/*
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.

*/
#include <sys/types.h>
#include "qwsvdef.h"

#ifdef NeXT
#include <libc.h>
#endif

#if defined(__linux__) || defined(sun)
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <errno.h>
#else
#include <sys/dir.h>
#endif

cvar_t  sys_nostdout = {"sys_nostdout","0"};
cvar_t  sys_extrasleep = {"sys_extrasleep","0"};

qboolean  stdin_ready;

/*
===============================================================================

        REQUIRED SYS FUNCTIONS

===============================================================================
*/

/*
============
Sys_FileTime

returns -1 if not present
============
*/
int Sys_FileTime (char *path)
{
  struct  stat  buf;
  
  if (stat (path,&buf) == -1)
    return -1;
  
  return buf.st_mtime;
}


/*
============
Sys_mkdir

============
*/
void Sys_mkdir (char *path)
{
  if (mkdir (path, 0777) != -1)
    return;
  if (errno != EEXIST)
    Sys_Error ("mkdir %s: %s",path, strerror(errno)); 
}


/*
================
Sys_DoubleTime
================
*/
double Sys_DoubleTime (void)
{
  struct timeval tp;
  struct timezone tzp;
  static int    secbase;

  gettimeofday(&tp, &tzp);
  
  if (!secbase)
  {
    secbase = tp.tv_sec;
    return tp.tv_usec/1000000.0;
  }
  
  return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
}

/*
================
Sys_Error
================
*/
void Sys_Error (char *error, ...)
{
  va_list   argptr;
  char    string[1024];
  
  va_start (argptr,error);
  vsprintf (string,error,argptr);
  va_end (argptr);
  printf ("Fatal error: %s\n",string);
  
  exit (1);
}

/*
================
Sys_Printf
================
*/
void Sys_Printf (char *fmt, ...)
{
  va_list   argptr;
  static char   text[2048];
  unsigned char   *p;

  va_start (argptr,fmt);
  vsprintf (text,fmt,argptr);
  va_end (argptr);

  if (strlen(text) > sizeof(text))
    Sys_Error("memory overwrite in Sys_Printf");

    if (sys_nostdout.value)
        return;

  for (p = (unsigned char *)text; *p; p++) {
    *p &= 0x7f;
    if ((*p > 128 || *p < 32) && *p != 10 && *p != 13 && *p != 9)
      printf("[%02x]", *p);
    else
      putc(*p, stdout);
  }
  fflush(stdout);
}


/*
================
Sys_Quit
================
*/
void Sys_Quit (void)
{
  exit (0);   // appkit isn't running
}

static int do_stdin = 1;

/*
================
Sys_ConsoleInput

Checks for a complete line of text typed in at the console, then forwards
it to the host command processor
================
*/
char *Sys_ConsoleInput (void)
{
  static char text[256];
  int   len;

  if (!stdin_ready || !do_stdin)
    return NULL;    // the select didn't say it was ready
  stdin_ready = false;

  len = read (0, text, sizeof(text));
  if (len == 0) {
    // end of file
    do_stdin = 0;
    return NULL;
  }
  if (len < 1)
    return NULL;
  text[len-1] = 0;  // rip off the /n and terminate
  
  return text;
}

/*
=============
Sys_Init

Quake calls this so the system can register variables before host_hunklevel
is marked
=============
*/
void Sys_Init (void)
{
  Cvar_RegisterVariable (&sys_nostdout);
  Cvar_RegisterVariable (&sys_extrasleep);
}

/*
=============
main
=============
*/
void main(int argc, char *argv[])
{
  double      time, oldtime, newtime;
  quakeparms_t  parms;
  fd_set  fdset;
  extern  int   net_socket;
    struct timeval timeout;
  int j;

  memset (&parms, 0, sizeof(parms));

  COM_InitArgv (argc, argv);  
  parms.argc = com_argc;
  parms.argv = com_argv;

  parms.memsize = 16*1024*1024;

  j = COM_CheckParm("-mem");
  if (j)
    parms.memsize = (int) (Q_atof(com_argv[j+1]) * 1024 * 1024);
  if ((parms.membase = malloc (parms.memsize)) == NULL)
    Sys_Error("Can't allocate %ld\n", parms.memsize);

  parms.basedir = ".";

/*
  if (Sys_FileTime ("id1/pak0.pak") != -1)
  else
    parms.basedir = "/raid/quake/v2";
*/

  SV_Init (&parms);

// run one frame immediately for first heartbeat
  SV_Frame (0.1);   

//
// main loop
//
  oldtime = Sys_DoubleTime () - 0.1;
  while (1)
  {
  // select on the net socket and stdin
  // the only reason we have a timeout at all is so that if the last
  // connected client times out, the message would not otherwise
  // be printed until the next event.
    FD_ZERO(&fdset);
    if (do_stdin)
      FD_SET(0, &fdset);
    FD_SET(net_socket, &fdset);
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;
    if (select (net_socket+1, &fdset, NULL, NULL, &timeout) == -1)
      continue;
    stdin_ready = FD_ISSET(0, &fdset);

  // find time passed since last cycle
    newtime = Sys_DoubleTime ();
    time = newtime - oldtime;
    oldtime = newtime;
    
    SV_Frame (time);    
    
  // extrasleep is just a way to generate a fucked up connection on purpose
    if (sys_extrasleep.value)
      usleep (sys_extrasleep.value);
  } 
}