/*
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.

*/
// cl_main.c  -- client main loop

#include "quakedef.h"

// we need to declare some mouse variables here, because the menu system
// references them even when on a unix system.

// these two are not intended to be set directly
cvar_t  cl_name = {"_cl_name", "player", true};
cvar_t  cl_color = {"_cl_color", "0", true};

cvar_t  cl_shownet = {"cl_shownet","0"};  // can be 0, 1, or 2
cvar_t  cl_nolerp = {"cl_nolerp","0"};

cvar_t  lookspring = {"lookspring","0", true};
cvar_t  lookstrafe = {"lookstrafe","0", true};
cvar_t  sensitivity = {"sensitivity","3", true};

cvar_t  m_pitch = {"m_pitch","0.022", true};
cvar_t  m_yaw = {"m_yaw","0.022", true};
cvar_t  m_forward = {"m_forward","1", true};
cvar_t  m_side = {"m_side","0.8", true};


client_static_t cls;
client_state_t  cl;
// FIXME: put these on hunk?
efrag_t     cl_efrags[MAX_EFRAGS];
entity_t    cl_entities[MAX_EDICTS];
entity_t    cl_static_entities[MAX_STATIC_ENTITIES];
lightstyle_t  cl_lightstyle[MAX_LIGHTSTYLES];
dlight_t    cl_dlights[MAX_DLIGHTS];

int       cl_numvisedicts;
entity_t    *cl_visedicts[MAX_VISEDICTS];

/*
=====================
CL_ClearState

=====================
*/
void CL_ClearState (void)
{
  int     i;

  if (!sv.active)
    Host_ClearMemory ();

// wipe the entire cl structure
  memset (&cl, 0, sizeof(cl));

  SZ_Clear (&cls.message);

// clear other arrays 
  memset (cl_efrags, 0, sizeof(cl_efrags));
  memset (cl_entities, 0, sizeof(cl_entities));
  memset (cl_dlights, 0, sizeof(cl_dlights));
  memset (cl_lightstyle, 0, sizeof(cl_lightstyle));
  memset (cl_temp_entities, 0, sizeof(cl_temp_entities));
  memset (cl_beams, 0, sizeof(cl_beams));

//
// allocate the efrags and chain together into a free list
//
  cl.free_efrags = cl_efrags;
  for (i=0 ; i<MAX_EFRAGS-1 ; i++)
    cl.free_efrags[i].entnext = &cl.free_efrags[i+1];
  cl.free_efrags[i].entnext = NULL;
}

/*
=====================
CL_Disconnect

Sends a disconnect message to the server
This is also called on Host_Error, so it shouldn't cause any errors
=====================
*/
void CL_Disconnect (void)
{
// stop sounds (especially looping!)
  S_StopAllSounds (true);
  
// bring the console down and fade the colors back to normal
//  SCR_BringDownConsole ();

// if running a local server, shut it down
  if (cls.demoplayback)
    CL_StopPlayback ();
  else if (cls.state == ca_connected)
  {
    if (cls.demorecording)
      CL_Stop_f ();

    Con_DPrintf ("Sending clc_disconnect\n");
    SZ_Clear (&cls.message);
    MSG_WriteByte (&cls.message, clc_disconnect);
    NET_SendUnreliableMessage (cls.netcon, &cls.message);
    SZ_Clear (&cls.message);
    NET_Close (cls.netcon);

    cls.state = ca_disconnected;
    if (sv.active)
      Host_ShutdownServer(false);
  }

  cls.demoplayback = cls.timedemo = false;
  cls.signon = 0;
}

void CL_Disconnect_f (void)
{
  CL_Disconnect ();
  if (sv.active)
    Host_ShutdownServer (false);
}




/*
=====================
CL_EstablishConnection

Host should be either "local" or a net address to be passed on
=====================
*/
void CL_EstablishConnection (char *host)
{
  if (cls.state == ca_dedicated)
    return;

  if (cls.demoplayback)
    return;

