/*
    QGLView
    Copyright (C) 2012  Ivan Pelipenko peri4ko@gmail.com

    This program 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.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef GLPARTICLES_SYSTEM_H
#define GLPARTICLES_SYSTEM_H

#include <QMutex>
#include "gltexture_manager.h"
#include "globject.h"
#include "glcamera.h"

class GLParticlesSystem: public QObject, public GLObjectBase
{
	Q_OBJECT
	Q_PROPERTY(float birthRate READ birthRate WRITE setBirthRate)
	Q_PROPERTY(float lifeDuration READ lifeDuration WRITE setLifeDuration)
	Q_PROPERTY(float size READ size WRITE setSize)
	Q_PROPERTY(float enlargeSpeed READ enlargeSpeed WRITE setEnlargeSpeed)
	Q_PROPERTY(float initialAngle READ initialAngle WRITE setInitialAngle)
	Q_PROPERTY(float initialSpeed READ initialSpeed WRITE setInitialSpeed)
	Q_PROPERTY(float speedDecay READ speedDecay WRITE setSpeedDecay)
	Q_PROPERTY(float baseAngle READ baseAngle WRITE setBaseAngle)
	Q_PROPERTY(QVector3D speedDirection READ speedDirection WRITE setSpeedDirection)
	Q_PROPERTY(QVector3D emitterPosition READ emitterPosition WRITE setEmitterPosition)
	Q_PROPERTY(QVector3D emitterDirection READ emitterDirection WRITE setEmitterDirection)
	Q_PROPERTY(float lifeDurationJitter READ lifeDurationJitter WRITE setLifeDurationJitter)
	Q_PROPERTY(float speedJitter READ speedJitter WRITE setSpeedJitter)
	Q_PROPERTY(float speedDirectionJitter READ speedDirectionJitter WRITE setSpeedDirectionJitter)
	Q_PROPERTY(float sizeJitter READ sizeJitter WRITE setSizeJitter)
	Q_PROPERTY(float enlargeSpeedJitter READ enlargeSpeedJitter WRITE setEnlargeSpeedJitter)
	Q_PROPERTY(float angleJitter READ angleJitter WRITE setAngleJitter)
	Q_PROPERTY(bool active READ isActive WRITE setActive)
	Q_PROPERTY(bool birthEnabled READ isBirthEnabled WRITE setBirthEnabled)
	Q_PROPERTY(float fadeTime READ fadeTime WRITE setFadeTime)
public:
	GLParticlesSystem(const QVector3D & pos = QVector3D());
	~GLParticlesSystem() {;}

	enum Type {Cone, Omni, Box};

	struct Particle {
		Particle(float life_dur = 40.);
		QVector3D pos;
		QVector3D pos_h;
		QVector3D speed;
		QRectF tex_rect;
		float speedDecay;
		float size;
		float angle;
		float enlargeSpeed;
		float lifeDuration;
		float lifeCurrent;
		float animationFrameRate;
	};

	void update();
	void draw(QGLShaderProgram * prog, bool);

	float birthRate() const {return birthRate_;}
	float lifeDuration() const {return lifeDuration_;}
	float size() const {return size_;}
	float enlargeSpeed() const {return enlargeSpeed_;}
	float initialAngle() const {return initialAngle_;}
	float initialSpeed() const {return initialSpeed_;}
	float speedDecay() const {return speedDecay_;}
	float baseAngle() const {return baseAngle_;}
	QVector3D speedDirection() const {return speedDirection_;}
	QVector3D emitterPosition() const {return emitterPosition_;}
	QVector3D emitterDirection() const {return emitterDirection_;}
	Box3D emitterRect() const {return emitterRect_;}
	float lifeDurationJitter() const {return lifeDurationJitter_;}
	float speedJitter() const {return speedJitter_;}
	float speedDirectionJitter() const {return speedDirectionJitter_;}
	float sizeJitter() const {return sizeJitter_;}
	float enlargeSpeedJitter() const {return enlargeSpeedJitter_;}
	float angleJitter() const {return angleJitter_;}
	bool isActive() const {return active_;}
	bool isBirthEnabled() const {return birthEnabled_;}
	GLParticlesSystem::Type emitterType() const {return emitterType_;}
	float fadeTime() const {return fade_time;}
	bool isAddVerticalFaceEnabled() const {return add_vert_face;}

