#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, pass, failed = 0;

	/* 0x1 = less than, 0x2 = equal, 0x4 = greater */
	unsigned testmask = 0;
	unsigned testcases = 0;

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

	if (ac < 2) return 1;

	while ((opt = getopt(ac, av, "qgleLG")) != -1) {
		switch (opt) {
			case 'q': print = 0; break;
			case 'l': testmask |= 0x1; break;
			case 'e': testmask |= 0x2; break;
			case 'g': testmask |= 0x4; break;
			case 'L': print = 2; break;
			case 'G': 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) + 1;
		testcases |= (1<<cmp);
		
		if (testmask) {
			pass = (testmask & (1 << cmp));
			if (!pass) {
				failed++;
			}
		}

		cmp = zpm_vercmp(greatest, b);
		if (cmp > 0) {
			greatest = b;
		}

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

	switch (testcases) {
		case 0: /* no tests */
			cmp = 0; break;
		case 1: /* only less than */
			cmp = 2; break;
		case 2: /* only equal */
			cmp = 0; break;
		case 4: /* only greater than */
			cmp = 1; break;
		default: /* mixed */
			cmp = 3; break;
	}

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

	if (testmask == 0) {
		return cmp;
	} else {
		return failed ? 1 : 0;
	}
}