/* Copyright (C) 2021 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_GAMEVIEW
#define INCLUDED_GAMEVIEW

#include "renderer/Scene.h"
#include "simulation2/system/Entity.h"

#include "lib/input.h" // InReaction - can't forward-declare enum

class CCamera;
class CCinemaManager;
class CGame;
class CObjectManager;
class CVector3D;
struct SViewPort;

class CGameViewImpl;

class CGameView : private Scene
{
	NONCOPYABLE(CGameView);
public:
	CGameView(CGame *pGame);
	~CGameView();

	void SetViewport(const SViewPort& vp);

	void RegisterInit();
	int Initialize();

	/**
	 * Updates all the view information (i.e. rotate camera, scroll, whatever). This will *not* change any
	 * World information - only the *presentation*.
	 *
	 * @param deltaRealTime Elapsed real time since the last frame.
	 */
	void Update(const float deltaRealTime);

	void BeginFrame();
	void Render();

	InReaction HandleEvent(const SDL_Event_* ev);

	CVector3D GetCameraPivot() const;
	CVector3D GetCameraPosition() const;
	CVector3D GetCameraRotation() const;
	float GetCameraZoom() const;

	void SetCamera(const CVector3D& pos, float rotX, float rotY, float zoom);
	void MoveCameraTarget(const CVector3D& target);
	void ResetCameraTarget(const CVector3D& target);
	void FollowEntity(entity_id_t entity, bool firstPerson);
	entity_id_t GetFollowedEntity();

	#define DECLARE_BOOLEAN_SETTING(NAME) \
	bool Get##NAME##Enabled() const; \
	void Set##NAME##Enabled(bool Enabled);

	DECLARE_BOOLEAN_SETTING(Culling);
	DECLARE_BOOLEAN_SETTING(LockCullCamera);
	DECLARE_BOOLEAN_SETTING(ConstrainCamera);

	#undef DECLARE_BOOLEAN_SETTING

	CCamera* GetCamera();
	CCinemaManager* GetCinema();
	CObjectManager& GetObjectManager();

	// Implementations of Scene
	void EnumerateObjects(const CFrustum& frustum, SceneCollector* c) override;
	CLOSTexture& GetLOSTexture() override;
	CTerritoryTexture& GetTerritoryTexture() override;
	CMiniMapTexture& GetMiniMapTexture() override;

private:
	// Unloads all graphics resources loaded by RegisterInit.
	void UnloadResources();

	// Checks whether lighting environment has changed and update vertex data if necessary.
	void CheckLightEnv();

	CGameViewImpl* m;
};

extern InReaction game_view_handler(const SDL_Event_* ev);

#endif // INCLUDED_GAMEVIEW