/***************************************************************************
 *
 * PROJECT: The Dark Mod
 * $Revision$
 * $Date$
 * $Author$
 *
 ***************************************************************************/

// Copyright (C) 2004 Id Software, Inc.
//
/***********************************************************************

game/ai/AI_Vagary.cpp

Vagary specific AI code

***********************************************************************/

#include "../../idlib/precompiled.h"
#pragma hdrstop

static bool init_version = FileVersionList("$Id$", init_version);

#include "../game_local.h"

class idAI_Vagary : public idAI {
public:
	CLASS_PROTOTYPE( idAI_Vagary );

private:
	void	Event_ChooseObjectToThrow( const idVec3 &mins, const idVec3 &maxs, float speed, float minDist, float offset );
	void	Event_ThrowObjectAtEnemy( idEntity *ent, float speed );
};

const idEventDef AI_Vagary_ChooseObjectToThrow( "vagary_ChooseObjectToThrow", "vvfff", 'e' );
const idEventDef AI_Vagary_ThrowObjectAtEnemy( "vagary_ThrowObjectAtEnemy", "ef" );

CLASS_DECLARATION( idAI, idAI_Vagary )
	EVENT( AI_Vagary_ChooseObjectToThrow,	idAI_Vagary::Event_ChooseObjectToThrow )
	EVENT( AI_Vagary_ThrowObjectAtEnemy,	idAI_Vagary::Event_ThrowObjectAtEnemy )
END_CLASS

/*
================
idAI_Vagary::Event_ChooseObjectToThrow
================
*/
void idAI_Vagary::Event_ChooseObjectToThrow( const idVec3 &mins, const idVec3 &maxs, float speed, float minDist, float offset ) {
	idEntity *	ent;
	idEntity *	entityList[ MAX_GENTITIES ];
	int			numListedEntities;
	int			i, index;
	float		dist;
	idVec3		vel;
	idVec3		offsetVec( 0, 0, offset );
	idEntity	*enemyEnt = enemy.GetEntity();

	if ( !enemyEnt ) {
		idThread::ReturnEntity( NULL );
	}

	idVec3 enemyEyePos = lastVisibleEnemyPos + lastVisibleEnemyEyeOffset;
	const idBounds &myBounds = physicsObj.GetAbsBounds();
	idBounds checkBounds( mins, maxs );
	checkBounds.TranslateSelf( physicsObj.GetOrigin() );
	numListedEntities = gameLocal.clip.EntitiesTouchingBounds( checkBounds, -1, entityList, MAX_GENTITIES );

	index = gameLocal.random.RandomInt( numListedEntities );
	for ( i = 0; i < numListedEntities; i++, index++ ) {
		if ( index >= numListedEntities ) {
			index = 0;
		}
		ent = entityList[ index ];
		if ( !ent->IsType( idMoveable::Type ) ) {
			continue;
		}

		if ( ent->fl.hidden ) {
			// don't throw hidden objects
			continue;
		}

		idPhysics *entPhys = ent->GetPhysics();
		const idVec3 &entOrg = entPhys->GetOrigin();
		dist = ( entOrg - enemyEyePos ).LengthFast();
		if ( dist < minDist ) {
			continue;
		}

		idBounds expandedBounds = myBounds.Expand( entPhys->GetBounds().GetRadius() );
		if ( expandedBounds.LineIntersection( entOrg, enemyEyePos ) ) {
			// ignore objects that are behind us
			continue;
		}

		if ( PredictTrajectory( entPhys->GetOrigin() + offsetVec, enemyEyePos, speed, entPhys->GetGravity(), 
			entPhys->GetClipModel(), entPhys->GetClipMask(), MAX_WORLD_SIZE, NULL, enemyEnt, ai_debugTrajectory.GetBool() ? 4000 : 0, vel ) ) {
			idThread::ReturnEntity( ent );
            return;
		}
	}

	idThread::ReturnEntity( NULL );
}

/*
================
idAI_Vagary::Event_ThrowObjectAtEnemy
================
*/
void idAI_Vagary::Event_ThrowObjectAtEnemy( idEntity *ent, float speed ) {
	idVec3		vel;
	idEntity	*enemyEnt;
	idPhysics	*entPhys;

	entPhys	= ent->GetPhysics();
	enemyEnt = enemy.GetEntity();
	if ( !enemyEnt ) {
		vel = ( viewAxis[ 0 ] * physicsObj.GetGravityAxis() ) * speed;
	} else {
		PredictTrajectory( entPhys->GetOrigin(), lastVisibleEnemyPos + lastVisibleEnemyEyeOffset, speed, entPhys->GetGravity(), 
			entPhys->GetClipModel(), entPhys->GetClipMask(), MAX_WORLD_SIZE, NULL, enemyEnt, ai_debugTrajectory.GetBool() ? 4000 : 0, vel );
		vel *= speed;
	}

	entPhys->SetLinearVelocity( vel );

	if ( ent->IsType( idMoveable::Type ) ) {
		idMoveable *ment = static_cast<idMoveable*>( ent );
		ment->EnableDamage( true, 2.5f );
	}
}