/**
	This file is a part of our_dick
	Copyright (C) 2020 rexy712

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

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

#ifndef OUR_DICK_ENGINE_OBJECT_HPP
#define OUR_DICK_ENGINE_OBJECT_HPP

#include "gfx/ogl/gl_include.hpp" //GLfloat
#include "math/math.hpp"
#include "base_types.hpp"

namespace egn{

	class object_base
	{
	protected:
		enum update{
			NO_UPDATE,
			SCALE_UPDATE = 1,
			TRANSLATION_UPDATE = 2,
			ROTATION_UPDATE = 4,
			BOUNDING_VOLUME_UPDATE = 8,
		};
	protected:
		math::vec3<GLfloat> m_position;                //track current positon in world space
		math::quaternion<GLfloat> m_orientation;       //track current model space rotation
		math::vec3<GLfloat> m_scale{1.0f, 1.0f, 1.0f}; //track model space scale
	private:
		mutable math::mat4<GLfloat> m_model_matrix;    //compile all the above info into a matrix
	protected:
		mutable int m_update_flag = NO_UPDATE;         //whether or not to update the matrix upon access
		                                               //make the update flag protected so subclasses can share it

	public:
		object_base() = default;
		explicit object_base(const math::vec3<GLfloat>& position);
		object_base(const math::vec3<GLfloat>& position, const math::quaternion<GLfloat>& orientation);
		object_base(const object_base&) = default;
		object_base(object_base&&) = default;
		virtual ~object_base() = default;

		object_base& operator=(const object_base&) = default;
		object_base& operator=(object_base&&) = default;

		void translate(const math::vec3<GLfloat>& distance);
		void rotate(const math::quaternion<GLfloat>& distance);
		void scale(const math::vec3<GLfloat>& distance);
		void look_at(const math::vec3<GLfloat>& targ, const math::vec3<GLfloat>& up);

		virtual void set_position(const math::vec3<GLfloat>& pos);
		virtual void set_orientation(const math::quaternion<GLfloat>& orient);
		virtual void set_scale(const math::vec3<GLfloat>& scale);

		const math::mat4<GLfloat>& model_matrix()const;
		const math::vec3<GLfloat>& position()const;
		const math::vec3<GLfloat>& scale()const;
		const math::quaternion<GLfloat>& orientation()const;

	protected:
		void recalc_model_matrix()const;
	};

}

#endif