#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

typedef struct _circle{
	int num;
	struct _circle *prev;
} Circle;

//環状リストを用いたタイマー
//要は2->1->0->9がスムーズにできる
int main(int argc, char *argv[]){
	int cnt=0, i;
	if(argc != 2){
		printf("Error: Usage: ./timer n(second)\n");
		return 0;
	}
	cnt = atoi(argv[1]);

	Circle one[10], two[6], three[10], *p1, *p2, *p3;
	for(i=0; i<10; i++){
		if(i<6){
			two[i].num = i;
			two[i].prev = &two[(i+5)%6];
		}
		one[i].num = three[i].num = i;
		one[i].prev = &one[(i+9)%10];
		three[i].prev = &three[(i+9)%10];
	}

	//タイマーセット
	p1 = &one[cnt/60];
	p2 = &two[(cnt%60)/10];
	p3 = &three[(cnt%60)%10];
	while(cnt>0){
		printf("残り %d:%d%d\n", p1->num, p2->num, p3->num);
		sleep(1);
		if(p3->prev->num == 9){
			p2 = p2->prev;
			if(p2->num == 5){
				p1 = p1->prev;
			}
		}
		p3 = p3->prev;
		cnt--;
		printf("\033[1A");
	}
	printf("Time Up\a\n");
	return 1;
}