#!/usr/bin/env python3

"""
number_guessing_game2-commented.py
This version of the Number Guessing Game makes things a bit more
challenging for the guesser--actually *impossible*--by NOT 
actually selecting the expected `secret_number` until after the
user has tried to guess what it is.
"""

__author__ = "Richard White"
__version__ = "2022-01-22"

import random

def main():

    #########################################################
    #                                                       #
    #       Introductions and Initializations               #
    #                                                       #
    #  The `lower` and `upper` variables are used to keep   #
    #  track of the possible range of values that haven't   #
    #  yet been eliminated by an intelligent guessing       #
    #  strategy.                                            #
    #                                                       #
    #########################################################
    
    print("Number Guessing Game!")    
    print("I'm thinking of a number from 1-10. You have three guesses. GO!")
    guess_number = 1
    lower = 1
    upper = 10
    
    #########################################################
    #                                                       #
    #     The guessing loop, which only allows three        #
    #     three guesses. No need to check to see if         #
    #     they've guessed the number. They never will!      #
    #                                                       #
    #########################################################
    
    while guess_number <= 3:
        print("Guess #" + str(guess_number) + ": ", end='')
        user_guess = int(input())
        
        #####################################################
        #                                                   #
        #       The if-else statement here chooses one      #
        #       half of the range to place the secret       #
        #       number, depending on which half is larger.  #
        #                                                   #
        #       Once an `upper` or `lower` has been set,    #
        #       it won't be readjusted in the "wrong"       #
        #       direction by subsequent guesses, which      #
        #       could happen if we don't check the range    #
        #       of the user's guess, as is done in lines    #
        #       65 and 69. Without that check, the range    #
        #       will vary and given incorrect results.      #
        #                                                   #
        #####################################################
        
        if user_guess - lower > upper - user_guess:
            print("Sorry, you guessed too high!")
            if user_guess - 1 < upper:
                upper = user_guess - 1
        else:
            print("Sorry, you guessed too low. :(")
            if user_guess + 1 > lower:
                lower = user_guess + 1
        guess_number += 1
        
    #########################################################
    #                                                       #
    #       At end of game, calculate `secret_number`       #
    #       using a random function (selecting a random     #
    #       value between `lower` and `upper`) to disguise  #
    #       the fact that we've been deceiving them.        #
    #                                                       #
    #########################################################
    
    print("You're all out of guesses!")
    secret_number = random.randrange(lower, upper + 1)
    print("The secret number was " + str(secret_number))
    print("Better luck next time! lol!")

if __name__ == "__main__":
    main()