#pragma once

#include "plug.h"
#include "origin.h"
#include "rotation.h"
#include "linmtrx.h"

class NotationFile;

struct CameraInstance__StreamedInstance
{
	size_t instanceSize;
	int
		cameraType,
		cameraID;
	Origin
		localOrigin;
	Radian
		clampValues[4];
};

//##########################################################################
//#############################    CameraInstance    #######################
//##########################################################################

class CameraInstance :
	public Plug
{
	friend class CameraInstanceManager;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	local member data
//
	public:

		enum {
			ErrorCameraType,
			DefaultCameraType,
			AlwaysSeesCameraType,
			CameraTypeCount,
		};

		Radian
			clampValues[4];

	protected:
		Origin
			localOrigin;
		LinearMatrix
			cameraToWorld;

		static int
			FindCameraType(const char *camera_data_type);

		void
			GetCameraTypeString(char *camera_type_string);

		Enumeration
			cameraDataType;

		int
			cameraID;

		char
			cameraName[128];

		void
			CalculateCameraRotation(
				YawPitchRoll *result,
				const Point3D &world
			);

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//  public member data access functions
//
	public:
		int
			GetCameraID()
				{Check(this); return cameraID;}

		const char*
			GetCameraName()
				{Check(this); return cameraName;}
		void
			SetCameraName(const char* camera_name)
				{Str_Copy(cameraName, camera_name, sizeof(cameraName));}

		const Enumeration
			GetCameraType()
				{Check(this); return cameraDataType;}

		const Origin&
			GetLocalOrigin()
				{Check(this); return localOrigin;}
		void
			SetLocalOrigin(const Origin &new_origin);
		const Point3D&
			GetPosition()
				{Check(this); return localOrigin.linearPosition;}

		void
			LookAt(
				Origin *result,
				const Point3D &world_point
			);
		void
			AllowLookingAt(const Point3D &world);

		virtual Logical
			CanCameraSee(const Point3D &world_point);

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// 	Test Class Support
//
	public:
		Logical
			TestInstance() const;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Contruction and Destruction Support
//
	public:
		typedef CameraInstance__StreamedInstance StreamedInstance;

		CameraInstance(
			int	camera_ID,
			const Origin &camera_origin,
			Enumeration	camera_type = DefaultCameraType
		);
		CameraInstance(StreamedInstance *model);
		CameraInstance(
			NotationFile *cam_file,
			const char *camera_page_name
		);

		~CameraInstance();

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Tool Support
//
	public:
		void
			WriteNotationPage(NotationFile *camera_stream);
		static Logical
			CreateStreamedInstance(
				StreamedInstance *model,
				NotationFile *cam_file,
				const char *camera_page_name
			);
};

//##########################################################################
//#############################    CameraInstance    #######################
//##########################################################################

class AlwaysSeesCameraInstance :
	public CameraInstance
{
public:
	AlwaysSeesCameraInstance(
		int	camera_ID,
		const Origin &camera_origin,
		Enumeration	camera_type = DefaultCameraType
	);
	AlwaysSeesCameraInstance(StreamedInstance *model);
	AlwaysSeesCameraInstance(
		NotationFile *cam_file,
		const char *camera_page_name
	);

	Logical
		CanCameraSee(const Point3D &world_point);
};