/*
 * Copyright (C) 1996-1997 Id Software, Inc.
 *
 * This program 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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 *
 */
// net_loop.c

#include "quakedef.h"
#include "net_loop.h"

qboolean      localconnectpending = false;
qsocket_t    *loop_client = NULL;
qsocket_t    *loop_server = NULL;

int Loop_Init (void) {
    if (cls.state == ca_dedicated)
        return -1;
    return 0;
}

void Loop_Shutdown (void) {
}

void Loop_Listen (qboolean state) {
}

void Loop_SearchForHosts (qboolean xmit) {
    if (!sv.active)
        return;

    hostCacheCount = 1;
    if (!strcmp (hostname.string, "UNNAMED"))
        Q_strcpy (hostcache[0].name, "local");
    else
        Q_strcpy (hostcache[0].name, hostname.string);
    Q_strcpy (hostcache[0].map, sv.name);
    hostcache[0].users = net_activeconnections;
    hostcache[0].maxusers = svs.maxclients;
    hostcache[0].driver = net_driverlevel;
    Q_strcpy (hostcache[0].cname, "local");
}

qsocket_t    *Loop_Connect (char *host) {
    if (strcmp (host, "local"))
        return NULL;

    localconnectpending = true;

    if (!loop_client) {
        if (!(loop_client = NET_NewQSocket ())) {
            Con_Printf ("Loop_Connect: no qsocket available\n");
            return NULL;
        }
        Q_strcpy (loop_client->address, "localhost");
    }
    loop_client->receiveMessageLength = 0;
    loop_client->sendMessageLength = 0;
    loop_client->canSend = true;
    loop_client->mod = MOD_ENGINE;
    loop_client->client_port = 0;

    if (!loop_server) {
        if (!(loop_server = NET_NewQSocket ())) {
            Con_Printf ("Loop_Connect: no qsocket available\n");
            return NULL;
        }
        Q_strcpy (loop_server->address, "LOCAL");
    }
    loop_server->receiveMessageLength = 0;
    loop_server->sendMessageLength = 0;
    loop_server->canSend = true;
    loop_server->mod = MOD_ENGINE;
    loop_server->client_port = 0;

    loop_client->driverdata = (void *) loop_server;
    loop_server->driverdata = (void *) loop_client;

    return loop_client;
}

qsocket_t    *Loop_CheckNewConnections (void) {
    if (!localconnectpending)
        return NULL;

    localconnectpending = false;
    loop_server->sendMessageLength = 0;
    loop_server->receiveMessageLength = 0;
    loop_server->canSend = true;
    loop_client->sendMessageLength = 0;
    loop_client->receiveMessageLength = 0;
    loop_client->canSend = true;

    return loop_server;
}

static int IntAlign (int value) {
    return (value + (sizeof (int) - 1)) & (~(sizeof (int) - 1));
}

int Loop_GetMessage (qsocket_t * sock) {
    int           ret;
    int           length;

    if (sock->receiveMessageLength == 0)
        return 0;

    ret = sock->receiveMessage[0];
    length = sock->receiveMessage[1] + (sock->receiveMessage[2] << 8);
    // alignment byte skipped here
    SZ_Clear (&net_message);
    SZ_Write (&net_message, &sock->receiveMessage[4], length);

    length = IntAlign (length + 4);
    sock->receiveMessageLength -= length;

    if (sock->receiveMessageLength)
        memcpy (sock->receiveMessage, &sock->receiveMessage[length], sock->receiveMessageLength);

    if (sock->driverdata && ret == 1)
        ((qsocket_t *) sock->driverdata)->canSend = true;

    return ret;
}

int Loop_SendMessage (qsocket_t * sock, sizebuf_t * data) {
    byte         *buffer;
    int          *bufferLength;

    if (!sock->driverdata)
        return -1;

    bufferLength = &((qsocket_t *) sock->driverdata)->receiveMessageLength;

    if ((*bufferLength + data->cursize + 4) > NET_MAXMESSAGE)
        Sys_Error ("Loop_SendMessage: overflow\n");

    buffer = ((qsocket_t *) sock->driverdata)->receiveMessage + *bufferLength;

    // message type
    *buffer++ = 1;

    // length
    *buffer++ = data->cursize & 0xff;
    *buffer++ = data->cursize >> 8;

    // align
    buffer++;

    // message
    memcpy (buffer, data->data, data->cursize);
    *bufferLength = IntAlign (*bufferLength + data->cursize + 4);

    sock->canSend = false;
    return 1;
}

int Loop_SendUnreliableMessage (qsocket_t * sock, sizebuf_t * data) {
    byte         *buffer;
    int          *bufferLength;

    if (!sock->driverdata)
        return -1;

    bufferLength = &((qsocket_t *) sock->driverdata)->receiveMessageLength;

    if ((*bufferLength + data->cursize + sizeof (byte) + sizeof (short)) > NET_MAXMESSAGE)
        return 0;

    buffer = ((qsocket_t *) sock->driverdata)->receiveMessage + *bufferLength;

    // message type
    *buffer++ = 2;

    // length
    *buffer++ = data->cursize & 0xff;
    *buffer++ = data->cursize >> 8;

    // align
    buffer++;

    // message
    memcpy (buffer, data->data, data->cursize);
    *bufferLength = IntAlign (*bufferLength + data->cursize + 4);
    return 1;
}

qboolean Loop_CanSendMessage (qsocket_t * sock) {
    if (!sock->driverdata)
        return false;
    return sock->canSend;
}

qboolean Loop_CanSendUnreliableMessage (qsocket_t * sock) {
    return true;
}

void Loop_Close (qsocket_t * sock) {
    if (sock->driverdata)
        ((qsocket_t *) sock->driverdata)->driverdata = NULL;
    sock->receiveMessageLength = 0;
    sock->sendMessageLength = 0;
    sock->canSend = true;
    if (sock == loop_client)
        loop_client = NULL;
    else
        loop_server = NULL;
}
