#ifndef MANIPULATORS_H_
#define MANIPULATORS_H_

/* greebo: This file contains the manipulator classes like
 *
 * - Translate Maniplator
 * - Rotate Manipulator
 * - Scale Manipulator
 * - Drag Manipulator
 * - Clip Manipulator
 *
 * that derive from the abstract base class Manipulator
 *
 * A Manipulator consists of several Manipulatables (e.g. a circle for the rotation manipulators) that
 * themselves derive from the Abstract Base Class <Manipulatable>
 */

#include "pivot.h"
#include "../camera/view.h"
#include "math/matrix.h"
#include "selectionlib.h"
#include "Manipulatables.h"
#include "Renderables.h"

struct Pivot2World
{
		Matrix4 m_worldSpace;
		Matrix4 m_viewpointSpace;
		Matrix4 m_viewplaneSpace;
		Vector3 m_axis_screen;

		void update (const Matrix4& pivot2world, const Matrix4& modelview, const Matrix4& projection,
				const Matrix4& viewport)
		{
			Pivot2World_worldSpace(m_worldSpace, pivot2world, modelview, projection, viewport);
			Pivot2World_viewpointSpace(m_viewpointSpace, m_axis_screen, pivot2world, modelview, projection, viewport);
			Pivot2World_viewplaneSpace(m_viewplaneSpace, pivot2world, modelview, projection, viewport);
		}
};

// The abstract base class for a manipulator
class Manipulator
{
	public:
		virtual Manipulatable* GetManipulatable () = 0;
		virtual void testSelect (const View& view, const Matrix4& pivot2world)
		{
		}
		// This function is responsible for bringing the visual representation
		// of this manipulator onto the screen
		virtual void render (Renderer& renderer, const VolumeTest& volume, const Matrix4& pivot2world)
		{
		}
		virtual void setSelected (bool select) = 0;
		virtual bool isSelected () const = 0;
		virtual ~Manipulator ();
};

// =======================================================================================

/*	The Manipulator for Rotations
 */
class RotateManipulator: public Manipulator
{

		// helper class for rendering a circle
		struct RenderableCircle: public OpenGLRenderable
		{
				Array<PointVertex> m_vertices;

				RenderableCircle (std::size_t size) :
					m_vertices(size)
				{
				}
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_vertices.data()->colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_vertices.data()->vertex);
					glDrawArrays(GL_LINE_LOOP, 0, GLsizei(m_vertices.size()));
				}
				void setColour (const Colour4b& colour)
				{
					for (Array<PointVertex>::iterator i = m_vertices.begin(); i != m_vertices.end(); ++i) {
						(*i).colour = colour;
					}
				}
		};

		// helper class for rendering a semi-circle
		struct RenderableSemiCircle: public OpenGLRenderable
		{
				Array<PointVertex> m_vertices;

				RenderableSemiCircle (std::size_t size) :
					m_vertices(size)
				{
				}
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_vertices.data()->colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_vertices.data()->vertex);
					glDrawArrays(GL_LINE_STRIP, 0, GLsizei(m_vertices.size()));
				}
				void setColour (const Colour4b& colour)
				{
					for (Array<PointVertex>::iterator i = m_vertices.begin(); i != m_vertices.end(); ++i) {
						(*i).colour = colour;
					}
				}
		};

		RotateFree m_free;
		RotateAxis m_axis;
		Vector3 m_axis_screen;
		RenderableSemiCircle m_circle_x;
		RenderableSemiCircle m_circle_y;
		RenderableSemiCircle m_circle_z;
		RenderableCircle m_circle_screen;
		RenderableCircle m_circle_sphere;
		SelectableBool m_selectable_x;
		SelectableBool m_selectable_y;
		SelectableBool m_selectable_z;
		SelectableBool m_selectable_screen;
		SelectableBool m_selectable_sphere;
		Pivot2World m_pivot;
		Matrix4 m_local2world_x;
		Matrix4 m_local2world_y;
		Matrix4 m_local2world_z;
		bool m_circle_x_visible;
		bool m_circle_y_visible;
		bool m_circle_z_visible;

	public:
		static Shader* m_state_outer;

		// Constructor
		RotateManipulator (Rotatable& rotatable, std::size_t segments, float radius);

		void UpdateColours ();
		void updateCircleTransforms ();

		void render (Renderer& renderer, const VolumeTest& volume, const Matrix4& pivot2world);

		void testSelect (const View& view, const Matrix4& pivot2world);

		Manipulatable* GetManipulatable ();

		void setSelected (bool select);
		bool isSelected () const;
};

// =======================================================================================

/* The Manipulator for translation operations
 */
class TranslateManipulator: public Manipulator
{
		// Helper class
		struct RenderableArrowLine: public OpenGLRenderable
		{
				PointVertex m_line[2];

				RenderableArrowLine ()
				{
				}
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_line[0].colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_line[0].vertex);
					glDrawArrays(GL_LINES, 0, 2);
				}
				void setColour (const Colour4b& colour)
				{
					m_line[0].colour = colour;
					m_line[1].colour = colour;
				}
		};

		// Helper class
		struct RenderableArrowHead: public OpenGLRenderable
		{
				Array<FlatShadedVertex> m_vertices;

