/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#ifndef __CCPARTICLE_SYSTEM_H__
#define __CCPARTICLE_SYSTEM_H__

#include "CCProtocols.h"
#include "CCNode.h"
#include "CCDictionary.h"
#include "CCString.h"

NS_CC_BEGIN

class CCParticleBatchNode;

//* @enum
enum {
	/** The Particle emitter lives forever */
	kCCParticleDurationInfinity = -1,

	/** The starting size of the particle is equal to the ending size */
	kCCParticleStartSizeEqualToEndSize = -1,

	/** The starting radius of the particle is equal to the ending radius */
	kCCParticleStartRadiusEqualToEndRadius = -1,

	// backward compatible
	kParticleStartSizeEqualToEndSize = kCCParticleStartSizeEqualToEndSize,
	kParticleDurationInfinity = kCCParticleDurationInfinity,
};

//* @enum
enum {
	/** Gravity mode (A mode) */
	kCCParticleModeGravity,

	/** Radius mode (B mode) */
	kCCParticleModeRadius,	
};


/** @typedef tCCPositionType
possible types of particle positions
*/
typedef enum {
    /** Living particles are attached to the world and are unaffected by emitter repositioning. */
	kCCPositionTypeFree,

    /** Living particles are attached to the world but will follow the emitter repositioning.
    Use case: Attach an emitter to an sprite, and you want that the emitter follows the sprite.
    */
    kCCPositionTypeRelative,

    /** Living particles are attached to the emitter and are translated along with it. */
	kCCPositionTypeGrouped,
}tCCPositionType;

// backward compatible
enum {
	kPositionTypeFree = kCCPositionTypeFree,
	kPositionTypeGrouped = kCCPositionTypeGrouped,
}; 

/**
Structure that contains the values of each particle
*/
typedef struct sCCParticle {
	CCPoint     pos;
	CCPoint     startPos;

	ccColor4F	color;
	ccColor4F	deltaColor;

	float		size;
	float		deltaSize;

	float		rotation;
	float		deltaRotation;

	ccTime		timeToLive;

	unsigned int	atlasIndex;

	//! Mode A: gravity, direction, radial accel, tangential accel
	struct {
		CCPoint		dir;
		float		radialAccel;
		float		tangentialAccel;
	} modeA;

	//! Mode B: radius mode
	struct {
		float		angle;
		float		degreesPerSecond;
		float		radius;
		float		deltaRadius;
	} modeB;

}tCCParticle;

//typedef void (*CC_UPDATE_PARTICLE_IMP)(id, SEL, tCCParticle*, CCPoint);

class CCTexture2D;

/** @brief Particle System base class.
Attributes of a Particle System:
- emmision rate of the particles
- Gravity Mode (Mode A):
- gravity
- direction
- speed +-  variance
- tangential acceleration +- variance
- radial acceleration +- variance
- Radius Mode (Mode B):
- startRadius +- variance
- endRadius +- variance
- rotate +- variance
- Properties common to all modes:
- life +- life variance
- start spin +- variance
- end spin +- variance
- start size +- variance
- end size +- variance
- start color +- variance
- end color +- variance
- life +- variance
- blending function
- texture

cocos2d also supports particles generated by Particle Designer (http://particledesigner.71squared.com/).
'Radius Mode' in Particle Designer uses a fixed emit rate of 30 hz. Since that can't be guarateed in cocos2d,
cocos2d uses a another approach, but the results are almost identical. 

cocos2d supports all the variables used by Particle Designer plus a bit more:
- spinning particles (supported when using CCParticleSystemQuad)
- tangential acceleration (Gravity mode)
- radial acceleration (Gravity mode)
- radius direction (Radius mode) (Particle Designer supports outwards to inwards direction only)

It is possible to customize any of the above mentioned properties in runtime. Example:

@code
emitter.radialAccel = 15;
emitter.startSpin = 0;
@endcode

*/
class CC_DLL CCParticleSystem : public CCNode, public CCTextureProtocol
{	
protected:
	std::string m_sPlistFile;
	//! time elapsed since the start of the system (in seconds)
	float m_fElapsed;

