#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <math.h>

void initMatrix();
void newNumber(int*);
void cloneMat(void*,void*);
void printMat();
char *ctrAlign(int, char, char*);
bool isFree(int, int, int*);
char *my_itoa(int);

int matrix[4][4];

void initMatrix(){
	int x,y;
	for (x=0; x<4; x++){
		for(y=0; y<4; y++){
			matrix[x][y] = 0;
		}
	}
}

char *my_itoa(int i){
	char *a;
	sprintf(a, "%d", i);
	return a;
}

void newNumber(int * mat){
	int x, y, n;
	do {
		srand(time(NULL));
		x = rand() % 4;
		srand(time(NULL));
		y = rand() % 4;
	} while (!isFree(x, y, mat));
	srand(time(NULL));
	n = rand() % 10;
	mat[x][y] = n<8? 2: 4;
}

void cloneMat (void * desMat, void * srcMat){
	memcpy(desMat, srcMat, sizeof(srcMat));
}

bool isFree(int x, int y, int * mat){
	if(mat[x][y]){
		return true;
	}
	return false;
}

char *ctrAlign(int space, char spacer, char *text ){
	int i,l, s;
	char * string;
	string = malloc((space+1)*sizeof(char));
	for (i=0; i<space; i++){
		string[i] = spacer;
	}
	string[i]='\0';
	l = strlen(text);
	i=0;
	for (s=floor(space/2-l/2); i<l; s++){
		string[s] = text[i];
		i++;
	}
	return string;
}

void printMat(){
	int x,y;
	for(x=0;x<4;x++){
		printf("+-----+-----+-----+-----+\n");
		printf("|     |     |     |     |\n");
		printf("|     |     |     |     |\n");
		for(y=0;y<4;y++){
			printf("|%s", ctrAlign(5, ' ', my_itoa(matrix[x][y])));
		}
		printf("|\n");
		printf("|     |     |     |     |\n");
		printf("|     |     |     |     |\n");

	}
	printf("+-----+-----+-----+-----+\n");
}

int main(int argc, char *argv[]) {
	initMatrix();
	newNumber(matrix);
	system("clear");
	printMat();
}