/* An object-oriented version of "Master-Mind."  Now, the game is
   bundled up into "Class."  The class has two variables -- "answer,"
   which is the answer, and "nguesses", which is the number of guesses
   that the user has made.  There is a method, "play_game()", which is
   how you play a game, and two other methods: "get_legal_guess()," where
   the user is repeatedly prompted to make a guess until he/she makes a 
   legal guess, and "is_legal_answer(n)", which takes on parameter, n, and
   returns whether it is legal.  Note, now the main() function does very little.

   Note also the syntax of implementing the methods.
 */

#include <iostream>
using namespace std;

class MasterMind {
  public:
    int is_legal_answer(int n);
    int get_legal_guess();
    void play_game();
  private:
    int answer;
    int nguesses;
};

int MasterMind::get_legal_guess()
{
  int guess;

  while(1) {
    cout << "Player 2: Make a guess, please: ";
    cin >> guess;
    if (is_legal_answer(guess)) return guess;
    cout << guess << " is not a legal answer.  ";
  }
}

/* This checks to see whether n is a legal answer -- that is,
   is it between 0 and 999, and does it have no repeated digits? */

int MasterMind::is_legal_answer(int n)
{
  int dr, dl, dm;

  if (n < 0 || n > 999) return 0;

  dr = n % 10;
  dl = n / 100;
  dm = (n / 10) % 10;
  
  if (dl == dr || dl == dm || dm == dr) return 0;
  
  return 1;

}
 
/* Note that play_game now uses a do/while loop to have player one enter the answer */

void MasterMind::play_game()
{
  int guess;
  int right;
  int dr, dm, dl;
  int ar, am, al;
  int correct_number;
  int correct_position;

  do {
    cout << "Player 1 -- Enter an answer: ";
    cin >> answer;

    if (!is_legal_answer(answer)) {
      cout << "Not a legal answer\n";
    }
  } while (!is_legal_answer(answer));

  ar = answer % 10;
  al = answer / 100;
  am = (answer / 10) % 10;

  nguesses = 1;

  while (1) {

    guess = get_legal_guess();

    if (guess == answer) {
      cout << "Right!  You took " << nguesses << " move";
      if (nguesses != 1) cout << "s" ;
      cout << "." << endl;
      return;
   } else {

      dr = guess % 10;
      dl = guess / 100;
      dm = (guess / 10) % 10;

      correct_position = 0;
      if (dr == ar) correct_position++;
      if (dl == al) correct_position++;
      if (dm == am) correct_position++;
        
      correct_number = 0;
      if (dr == ar || dr == am || dr == al) correct_number++;
      if (dm == ar || dm == am || dm == al) correct_number++;
      if (dl == ar || dl == am || dl == al) correct_number++;

      cout << "Correct position: " << correct_position << endl;
      cout << "Correct number:   " << correct_number << endl;
    }
    nguesses++;
  } 
   
  return;
}

int main()
{
  MasterMind game;

  game.play_game();

  return 0;
}