  CL_Disconnect ();

  cls.netcon = NET_Connect (host);
  if (!cls.netcon)
    Host_Error ("CL_Connect: connect failed\n");
  Con_DPrintf ("CL_EstablishConnection: connected to %s\n", host);
  
  cls.demonum = -1;     // not in the demo loop now
  cls.state = ca_connected;
  cls.signon = 0;       // need all the signon messages before playing
}

/*
=====================
CL_SignonReply

An svc_signonnum has been received, perform a client side setup
=====================
*/
void CL_SignonReply (void)
{
  char  str[8192];

Con_DPrintf ("CL_SignonReply: %i\n", cls.signon);

  switch (cls.signon)
  {
  case 1:
    MSG_WriteByte (&cls.message, clc_stringcmd);
    MSG_WriteString (&cls.message, "prespawn");
    break;
    
  case 2:   
    MSG_WriteByte (&cls.message, clc_stringcmd);
    MSG_WriteString (&cls.message, va("name \"%s\"\n", cl_name.string));
  
    MSG_WriteByte (&cls.message, clc_stringcmd);
    MSG_WriteString (&cls.message, va("color %i %i\n", ((int)cl_color.value)>>4, ((int)cl_color.value)&15));
  
    MSG_WriteByte (&cls.message, clc_stringcmd);
    sprintf (str, "spawn %s", cls.spawnparms);
    MSG_WriteString (&cls.message, str);
    break;
    
  case 3: 
    MSG_WriteByte (&cls.message, clc_stringcmd);
    MSG_WriteString (&cls.message, "begin");
    Cache_Report ();    // print remaining memory
    break;
    
  case 4:
    SCR_EndLoadingPlaque ();    // allow normal screen updates
    break;
  }
}

/*
=====================
CL_NextDemo

Called to play the next demo in the demo loop
=====================
*/
void CL_NextDemo (void)
{
  char  str[1024];

  if (cls.demonum == -1)
    return;   // don't play demos

  SCR_BeginLoadingPlaque ();

  if (!cls.demos[cls.demonum][0] || cls.demonum == MAX_DEMOS)
  {
    cls.demonum = 0;
    if (!cls.demos[cls.demonum][0])
    {
      Con_Printf ("No demos listed with startdemos\n");
      cls.demonum = -1;
      return;
    }
  }

  sprintf (str,"playdemo %s\n", cls.demos[cls.demonum]);
  Cbuf_InsertText (str);
  cls.demonum++;
}

/*
==============
CL_PrintEntities_f
==============
*/
void CL_PrintEntities_f (void)
{
  entity_t  *ent;
  int     i;
  
  for (i=0,ent=cl_entities ; i<cl.num_entities ; i++,ent++)
  {
    Con_Printf ("%3i:",i);
    if (!ent->model)
    {
      Con_Printf ("EMPTY\n");
      continue;
    }
    Con_Printf ("%s:%2i  (%5.1f,%5.1f,%5.1f) [%5.1f %5.1f %5.1f]\n"
    ,ent->model->name,ent->frame, ent->origin[0], ent->origin[1], ent->origin[2], ent->angles[0], ent->angles[1], ent->angles[2]);
  }
}


/*
===============
SetPal

Debugging tool, just flashes the screen
===============
*/
void SetPal (int i)
{
#if 0
  static int old;
  byte  pal[768];
  int   c;
  
  if (i == old)
    return;
  old = i;

  if (i==0)
    VID_SetPalette (host_basepal);
  else if (i==1)
  {
    for (c=0 ; c<768 ; c+=3)
    {
      pal[c] = 0;
      pal[c+1] = 255;
      pal[c+2] = 0;
    }
    VID_SetPalette (pal);
  }
  else
  {
    for (c=0 ; c<768 ; c+=3)
    {
      pal[c] = 0;
      pal[c+1] = 0;
      pal[c+2] = 255;
    }
    VID_SetPalette (pal);
  }
#endif
}

