/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*

 * Copyright (C) 2003 Imendio AB 

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation; either version 2 of the

 * License, or (at your option) any later version.

 *

 * This program 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this program; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#include <config.h>

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <glib.h>

#ifndef G_OS_WIN32

#include <unistd.h>

#endif

#ifdef HAVE_IDN

#include <stringprep.h>

#include <punycode.h>

#include <idna.h>

#endif

#include "lm-internals.h"

#include "lm-utils.h"

LmCallback *

_lm_utils_new_callback (gpointer func, 

			gpointer user_data,

			GDestroyNotify notify)

{

	LmCallback *cb;

	cb = g_new0 (LmCallback, 1);

	cb->func = func;

	cb->user_data = user_data;

	cb->notify = notify;

	return cb;

}

void

_lm_utils_free_callback (LmCallback *cb)

{

	if (!cb) {

		return;

	}

	if (cb->notify) {

		(* cb->notify) (cb->user_data);

	}

	g_free (cb);

}

gchar *

_lm_utils_generate_id (void)

{

	static guint  last_id = 0;

	GTimeVal      tv;

	glong         val;

	g_get_current_time (&tv);

	val = (tv.tv_sec & tv.tv_usec) + last_id++;

	return g_strdup_printf ("%ld%ld", val, tv.tv_usec);

}

gchar * 

_lm_utils_base64_encode (const gchar *s)

{

	static const gchar *base64chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	guint    i, j;

	guint32  bits = 0;

	guint    maxlen = (strlen(s) * 2) + 3;

	gchar   *str;

	str = g_malloc(maxlen);

	j = 0;

	for (i = 0; i < strlen(s); i++) {

		bits <<= 8;

		bits |= s[i] & 0xff;

		if (!((i+1) % 3)) {

			guint indices[4];

			indices[0] = (bits >> 18) & 0x3f;

			indices[1] = (bits >> 12) & 0x3f;

			indices[2] = (bits >> 6) & 0x3f;

			indices[3] = bits & 0x3f;

			bits = 0;

			str[j++] = base64chars[(indices[0])];

			str[j++] = base64chars[(indices[1])];

			str[j++] = base64chars[(indices[2])];

			str[j++] = base64chars[(indices[3])];

		}

	}

	if (j + 4 < maxlen) {

		if ((i % 3) == 1) {

			guint indices[2];

			indices[0] = (bits >> 2) & 0x3f;

			indices[1] = (bits << 4) & 0x3f;

			str[j++] = base64chars[(indices[0])];

			str[j++] = base64chars[(indices[1])];

			str[j++] = '=';

			str[j++] = '=';

		} else if ((i % 3) == 2) {

			guint indices[3];

			indices[0] = (bits >> 10) & 0x3f;

			indices[1] = (bits >> 4) & 0x3f;

			indices[2] = (bits << 2) & 0x3f;

			str[j++] = base64chars[(indices[0])];

			str[j++] = base64chars[(indices[1])];

			str[j++] = base64chars[(indices[2])];

			str[j++] = '=';

		}

	}

	str[j] = '\0';

	return str;

}

gchar*

_lm_utils_hostname_to_punycode (const gchar *hostname)

{

#ifdef HAVE_IDN

	char *s;

	uint32_t *q;

	int rc;

	gchar *result;

	q = stringprep_utf8_to_ucs4 (hostname, -1, NULL);

	if (q == NULL) {

		return g_strdup (hostname);

	}

	rc = idna_to_ascii_4z (q, &s, IDNA_ALLOW_UNASSIGNED);

	free(q);

	if (rc != IDNA_SUCCESS) {

		return g_strdup (hostname);

	}

	/* insures result is allocated through glib */

	result = g_strdup(s);

	free(s);

	return result;

#else

	return g_strdup(hostname);

#endif

}

/**

 * lm_utils_get_localtime:

 * @stamp: An XMPP timestamp

 *

 * Converts an XMPP timestamp to a struct tm showing local time.

 * 

 * Return value: The local time struct.

 **/

struct tm *

lm_utils_get_localtime (const gchar *stamp)

{

	struct tm tm;

	time_t    t;

	gint      year, month;

	g_return_val_if_fail (stamp != NULL, NULL);

	/* 20021209T23:51:30 */

	sscanf (stamp, "%4d%2d%2dT%2d:%2d:%2d", 

		&year, &month, &tm.tm_mday, &tm.tm_hour,

		&tm.tm_min, &tm.tm_sec);

	tm.tm_year = year - 1900;

	tm.tm_mon = month - 1;

	tm.tm_isdst = -1;

 	t = mktime (&tm);

#if defined(HAVE_TM_GMTOFF)

	t += tm.tm_gmtoff;

#elif defined(HAVE_TIMEZONE)

	t -= timezone;

	if (tm.tm_isdst > 0) {

		t += 3600;

	}

#endif	

	return localtime (&t);

}