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

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.

This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").

Doom 3 Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 Source Code 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 Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

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

#include "sys/platform.h"
#include "physics/Force.h"
#include "Entity.h"

#include "physics/Physics_Base.h"

CLASS_DECLARATION( idPhysics, idPhysics_Base )
END_CLASS

/*
================
idPhysics_Base::idPhysics_Base
================
*/
idPhysics_Base::idPhysics_Base( void ) {
	self = NULL;
	clipMask = 0;
	SetGravity( gameLocal.GetGravity() );
	ClearContacts();
}

/*
================
idPhysics_Base::~idPhysics_Base
================
*/
idPhysics_Base::~idPhysics_Base( void ) {
	if ( self && self->GetPhysics() == this ) {
		self->SetPhysics( NULL );
	}
	idForce::DeletePhysics( this );
	ClearContacts();
}

/*
================
idPhysics_Base::Save
================
*/
void idPhysics_Base::Save( idSaveGame *savefile ) const {
	int i;

	savefile->WriteObject( self );
	savefile->WriteInt( clipMask );
	savefile->WriteVec3( gravityVector );
	savefile->WriteVec3( gravityNormal );

	savefile->WriteInt( contacts.Num() );
	for ( i = 0; i < contacts.Num(); i++ ) {
		savefile->WriteContactInfo( contacts[i] );
	}

	savefile->WriteInt( contactEntities.Num() );
	for ( i = 0; i < contactEntities.Num(); i++ ) {
		contactEntities[i].Save( savefile );
	}
}

/*
================
idPhysics_Base::Restore
================
*/
void idPhysics_Base::Restore( idRestoreGame *savefile ) {
	int i, num;

	savefile->ReadObject( reinterpret_cast<idClass *&>( self ) );
	savefile->ReadInt( clipMask );
	savefile->ReadVec3( gravityVector );
	savefile->ReadVec3( gravityNormal );

	savefile->ReadInt( num );
	contacts.SetNum( num );
	for ( i = 0; i < contacts.Num(); i++ ) {
		savefile->ReadContactInfo( contacts[i] );
	}

	savefile->ReadInt( num );
	contactEntities.SetNum( num );
	for ( i = 0; i < contactEntities.Num(); i++ ) {
		contactEntities[i].Restore( savefile );
	}
}

/*
================
idPhysics_Base::SetSelf
================
*/
void idPhysics_Base::SetSelf( idEntity *e ) {
	assert( e );
	self = e;
}

/*
================
idPhysics_Base::SetClipModel
================
*/
void idPhysics_Base::SetClipModel( idClipModel *model, float density, int id, bool freeOld ) {
}

/*
================
idPhysics_Base::GetClipModel
================
*/
idClipModel *idPhysics_Base::GetClipModel( int id ) const {
	return NULL;
}

/*
================
idPhysics_Base::GetNumClipModels
================
*/
int idPhysics_Base::GetNumClipModels( void ) const {
	return 0;
}

/*
================
idPhysics_Base::SetMass
================
*/
void idPhysics_Base::SetMass( float mass, int id ) {
}

/*
================
idPhysics_Base::GetMass
================
*/
float idPhysics_Base::GetMass( int id ) const {
	return 0.0f;
}

/*
================
idPhysics_Base::SetContents
================
*/
void idPhysics_Base::SetContents( int contents, int id ) {
}

/*
================
idPhysics_Base::SetClipMask
================
*/
int idPhysics_Base::GetContents( int id ) const {
	return 0;
}

/*
================
idPhysics_Base::SetClipMask
================
*/
void idPhysics_Base::SetClipMask( int mask, int id ) {
	clipMask = mask;
}

/*
================
idPhysics_Base::GetClipMask
================
*/
int idPhysics_Base::GetClipMask( int id ) const {
	return clipMask;
}

/*
================
idPhysics_Base::GetBounds
================
*/
const idBounds &idPhysics_Base::GetBounds( int id ) const {
	return bounds_zero;
}

/*
================
idPhysics_Base::GetAbsBounds
================
*/
const idBounds &idPhysics_Base::GetAbsBounds( int id ) const {
	return bounds_zero;
}

/*
================
idPhysics_Base::Evaluate
================
*/
bool idPhysics_Base::Evaluate( int timeStepMSec, int endTimeMSec ) {
	return false;
}

/*
================
idPhysics_Base::UpdateTime
================
*/
void idPhysics_Base::UpdateTime( int endTimeMSec ) {
}