	// Different modes
	//! Mode A:Gravity + Tangential Accel + Radial Accel
	struct {
		/** Gravity value. Only available in 'Gravity' mode. */
		CCPoint gravity;
		/** speed of each particle. Only available in 'Gravity' mode.  */
		float speed;
		/** speed variance of each particle. Only available in 'Gravity' mode. */
		float speedVar;
		/** tangential acceleration of each particle. Only available in 'Gravity' mode. */
		float tangentialAccel;
		/** tangential acceleration variance of each particle. Only available in 'Gravity' mode. */
		float tangentialAccelVar;
		/** radial acceleration of each particle. Only available in 'Gravity' mode. */
		float radialAccel;
		/** radial acceleration variance of each particle. Only available in 'Gravity' mode. */
		float radialAccelVar;
	} modeA;

	//! Mode B: circular movement (gravity, radial accel and tangential accel don't are not used in this mode)
	struct {
		/** The starting radius of the particles. Only available in 'Radius' mode. */
		float startRadius;
		/** The starting radius variance of the particles. Only available in 'Radius' mode. */
		float startRadiusVar;
		/** The ending radius of the particles. Only available in 'Radius' mode. */
		float endRadius;
		/** The ending radius variance of the particles. Only available in 'Radius' mode. */
		float endRadiusVar;			
		/** Number of degress to rotate a particle around the source pos per second. Only available in 'Radius' mode. */
		float rotatePerSecond;
		/** Variance in degrees for rotatePerSecond. Only available in 'Radius' mode. */
		float rotatePerSecondVar;
	} modeB;

	//! Array of particles
	tCCParticle *m_pParticles;

	// color modulate
	//	BOOL colorModulate;

	//! How many particles can be emitted per second
	float m_fEmitCounter;

	//!  particle idx
	unsigned int m_uParticleIdx;

	// Optimization
	//CC_UPDATE_PARTICLE_IMP	updateParticleImp;
	//SEL						updateParticleSel;

	/** weak reference to the CCSpriteBatchNode that renders the CCSprite */
	CC_PROPERTY(CCParticleBatchNode*, m_pBatchNode, BatchNode);

	// index of system in batch node array
	CC_SYNTHESIZE(unsigned int, m_uAtlasIndex, AtlasIndex);

	//true if scaled or rotated
	bool m_bTransformSystemDirty;
	// Number of allocated particles
	unsigned int m_uAllocatedParticles;

	/** Is the emitter active */
	CC_PROPERTY_READONLY(bool, m_bIsActive, IsActive)
	/** Quantity of particles that are being simulated at the moment */
	CC_PROPERTY_READONLY(unsigned int, m_uParticleCount, ParticleCount)
	/** How many seconds the emitter wil run. -1 means 'forever' */
	CC_PROPERTY(float, m_fDuration, Duration)
	/** sourcePosition of the emitter */
	CC_PROPERTY_PASS_BY_REF(CCPoint, m_tSourcePosition, SourcePosition)
	/** Position variance of the emitter */
	CC_PROPERTY_PASS_BY_REF(CCPoint, m_tPosVar, PosVar)
	/** life, and life variation of each particle */
	CC_PROPERTY(float, m_fLife, Life)
	/** life variance of each particle */
	CC_PROPERTY(float, m_fLifeVar, LifeVar)
	/** angle and angle variation of each particle */
	CC_PROPERTY(float, m_fAngle, Angle)
	/** angle variance of each particle */
	CC_PROPERTY(float, m_fAngleVar, AngleVar)

//////////////////////////////////////////////////////////////////////////
public:
	// mode A
	virtual const CCPoint& getGravity();
	virtual void setGravity(const CCPoint& g);
	virtual float getSpeed();
	virtual void setSpeed(float speed);
	virtual float getSpeedVar();
	virtual void setSpeedVar(float speed);
	virtual float getTangentialAccel();
	virtual void setTangentialAccel(float t);
	virtual float getTangentialAccelVar();
	virtual void setTangentialAccelVar(float t);
	virtual float getRadialAccel();
	virtual void setRadialAccel(float t);
	virtual float getRadialAccelVar();
	virtual void setRadialAccelVar(float t);
	// mode B
	virtual float getStartRadius();
	virtual void setStartRadius(float startRadius);
	virtual float getStartRadiusVar();
	virtual void setStartRadiusVar(float startRadiusVar);
	virtual float getEndRadius();
	virtual void setEndRadius(float endRadius);
	virtual float getEndRadiusVar();
	virtual void setEndRadiusVar(float endRadiusVar);
	virtual float getRotatePerSecond();
	virtual void setRotatePerSecond(float degrees);
	virtual float getRotatePerSecondVar();
	virtual void setRotatePerSecondVar(float degrees);

	void setZOrder(int z);
	virtual void setScale(float s);
	virtual void setRotation(float newRotation);
	virtual void setScaleX(float newScaleX);
	virtual void setScaleY(float newScaleY);
//////////////////////////////////////////////////////////////////////////
	
