// Design a Blackjack game, selecting cards randomly both for the guest and the
// banker. Print the value of both the hands and the winner.
// Author:rahule@cse.iitk.ac.in


#include<stdio.h>
#include<stdlib.h>

void display(int r,char*s) ;
int main()
{
  int card_deck[13]={0,0,0,0,0,0,0,0,0,0,0,0,0};//Array for keeping a count of each card drawn.This is to ensure that same card isnot drawn more than once
  int r,score,score_bank;
  char c[2],x;
  printf("\n Please input a random integer for random number generation");
  scanf("%d",&r);
  srand(r);//Used for seeding the random generator function rand() so that it generated different set of random number at each execution of the program
  score=0;
  printf("\nStarting the game");
  while(1)
    {r=rand()%13;//Optain a random number in the range 0-12.Now on consider 0 as card number 2,1 as card number 3......8 as card number 10,9 as JACK...and finally 12 as an ACE
      card_deck[r]++;
      if(card_deck[r]>4)//Checking whether the randomly generated card has already appeared 4 times.If it has then discard and generate a new card.
	{continue;
	}
      if(r>=0&&r<=7)
	{score=score+r+2;
	}
      if(r>=8&&r<=11)
	{score=score+10;
	}
      if(r==12&&card_deck[r]==1)//If the card is an ACE and it is appearing for the first time add 11
	{score=score+11;
	  if(score>21)//After adding 11 if the score goes above 21 consider the ace as 1.
	    {score=score-10;
	    }
	}
      if(r==12&&card_deck[r]==2)//If the card is an ACE and it is appearing for the second time consider it as 1 and subtract 10 to consider the previous ace as 1
	{score=score-10+1;
     
	}
      if(r==12&&card_deck[r]>2)//If the card is an ACE and it is appearing for the third or fourth time consider it as 1 
	{score=score+1;
	}
      display(r,"You");//Function to display the card which you have drawn
      printf("\n Your score is %d",score);
      if(score>21)//checking whether you are busted or not.If yes then the bank wins 
	{ printf("\n You are busted \n Bank Wins");return 0;
	} 
      printf("\n Do you want to draw another card?(y/n)");
      
      scanf("%s",c);
      if(c[0]=='n'||c[0]=='N')
	break;
    }
  printf("\nBank is going to play");
  score_bank=0;
  while(score_bank<16)//Bank will play till its score is above 16.The remaining logic of the game remains the same as that of the player. 
    {r=rand()%13;
      card_deck[r]++;
      if(card_deck[r]>4)
	{continue;
	}
      if(r>=0&&r<=7)
	{score_bank=score_bank+r+2;
	}
      if(r>=8&&r<=11)
	{score_bank=score_bank+10;
	}
      if(r==12&&card_deck[r]==1)
	{score_bank=score_bank+11;
	  if(score_bank>21)
	    {score_bank=score_bank-10;
	    }
         
	}
      if(r==12&&card_deck[r]==2)
	{score_bank=score_bank-10+1;
        }
      if(r==12&&card_deck[r]>2)
	{score_bank=score_bank+1;
	}
      display(r,"Bank");
      printf("\n Bank's score is %d",score_bank);
      if(score_bank>21)
	{ printf("\n Bank busted \n You Win");return 0;
	} 
      if(score_bank>score)
	{printf("\nBank wins");return 0;}
    }
  if(score>score_bank)
    printf("\nYou win\n");     
  return 0;
}

void display(int r,char *s) 
{
  switch(r)
    {
    case 0:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 1:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 2:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 3:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 4:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 5:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 6:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 7:
      printf("\n %s  drawn a %d",s,r+2);
      break;           
    case 8:
      printf("\n %s  drawn a %d",s,r+2);
      break;
    case 9:
      printf("\n %s  drawn a JACK ",s);
      break;      
    case 10:
      printf("\n %s  drawn a QUEEN",s);
      break;
    case 11:
      printf("\n %s  drawn a KING",s);
      break;
    case 12:
      printf("\n You have drawn an ACE",s);
      break;
    }
  return;
}