/*
================
idPhysics_Base::GetTime
================
*/
int idPhysics_Base::GetTime( void ) const {
	return 0;
}

/*
================
idPhysics_Base::GetImpactInfo
================
*/
void idPhysics_Base::GetImpactInfo( const int id, const idVec3 &point, impactInfo_t *info ) const {
	memset( info, 0, sizeof( *info ) );
}

/*
================
idPhysics_Base::ApplyImpulse
================
*/
void idPhysics_Base::ApplyImpulse( const int id, const idVec3 &point, const idVec3 &impulse ) {
}

/*
================
idPhysics_Base::AddForce
================
*/
void idPhysics_Base::AddForce( const int id, const idVec3 &point, const idVec3 &force ) {
}

/*
================
idPhysics_Base::Activate
================
*/
void idPhysics_Base::Activate( void ) {
}

/*
================
idPhysics_Base::PutToRest
================
*/
void idPhysics_Base::PutToRest( void ) {
}

/*
================
idPhysics_Base::IsAtRest
================
*/
bool idPhysics_Base::IsAtRest( void ) const {
	return true;
}

/*
================
idPhysics_Base::GetRestStartTime
================
*/
int idPhysics_Base::GetRestStartTime( void ) const {
	return 0;
}

/*
================
idPhysics_Base::IsPushable
================
*/
bool idPhysics_Base::IsPushable( void ) const {
	return true;
}

/*
================
idPhysics_Base::SaveState
================
*/
void idPhysics_Base::SaveState( void ) {
}

/*
================
idPhysics_Base::RestoreState
================
*/
void idPhysics_Base::RestoreState( void ) {
}

/*
================
idPhysics_Base::SetOrigin
================
*/
void idPhysics_Base::SetOrigin( const idVec3 &newOrigin, int id ) {
}

/*
================
idPhysics_Base::SetAxis
================
*/
void idPhysics_Base::SetAxis( const idMat3 &newAxis, int id ) {
}

/*
================
idPhysics_Base::Translate
================
*/
void idPhysics_Base::Translate( const idVec3 &translation, int id ) {
}

/*
================
idPhysics_Base::Rotate
================
*/
void idPhysics_Base::Rotate( const idRotation &rotation, int id ) {
}

/*
================
idPhysics_Base::GetOrigin
================
*/
const idVec3 &idPhysics_Base::GetOrigin( int id ) const {
	return vec3_origin;
}

/*
================
idPhysics_Base::GetAxis
================
*/
const idMat3 &idPhysics_Base::GetAxis( int id ) const {
	return mat3_identity;
}

/*
================
idPhysics_Base::SetLinearVelocity
================
*/
void idPhysics_Base::SetLinearVelocity( const idVec3 &newLinearVelocity, int id ) {
}

/*
================
idPhysics_Base::SetAngularVelocity
================
*/
void idPhysics_Base::SetAngularVelocity( const idVec3 &newAngularVelocity, int id ) {
}

/*
================
idPhysics_Base::GetLinearVelocity
================
*/
const idVec3 &idPhysics_Base::GetLinearVelocity( int id ) const {
	return vec3_origin;
}

/*
================
idPhysics_Base::GetAngularVelocity
================
*/
const idVec3 &idPhysics_Base::GetAngularVelocity( int id ) const {
	return vec3_origin;
}

/*
================
idPhysics_Base::SetGravity
================
*/
void idPhysics_Base::SetGravity( const idVec3 &newGravity ) {
	gravityVector = newGravity;
	gravityNormal = newGravity;
	gravityNormal.Normalize();
}

/*
================
idPhysics_Base::GetGravity
================
*/
const idVec3 &idPhysics_Base::GetGravity( void ) const {
	return gravityVector;
}

/*
================
idPhysics_Base::GetGravityNormal
================
*/
const idVec3 &idPhysics_Base::GetGravityNormal( void ) const {
	return gravityNormal;
}

/*
================
idPhysics_Base::ClipTranslation
================
*/
void idPhysics_Base::ClipTranslation( trace_t &results, const idVec3 &translation, const idClipModel *model ) const {
	memset( &results, 0, sizeof( trace_t ) );
}

/*
================
idPhysics_Base::ClipRotation
================
*/
void idPhysics_Base::ClipRotation( trace_t &results, const idRotation &rotation, const idClipModel *model ) const {
	memset( &results, 0, sizeof( trace_t ) );
}