/*
===============
CL_AllocDlight

===============
*/
dlight_t *CL_AllocDlight (int key)
{
  int   i;
  dlight_t  *dl;

// first look for an exact key match
  if (key)
  {
    dl = cl_dlights;
    for (i=0 ; i<MAX_DLIGHTS ; i++, dl++)
    {
      if (dl->key == key)
      {
        memset (dl, 0, sizeof(*dl));
        dl->key = key;
        return dl;
      }
    }
  }

// then look for anything else
  dl = cl_dlights;
  for (i=0 ; i<MAX_DLIGHTS ; i++, dl++)
  {
    if (dl->die < cl.time)
    {
      memset (dl, 0, sizeof(*dl));
      dl->key = key;
      return dl;
    }
  }

  dl = &cl_dlights[0];
  memset (dl, 0, sizeof(*dl));
  dl->key = key;
  return dl;
}


/*
===============
CL_DecayLights

===============
*/
void CL_DecayLights (void)
{
  int     i;
  dlight_t  *dl;
  float   time;
  
  time = cl.time - cl.oldtime;

  dl = cl_dlights;
  for (i=0 ; i<MAX_DLIGHTS ; i++, dl++)
  {
    if (dl->die < cl.time || !dl->radius)
      continue;
    
    dl->radius -= time*dl->decay;
    if (dl->radius < 0)
      dl->radius = 0;
  }
}


/*
===============
CL_LerpPoint

Determines the fraction between the last two messages that the objects
should be put at.
===============
*/
float CL_LerpPoint (void)
{
  float f, frac;

  f = cl.mtime[0] - cl.mtime[1];
  
  if (!f || cl_nolerp.value || cls.timedemo || sv.active)
  {
    cl.time = cl.mtime[0];
    return 1;
  }
    
  if (f > 0.1)
  { // dropped packet, or start of demo
    cl.mtime[1] = cl.mtime[0] - 0.1;
    f = 0.1;
  }
  frac = (cl.time - cl.mtime[1]) / f;
//Con_Printf ("frac: %f\n",frac);
  if (frac < 0)
  {
    if (frac < -0.01)
    {
SetPal(1);
      cl.time = cl.mtime[1];
//        Con_Printf ("low frac\n");
    }
    frac = 0;
  }
  else if (frac > 1)
  {
    if (frac > 1.01)
    {
SetPal(2);
      cl.time = cl.mtime[0];
//        Con_Printf ("high frac\n");
    }
    frac = 1;
  }
  else
    SetPal(0);
    
  return frac;
}


/*
===============
CL_RelinkEntities
===============
*/
void CL_RelinkEntities (void)
{
  entity_t  *ent;
  int     i, j;
  float   frac, f, d;
  vec3_t    delta;
  float   bobjrotate;
  vec3_t    oldorg;
  dlight_t  *dl;

// determine partial update time  
  frac = CL_LerpPoint ();

  cl_numvisedicts = 0;

//
// interpolate player info
//
  for (i=0 ; i<3 ; i++)
    cl.velocity[i] = cl.mvelocity[1][i] + 
      frac * (cl.mvelocity[0][i] - cl.mvelocity[1][i]);

  if (cls.demoplayback)
  {
  // interpolate the angles 
    for (j=0 ; j<3 ; j++)
    {
      d = cl.mviewangles[0][j] - cl.mviewangles[1][j];
      if (d > 180)
        d -= 360;
      else if (d < -180)
        d += 360;
      cl.viewangles[j] = cl.mviewangles[1][j] + frac*d;
    }
  }
  
  bobjrotate = anglemod(100*cl.time);
  
// start on the entity after the world
  for (i=1,ent=cl_entities+1 ; i<cl.num_entities ; i++,ent++)
  {
    if (!ent->model)
    { // empty slot
      if (ent->forcelink)
        R_RemoveEfrags (ent); // just became empty
      continue;
    }

