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/*************************************************************************************************
 *  Program Name: Guess My Number Game                                                           *
 *  Author:       Terry Weiss                                                                    *
 *  Date Written: 1/12/2016                                                                      *
 *************************************************************************************************
 *    This program runs the classic number guessing game. The computer guesses a number between  *
 *  1 and 100, and the player must then guess that number. The computer will tell the player if  *
 *  the guess is high or low, or if it's correct. The player may also decide to choose a number  *
 *  and have the computer try to guess it.
 *************************************************************************************************/
 
#include <cstdlib>
#include <ctime>
#include <iostream>
 
 
 
enum mainOption { GUESSER = 1, CHOOSER_DUMB, CHOOSER_SMART, EXIT };
 
 
const int MIN_GUESS = 1;
const int MAX_GUESS = 100;
const std::string PLAY_AGAIN_MSG = "\nThat was fun! Let's play again!\n";
 
 
int mainMenu();
void playGuesser();
void playChooser(bool smart);
 
 
 
int main() {
    std::srand(static_cast<unsigned int>(time(0)));
 
    int option;
    do {
        option = mainMenu();
 
        switch (option) {
            case GUESSER:
                playGuesser();
                break;
            case CHOOSER_DUMB:
                playChooser(false);
                break;
            case CHOOSER_SMART:
                playChooser(true);
                break;
            case EXIT:
                std::cout << "We should do this again some time!\n\n";
                break;
            default:
                std::cout << "**ERROR**: Invalid menu option  {" << option << "}\n\n";
        }
    } while (option != EXIT);
 
    return EXIT_SUCCESS;
}
 
 
 
int mainMenu() {
    int option;
 
 
    std::cout << "  1. Play as guesser\n"
              << "  2. Play as chooser\n"
              << "  3. Play as chooser (against smartest guesses)\n"
              << "  4. Exit\n";
 
    do {
        std::cout << "Please choose a game mode to begin: ";
        std::cin >> option;
 
        if (option < 1 || option > EXIT) {
            std::cout << "Invalid option. ";
        }
    } while (option < 1 || option > EXIT);
 
 
    return option;
}
 
 
void playGuesser() {
    int number = (std::rand() % (MAX_GUESS - MIN_GUESS + 1)) + MIN_GUESS;
    int guess, guesses = 0;
 
    std::cout << "\nOkay, I'm ready!" << std::endl;
 
    do { //Repeat until number is guessed correctly
        std::cout << "Please pick an integer between " << MIN_GUESS << " and " << MAX_GUESS << ": ";
        std::cin >> guess;
 
        if (guess < MIN_GUESS || guess > MAX_GUESS) {
            std::cout << "Sorry, invalid guess. ";
        }
        else {
            guesses++;
 
            if (guess < number) {
                std::cout << "No, that's too low." << std::endl;
            }
            else if (guess > number) {
                std::cout << "Sorry, that's too high." << std::endl;
            }
            else {
                std::cout << "Congrats, you got it!! It only took " << guesses << " guess"
                          << ((guesses == 1) ? "" : "es") << "." << std::endl; //pluralize "guesses"
            }
        }
    } while (guess != number);
 
    std::cout << PLAY_AGAIN_MSG;
}
 
void playChooser(bool smart) {
    enum resultOption { HIGH = 1, LOW, CORRECT };
 
    int guess, guesses = 0;
    int min, max;
    int result;
    bool cheater = false;
 
 
 
    std::cout << "\nAlrighty, pick a number between " << MIN_GUESS << " and " << MAX_GUESS
              << " but don't tell me!" << std::endl
              << "Hit any key when you're ready..." << std::endl;
    std::cin.get();
 
 
    min = MIN_GUESS;
    max = MAX_GUESS;
    do { //until the guess is right or it's determined the player is cheating
        if (smart) {
            guess = (max + min) / 2;
        }
        else {
            guess = std::rand() % (max - min + 1) + min;
        }
        guesses++;
 
        std::cout << "  1. Too high"  << std::endl
                  << "  2. Too low"   << std::endl
                  << "  3. Correct!"  << std::endl;
        do {
            std::cout << "Is it " << guess << "? ";
            std::cin >> result;
 
            if (result < 1 || result > CORRECT) {
                std::cout << "Invalid option. ";
            }
        } while (result < 1 || result > CORRECT);
 
        if (result == CORRECT) {
            std::cout << "Awesome! I got it right in " << guesses << " guesses." << std::endl;
        }
        else if (result == HIGH || result == LOW) {
            if (max == min) { //If it's the only option left, it can't be wrong.
                cheater = true;
            }
            else if (result == HIGH) {
                if (guess == min) { //It can't be lower than the min.
                    cheater = true;
                }
                else {
                    max = guess - 1;
                }
            }
            else if (result == LOW) {
                if (guess == max) { //It can't be higher than the max.
                    cheater = true;
                }
                else {
                    min = guess + 1;
                }
            }
 
            if (cheater) {
                std::cout << "Hmm, it seems like someone likes to cheat ;)" << std::endl
                          << "You had me going there for " << guesses << " guesses." << std::endl;
            }
        }
        else {
            std::cout << "**ERROR**: Invalid result. {" << result << "}" << std::endl;
        }
 
    } while (result != CORRECT && !cheater);
 
 
    std::cout << PLAY_AGAIN_MSG;
}