/*
================
idPhysics_Base::ClipContents
================
*/
int idPhysics_Base::ClipContents( const idClipModel *model ) const {
	return 0;
}

/*
================
idPhysics_Base::DisableClip
================
*/
void idPhysics_Base::DisableClip( void ) {
}

/*
================
idPhysics_Base::EnableClip
================
*/
void idPhysics_Base::EnableClip( void ) {
}

/*
================
idPhysics_Base::UnlinkClip
================
*/
void idPhysics_Base::UnlinkClip( void ) {
}

/*
================
idPhysics_Base::LinkClip
================
*/
void idPhysics_Base::LinkClip( void ) {
}

/*
================
idPhysics_Base::EvaluateContacts
================
*/
bool idPhysics_Base::EvaluateContacts( void ) {
	return false;
}

/*
================
idPhysics_Base::GetNumContacts
================
*/
int idPhysics_Base::GetNumContacts( void ) const {
	return contacts.Num();
}

/*
================
idPhysics_Base::GetContact
================
*/
const contactInfo_t &idPhysics_Base::GetContact( int num ) const {
	return contacts[num];
}

/*
================
idPhysics_Base::ClearContacts
================
*/
void idPhysics_Base::ClearContacts( void ) {
	int i;
	idEntity *ent;

	for ( i = 0; i < contacts.Num(); i++ ) {
		ent = gameLocal.entities[ contacts[i].entityNum ];
		if ( ent ) {
			ent->RemoveContactEntity( self );
		}
	}
	contacts.SetNum( 0, false );
}

/*
================
idPhysics_Base::AddContactEntity
================
*/
void idPhysics_Base::AddContactEntity( idEntity *e ) {
	int i;
	idEntity *ent;
	bool found = false;

	for ( i = 0; i < contactEntities.Num(); i++ ) {
		ent = contactEntities[i].GetEntity();
		if ( ent == NULL ) {
			contactEntities.RemoveIndex( i-- );
		}
		if ( ent == e ) {
			found = true;
		}
	}
	if ( !found ) {
		contactEntities.Alloc() = e;
	}
}

/*
================
idPhysics_Base::RemoveContactEntity
================
*/
void idPhysics_Base::RemoveContactEntity( idEntity *e ) {
	int i;
	idEntity *ent;

	for ( i = 0; i < contactEntities.Num(); i++ ) {
		ent = contactEntities[i].GetEntity();
		if ( !ent ) {
			contactEntities.RemoveIndex( i-- );
			continue;
		}
		if ( ent == e ) {
			contactEntities.RemoveIndex( i-- );
			return;
		}
	}
}

/*
================
idPhysics_Base::HasGroundContacts
================
*/
bool idPhysics_Base::HasGroundContacts( void ) const {
	int i;

	for ( i = 0; i < contacts.Num(); i++ ) {
		if ( contacts[i].normal * -gravityNormal > 0.0f ) {
			return true;
		}
	}
	return false;
}

/*
================
idPhysics_Base::IsGroundEntity
================
*/
bool idPhysics_Base::IsGroundEntity( int entityNum ) const {
	int i;

	for ( i = 0; i < contacts.Num(); i++ ) {
		if ( contacts[i].entityNum == entityNum && ( contacts[i].normal * -gravityNormal > 0.0f ) ) {
			return true;
		}
	}
	return false;
}

/*
================
idPhysics_Base::IsGroundClipModel
================
*/
bool idPhysics_Base::IsGroundClipModel( int entityNum, int id ) const {
	int i;

	for ( i = 0; i < contacts.Num(); i++ ) {
		if ( contacts[i].entityNum == entityNum && contacts[i].id == id && ( contacts[i].normal * -gravityNormal > 0.0f ) ) {
			return true;
		}
	}
	return false;
}

/*
================
idPhysics_Base::SetPushed
================
*/
void idPhysics_Base::SetPushed( int deltaTime ) {
}

/*
================
idPhysics_Base::GetPushedLinearVelocity
================
*/
const idVec3 &idPhysics_Base::GetPushedLinearVelocity( const int id ) const {
	return vec3_origin;
}

/*
================
idPhysics_Base::GetPushedAngularVelocity
================
*/
const idVec3 &idPhysics_Base::GetPushedAngularVelocity( const int id ) const {
	return vec3_origin;
}

/*
================
idPhysics_Base::SetMaster
================
*/
void idPhysics_Base::SetMaster( idEntity *master, const bool orientated ) {
}