// if the object wasn't included in the last packet, remove it
    if (ent->msgtime != cl.mtime[0])
    {
      ent->model = NULL;
      continue;
    }

    VectorCopy (ent->origin, oldorg);

    if (ent->forcelink)
    { // the entity was not updated in the last message
      // so move to the final spot
      VectorCopy (ent->msg_origins[0], ent->origin);
      VectorCopy (ent->msg_angles[0], ent->angles);
    }
    else
    { // if the delta is large, assume a teleport and don't lerp
      f = frac;
      for (j=0 ; j<3 ; j++)
      {
        delta[j] = ent->msg_origins[0][j] - ent->msg_origins[1][j];
        if (delta[j] > 100 || delta[j] < -100)
          f = 1;    // assume a teleportation, not a motion
      }

    // interpolate the origin and angles
      for (j=0 ; j<3 ; j++)
      {
        ent->origin[j] = ent->msg_origins[1][j] + f*delta[j];

        d = ent->msg_angles[0][j] - ent->msg_angles[1][j];
        if (d > 180)
          d -= 360;
        else if (d < -180)
          d += 360;
        ent->angles[j] = ent->msg_angles[1][j] + f*d;
      }
      
    }

// rotate binary objects locally
    if (ent->model->flags & EF_ROTATE)
      ent->angles[1] = bobjrotate;

    if (ent->effects & EF_BRIGHTFIELD)
      R_EntityParticles (ent);
#ifdef QUAKE2
    if (ent->effects & EF_DARKFIELD)
      R_DarkFieldParticles (ent);
#endif
    if (ent->effects & EF_MUZZLEFLASH)
    {
      vec3_t    fv, rv, uv;

      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin,  dl->origin);
      dl->origin[2] += 16;
      AngleVectors (ent->angles, fv, rv, uv);
       
      VectorMA (dl->origin, 18, fv, dl->origin);
      dl->radius = 200 + (rand()&31);
      dl->minlight = 32;
      dl->die = cl.time + 0.1;
    }
    if (ent->effects & EF_BRIGHTLIGHT)
    {     
      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin,  dl->origin);
      dl->origin[2] += 16;
      dl->radius = 400 + (rand()&31);
      dl->die = cl.time + 0.001;
    }
    if (ent->effects & EF_DIMLIGHT)
    {     
      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin,  dl->origin);
      dl->radius = 200 + (rand()&31);
      dl->die = cl.time + 0.001;
    }
#ifdef QUAKE2
    if (ent->effects & EF_DARKLIGHT)
    {     
      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin,  dl->origin);
      dl->radius = 200.0 + (rand()&31);
      dl->die = cl.time + 0.001;
      dl->dark = true;
    }
    if (ent->effects & EF_LIGHT)
    {     
      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin,  dl->origin);
      dl->radius = 200;
      dl->die = cl.time + 0.001;
    }
#endif

    if (ent->model->flags & EF_GIB)
      R_RocketTrail (oldorg, ent->origin, 2);
    else if (ent->model->flags & EF_ZOMGIB)
      R_RocketTrail (oldorg, ent->origin, 4);
    else if (ent->model->flags & EF_TRACER)
      R_RocketTrail (oldorg, ent->origin, 3);
    else if (ent->model->flags & EF_TRACER2)
      R_RocketTrail (oldorg, ent->origin, 5);
    else if (ent->model->flags & EF_ROCKET)
    {
      R_RocketTrail (oldorg, ent->origin, 0);
      dl = CL_AllocDlight (i);
      VectorCopy (ent->origin, dl->origin);
      dl->radius = 200;
      dl->die = cl.time + 0.01;
    }
    else if (ent->model->flags & EF_GRENADE)
      R_RocketTrail (oldorg, ent->origin, 1);
    else if (ent->model->flags & EF_TRACER3)
      R_RocketTrail (oldorg, ent->origin, 6);

    ent->forcelink = false;

    if (i == cl.viewentity && !chase_active.value)
      continue;

