/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2013 Darklegion Development

This file is part of Tremulous.

Tremulous 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.

Tremulous 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 Tremulous; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#include "g_local.h"


/*QUAKED func_group (0 0 0) ?
Used to group brushes together just for editor convenience.  They are turned into normal brushes by the utilities.
*/


/*QUAKED info_null (0 0.5 0) (-4 -4 -4) (4 4 4)
Used as a positional target for calculations in the utilities (spotlights, etc), but removed during gameplay.
*/
void SP_info_null( gentity_t *self )
{
  G_FreeEntity( self );
}


/*QUAKED info_notnull (0 0.5 0) (-4 -4 -4) (4 4 4)
Used as a positional target for in-game calculation, like jumppad targets.
target_position does the same thing
*/
void SP_info_notnull( gentity_t *self )
{
  G_SetOrigin( self, self->s.origin );
}


/*QUAKED light (0 1 0) (-8 -8 -8) (8 8 8) linear
Non-displayed light.
"light" overrides the default 300 intensity.
Linear checbox gives linear falloff instead of inverse square
Lights pointed at a target will be spotlights.
"radius" overrides the default 64 unit radius of a spotlight at the target point.
*/
void SP_light( gentity_t *self )
{
  G_FreeEntity( self );
}



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

TELEPORTERS

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

void TeleportPlayer( gentity_t *player, vec3_t origin, vec3_t angles )
{
  // unlink to make sure it can't possibly interfere with G_KillBox
  trap_UnlinkEntity( player );

  VectorCopy( origin, player->client->ps.origin );
  player->client->ps.origin[ 2 ] += 1;

  // spit the player out
  AngleVectors( angles, player->client->ps.velocity, NULL, NULL );
  VectorScale( player->client->ps.velocity, 400, player->client->ps.velocity );
  player->client->ps.pm_time = 160;   // hold time
  player->client->ps.pm_flags |= PMF_TIME_KNOCKBACK;

  // toggle the teleport bit so the client knows to not lerp
  player->client->ps.eFlags ^= EF_TELEPORT_BIT;
  G_UnlaggedClear( player );

  // cut all relevant zap beams
  G_ClearPlayerZapEffects( player );

  // set angles
  G_SetClientViewAngle( player, angles );

  // save results of pmove
  BG_PlayerStateToEntityState( &player->client->ps, &player->s, qtrue );

  // use the precise origin for linking
  VectorCopy( player->client->ps.origin, player->r.currentOrigin );

  if( player->client->sess.spectatorState == SPECTATOR_NOT )
  {
    // kill anything at the destination
    G_KillBox( player );

    trap_LinkEntity (player);
  }
}


/*QUAKED misc_teleporter_dest (1 0 0) (-32 -32 -24) (32 32 -16)
Point teleporters at these.
Now that we don't have teleport destination pads, this is just
an info_notnull
*/
void SP_misc_teleporter_dest( gentity_t *ent )
{
}


//===========================================================

/*QUAKED misc_model (1 0 0) (-16 -16 -16) (16 16 16)
"model"   arbitrary .md3 file to display
*/
void SP_misc_model( gentity_t *ent )
{
#if 0
  ent->s.modelindex = G_ModelIndex( ent->model );
  VectorSet (ent->mins, -16, -16, -16);
  VectorSet (ent->maxs, 16, 16, 16);
  trap_LinkEntity (ent);

  G_SetOrigin( ent, ent->s.origin );
  VectorCopy( ent->s.angles, ent->s.apos.trBase );
#else
  G_FreeEntity( ent );
#endif
}

//===========================================================

void locateCamera( gentity_t *ent )
{
  vec3_t    dir;
  gentity_t *target;
  gentity_t *owner;

  owner = G_PickTarget( ent->target );
  if( !owner )
  {
    G_Printf( "Couldn't find target for misc_portal_surface\n" );
    G_FreeEntity( ent );
    return;
  }
  ent->r.ownerNum = owner->s.number;

  // frame holds the rotate speed
  if( owner->spawnflags & 1 )
    ent->s.frame = 25;
  else if( owner->spawnflags & 2 )
    ent->s.frame = 75;

  // swing camera ?
  if( owner->spawnflags & 4 )
  {
    // set to 0 for no rotation at all
    ent->s.misc = 0;
  }
  else
    ent->s.misc = 1;

  // clientNum holds the rotate offset
  ent->s.clientNum = owner->s.clientNum;

  VectorCopy( owner->s.origin, ent->s.origin2 );

  // see if the portal_camera has a target
  target = G_PickTarget( owner->target );
  if( target )
  {
    VectorSubtract( target->s.origin, owner->s.origin, dir );
    VectorNormalize( dir );
  }
  else
    G_SetMovedir( owner->s.angles, dir );

  ent->s.eventParm = DirToByte( dir );
}

/*QUAKED misc_portal_surface (0 0 1) (-8 -8 -8) (8 8 8)
The portal surface nearest this entity will show a view from the targeted misc_portal_camera, or a mirror view if untargeted.
This must be within 64 world units of the surface!
*/
void SP_misc_portal_surface( gentity_t *ent )
{
  VectorClear( ent->r.mins );
  VectorClear( ent->r.maxs );
  trap_LinkEntity( ent );

  ent->r.svFlags = SVF_PORTAL;
  ent->s.eType = ET_PORTAL;

  if( !ent->target )
  {
    VectorCopy( ent->s.origin, ent->s.origin2 );
  }
  else
  {
    ent->think = locateCamera;
    ent->nextthink = level.time + 100;
  }
}

/*QUAKED misc_portal_camera (0 0 1) (-8 -8 -8) (8 8 8) slowrotate fastrotate noswing

