#include <stdio.h>

#include <structures.h>

// checks board for a win
// returns player number on win, otherwise 0
// x e y come cartesiani, rows e collums le dimensioni
int checkWin(tile_t *board, int x, int y, int rows, int collums) {
    int i;
	tile_t current = board[x + y * collums];

	// horrizontal
	for (i=0; i<4; i++) {
		if (x + i - 3 >= 0 && x + i < collums) {
			if (board[x + i - 3 + y * collums] == board[x + i + y * collums] &&
				board[x + i - 2 + y * collums] == board[x + i + y * collums] &&
				board[x + i - 1 + y * collums] == board[x + i + y * collums]) {
			
				return current;
			}
		}
	}

	// vertical
	for (i=0; i<4; i++) {
		if (y + i - 3 >= 0 && y + i < rows) {
			if (board[x + (y + i - 3) * collums] == board[x + (y + i) * collums] &&
				board[x + (y + i - 2) * collums] == board[x + (y + i) * collums] &&
				board[x + (y + i - 1) * collums] == board[x + (y + i) * collums]) {
			
				return current;
			}
		}
	}

	// diagonal
	for (i=0; i<4; i++) {
		if (y + i - 3 >= 0 && y + i < rows && x + i - 3 >= 0 && x + i < collums) {
			if (board[x - 3 + i + (y + i - 3) * collums] == board[x + i + (y + i) * collums] &&
				board[x - 2 + i + (y + i - 2) * collums] == board[x + i + (y + i) * collums] &&
				board[x - 1 + i + (y + i - 1) * collums] == board[x + i + (y + i) * collums]) {
			
				return current;
			}
		}
	}

	for (i=0; i<4; i++) {
		if (y + i - 3 >= 0 && y + i < rows && x + i - 3 >= 0 && x + i < collums) {
			if (board[x - 3 + i + (y - i + 3) * collums] == board[x + i + (y + i) * collums] &&
				board[x - 2 + i + (y - i + 2) * collums] == board[x + i + (y + i) * collums] &&
				board[x - 1 + i + (y - i + 1) * collums] == board[x + i + (y + i) * collums]) {
			
				return current;
			}
		}
	}
}