/*
 * jid.c
 * vim: expandtab:ts=4:sts=4:sw=4
 *
 * Copyright (C) 2012 - 2019 James Booth <boothj5@gmail.com>
 *
 * This file is part of Profanity.
 *
 * Profanity 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
 * (at your option) any later version.
 *
 * Profanity 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 Profanity.  If not, see <https://www.gnu.org/licenses/>.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link the code of portions of this program with the OpenSSL library under
 * certain conditions as described in each individual source file, and
 * distribute linked combinations including the two.
 *
 * You must obey the GNU General Public License in all respects for all of the
 * code used other than OpenSSL. If you modify file(s) with this exception, you
 * may extend this exception to your version of the file(s), but you are not
 * obligated to do so. If you do not wish to do so, delete this exception
 * statement from your version. If you delete this exception statement from all
 * source files in the program, then also delete it here.
 *
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>

#include <glib.h>

#include "common.h"
#include "xmpp/jid.h"

Jid*
jid_create(const gchar* const str)
{
    Jid* result = NULL;

    /* if str is NULL g_strdup returns NULL */
    gchar* trimmed = g_strdup(str);
    if (trimmed == NULL) {
        return NULL;
    }

    if (strlen(trimmed) == 0) {
        g_free(trimmed);
        return NULL;
    }

    if (g_str_has_prefix(trimmed, "/") || g_str_has_prefix(trimmed, "@")) {
        g_free(trimmed);
        return NULL;
    }

    if (!g_utf8_validate(trimmed, -1, NULL)) {
        g_free(trimmed);
        return NULL;
    }

    result = malloc(sizeof(struct jid_t));
    result->str = NULL;
    result->localpart = NULL;
    result->domainpart = NULL;
    result->resourcepart = NULL;
    result->barejid = NULL;
    result->fulljid = NULL;

    gchar* atp = g_utf8_strchr(trimmed, -1, '@');
    gchar* slashp = g_utf8_strchr(trimmed, -1, '/');
    gchar* domain_start = trimmed;

    if (atp) {
        result->localpart = g_utf8_substring(trimmed, 0, g_utf8_pointer_to_offset(trimmed, atp));
        domain_start = atp + 1;
    }

    if (slashp) {
        result->resourcepart = g_strdup(slashp + 1);
        result->domainpart = g_utf8_substring(domain_start, 0, g_utf8_pointer_to_offset(domain_start, slashp));
        char* barejidraw = g_utf8_substring(trimmed, 0, g_utf8_pointer_to_offset(trimmed, slashp));
        result->barejid = g_utf8_strdown(barejidraw, -1);
        result->fulljid = g_strdup(trimmed);
        g_free(barejidraw);
    } else {
        result->domainpart = g_strdup(domain_start);
        result->barejid = g_utf8_strdown(trimmed, -1);
    }

    if (result->domainpart == NULL) {
        jid_destroy(result);
        return NULL;
    }

    result->str = trimmed;

    return result;
}

Jid*
jid_create_from_bare_and_resource(const char* const barejid, const char* const resource)
{
    Jid* result;
    char* jid = create_fulljid(barejid, resource);
    result = jid_create(jid);
    free(jid);

    return result;
}

void
jid_destroy(Jid* jid)
{
    if (jid == NULL) {
        return;
    }

    g_free(jid->str);
    g_free(jid->localpart);
    g_free(jid->domainpart);
    g_free(jid->resourcepart);
    g_free(jid->barejid);
    g_free(jid->fulljid);
    free(jid);
}

gboolean
jid_is_valid_room_form(Jid* jid)
{
    return (jid->fulljid != NULL);
}

/*
 * Given a barejid, and resourcepart, create and return a full JID of the form
 * barejid/resourcepart
 * Will return a newly created string that must be freed by the caller
 */
char*
create_fulljid(const char* const barejid, const char* const resource)
{
    gchar* barejidlower = g_utf8_strdown(barejid, -1);
    GString* full_jid = g_string_new(barejidlower);
    g_free(barejidlower);
    g_string_append(full_jid, "/");
    g_string_append(full_jid, resource);

    char* result = strdup(full_jid->str);

    g_string_free(full_jid, TRUE);

    return result;
}

/*
 * Get the nickname part of the full JID, e.g.
 * Full JID = "test@conference.server/person"
 * returns "person"
 */
char*
get_nick_from_full_jid(const char* const full_room_jid)
{
    char** tokens = g_strsplit(full_room_jid, "/", 0);
    char* nick_part = NULL;

    if (tokens) {
        if (tokens[0] && tokens[1]) {
            nick_part = strdup(tokens[1]);
        }

        g_strfreev(tokens);
    }

    return nick_part;
}

/*
 * get the fulljid, fall back to the barejid
 */
char*
jid_fulljid_or_barejid(Jid* jid)
{
    if (jid->fulljid) {
        return jid->fulljid;
    } else {
        return jid->barejid;
    }
}

char*
jid_random_resource(void)
{
    char* rand = get_random_string(4);

    gchar* result = g_strdup_printf("profanity.%s", rand);
    free(rand);

    return result;
}