'''
Created on Oct 5, 2011, Modified Oct 20, 2014

@author: rodger
'''
import os
import tkFileDialog
import random

    
def choose_file_to_open():
    """
    prompt for existing file, return the file (open for reading)
    """
    file = tkFileDialog.askopenfile(title="choose a file", initialdir=os.getcwd())
    return file

def processFile(file):
    '''
    process the lines in a file (which has one name per line),
    return a list of names

    #TODO:
    lines = []
    for line in file:
        lines.append(line.strip())
    return lines
    '''
    return [line.strip()   for line in file]
    
    
    
    
    return 
    
def randomize(students):
    '''
    shuffle the students in the list and return this new list
    '''
    #TODO:
    for num in range(0, len(students)):
        randomPosition = random.randint(0, len(students -1))
        # swap the items in positions num and randomPosition
        '''
        These two lines do not swap a student 
        students[num] = students[randomPosition]
        students[randomPosition] = students[num]
        '''
        temp = students[num]
        students[num] = students[randomPosition]
        students[randomPosition] = temp
    return students



    return students

def printGroups(students):
    ''' print the students 3 per group with Group number starting w/1 '''
    count = 1
    print "Group 1:"
    for stud in students:
        print stud
        #TODO: add code to print 3 per group
 


        count += 1

    

students = processFile(choose_file_to_open()) 
print students
randomize(students)       
print students
print
printGroups(students)