/***
*
*	Copyright (c) 1996-2001, Valve LLC. All rights reserved.
*	
*	This product contains software technology licensed from Id 
*	Software, Inc. ("Id Technology").  Id Technology (c) 1996 Id Software, Inc. 
*	All Rights Reserved.
*
*   Use, distribution, and modification of this source code and/or resulting
*   object code is restricted to non-commercial enhancements to products from
*   Valve LLC.  All other use, distribution, or modification is prohibited
*   without written permission from Valve LLC.
*
****/
/*

===== weapons.cpp ========================================================

  functions governing the selection/use of weapons for players

*/

#include "extdll.h"
#include "util.h"
#include "cmbase.h"
#include "cmbasemonster.h"
#include "monsters.h"
#include "weapons.h"
#include "nodes.h"
#include "decals.h"

extern CGraph	WorldGraph;

MULTIDAMAGE gMultiDamage;

#define TRACER_FREQ		4			// Tracers fire every fourth bullet


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

MULTI-DAMAGE

Collects multiple small damages into a single damage

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

//
// ClearMultiDamage - resets the global multi damage accumulator
//
void ClearMultiDamage(void)
{
	gMultiDamage.pEntity = NULL;
	gMultiDamage.amount	= 0;
	gMultiDamage.type = 0;
}


//
// ApplyMultiDamage - inflicts contents of global multi damage register on gMultiDamage.pEntity
//
// GLOBALS USED:
//		gMultiDamage

void ApplyMultiDamage(entvars_t *pevInflictor, entvars_t *pevAttacker )
{
	Vector		vecSpot1;//where blood comes from
	Vector		vecDir;//direction blood should go
	TraceResult	tr;
	
	if ( !gMultiDamage.pEntity )
		return;

	if (UTIL_IsPlayer(gMultiDamage.pEntity))
		UTIL_TakeDamage(gMultiDamage.pEntity, pevInflictor, pevAttacker, gMultiDamage.amount, gMultiDamage.type );
	else if (gMultiDamage.pEntity->v.euser4 != NULL)
	{
		CMBaseMonster *pMonster = GetClassPtr((CMBaseMonster *)VARS(gMultiDamage.pEntity));
		pMonster->TakeDamage(pevInflictor, pevAttacker, gMultiDamage.amount, gMultiDamage.type );
	}
	else
		UTIL_TakeDamageExternal(gMultiDamage.pEntity, pevInflictor, pevAttacker, gMultiDamage.amount, gMultiDamage.type );
}


// GLOBALS USED:
//		gMultiDamage

void AddMultiDamage( entvars_t *pevInflictor, edict_t *pEntity, float flDamage, int bitsDamageType)
{
	if ( !pEntity )
		return;
	
	gMultiDamage.type |= bitsDamageType;

	if ( pEntity != gMultiDamage.pEntity )
	{
		ApplyMultiDamage(pevInflictor,pevInflictor); // UNDONE: wrong attacker!
		gMultiDamage.pEntity	= pEntity;
		gMultiDamage.amount		= 0;
	}

	gMultiDamage.amount += flDamage;
}

/*
================
SpawnBlood
================
*/
void SpawnBlood(Vector vecSpot, int bloodColor, float flDamage)
{
	UTIL_BloodDrips( vecSpot, g_vecAttackDir, bloodColor, (int)flDamage );
}


int DamageDecal( CMBaseEntity *pEntity, int bitsDamageType )
{
	if ( !pEntity )
		return (DECAL_GUNSHOT1 + RANDOM_LONG(0,4));
	
	return pEntity->DamageDecal( bitsDamageType );
}

void DecalGunshot( TraceResult *pTrace, int iBulletType )
{
	// Is the entity valid
	if ( !UTIL_IsValidEntity( pTrace->pHit ) )
		return;

	if ( VARS(pTrace->pHit)->solid == SOLID_BSP || VARS(pTrace->pHit)->movetype == MOVETYPE_PUSHSTEP )
	{
		CMBaseEntity *pEntity = NULL;
		// Decal the wall with a gunshot
		if ( !FNullEnt(pTrace->pHit) )
			pEntity = CMBaseEntity::Instance(pTrace->pHit);

		switch( iBulletType )
		{
			case BULLET_PLAYER_CROWBAR:
			{
				// wall decal
				UTIL_DecalTrace( pTrace, DamageDecal( pEntity, DMG_CLUB ) );
				break;
			}
			default:
			{
				// smoke and decal
				UTIL_GunshotDecalTrace( pTrace, DamageDecal( pEntity, DMG_BULLET ) );
				break;
			}
		/* why the duplicate case?
		case BULLET_PLAYER_9MM:
		case BULLET_MONSTER_9MM:
		case BULLET_PLAYER_MP5:
		case BULLET_MONSTER_MP5:
		case BULLET_PLAYER_BUCKSHOT:
		case BULLET_PLAYER_357:
		default:
			// smoke and decal
			UTIL_GunshotDecalTrace( pTrace, DamageDecal( pEntity, DMG_BULLET ) );
			break;
		case BULLET_MONSTER_12MM:
			// smoke and decal
			UTIL_GunshotDecalTrace( pTrace, DamageDecal( pEntity, DMG_BULLET ) );
			break;
		case BULLET_PLAYER_CROWBAR:
			// wall decal
			UTIL_DecalTrace( pTrace, DamageDecal( pEntity, DMG_CLUB ) );
			break;
		*/
		}
	}
}



//
// EjectBrass - tosses a brass shell from passed origin at passed velocity
//
void EjectBrass ( const Vector &vecOrigin, const Vector &vecVelocity, float rotation, int model, int soundtype )
{
	// FIX: when the player shoots, their gun isn't in the same position as it is on the model other players see.

	MESSAGE_BEGIN( MSG_PVS, SVC_TEMPENTITY, vecOrigin );
		WRITE_BYTE( TE_MODEL);
		WRITE_COORD( vecOrigin.x);
		WRITE_COORD( vecOrigin.y);
		WRITE_COORD( vecOrigin.z);
		WRITE_COORD( vecVelocity.x);
		WRITE_COORD( vecVelocity.y);
		WRITE_COORD( vecVelocity.z);
		WRITE_ANGLE( rotation );
		WRITE_SHORT( model );
		WRITE_BYTE ( soundtype);
		WRITE_BYTE ( 25 );// 2.5 seconds
	MESSAGE_END();
}


#if 0
// UNDONE: This is no longer used?
void ExplodeModel( const Vector &vecOrigin, float speed, int model, int count )
{
	MESSAGE_BEGIN( MSG_PVS, SVC_TEMPENTITY, vecOrigin );
		WRITE_BYTE ( TE_EXPLODEMODEL );
		WRITE_COORD( vecOrigin.x );
		WRITE_COORD( vecOrigin.y );
		WRITE_COORD( vecOrigin.z );
		WRITE_COORD( speed );
		WRITE_SHORT( model );
		WRITE_SHORT( count );
		WRITE_BYTE ( 15 );// 1.5 seconds
	MESSAGE_END();
}
#endif


BOOL CanAttack( float attack_time, float curtime, BOOL isPredicted )
{
#if defined( CLIENT_WEAPONS )
	if ( !isPredicted )
#else
	if ( 1 )
#endif
	{
		return ( attack_time <= curtime ) ? TRUE : FALSE;
	}
	else
	{
		return ( attack_time <= 0.0 ) ? TRUE : FALSE;
	}
}