	void setBirthRate(const float & arg) {birthRate_ = arg; tick_birth = birthRate_ / freq;}
	void setLifeDuration(const float & arg) {lifeDuration_ = arg;}
	void setSize(const float & arg) {size_ = arg;}
	void setEnlargeSpeed(const float & arg) {enlargeSpeed_ = arg;}
	void setInitialAngle(const float & arg) {initialAngle_ = arg;}
	void setInitialSpeed(const float & arg) {initialSpeed_ = arg;}
	void setBaseAngle(const float & arg) {baseAngle_ = arg;}
	void setSpeedDecay(const float & arg) {speedDecay_ = arg;}
	void setSpeedDirection(const QVector3D & arg) {speedDirection_ = arg;}
	void setEmitterPosition(const QVector3D & arg) {emitterPosition_ = arg;}
	void setEmitterDirection(const QVector3D & arg) {emitterDirection_ = arg.normalized();}
	void setEmitterRect(const Box3D & arg) {emitterRect_ = arg;}
	void setLifeDurationJitter(const float & arg) {lifeDurationJitter_ = arg;}
	void setSpeedJitter(const float & arg) {speedJitter_ = arg;}
	void setSpeedDirectionJitter(const float & arg) {speedDirectionJitter_ = arg;}
	void setSizeJitter(const float & arg) {sizeJitter_ = arg;}
	void setEnlargeSpeedJitter(const float & arg) {enlargeSpeedJitter_ = arg;}
	void setActive(const bool & arg) {active_ = arg;}
	void setAngleJitter(const float & arg) {angleJitter_ = arg;}
	void setBirthEnabled(const bool & arg) {birthEnabled_ = arg;}
	void setEmitterType(const GLParticlesSystem::Type & arg) {emitterType_ = arg;}
	void setFadeTime(const float & arg) {fade_time = arg;}
	void setAddVerticalFaceEnabled(const bool & arg) {add_vert_face = arg;}
	void setTextureRect(const QRectF & arg) {tex_rect = arg;}
	void setTextureScale(const float & x, const float & y) {tex_scale = QSizeF(x, y);}
	void setTextureScale(const QSizeF & arg) {tex_scale = arg;}

	void addForce(const QVector3D & f) {forces << f;}
	void birthParticles(int count) {need_birth += count;}

	float frequency() const {return freq;}
	void setFrequency(const float & f) {freq = f;}

	float additionalSpeed;

private:
	QVector3D speedDirection_, emitterPosition_, emitterDirection_;
	QRectF tex_rect;
	QSizeF tex_scale;
	Box3D emitterRect_;
	QMutex mutex;
	GLParticlesSystem::Type emitterType_;
	GLTextureManager::Animation * animation;
	QVector<GLfloat> vertices, texcoords, colors;
	QVector<Particle> particles;
	QVector<QVector3D> forces;
	float birthRate_, initialSpeed_, speedDecay_, lifeDuration_, size_, freq, need_birth, tick_birth, tick_life, fade_time;
	float lifeDurationJitter_, speedJitter_, speedDirectionJitter_, sizeJitter_, angleJitter_, initialAngle_;
	float enlargeSpeed_, enlargeSpeedJitter_, baseAngle_;
	bool active_, birthEnabled_, is_diffuse_anim, add_vert_face;

};

inline bool operator <(const GLParticlesSystem::Particle & f, const GLParticlesSystem::Particle & s) {return f.pos_h.z() > s.pos_h.z();}

#endif // GLPARTICLES_SYSTEM_H