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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include <sys/select.h>
#include <sys/time.h>
#include <unistd.h>
#include <assert.h>
#include "termio.h"
#define WID 10
#define HEI 22
int delay_msec=700;
const int stones[7]={
0b0000000001110001,
0b0000000001110100,
0b0000000000110011,
0b0000000000110110,
0b0000000001110010,
0b0000000001100011,
0b0000000000001111,
};
static int rotateR(int bl){
int dest=0;
for(int y=0;y<4;y++){
for(int x=0;x<4;x++){
dest|=(!!(bl&(1<<(4*y+x))))<<(4*x+3-y);
}
}
return dest;
}
static int rotateL(int bl){
return rotateR(rotateR(rotateR(bl)));
}
struct board {
int lines[HEI];
int stone,stx,sty;
};
static void persist(struct board *bd){
// fprintf(stderr,"persist: stone=%d\n",bd->stone);
// usleep(1000000);
for(int y=0;y<4;y++){
for(int x=0;x<4;x++){
bd->lines[bd->sty+y]|=(!!(bd->stone&(1<<(4*y+x))))<<(bd->stx+x);
}
}
}
static void spawn(struct board *bd){
int idx=rand()%7;
// fprintf(stderr,"%d\n",idx);
// usleep(1000000);
bd->stone=stones[idx];
bd->stx=WID/2-1;
bd->sty=0;
}
static void show(const struct board *bd){
struct board bd2;
memcpy(&bd2,bd,sizeof bd2);
persist(&bd2);
printf("\x1B[H\x1B[2J");
for(int y=0;y<HEI;y++){
putchar('|');
for(int x=0;x<WID;x++){
if(bd2.lines[y]&(1<<x))printf("█");
else putchar(' ');
}
putchar('|');
putchar('\n');
}
putchar('+');
for(int x=0;x<WID;x++){
putchar('-');
}
putchar('+');
putchar('\n');
fflush(stdout);
}
static bool boardvalid(const struct board *bd){
for(int y=0;y<4;y++){
for(int x=0;x<4;x++){
if((bd->stone&(1<<(4*y+x)))){
if(bd->sty+y>=HEI)return false;
if(bd->stx+x<0||bd->stx+x>=WID)return false;
}
if(bd->lines[bd->sty+y]&((!!(bd->stone&(1<<(4*y+x))))<<(bd->stx+x)))return false;
}
}
return true;
}
static void advance(struct board *bd){
fprintf(stderr,"advance: stone=%d\n",bd->stone);
if(bd->stone==0){
spawn(bd);
return;
}
bd->sty++;
if(!boardvalid(bd)){
bd->sty--;
persist(bd);
spawn(bd);
return;
}
}
static void move(struct board *bd,int dir){
bd->stx+=dir;
if(!boardvalid(bd)){
bd->stx-=dir;
return;
}
}
static void rotR(struct board *bd){
int st=bd->stone;
bd->stone=rotateR(bd->stone);
if(!boardvalid(bd))bd->stone=st;
}
int main(void){
srand(time(NULL));
initkeyboard(false);
atexit(endkeyboard);
struct board bd;
memset(&bd,0,sizeof bd);
show(&bd);
struct timeval timeleft;
timeleft.tv_sec=0;
timeleft.tv_usec=0;
while(true){
show(&bd);
struct timeval start;
gettimeofday(&start,NULL);
fd_set inset;
FD_ZERO(&inset);
FD_SET(0,&inset);
struct timeval timeout;
memcpy(&timeout,&timeleft,sizeof timeout);
int ret=select(1,&inset,NULL,NULL,&timeout);
assert(ret>=0);
struct timeval end;
gettimeofday(&end,NULL);
if(ret==0){
advance(&bd);
timeleft.tv_sec=delay_msec/1000;
timeleft.tv_usec=delay_msec%1000*1000;
continue;
}
end.tv_sec-=start.tv_sec;
end.tv_usec-=start.tv_usec;
if(end.tv_usec<0){
end.tv_sec--;
end.tv_usec+=1000000;
}
timeleft.tv_sec-=end.tv_sec;
timeleft.tv_usec-=end.tv_usec;
if(timeleft.tv_usec<0){
timeleft.tv_sec--;
if(timeleft.tv_sec<0){
timeleft.tv_sec=timeleft.tv_usec=0;
} else {
timeleft.tv_usec+=1000000;
}
}
assert(FD_ISSET(0,&inset));
int key=tgetkey();
if(key=='Q'||key=='q')break;
else if(key=='S'||key=='s'||key==KEY_DOWN){
advance(&bd);
timeleft.tv_sec=delay_msec/1000;
timeleft.tv_usec=delay_msec%1000*1000;
} else if(key=='A'||key=='a'||key==KEY_LEFT)move(&bd,-1);
else if(key=='D'||key=='d'||key==KEY_RIGHT)move(&bd,1);
else if(key=='W'||key=='w'||key==KEY_UP)rotR(&bd);
else bel();
}
}
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