				RenderableArrowHead (std::size_t size) :
					m_vertices(size)
				{
				}
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(FlatShadedVertex), &m_vertices.data()->colour);
					glVertexPointer(3, GL_FLOAT, sizeof(FlatShadedVertex), &m_vertices.data()->vertex);
					glNormalPointer(GL_FLOAT, sizeof(FlatShadedVertex), &m_vertices.data()->normal);
					glDrawArrays(GL_TRIANGLES, 0, GLsizei(m_vertices.size()));
				}
				void setColour (const Colour4b& colour)
				{
					for (Array<FlatShadedVertex>::iterator i = m_vertices.begin(); i != m_vertices.end(); ++i) {
						(*i).colour = colour;
					}
				}
		};

		// Helper class
		struct RenderableQuad: public OpenGLRenderable
		{
				PointVertex m_quad[4];
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_quad[0].colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_quad[0].vertex);
					glDrawArrays(GL_LINE_LOOP, 0, 4);
				}
				void setColour (const Colour4b& colour)
				{
					m_quad[0].colour = colour;
					m_quad[1].colour = colour;
					m_quad[2].colour = colour;
					m_quad[3].colour = colour;
				}
		};

		TranslateFree m_free;
		TranslateAxis m_axis;
		RenderableArrowLine m_arrow_x;
		RenderableArrowLine m_arrow_y;
		RenderableArrowLine m_arrow_z;
		RenderableArrowHead m_arrow_head_x;
		RenderableArrowHead m_arrow_head_y;
		RenderableArrowHead m_arrow_head_z;
		RenderableQuad m_quad_screen;
		SelectableBool m_selectable_x;
		SelectableBool m_selectable_y;
		SelectableBool m_selectable_z;
		SelectableBool m_selectable_screen;
		Pivot2World m_pivot;
	public:
		static Shader* m_state_wire;
		static Shader* m_state_fill;

		// Constructor
		TranslateManipulator (Translatable& translatable, std::size_t segments, float length);

		void UpdateColours ();
		bool manipulator_show_axis (const Pivot2World& pivot, const Vector3& axis);

		void render (Renderer& renderer, const VolumeTest& volume, const Matrix4& pivot2world);
		void testSelect (const View& view, const Matrix4& pivot2world);
		Manipulatable* GetManipulatable ();

		void setSelected (bool select);
		bool isSelected () const;
}; // class TranslateManipulator

// =======================================================================================

/* The Manipulator for scale operations
 */
class ScaleManipulator: public Manipulator
{
		// Helper class
		struct RenderableArrow: public OpenGLRenderable
		{
				PointVertex m_line[2];

				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_line[0].colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_line[0].vertex);
					glDrawArrays(GL_LINES, 0, 2);
				}
				void setColour (const Colour4b& colour)
				{
					m_line[0].colour = colour;
					m_line[1].colour = colour;
				}
		};

		// Helper class
		struct RenderableQuad: public OpenGLRenderable
		{
				PointVertex m_quad[4];
				void render (RenderStateFlags state) const
				{
					glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(PointVertex), &m_quad[0].colour);
					glVertexPointer(3, GL_FLOAT, sizeof(PointVertex), &m_quad[0].vertex);
					glDrawArrays(GL_QUADS, 0, 4);
				}
				void setColour (const Colour4b& colour)
				{
					m_quad[0].colour = colour;
					m_quad[1].colour = colour;
					m_quad[2].colour = colour;
					m_quad[3].colour = colour;
				}
		};

		ScaleFree m_free;
		ScaleAxis m_axis;
		RenderableArrow m_arrow_x;
		RenderableArrow m_arrow_y;
		RenderableArrow m_arrow_z;
		RenderableQuad m_quad_screen;
		SelectableBool m_selectable_x;
		SelectableBool m_selectable_y;
		SelectableBool m_selectable_z;
		SelectableBool m_selectable_screen;
		Pivot2World m_pivot;

	public:

		// Constructor
		ScaleManipulator (Scalable& scalable, std::size_t segments, float length);

		Pivot2World& getPivot ()
		{
			return m_pivot;
		}

		void UpdateColours ();

		void render (Renderer& renderer, const VolumeTest& volume, const Matrix4& pivot2world);
		void testSelect (const View& view, const Matrix4& pivot2world);
		Manipulatable* GetManipulatable ();

		void setSelected (bool select);
		bool isSelected () const;

}; // class ScaleManipulator

// =======================================================================================

class DragManipulator : public Manipulator
{
  TranslateFree _freeResize;
  TranslateFree _freeDrag;
  ResizeTranslatable _resizeTranslatable;
  DragTranslatable _dragTranslatable;
  SelectableBool _dragSelectable;
public:
  bool _selected;

  DragManipulator() : _freeResize(_resizeTranslatable), _freeDrag(_dragTranslatable), _selected(false) {}

  Manipulatable* GetManipulatable();
  void testSelect(const View& view, const Matrix4& pivot2world);

  void setSelected(bool select);
  bool isSelected() const;
}; // class DragManipulator

// =======================================================================================

class ClipManipulator : public Manipulator {
public:
  Manipulatable* GetManipulatable() {
    ERROR_MESSAGE("clipper is not manipulatable");
    return 0;
  }

  void setSelected(bool select) {}
  bool isSelected() const {
    return false;
  }
}; // class ClipManipulator

#endif /*MANIPULATORS_H_*/
