#--- Header Comments ---
#Date: 9/10/19
#Coder: klp
#Path: 
#File: 
#Purpose: 
#Notes: 
#TODO: 

#--- Imports ---
import datetime #for current time
import getpass  #for username
import os       #for current path
import sys      #for versioning


#--- Global Variables ---

#--- Functions ---

def print_current_user():
    username = getpass.getuser()
    print('Coder: ' + username)
    #https://stackoverflow.com/questions/5137497
    /find-current-directory-and-files-directory
    dir_path = os.path.dirname(os.path.realpath(__file__))
    print(dir_path)
#end print_current_user function
    
def print_current_time():
    now = datetime.datetime.now()
    print(now)
#end print_current_time function
    
def print_simple_heading(heading, symbol, n):
    my_decoration = ''
    for _ in range(n):
        my_decoration += symbol
    my_heading = my_decoration + heading + my_decoration;
    print(my_heading)
#end print_simple_heading function

def make_string_from_char(ch, length):
    temp = ''
    for _ in range(length):
        temp += ch
    return temp
#end make_string_from_char function

#utilize default parameter values
def intro(title="Python App", stageNo='TBD', explanation=''):
    num_char = 5
    my_char = '='
    title = title + ": Stage " + str(stageNo)
    print_simple_heading(title, my_char, num_char)
    print_current_user()
    print_current_time()
    print("Version:", sys.version)
    if len(explanation) > 0:
        print("")
        print(explanation)
    border_length = len(title) + 2*num_char;
    border = make_string_from_char(my_char, border_length)
    print(border)  
#end intro function

#---My Functions---

def translate(msg, shift):
    vowels = "aeiou"
    consonants = "bcdfghjklmnpqrstvwxyz"
    alphabet = vowels + consonants
    alphabet = ''.join(sorted(alphabet))
    translatedMsg = ""
    for symbol in msg:
        tsymbol = symbol.lower()
        shiftedSymbol = symbol
        if tsymbol in alphabet:
            if tsymbol in vowels:
                ndx = vowels.find(tsymbol)
                shiftedNdx = (ndx + shift) % len(vowels)
                shiftedSymbol = vowels[shiftedNdx: shiftedNdx + 1]
            else:
                ndx = consonants.find(tsymbol)
                shiftedNdx = (ndx + shift) % len(consonants)
                shiftedSymbol = consonants[shiftedNdx: shiftedNdx + 1]
        
        if symbol == tsymbol.upper(): #original was upper case
            shiftedSymbol = shiftedSymbol.upper()
        #end alphabet block
        translatedMsg += shiftedSymbol
    #end for loop
    return translatedMsg
#end function translate

#--- Driver Code ---
def main():
    explanation = 
    'This app allows 2-way translation using the same function!'
    intro(stageNo=9, explanation=explanation)
    print("===Our Alien Language App===")

    defaultMsg = "What we learn with pleasure we never forget."
    while True: 
        msg = input("\nYour phrase: ('x' to exit) ==> ")
        if msg.lower() == 'x':
            break;
        if len(msg) == 0:
            msg = defaultMsg
        print("\nOriginal msg: ")
        print(msg)
        shift = input("Your shift: ==> ")
        shift = int(shift)
        print()
        translatedMsg = translate(msg, shift)
        
        print("Translated Message: ")
        print(translatedMsg)
        
        print("\nRe-Translated Message:")
        retranslatedMsg = translate(translatedMsg, -shift)
        print(retranslatedMsg)
    #end while loop
    print()
    print("Thanks for using our app!")
    
#end function main

if __name__ == '__main__':
    main()
    
'''
    =====Python App: Stage 9=====
Coder: kp
/Users/kp/Desktop/2019-2020_Devmt/kp19-HCSF-T1/
Demos/AlienLanguageSagaWS/
AlienLanguagePrj-S8_9
2019-09-10 07:34:15.031860
Version: 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 16:52:21) 
[Clang 6.0 (clang-600.0.57)]

This app allows 2-way translation using the same function!
=============================
===Our Alien Language App===

Your phrase: ('x' to exit) ==> 

Original msg: 
What we learn with pleasure we never forget.
Your shift: ==> 6

Translated Message: 
Dpeb di sieyv dobp wsiezayi di viciy muynib.

Re-Translated Message:
What we learn with pleasure we never forget.

Your phrase: ('x' to exit) ==> Hello, World: 
We love computer science with Python!

Original msg: 
Hello, World: We love computer science with Python!
Your shift: ==> -3

Translated Message: 
Dohha, Sanhz: So haro yajleqon pyuokyo suqd Lvqdak!

Re-Translated Message:
Hello, World: We love computer science with Python!

Your phrase: ('x' to exit) ==> x

Thanks for using our app!
'''                        

Last update: 09/18/19

---