#define _POSIX_C_SOURCE 2 

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

#include <unistd.h>

#include "zpm.h"

/*
 * -g greater than
 * -l less than
 * -e equal
 * -L least : print least
 * -G greatest : print greatest
 * -q quiet: no print
 */
int main(int ac, char *av[]) {
	int cmp;
	char *a = 0, *b = 0;
	int print = 1;
	int argn, opt = 0;
	int inorder = 1, equal = 1;

	char *greatest = 0;
	char *least = 0;

	while ((opt = getopt(ac, av, "qLG")) != -1) {
		switch (opt) {
			case 'q': print = 0; break;
			case 'G': print = 2; break;
			case 'L': print = 3; break;
			default:
				  exit(EXIT_FAILURE);
				  break;
		}
	}

	argn = optind;

	if (ac > argn) {
		a = av[argn++];
		greatest = a;
		least = a;
	}

	while (ac > argn) {
		b = av[argn++];

		cmp = zpm_vercmp(a, b);
		switch (cmp) {
			case 0:
				break;
			case -1:
				equal = 0;
				break;
			case 1:
				equal = 0;
				inorder = 0;
				break;
			default:
				break;
		}
		
		cmp = zpm_vercmp(b, greatest);
		if (cmp > 0) {
			greatest = b;
		}

		cmp = zpm_vercmp(b, least);
		if (cmp < 0) {
			least = b;
		}
		a = b;
	}

	if (equal) {
		cmp = 0;
	} else if (inorder) {
		cmp = -1;
	} else {
		cmp = 1;
	}

	switch (print) {
		case 1:
			printf("%d\n", cmp);
			break;
		case 2:
			if (greatest) printf("%s\n", greatest);
			break;
		case 3:
			if (least) printf("%s\n", least);
			break;
		default:
			break;
	}

	return cmp == -1 ? 2 : cmp;
}