#include <stdio.h>

#define NOBODY 0
#define X 1
#define O 2

char playerCharacters[3] = {'-', 'X', 'O'};

int takenSpots;

int checkVict(int board[3][3]);

void putPiece(int playerID, int board[3][3]);

void showBoard(int board[3][3]);

int main()
{
  int playerTurn, coordX, coordY;
  int board[3][3];

  playerTurn = 1;
  takenSpots = 0;

  for (coordX = 0; coordX < 3; coordX++)
    for (coordY = 0; coordY < 3; coordY++)
      board[coordX][coordY] = 0;

  while( (checkVict(board) ) == NOBODY && takenSpots < 9)
  {
    showBoard(board);
    putPiece(playerTurn, board);

    if (playerTurn == 1)
      playerTurn = 2;
    else
      playerTurn = 1;
  }

  showBoard(board);
  printf("El ganador es el jugador Nº%c!!!\n", playerCharacters[checkVict(board)]);
}

/*
* Checks for a player victory
*
* Param board: int array that is the game board
* Returns: Winner of the game: 1 - player 1; 2 - player 2; 0 - none;
**/
int checkVict(int board[3][3])
{
  int x, y;

  for (x=0; x<3; x++)
    if (board[x][0] == board[x][1] && board[x][1] == board[x][2])
      if (board[x][0] != NOBODY)
        return board[x][0];

  for (y=0; y<3; y++)
    if (board[0][y] == board[1][y] && board[1][y] == board[2][y])
      if (board[0][y] != NOBODY)
        return board[0][y];

  if (board[0][0] == board[1][1] && board[1][1] == board[2][2])
    if (board[0][0] != NOBODY)
      return board[0][0];

  if (board[0][2] == board[1][1] && board[1][1] == board[2][0])
    if (board[2][0] != NOBODY)
      return board[0][2];

  return NOBODY;
}

/*
* Puts a piece on the board
*
* Param board: int array that is the game board
* Param coordX & coordY: coordenates in the game board where the player puts the
*                        piece.
* Param playerID: int ID for the player 0 = none; 1 = player 1; 2 = player 2.
* Side effects: Sets the board in the specified location to the player ID
**/
void putPiece(int playerID, int board[3][3])
{
  int coordX;
  int coordY;

  printf("It's player %d's turn, please enter x and y for your piece.\n", playerID);
  scanf("%d %d", &coordX, &coordY);

  while (coordX > 3 || coordX < 0){
    printf("Invaid value please re enter X\n");
    scanf("%d", &coordX);
  }

  while (coordY > 3 || coordY < 0){
    printf("Invaid value please re enter Y\n");
    scanf("%d", &coordY);
  }

  coordX--; coordY--;

  if (takenSpots < 9)
  {
    if (board[coordX][coordY] == 0)
    {
      board[coordX][coordY] = playerID;
      takenSpots++;
    }
    else
    {
      printf("Tha place is used, give another coordenate!\n");
      putPiece(playerID, board);
    }
  }
}

void showBoard(int board[3][3])
{
  int x, y;
  for (x = 0; x<3; x++)
    for (y=0; y<3; y++)
    {
      printf("%c", playerCharacters[ board[x][y]] );
      if (y == 2)
        printf("\n");
    }
}