The target for a misc_portal_director.  You can set either angles or target another entity to determine the direction of view.
"roll" an angle modifier to orient the camera around the target vector;
*/
void SP_misc_portal_camera( gentity_t *ent )
{
  float roll;

  VectorClear( ent->r.mins );
  VectorClear( ent->r.maxs );
  trap_LinkEntity( ent );

  G_SpawnFloat( "roll", "0", &roll );

  ent->s.clientNum = roll / 360.0f * 256;
}

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

  NEAT EFFECTS AND STUFF FOR TREMULOUS

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

void SP_toggle_particle_system( gentity_t *self )
{
  //toggle EF_NODRAW
  self->s.eFlags ^= EF_NODRAW;

  self->nextthink = 0;
}

/*
===============
SP_use_particle_system

Use function for particle_system
===============
*/
void SP_use_particle_system( gentity_t *self, gentity_t *other, gentity_t *activator )
{
  SP_toggle_particle_system( self );

  if( self->wait > 0.0f )
  {
    self->think = SP_toggle_particle_system;
    self->nextthink = level.time + (int)( self->wait * 1000 );
  }
}

/*
===============
SP_spawn_particle_system

Spawn function for particle system
===============
*/
void SP_misc_particle_system( gentity_t *self )
{
  char  *s;

  G_SetOrigin( self, self->s.origin );

  G_SpawnString( "psName", "", &s );
  G_SpawnFloat( "wait", "0", &self->wait );

  //add the particle system to the client precache list
  self->s.modelindex = G_ParticleSystemIndex( s );

  if( self->spawnflags & 1 )
    self->s.eFlags |= EF_NODRAW;

  self->use = SP_use_particle_system;
  self->s.eType = ET_PARTICLE_SYSTEM;
  trap_LinkEntity( self );
}

/*
===============
SP_use_anim_model

Use function for anim model
===============
*/
void SP_use_anim_model( gentity_t *self, gentity_t *other, gentity_t *activator )
{
  if( self->spawnflags & 1 )
  {
    //if spawnflag 1 is set
    //toggle EF_NODRAW
    if( self->s.eFlags & EF_NODRAW )
      self->s.eFlags &= ~EF_NODRAW;
    else
      self->s.eFlags |= EF_NODRAW;
  }
  else
  {
    //if the animation loops then toggle the animation
    //toggle EF_MOVER_STOP
    if( self->s.eFlags & EF_MOVER_STOP )
      self->s.eFlags &= ~EF_MOVER_STOP;
    else
      self->s.eFlags |= EF_MOVER_STOP;
  }
}

/*
===============
SP_misc_anim_model

Spawn function for anim model
===============
*/
void SP_misc_anim_model( gentity_t *self )
{
  self->s.misc      = (int)self->animation[ 0 ];
  self->s.weapon    = (int)self->animation[ 1 ];
  self->s.torsoAnim = (int)self->animation[ 2 ];
  self->s.legsAnim  = (int)self->animation[ 3 ];

  self->s.angles2[ 0 ] = self->pos2[ 0 ];

  //add the model to the client precache list
  self->s.modelindex = G_ModelIndex( self->model );

  self->use = SP_use_anim_model;

  self->s.eType = ET_ANIMMAPOBJ;

  // spawn with animation stopped
  if( self->spawnflags & 2 )
    self->s.eFlags |= EF_MOVER_STOP;

  trap_LinkEntity( self );
}

/*
===============
SP_use_light_flare

Use function for light flare
===============
*/
void SP_use_light_flare( gentity_t *self, gentity_t *other, gentity_t *activator )
{
  self->s.eFlags ^= EF_NODRAW;
}

/*
===============
findEmptySpot

Finds an empty spot radius units from origin
==============
*/
static void findEmptySpot( vec3_t origin, float radius, vec3_t spot )
{
  int     i, j, k;
  vec3_t  delta, test, total;
  trace_t tr;

  VectorClear( total );

  //54(!) traces to test for empty spots
  for( i = -1; i <= 1; i++ )
  {
    for( j = -1; j <= 1; j++ )
    {
      for( k = -1; k <= 1; k++ )
      {
        VectorSet( delta, ( i * radius ),
                          ( j * radius ),
                          ( k * radius ) );

        VectorAdd( origin, delta, test );

        trap_Trace( &tr, test, NULL, NULL, test, ENTITYNUM_NONE, MASK_SOLID );

        if( !tr.allsolid )
        {
          trap_Trace( &tr, test, NULL, NULL, origin, ENTITYNUM_NONE, MASK_SOLID );
          VectorScale( delta, tr.fraction, delta );
          VectorAdd( total, delta, total );
        }
      }
    }
  }

  VectorNormalize( total );
  VectorScale( total, radius, total );
  VectorAdd( origin, total, spot );
}

/*
===============
SP_misc_light_flare

Spawn function for light flare
===============
*/
void SP_misc_light_flare( gentity_t *self )
{
  self->s.eType = ET_LIGHTFLARE;
  self->s.modelindex = G_ShaderIndex( self->targetShaderName );
  VectorCopy( self->pos2, self->s.origin2 );

  //try to find a spot near to the flare which is empty. This
  //is used to facilitate visibility testing
  findEmptySpot( self->s.origin, 8.0f, self->s.angles2 );

  self->use = SP_use_light_flare;

  G_SpawnFloat( "speed", "200", &self->speed );
  self->s.time = self->speed;

  G_SpawnInt( "mindist", "0", &self->s.generic1 );

  if( self->spawnflags & 1 )
    self->s.eFlags |= EF_NODRAW;

  trap_LinkEntity( self );
}