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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <termios.h>
#include <unistd.h>
int st[1<<7], lo, li, ls;
int m, pt, n, pl, t;
char nf;
struct termios t1, t2;
int cond (int j){
return t? j/n : j%n;
}
void clean(char *str){
if (str) printf("%s\n", str);
tcsetattr(0, TCSANOW, &t1);
exit(0);
}
int dash(int i){
return i?
putchar('-') + dash(i-1):0;
}
int line(int i){
return putchar('+') + (i ?
dash(6)+ line(i-1):
putchar(10));
}
int valid_move(){
int i;
for (i=0; i<n*n - 1; i++){
if ((i%n < n-1 && st[i]==st[i+1]) || (i/n < n-1 && st[i] == st[i+n]))
return 1;
}
return 0;
}
void print_state(){
int i, j,v;
printf("\033[2J\033[1;1HScore: %d\n", pt);
line(n);
for (i=0; i<n; i++){
printf("|");
for(j=0; j<n; j++){
v=st[n*i+j];
if (v > 0)
printf("%5d |", 1<<v);
else printf(" |");
}
printf("\n");
}
line(n);
}
void set_rnd(){
int i;
while(nf){
i = rand();
if (!st[i%(n*n)]){
st[i%(n*n)] = 1 + (i%8==0);
if (! --nf) break;
return;
}
}
if (!valid_move()){
print_state();
clean("no more moves");
}
}
void shift(int j){
int num_empty=0;
do{
if (! st[j]) /* empty*/
num_empty -= li;
else if (num_empty){
st[j + num_empty] = st[j];
st[j] ^= st[j];
}
j += li;
} while (j >= 0 && cond(j) != ls);
}
void merge(int j){
do {
if (st[j] && st[j] == st[j-li]){
st[j-li] += 1;
if (st[j-li] == 11) pl ^= pl;
pt += 1<<st[j-li];
st[j] ^= st[j];
nf ++;
}
j += li;
} while( j>= 0 && cond(j) != ls);
}
void update(){
int i;
for(i =0; i<n; i++){
shift(m * i + lo);
merge(m * i + lo + li);
shift(m * i + lo);
}
}
int main(int argc, char *argv[]){
srand(time(NULL));
//srand(12345);
n = 4;
if (argc > 1) n = atoi(argv[1]);
nf = n * n;
tcgetattr(0, &t1);
t2 = t1;
t2.c_lflag &= ~(ICANON | ECHO);
tcsetattr(0, TCSANOW, &t2);
set_rnd();
pt = 0;
pl = 1;
while(pl){
//pr_st();
set_rnd();
print_state();
switch(getchar()){
case 'l':
lo = ls = n-1;
li = -1;
m = n;
t = 0;
break;
case 'h':
lo = ls = 0;
li = 1;
m = n;
t = 0;
break;
case 'j':
lo = n * (n-1);
li = -n;
ls = -1;
m = 1;
t=1;
break;
case 'k':
lo = 0;
li = ls = n;
m = 1;
t=1;
break;
case 'q':
clean("Thanks!");
}
update();
}
print_state();
clean("you won!");
}
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