#ifdef QUAKE2
    if ( ent->effects & EF_NODRAW )
      continue;
#endif
    if (cl_numvisedicts < MAX_VISEDICTS)
    {
      cl_visedicts[cl_numvisedicts] = ent;
      cl_numvisedicts++;
    }
  }

}


/*
===============
CL_ReadFromServer

Read all incoming data from the server
===============
*/
int CL_ReadFromServer (void)
{
  int   ret;

  cl.oldtime = cl.time;
  cl.time += host_frametime;
  
  do
  {
    ret = CL_GetMessage ();
    if (ret == -1)
      Host_Error ("CL_ReadFromServer: lost server connection");
    if (!ret)
      break;
    
    cl.last_received_message = realtime;
    CL_ParseServerMessage ();
  } while (ret && cls.state == ca_connected);
  
  if (cl_shownet.value)
    Con_Printf ("\n");

  CL_RelinkEntities ();
  CL_UpdateTEnts ();

//
// bring the links up to date
//
  return 0;
}

/*
=================
CL_SendCmd
=================
*/
void CL_SendCmd (void)
{
  usercmd_t   cmd;

  if (cls.state != ca_connected)
    return;

  if (cls.signon == SIGNONS)
  {
  // get basic movement from keyboard
    CL_BaseMove (&cmd);
  
  // allow mice or other external controllers to add to the move
    IN_Move (&cmd);
  
  // send the unreliable message
    CL_SendMove (&cmd);
  
  }

  if (cls.demoplayback)
  {
    SZ_Clear (&cls.message);
    return;
  }
  
// send the reliable message
  if (!cls.message.cursize)
    return;   // no message at all
  
  if (!NET_CanSendMessage (cls.netcon))
  {
    Con_DPrintf ("CL_WriteToServer: can't send\n");
    return;
  }

  if (NET_SendMessage (cls.netcon, &cls.message) == -1)
    Host_Error ("CL_WriteToServer: lost server connection");

  SZ_Clear (&cls.message);
}

/*
=================
CL_Init
=================
*/
void CL_Init (void)
{ 
  SZ_Alloc (&cls.message, 1024);

  CL_InitInput ();
  CL_InitTEnts ();
  
//
// register our commands
//
  Cvar_RegisterVariable (&cl_name);
  Cvar_RegisterVariable (&cl_color);
  Cvar_RegisterVariable (&cl_upspeed);
  Cvar_RegisterVariable (&cl_forwardspeed);
  Cvar_RegisterVariable (&cl_backspeed);
  Cvar_RegisterVariable (&cl_sidespeed);
  Cvar_RegisterVariable (&cl_movespeedkey);
  Cvar_RegisterVariable (&cl_yawspeed);
  Cvar_RegisterVariable (&cl_pitchspeed);
  Cvar_RegisterVariable (&cl_anglespeedkey);
  Cvar_RegisterVariable (&cl_shownet);
  Cvar_RegisterVariable (&cl_nolerp);
  Cvar_RegisterVariable (&lookspring);
  Cvar_RegisterVariable (&lookstrafe);
  Cvar_RegisterVariable (&sensitivity);

  Cvar_RegisterVariable (&m_pitch);
  Cvar_RegisterVariable (&m_yaw);
  Cvar_RegisterVariable (&m_forward);
  Cvar_RegisterVariable (&m_side);

//  Cvar_RegisterVariable (&cl_autofire);
  
  Cmd_AddCommand ("entities", CL_PrintEntities_f);
  Cmd_AddCommand ("disconnect", CL_Disconnect_f);
  Cmd_AddCommand ("record", CL_Record_f);
  Cmd_AddCommand ("stop", CL_Stop_f);
  Cmd_AddCommand ("playdemo", CL_PlayDemo_f);
  Cmd_AddCommand ("timedemo", CL_TimeDemo_f);
}