/*
 *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
 *  Copyright (c) 2019, 2020 Alex-David Denes
 *
 *  uIRC is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  uIRC is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with uIRC.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "../errors.h"  // ERR_UIRC_*
#include "../types.h"   // IRC_Tag
#include "assemblers.h" // Assm_user()

#include <assert.h>  // assert()
#include <stdbool.h> // bool
#include <stddef.h>  // size_t
#include <stdio.h>   // NULL

signed long
uirc_assembler_tag(char* buf, const IRC_Tag* t, size_t len)
{
	assert(buf != NULL);
	assert(t != NULL);
	assert(t->key != NULL);

	char* const sv = buf;
	int         res;

	if (t->clientbound) {
		if (len > 1) {
			*(buf++) = '+';
			len--;
		} else
			return UIRC_ERR_BUFFER_FULL;
	}

	if (len < 1) return UIRC_ERR_BUFFER_FULL;
	if ((res = snprintf(buf, len, "%s", t->key)) >= 0) {
		buf += (size_t) res;
		len -= (size_t) res;
	} else
		return UIRC_ERR_BUFFER_ERR;

	if (t->value != NULL) {
		if (len < 1) return UIRC_ERR_BUFFER_FULL;
		if ((res = snprintf(buf, len, "=%s", t->value)) >= 0) {
			buf += (size_t) res;
			len -= (size_t) res;
		} else
			return UIRC_ERR_BUFFER_ERR;
	}

	return buf - sv;
}