/***********************************************************************************************************************
 *
 * Copyright (c) 2010 - 2025 by Tech Soft 3D, Inc.
 * The information contained herein is confidential and proprietary to Tech Soft 3D, Inc., and considered a trade secret
 * as defined under civil and criminal statutes. Tech Soft 3D shall pursue its civil and criminal remedies in the event
 * of unauthorized use or misappropriation of its trade secrets. Use of this information by anyone other than authorized
 * employees of Tech Soft 3D, Inc. is granted only under a written non-disclosure agreement, expressly prescribing the
 * scope and manner of such use.
 *
 ***********************************************************************************************************************/

#ifndef CAMERA_H
#define CAMERA_H

#include <glm/vec3.hpp>

#include "../utils/bounding_box.h"

class Camera
{
public:
	enum class EMovement
	{
		ZOOM_IN = 0,
		ZOOM_OUT,
		FRONT_DIRECT,
		FRONT_INV,
		RIGHT_DIRECT,
		RIGHT_INV,
		UP_DIRECT,
		UP_INV,
		MV_RIGHT,
		MV_LEFT,
		MV_UP,
		MV_DOWN
	};//enum to manage the different kind of camera moving

	enum class EView
	{
		ISO = 0,
		TOP,
		BOTTOM,
		LEFT,
		RIGHT,
		FRONT,
		BACK
	};//enum names the computed views

	glm::vec3 position;
	glm::vec3 front;
	glm::vec3 up;
	glm::vec3 right;
	glm::vec3 orbital_center;
	glm::vec3 start_position;
	glm::vec3 start_front;
	glm::vec3 start_right;
	glm::vec3 start_up;

	// camera Attributes
	float max_bbx_length;

	EView current_view;

	~Camera()= default;

	// processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
	void process_keyboard(Camera::EMovement direction);

	// processes input received from a mouse input system. Expects the offset value in both the x and y direction.
	void process_mouse_rotation(float xOffset, float yOffset, int screenWidth, int screenHeight);

	// processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis.
	void process_mouse_scroll(bool is_zoom_in);

	// processes input received from a mouse move event.
	void process_mouse_translation(float xOffset, float yOffset);

	// process input received from a right mouse click.
	void process_switch_view();

	// set the original position of the camera, calculated with the size of the bounding box
	void initialize_position( const utils::geometry::BoundingBox& bbox);

	// processes input received when the O key on the keyboard is pressed.
	void set_to_origin();

	// allows to have the most optimised far after a zoom in or out
	float calculate_far();
	
	// allows to have the most optimised near after a zoom in or out
	float calculate_near();

	// returns the view matrix calculated
	glm::mat4 get_view_matrix();

private:
	
	// allow to move the camera in cercle from orbital center and the current camera position
	void rotate_camera(glm::vec3 axe_rotate, float alpha);
};
#endif // CAMERA_H