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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#  rot13.py
#  
#  Copyright 2014 [email protected]
#  
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#  
#  
from escape_function import escape_html
import webapp2
 
form = """
<!DOCTYPE html>
 
<html>
  <head>
    <title>Unit 2 Rot 13</title>
  </head>
 
  <body>
    <h2>Enter some text to ROT13:</h2>
    <form method="post">
      <textarea name="text" style="height: 100px; width: 400px;">%(text)s</textarea>
      <br>
      <input type="submit">
    </form>
  </body>
 
</html>
"""
class MainPage(webapp2.RequestHandler):
    def write_form(self, text = ""):
        self.response.out.write(form % {"text": escape_html(text)})
        
        
    def get(self):
        self.write_form()
        
    def post(self):
        user_text = self.rot13a(self.request.get('text'))
        
        self.write_form(user_text)
        
    def rot13a(self, text):
        abc = list("abcdefghijklmnopqrstuvwxyz")
        ABC = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
        lst = list(text)
        newlst = []
        for i in lst:
            if i in abc:
                ind = abc.index(i)
                ind = (ind + 13)%26
                newlst.append(abc[ind])
            elif i in ABC:
                ind = ABC.index(i)
                ind = (ind + 13)%26
                newlst.append(ABC[ind])
            else:
                newlst.append(i)
        txt = ""
        text = txt.join(newlst)
        return text
        
 
 
application = webapp2.WSGIApplication([('/', MainPage)],debug=True)