#include <stdio.h>
#include "robust.h"

int main()
{
	char buf[BUFSIZ];
	char *b;
	struct {
		QTICKET qptr;
		int inuse;
	} store[100];
	int i, j;

	for(i = 0; i < 100; i++)
		store[i].inuse = 0;

	while(printf("> "), fgets(buf, BUFSIZ-1, stdin) != NULL){
		for(b = buf; isspace(*b); b++)
			;
		switch(*b++){
		case 'c': 
			for(i = 0; i < 100 && store[i].inuse; i++)
				;
			if (i == 100)
				printf("All queues in use.\n");
			else if (QE_ISERROR(j = create_queue()))
				printf("%s\n", qe_errbuf);
			else{
				store[i].qptr = j;
				store[i].inuse = 1;
				printf("Queue %d created\n", i);
			}
			break;
		case 'd':
			if (sscanf(b, "%d", &i) != 1)
				printf("delete: d <queuenumber>\n");
			else if (i < 0 || 99 < i)
				printf("Bad queue number %d\n", i);
			else if (QE_ISERROR(delete_queue(store[i].qptr)))
				printf("%s\n", qe_errbuf);
			else{
				store[i].inuse = 0;
				printf("Queue %d deleted\n", i);
			}
			break;
		case '+':
			if (sscanf(b, "%d %d", &i, &j) != 2)
				printf("enqueue: + <queuenumber> <integer>\n");
			else if (i < 0 || 99 < i)
				printf("Bad queue number %d\n", i);
			else if (QE_ISERROR(put_on_queue(store[i].qptr, j)))
				printf("%s\n", qe_errbuf);
			else
				printf("Put %d on queue %d\n", j, i);
			break;
		case '-':
			if (sscanf(b, "%d", &i) != 1)
				printf("dequeue: - <queuenumber>\n");
			else if (i < 0 || 99 < i)
				printf("Bad queue number %d\n", i);
			else{
				qe_errbuf[0] = '\0';
				j = take_off_queue(store[i].qptr);
				if (qe_errbuf[0])
					printf("%s\n", qe_errbuf);
				else
					printf("Took %d off queue %d\n", j, i);
			}
			break;
		case 'l':
			for(i = 0; i < 100; i++)
				if (store[i].inuse)
					printf("queue %2d in use\n", i);
			break;
		default:
			printf("help:\n");
			printf("c		create queue\n");
			printf("d n		delete queue n\n");
			printf("+ n v		add integer v to queue n\n");
			printf("- n		remove head of queue n\n");
			printf("EOF		quit\n");
			break;
		}
	}
	putchar('\n');
}