/*
================
idPhysics_Base::GetBlockingInfo
================
*/
const trace_t *idPhysics_Base::GetBlockingInfo( void ) const {
	return NULL;
}

/*
================
idPhysics_Base::GetBlockingEntity
================
*/
idEntity *idPhysics_Base::GetBlockingEntity( void ) const {
	return NULL;
}

/*
================
idPhysics_Base::GetLinearEndTime
================
*/
int idPhysics_Base::GetLinearEndTime( void ) const {
	return 0;
}

/*
================
idPhysics_Base::GetAngularEndTime
================
*/
int idPhysics_Base::GetAngularEndTime( void ) const {
	return 0;
}

/*
================
idPhysics_Base::AddGroundContacts
================
*/
void idPhysics_Base::AddGroundContacts( const idClipModel *clipModel ) {
	idVec6 dir;
	int index, num;

	index = contacts.Num();
	contacts.SetNum( index + 10, false );

	dir.SubVec3(0) = gravityNormal;
	dir.SubVec3(1) = vec3_origin;
	num = gameLocal.clip.Contacts( &contacts[index], 10, clipModel->GetOrigin(),
					dir, CONTACT_EPSILON, clipModel, clipModel->GetAxis(), clipMask, self );
	contacts.SetNum( index + num, false );
}

/*
================
idPhysics_Base::AddContactEntitiesForContacts
================
*/
void idPhysics_Base::AddContactEntitiesForContacts( void ) {
	int i;
	idEntity *ent;

	for ( i = 0; i < contacts.Num(); i++ ) {
		ent = gameLocal.entities[ contacts[i].entityNum ];
		if ( ent && ent != self ) {
			ent->AddContactEntity( self );
		}
	}
}

/*
================
idPhysics_Base::ActivateContactEntities
================
*/
void idPhysics_Base::ActivateContactEntities( void ) {
	int i;
	idEntity *ent;

	for ( i = 0; i < contactEntities.Num(); i++ ) {
		ent = contactEntities[i].GetEntity();
		if ( ent ) {
			ent->ActivatePhysics( self );
		} else {
			contactEntities.RemoveIndex( i-- );
		}
	}
}

/*
================
idPhysics_Base::IsOutsideWorld
================
*/
bool idPhysics_Base::IsOutsideWorld( void ) const {
	if ( !gameLocal.clip.GetWorldBounds().Expand( 128.0f ).IntersectsBounds( GetAbsBounds() ) ) {
		return true;
	}
	return false;
}

/*
================
idPhysics_Base::DrawVelocity
================
*/
void idPhysics_Base::DrawVelocity( int id, float linearScale, float angularScale ) const {
	idVec3 dir, org, vec, start, end;
	idMat3 axis;
	float length, a;

	dir = GetLinearVelocity( id );
	dir *= linearScale;
	if ( dir.LengthSqr() > Square( 0.1f ) ) {
		dir.Truncate( 10.0f );
		org = GetOrigin( id );
		gameRenderWorld->DebugArrow( colorRed, org, org + dir, 1 );
	}

	dir = GetAngularVelocity( id );
	length = dir.Normalize();
	length *= angularScale;
	if ( length > 0.1f ) {
		if ( length < 60.0f ) {
			length = 60.0f;
		}
		else if ( length > 360.0f ) {
			length = 360.0f;
		}
		axis = GetAxis( id );
		vec = axis[2];
		if ( idMath::Fabs( dir * vec ) > 0.99f ) {
			vec = axis[0];
		}
		vec -= vec * dir * vec;
		vec.Normalize();
		vec *= 4.0f;
		start = org + vec;
		for ( a = 20.0f; a < length; a += 20.0f ) {
			end = org + idRotation( vec3_origin, dir, -a ).ToMat3() * vec;
			gameRenderWorld->DebugLine( colorBlue, start, end, 1 );
			start = end;
		}
		end = org + idRotation( vec3_origin, dir, -length ).ToMat3() * vec;
		gameRenderWorld->DebugArrow( colorBlue, start, end, 1 );
	}
}

/*
================
idPhysics_Base::WriteToSnapshot
================
*/
void idPhysics_Base::WriteToSnapshot( idBitMsgDelta &msg ) const {
}

/*
================
idPhysics_Base::ReadFromSnapshot
================
*/
void idPhysics_Base::ReadFromSnapshot( const idBitMsgDelta &msg ) {
}