/*!
 * message.cpp
 *
 * Copyright (c) 2015, NADAL Jean-Baptiste. All rights reserved.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 * 
 * @Author:  NADAL Jean-Baptiste
 * @Date: 19/03/2015
 *
 */


/*-------------------------------- INCLUDES ---------------------------------*/

#include <stdarg.h>

#include "message.h"

/*-------------------------------- GLOBALE ---------------------------------*/

static struct message_t gMessages[MAX_MESSAGES];  // Ringbuffer for messages
static long gLast_message_id;

static struct message_t *new_message (void);


/*!  ----------------------------------------------------------------------------
 *  @fn send_server_message
 *
 *  @brief  TODO
 */
void send_server_message (const char *fmt, ...)
{
	va_list ap;
	struct message_t *message;

    pthread_rwlock_wrlock (&gRwlock);
    message = new_message ();
    message->user[0] = '\0';  // Empty user indicates server message
    va_start (ap, fmt);
    vsnprintf(message->text, sizeof (message->text), fmt, ap);
    va_end (ap);

    pthread_rwlock_unlock (&gRwlock);
}


/*!  ----------------------------------------------------------------------------
 *  @fn new_message
 *
 *  @brief  Allocate new message. Caller must hold the lock.
 */
static struct message_t *new_message (void)
{
    static int size = sizeof (gMessages) / sizeof (gMessages[0]);
    struct message_t *message = &gMessages[gLast_message_id % size];
    message->id = gLast_message_id++;
    message->timestamp = time(0);
    return message;
}
