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#ifndef __GLGRAPHICS_GLVIEWCONTROLLER_H__
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#define __GLGRAPHICS_GLVIEWCONTROLLER_H__
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#include <fstream>
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#include "QuatTrackBall.h"
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namespace GLGraphics
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{
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	/** The GLViewController is a more high level component than a trackball.
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		The idea behind GLViewController is to handle setting up the projection
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		and changing the viewport when the window is reshaped. Basically the raw
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		mouse position and related info is sent to the view controller which takes
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		care of the rest.
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		*/
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	class GLViewController
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	{
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		float FOV_DEG;
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		int WINX, WINY;
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		float znear, zfar;
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		float aspect;
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		bool button_down;
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		TrackBallAction last_action;
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		bool spin;
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		QuatTrackBall ball;
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	public:
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		/** Constructor which accepts the window dimensions as well as the world center and the
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			radius which should be construed as the distance to the observer */
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		GLViewController(int _WINX, int _WINY,
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										 const CGLA::Vec3f& _centre, float _rad);
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		/// Grab ball takes an action and a mouse position.
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		void grab_ball(TrackBallAction action, const CGLA::Vec2i& pos);
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		/// Roll virtual trackball (pass just mouse position).
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		void roll_ball(const CGLA::Vec2i& pos);
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		/// Release the virtual trackball
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		void release_ball();
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		/// Try to spind the trackball - called from idle.
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		bool try_spin();
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		/// Setup GL modelview matrix.
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		void set_gl_modelview();
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		/// Reset projection. Called initially, when window size has changed or when user zooms.
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		void reset_projection();
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		/// Reshape window.
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		void reshape(int W, int H);
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		/// Set near and far planes.
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		void set_near_and_far();
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		/// Set centre of ball.
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		void set_centre(const CGLA::Vec3f& c)
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		{
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			ball.set_centre(c);
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		}
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		/// Set eye distance.
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		void set_eye_dist(float rad)
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		{
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			ball.set_eye_dist(rad);
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			set_near_and_far();
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		}
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		/// Returns eye distance
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		float get_eye_dist() const
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		{
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			return ball.get_eye_dist();
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		}
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		/// Get viewing parameters: eye, centre, up
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		void get_view_param(CGLA::Vec3f& e, CGLA::Vec3f& c, CGLA::Vec3f& u) const
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		{
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			ball.get_view_param(e,c,u);
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		}
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		/// Load trackball from stream
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		bool load(std::ifstream&);
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		/// Save trackball to stream.
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		bool save(std::ofstream&) const;
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	};
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}
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#endif