextChars.get()
		new=self.TextNew.get()
		
		if fileread=='' or filewrite=='':
			if self.Label == None:
				framez=Tkinter.Frame()
				self.Label=Tkinter.Label(framez,text="Error: You must type fileread, and filewrite").pack()
				framez.pack()
				self.Label=1
			
			
		
				
			
		self.RW_File(fileread,filewrite,string,new)
	
	def RW_File(self,fileread,filewrite,string,new):


		mode=exists(filewrite)
		
		if (mode == 1):
			sys.exit("This File exist before. Change it!\n")
		try:
		   pathwrite=open(filewrite,MODE_WRITE)
		except IOError, gest:
		   print  gest.filename , gest.strerror

		try:
		   pathread=open(fileread,MODE_READ)
		except IOError, gest:
		   print  gest.filename, gest.strerror
		for strings in pathread.readlines():
			pathwrite.write(strings.replace(string,new))
			
		pathread.close()
		pathwrite.close()


if (__name__=="__main__"):
	    
   		incoming=Start()
		incoming.mainloop()