/* Programmer: Dylan McDonald
   Class & Section: CS 54, Section <n>
   Date: 25 September, 2007
   Purpose: Programatically play Blackjack using structs */ 

#include <iostream>
using namespace std;

struct card
{
  int rank; /* Let Ace = 1, Jack = 11, Queen = 12, and King = 13 */
  char suit; /* Let spades = 's', clubs = 'c', hearts = 'h', and diamonds = 'd' */
};

struct blackjack
{
  struct card first; /* first up card */
  struct card second; /* second up card */
};

int main()
{
  int  randRank, score = 0;
  char randSuit;
  bool hasAce = false;
  unsigned short whichCard;
  struct blackjack deal;
  struct card hitCard;
  
  /* seed the random numbers */
  srand(time(NULL));

  /* this for loop will do the heavy lifting in randomly choosing the
     rank & suit as well as scoring the hand without incessantly
     copying & pasting code */
  for (whichCard = 0; whichCard < 3 && score != -1; whichCard++)
  {
    /* randomly decide the rank & suit */
    randRank = rand() % 13 + 1;
    randSuit = rand() % 4;

    /* do some bookkeeping with the score of the first two cards */
    if (whichCard < 2)
    {
      switch (randRank)
      {
        case 1:
          /* ace */
          hasAce = true;
          score += 11;
          break;
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
        case 10:
          /* numbered cards */
          score += randRank;
          break;
        case 11:
        case 12:
        case 13:
          /* face cards */
          score += 10;
          break;
        default:
          /* invalid cards */
          score = -1;
          break;
      }
    }

    /* map the random suit range to an actual suit */
    switch (randSuit)
    {
      case 0:
        randSuit = 's';
        break;
      case 1:
        randSuit = 'c';
        break;
      case 2:
        randSuit = 'h';
        break;
      case 3:
        randSuit = 'd';
        break;
      default:
        randSuit = 'X';
        break;
    }

    /* change the first card */
    if (whichCard == 0)
    {
      deal.first.rank = randRank;
      deal.first.suit = randSuit;
    }
    /* change the second card */
    else if (whichCard == 1)
    {
      deal.second.rank = randRank;
      deal.second.suit = randSuit;
    }
    /* change the hit card */
    else if (whichCard == 2)
    {
      hitCard.rank = randRank;
      hitCard.suit = randSuit;
    }
  }

  cout << "You have a " << deal.first.rank << deal.first.suit
       << " " << deal.second.rank << deal.second.suit << endl;

  /* they had a pair of aces */
  if (score == 22)
    score = 12;
  cout << "You scored a " << score << endl;

  /* display hit card & finish calculating the score */
  cout << "Your hit card is a " << hitCard.rank << hitCard.suit << endl;
  switch (hitCard.rank)
  {
    case 1:
      /* ace */
      score += 11;
      break;
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
    case 8:
    case 9:
    case 10:
      /* numbered cards */
      score += randRank;
      break;
    case 11:
    case 12:
    case 13:
      /* face cards */
      score += 10;
      break;
    default:
      /* invalid cards */
      score = -1;
      break;
  }

  /* reward hands */
  if (deal.first.rank == 1 && deal.first.suit != 'd')
  {
    /* Ace King */
    if (deal.first.suit == 'd' && deal.second.rank == 13 &&
        deal.second.suit == 'd')
      cout << "Congratulations! You have a free meal at Clayton's cafteria!"
           << endl;

    /* Ace Queen */
    if (deal.first.suit == 'c' && deal.second.rank == 12 &&
        deal.second.suit == 'd')
      cout << "The evil Ace Queen has struck again! Your luck has ran out. "
           << "Goodbye!" << endl;

    /* Ace Jack */
    if (deal.first.suit == 's' && deal.second.rank == 11 &&
        deal.second.suit == 's')
      cout << "The one and only \"Blackjack\"; give this guy more money!"
           << endl;
  }

  /* if they hit a soft ace and went broke, we can deduct 10
  OR if they hit and went broke, but received an ace, we can deduct 10 */
  if ((score > 21 && hasAce) || (score > 21 && !hasAce && hitCard.rank == 1))
    score -= 10;
  cout << "After hitting, You scored a " << score << endl;
  
  /* maybe they shouldn't have hit? */
  if (score > 21)
    cout << "So who here didn't take a hit when they realised their Blackjack "
         << "score exceeded their IQ? You are the weakest link. Goodbye."
         << endl;

  return 0;
}