	/** start size in pixels of each particle */
	CC_PROPERTY(float, m_fStartSize, StartSize)
	/** size variance in pixels of each particle */
	CC_PROPERTY(float, m_fStartSizeVar, StartSizeVar)
	/** end size in pixels of each particle */
	CC_PROPERTY(float, m_fEndSize, EndSize)
	/** end size variance in pixels of each particle */
	CC_PROPERTY(float, m_fEndSizeVar, EndSizeVar)
	/** start color of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tStartColor, StartColor)
	/** start color variance of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tStartColorVar, StartColorVar)
	/** end color and end color variation of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tEndColor, EndColor)
	/** end color variance of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tEndColorVar, EndColorVar)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fStartSpin, StartSpin)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fStartSpinVar, StartSpinVar)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fEndSpin, EndSpin)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fEndSpinVar, EndSpinVar)
	/** emission rate of the particles */
	CC_PROPERTY(float, m_fEmissionRate, EmissionRate)
	/** maximum particles of the system */
	CC_PROPERTY(unsigned int, m_uTotalParticles, TotalParticles)
	/** conforms to CocosNodeTexture protocol */
	CC_PROPERTY(CCTexture2D*, m_pTexture, Texture)
	/** conforms to CocosNodeTexture protocol */
	CC_PROPERTY(ccBlendFunc, m_tBlendFunc, BlendFunc)
	/** whether or not the particles are using blend additive.
	If enabled, the following blending function will be used.
	@code
	source blend function = GL_SRC_ALPHA;
	dest blend function = GL_ONE;
	@endcode
	*/
	CC_PROPERTY(bool, m_bIsBlendAdditive, IsBlendAdditive)
	/** particles movement type: Free or Grouped
	@since v0.8
	*/
	CC_PROPERTY(tCCPositionType, m_ePositionType, PositionType)
	/** whether or not the node will be auto-removed when it has no particles left.
	By default it is false.
	@since v0.8
	*/
	CC_PROPERTY(bool, m_bIsAutoRemoveOnFinish, IsAutoRemoveOnFinish)
	/** Switch between different kind of emitter modes:
	- kCCParticleModeGravity: uses gravity, speed, radial and tangential acceleration
	- kCCParticleModeRadius: uses radius movement + rotation
	*/
	CC_PROPERTY(int, m_nEmitterMode, EmitterMode)

public:
	CCParticleSystem();
	virtual ~CCParticleSystem();
	/** creates an initializes a CCParticleSystem from a plist file.
	This plist files can be creted manually or with Particle Designer:
	http://particledesigner.71squared.com/
	@since v0.99.3
	*/
	static CCParticleSystem * particleWithFile(const char *plistFile);

	/** initializes a CCParticleSystem*/
	bool init();
	/** initializes a CCParticleSystem from a plist file.
	This plist files can be creted manually or with Particle Designer:
	http://particledesigner.71squared.com/
	@since v0.99.3
	*/
	bool initWithFile(const char *plistFile);

	/** initializes a CCQuadParticleSystem from a CCDictionary.
	@since v0.99.3
	*/
	bool initWithDictionary(CCDictionary *dictionary);

	//! Initializes a system with a fixed number of particles
	virtual bool initWithTotalParticles(unsigned int numberOfParticles);
	//! Add a particle to the emitter
	bool addParticle();
	//! Initializes a particle
	void initParticle(tCCParticle* particle);
	//! stop emitting particles. Running particles will continue to run until they die
	void stopSystem();
	//! Kill all living particles.
	void resetSystem();
	//! whether or not the system is full
	bool isFull();

	//! should be overriden by subclasses
	virtual void updateQuadWithParticle(tCCParticle* particle, const CCPoint& newPosition);
	//! should be overriden by subclasses
	virtual void postStep();

	virtual void update(ccTime dt);
	virtual void updateWithNoTime(void);
private:
	/** Private method, return the string found by key in dict.
	@return "" if not found; return the string if found.
	*/
	inline const char * valueForKey(const char *key, CCDictionary *dict)
	{
		if (dict)
		{
			CCString *pString = (CCString*)dict->objectForKey(key);
			return pString ? pString->m_sString.c_str() : "";
		}
		return "";
	}
};

NS_CC_END

#endif //__CCPARTICLE_SYSTEM_H__