#pragma once
#ifndef _NB_CAMERA
#define _NB_CAMERA

#include <GLLoad.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_inverse.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

namespace NB {

class Camera {
public:
    typedef glm::vec3 Vec3;
    typedef glm::mat4 Mat4;

    enum CameraType : unsigned char {
        None,
        Orthographic,
        Perspective
    };

    static Vec3 normCross(const Vec3&, const Vec3&);

    Camera(
        const Vec3& pos=Vec3(1.0f, 0.0f, 0.0f),
        const Vec3& tar=Vec3(0.0f, 0.0f, 0.0f),
        const Vec3& up =Vec3(0.0f, 1.0f, 0.0f)
    );

    Vec3 getPos() const;
    Vec3 getTarget() const;
    Vec3 getDirection() const;
    Vec3 getWorldUp() const;
    Vec3 getUp() const;
    Vec3 getRight() const;
    Mat4 getLookMatrix() const;
    Mat4 getProjectionMatrix() const;
    Mat4 getFlattenedMatrices() const;

    void setProjection(const Mat4&);
    void setPos(const Vec3&);
    void setTarget(const Vec3&);
    void setDirection(const Vec3&);
    void setWorldUp(const Vec3&);
    void addPos(const Vec3&);
    void panPos(const Vec3&);
    void panPosRelative(const Vec3&);
    void addTarget(const Vec3&);
    void roll(float);
    void pitch(float);
    void yaw(float);

protected:
    Vec3 _pos;
    Vec3 _tar;
    Vec3 _dir;
    Vec3 _world_up;
    Vec3 _up;
    Vec3 _right;
    Mat4 _look;
    Mat4 _proj;
    const CameraType _camera_type;
    
    void _calcLook();

};

}
#endif // _NB_CAMERA