/*
    GLObjectBase & Light
    Ivan Pelipenko peri4ko@yandex.ru

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef GLOBJECT_H
#define GLOBJECT_H

#include "glvbo.h"
#include "glframebuffer.h"
#include "glmaterial.h"

class Camera;
class QGLView;

class GLObjectBase
{
	friend class QGLView;
	friend class GLRendererBase;
	friend QDataStream & operator <<(QDataStream & s, const GLObjectBase * p);
	friend QDataStream & operator >>(QDataStream & s, GLObjectBase *& p);
	friend GLObjectBase * loadFromQGLFile(const QString & filepath);
public:
	enum Type {glMesh, glLight, glCamera, glParticlesSystem};
	enum Pass {Solid, Transparent, Reflection, User};
	enum GeomPrimitives {Triangles = GL_TRIANGLES, Quads = GL_QUADS};
	enum RenderMode {View = 0, Point = GL_POINT, Line = GL_LINE, Fill = GL_FILL};

	explicit GLObjectBase();
	virtual ~GLObjectBase();

	virtual GLObjectBase * clone(bool withChildren = true);

	QString name() const {return name_;}
	void setName(const QString & name) {name_ = name;}
	//virtual GLuint hList() {return list;}
	virtual void init();
	virtual void draw(QOpenGLShaderProgram * prog, bool simplest = false);
	virtual void update() {}
	bool isInit() const {return is_init;}
	bool isTexturesLoaded() const {return is_tex_loaded;}
	Type type() const {return type_;}

	RenderMode renderMode() const {return render_mode;}
	void setRenderMode(RenderMode mode) {render_mode = mode;}

	float lineWidth() const {return line_width;}
	void setLineWidth(const float & width) {line_width = width;}

	GLObjectBase * parent() {return parent_;}
	void setParent(GLObjectBase * o) {parent_ = o;}
	bool hasParent() const {return parent_ != nullptr;}
	bool hasChildren() const {return children_.size() != 0;}
	void setView(QGLView * v);

	void addChild(GLObjectBase * o);
	void removeChild(GLObjectBase * o);
	void removeChild(int index);
	void clearChildren(bool deleteAll = false);
	int childCount() const {return children_.size();}
	GLObjectBase * child(int index);
	GLObjectBase * child(const QString & name);
	const GLObjectBase * child(int index) const;
	const GLObjectBase * child(const QString & name) const;
	QList<GLObjectBase * > children(bool all_ = false);

	bool isVisible() const {return visible_;}
	bool isHidden() const {return !visible_;}
	void setVisible(bool v) {visible_ = v;}
	void setHidden(bool v) {visible_ = !v;}
	void show() {visible_ = true;}
	void hide() {visible_ = false;}

	bool isReceiveShadows() const {return rec_shadow;}
	bool isCastShadows() const {return cast_shadow;}
	void setReceiveShadows(bool on) {rec_shadow = on;}
	void setCastShadows(bool on) {cast_shadow = on;}

	void move(const QVector3D & dv) {pos_ += dv; buildTransform();}
	void moveTo(const QVector3D & dv) {pos_ = dv; buildTransform();}
	void move(GLfloat dx, GLfloat dy, GLfloat dz = 0.) {move(QVector3D(dx, dy, dz)); buildTransform();}
	void moveTo(GLfloat dx, GLfloat dy, GLfloat dz = 0.) {moveTo(QVector3D(dx, dy, dz)); buildTransform();}
	void moveX(GLfloat o) {pos_.setX(pos_.x() + o); buildTransform();}
	void moveY(GLfloat o) {pos_.setY(pos_.y() + o); buildTransform();}
	void moveZ(GLfloat o) {pos_.setZ(pos_.z() + o); buildTransform();}
	void setPosX(GLfloat o) {pos_.setX(o); buildTransform();}
	void setPosY(GLfloat o) {pos_.setY(o); buildTransform();}
	void setPosZ(GLfloat o) {pos_.setZ(o); buildTransform();}
	void setPos(GLfloat x, GLfloat y, GLfloat z) {pos_ = QVector3D(x, y, z); buildTransform();}
	void setPos(const QVector3D & p) {pos_ = p; buildTransform();}
	void resetPos() {pos_ = QVector3D(0., 0., 0.); buildTransform();}

	QVector3D pos() const {return pos_;}
	float posX() const {return pos_.x();}
	float posY() const {return pos_.y();}
	float posZ() const {return pos_.z();}
	QVector3D worldPos() const {return (itransform_ * QVector4D(0, 0, 0, 1.)).toVector3D();}
	QMatrix4x4 worldTransform() const {return itransform_;}

	QVector3D rotation() const {return angles_;}
	float rotationX() const {return angles_.x();}
	float rotationY() const {return angles_.y();}
	float rotationZ() const {return angles_.z();}
	void rotateX(GLfloat a);
	void rotateY(GLfloat a);
	void rotateZ(GLfloat a);
	void setRotationX(GLfloat a);
	void setRotationY(GLfloat a);
	void setRotationZ(GLfloat a);
	void setRotation(const QVector3D & a);
	void resetRotation();

