//-----------------------------------------------------------------------------
// Basic camera class including derived orbit-style and first person
// shooter (FPS) style camera support
//-----------------------------------------------------------------------------
#ifndef CAMERA_H
#define CAMERA_H

#include "glm/glm.hpp"
#include "glm/gtc/constants.hpp"


//--------------------------------------------------------------
// Abstract Camera Class
//--------------------------------------------------------------
class Camera
{
public:
	glm::mat4 getViewMatrix() const;

	virtual void setPosition(const glm::vec3& position) {}
	virtual void rotate(float yaw, float pitch) {}  // in degrees
	virtual void move(const glm::vec3& offsetPos) {}

	const glm::vec3& getLook() const;
	const glm::vec3& getRight() const;
	const glm::vec3& getUp() const;
	const glm::vec3& getPosition() const;

	float getFOV() const   { return mFOV; }
	void setFOV(float fov) { mFOV = fov; }		// in degrees

protected:
	Camera();

	virtual void updateCameraVectors() {}

	glm::vec3 mPosition;
	glm::vec3 mTargetPos;
	glm::vec3 mLook;
	glm::vec3 mUp;
	glm::vec3 mRight;
	const glm::vec3 WORLD_UP;

	// Euler Angles (in radians)
	float mYaw;
	float mPitch;

	// Camera parameters
	float mFOV; // degrees
};

//--------------------------------------------------------------
// FPS Camera Class
//--------------------------------------------------------------
class FPSCamera : public Camera
{
public:

	FPSCamera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f), float yaw = glm::pi<float>(), float pitch = 0.0f); // (yaw) initial angle faces -Z

	virtual void setPosition(const glm::vec3& position);
	virtual void rotate(float yaw, float pitch);	// in degrees
	virtual void move(const glm::vec3& offsetPos);

private:

	void updateCameraVectors();
};


//--------------------------------------------------------------
// Orbit Camera Class
//--------------------------------------------------------------
class OrbitCamera : public Camera
{
public:

	OrbitCamera();

	virtual void rotate(float yaw, float pitch);    // in degrees

	// Camera Controls
	void setLookAt(const glm::vec3& target);
	void setRadius(float radius);

private:

	void updateCameraVectors();

	// Camera parameters
	float mRadius;
};
#endif //CAMERA_H