/***
*
*	Copyright (C) 2002 The Wastes Project, All Rights Reserved.
*	
*	This product contains software technology from Valve Software, LLC,
*	Copyright © 1996-2001, Valve LLC, 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
*   The Wastes Project.  All other use, distribution, or modification is prohibited
*   without written permission from The Wastes Project.
*
***/
#if !defined( __PARTICLEBASE_H_ )
#define __PARTICLEBASE_H_

#include <string.h> // memset
#include <list>
using namespace std;

//
// Data types
//

// Identical to vec3_t only it wont convert to Vector
typedef vec_t psvec3_t[3];

enum PclRenderMode_e {
	PRM_Normal = kRenderNormal,
	PRM_TransColor = kRenderTransColor,
	PRM_TransTexture = kRenderTransTexture,
	PRM_TransGlow = kRenderGlow,
	PRM_TransAlpha = kRenderTransAlpha,
	PRM_TransAdd = kRenderTransAdd,
};

enum PclCoordSystem_e {
	PCS_Standard,	// Particles spawn based off emitter location then use world coordinates
	PCS_Relative,	// Particles spawn based off emitter location, and stays relative to emitter location
};

// singly-linked particle
struct CParticle
{
	CParticle() : 
		m_flLifetime( 0 ), m_iModelIndex( 0 ), m_pNext( 0 )
	{
			memset( m_Origin, 0, sizeof( m_Origin ) );
			memset( m_Velocity, 0, sizeof( m_Velocity ) );
	}
	void AddParticle( CParticle *pPcl )
	{
		if( m_pNext )
			m_pNext->AddParticle( pPcl );
		else
		{
			m_pNext = pPcl;
		}
	}

	psvec3_t m_Origin;
	psvec3_t m_Velocity;
	float m_flLifetime;
	float m_flScale;
	float m_flGrowScale;

	int m_iModelIndex;
	CParticle *m_pNext;
};

//
// CSpriteEmitter
//
class CSpriteEmitter
{
public:
	CSpriteEmitter();
	CSpriteEmitter( const CSpriteEmitter &Cpy );
	~CSpriteEmitter();

	bool IsTransparent(){ return ( m_iRenderMode != PRM_Normal ) ? true : false; }
	void Render();
	void Update( double flFrametime );

	char m_szName[64];					// Emitter name
	int m_iNumSprites;					// How many sprites does this emitter use?
	int m_iSpriteHandles[10];			// Handles to sprites to utilize
	psvec3_t m_Origin;					// Location of this emitter
	psvec3_t m_Acceleration;			// Acceleration to apply to each particle
	psvec3_t m_StartOriginOffset;		// Offset to apply to each newly created particle
	psvec3_t m_StartOriginRange[2];		// Location min/max range to apply to each particle randomly
	psvec3_t m_StartVelocity[2];		// Starting velocity range for each particle
	psvec3_t m_MinVelocity;				// Min particle velocity
	psvec3_t m_MaxVelocity;				// Max particle velocity
	int m_iMaxParticles;				// Maximum number of particles.
	float m_flParticlesPerSecond;		// Particles to generate each second
	float m_flParticleLifetime[2];		// Particle lifetime range
	float m_flStartScaleRange[2];		// Particle starting scale range
	float m_flGrowScaleRange[2];		// Particle grow rate, rate per sec
	int m_iRenderMode;					// Rendering mode of the particles
	int m_iCoordSystem;					// Coordinate system for particles
	float m_flInactiveTime;				// If the particle emitter can't be seen for this time, it wont be rendered.
private:
	void AddParticle();
	void ClearList( CParticle *pList );

	CParticle *m_pParticles;
	float m_flLastParticleTime;
	float m_flNextPpsChange;
	int m_iNumParticles;
	float m_flInactiveStart;
};

class CParticleSystem
{
public:
	CParticleSystem();
	CParticleSystem( const CParticleSystem &Cpy );
	~CParticleSystem();	

	void Render( int Transparent );
	void Update( double flFrametime );

	char m_szName[64];	// Particle system name
	psvec3_t m_Origin;	// Particle system origin

	list<CSpriteEmitter> m_Emitters;
};

// Stores definitions of all particle systems read from disk
// Also maintains currently active particle systems
class CParticleSystemManager
{
public:
	CParticleSystemManager();
	~CParticleSystemManager();

	void RenderNormal();
	void RenderTransparent();
	void Update( double flFrametime );

	void AddParticleSystem( char *pszName, psvec3_t Origin );

	const CParticleSystem *GetParticleSystem( char *pszName );
	const CSpriteEmitter *GetEmitter( char *pszName );

	void CheckMap();
private:
	list<CParticleSystem> m_ActiveSystems;		// Currently active particle systems

	list<CSpriteEmitter> m_ReferenceEmitters;	// Emitters loaded from disk
	list<CParticleSystem> m_ReferenceSystems;	// Particle Systems loaded from disk

	char m_szCurrentLevel[1024];
};

extern CParticleSystemManager g_ParticleSystemManager;

#endif