	QVector3D scale() {return scale_;}
	float scaleX() {return scale_.x();}
	float scaleY() {return scale_.y();}
	float scaleZ() {return scale_.z();}
	void scale(const QVector3D & sv) {raw_matrix = false; scale_ *= sv; buildTransform();}
	void scale(GLfloat sx, GLfloat sy, GLfloat sz) {raw_matrix = false; scale(QVector3D(sx, sy, sz)); buildTransform();}
	void scale(GLfloat sx, GLfloat sy) {raw_matrix = false; scale(QVector3D(sx, sy, sy)); buildTransform();}
	void scale(GLfloat sx) {raw_matrix = false; scale(QVector3D(sx, sx, sx)); buildTransform();}
	void scaleX(GLfloat a) {raw_matrix = false; scale_.setX(scale_.x() + a); buildTransform();}
	void scaleY(GLfloat a) {raw_matrix = false; scale_.setY(scale_.y() + a); buildTransform();}
	void scaleZ(GLfloat a) {raw_matrix = false; scale_.setZ(scale_.z() + a); buildTransform();}
	void setScale(const QVector3D & a) {raw_matrix = false; scale_ = a; buildTransform();}
	void setScale(GLfloat a) {raw_matrix = false; scale_ = QVector3D(a, a, a); buildTransform();}
	void setScaleX(GLfloat a) {raw_matrix = false; scale_.setX(a); buildTransform();}
	void setScaleY(GLfloat a) {raw_matrix = false; scale_.setY(a); buildTransform();}
	void setScaleZ(GLfloat a) {raw_matrix = false; scale_.setZ(a); buildTransform();}
	void resetScale() {raw_matrix = false; scale_ = QVector3D(1., 1., 1.); buildTransform();}
	
	QMatrix4x4 transform() {return mat_;}
	void setTransform(const QMatrix4x4 & t);
	bool isRawMatrix() {return raw_matrix;}

	bool isAcceptLight() const {return accept_light;}
	void setAcceptLight(bool yes) {accept_light = yes;}

	bool isAcceptFog() const {return accept_fog;}
	void setAcceptFog(bool yes) {accept_fog = yes;}

	bool isSelected() const {return selected_;}
	void setSelected(bool yes) {selected_ = yes;}
	void select();
	void deselect() {selected_ = false;}

	bool isSelectable() const {return select_;}
	void setSelectable(bool yes) {select_ = yes;}
	/*
	bool isWriteDepth() const {return write_depth_;}
	void setWriteDepth(bool yes) {write_depth_ = yes;}*/

	QColor color() const {return material_.color_diffuse;}
	void setColor(const QColor & c) {material_.color_diffuse = c; checkPass();}

	GLenum srcAlpha() const {return blend_src;}
	GLenum destAlpha() const {return blend_dest;}
	void setSrcAlpha(GLenum mode) {blend_src = mode;}
	void setDestAlpha(GLenum mode) {blend_dest = mode;}

	void setMaterial(const Material & m, bool with_children = false);
	Material & material() {return material_;}

	const Box3D & boundingBox(bool withChildren = true) const {return bound;}
	GLVBO & VBO() {return vbo;}

	void calculateBoundingBox();

	void setProperty(const QString & pn, const QVariant & v);
	QVariant property(const QString & pn, bool * exists = 0) const;
	bool hasProperty(const QString & pn) const;
	void removeProperty(const QString & pn);

	QVector3D pos_h;
	QVector<Vector3d> points, puvws;
	QVector<Vector3i> faces, uvws, norms;
	QVector<Vector3d> normals;

	//QVector<GLfloat> d_vertices, d_normals, d_uvs;

protected:
	void addChildren(QList<GLObjectBase * > & list, GLObjectBase * where);
	void loadTextures(bool with_children = false);
	//void deleteTextures() {foreach (GLuint i, textures) currentQGLView->deleteTexture(i); textures.clear();}
	void buildTransform();
	void initInternal();
	void render(int * id = nullptr, QMap<int, GLObjectBase * > * ids = nullptr, int sh_id_loc = 0);
	void checkPass();
	virtual void localTransform(QMatrix4x4 & m);
	QMatrix4x4 worldMatrix(QMatrix4x4 parent) const;

	int pass_; // Pass
	bool is_init, is_tex_loaded, accept_light, accept_fog, /*write_depth_,*/ visible_, cast_shadow, rec_shadow, select_, selected_, raw_matrix;
	bool is_root;
	float line_width;
	Type type_;
	GeomPrimitives geom_prim;
	RenderMode render_mode;
	Material material_;
	Box3D bound;
	QVector3D pos_, angles_, scale_;
	QList<GLObjectBase * > children_;
	QList<GLuint> textures;
	QMatrix4x4 itransform_, mat_;
	//QColor color_;
	QString name_;
	GLenum blend_src, blend_dest;
	GLObjectBase * parent_;
	QGLViewBase * view_;
	GLVBO vbo;
	QVariantMap meta;

};

inline bool operator <(const GLObjectBase & f, const GLObjectBase & s) {return f.pos_h.z() < s.pos_h.z();}

class Light: public GLObjectBase {
	friend class QGLView;
	friend class GLRendererBase;
public:
	enum Type {Omni, Directional, Cone};

	Light();
	Light(const QVector3D & p, const QColor & c = Qt::white, float i = 1.);
	virtual GLObjectBase * clone(bool withChildren = true);
	virtual void init() {shadow_map.resize(512, 512); is_init = true;}
	virtual void draw(QOpenGLShaderProgram * prog, bool simplest = false);

	QVector3D direction, dir0, dir1;
	float angle_start;
	float angle_end;
	float intensity;
	float decay_const;
	float decay_linear;
	float decay_quadratic;
	float decay_start;
	float decay_end;
	Type light_type;
	GLFramebuffer shadow_map;
	QMatrix4x4 shadow_matrix;

protected:

};

template <class T>
inline T globject_cast(GLObjectBase * object) {return reinterpret_cast<T>(object);}

template <class T>
inline T globject_cast(const GLObjectBase * object) {return reinterpret_cast<T>(object);}


QDataStream & operator <<(QDataStream & s, const GLObjectBase * p);
QDataStream & operator >>(QDataStream & s, GLObjectBase *& p);

#endif // GLOBJECT_H