#ifndef _GameView_H
#define _GameView_H

// needed by minimap
extern float g_MaxZoomHeight;	//note:  Max terrain height is this minus YMinOffset
extern float g_YMinOffset;

#include "Camera.h"
#include "CinemaTrack.h"
#include "ModelDef.h"
#include "maths/Vector3D.h"
#include "LightEnv.h"
#include "scripting/ScriptableObject.h"

#include "lib/input.h"

class CGame;
class CGameAttributes;
class CWorld;
class CTerrain;
class CUnitManager;
class CProjectileManager;
class CModel;
class CEntity;

class CGameView: public CJSObject<CGameView>
{
public:
	static const float defaultFOV, defaultNear, defaultFar;

private:
	CGame *m_pGame;
	CWorld *m_pWorld;

	/**
	 * m_ViewCamera: this camera controls the eye position when rendering
	 */
	CCamera m_ViewCamera;

	/**
	 * m_CullCamera: this camera controls the frustum that is used for culling
	 * and shadow calculations
	 *
	 * Note that all code that works with camera movements should only change
	 * m_ViewCamera. The render functions automatically sync the cull camera to
	 * the view camera depending on the value of m_LockCullCamera.
	 */
	CCamera m_CullCamera;

	/**
	 * m_LockCullCamera: When @c true, the cull camera is locked in place.
	 * When @c false, the cull camera follows the view camera.
	 *
	 * Exposed to JS as gameView.lockCullCamera
	 */
	bool m_LockCullCamera;

	/**
	 * m_cachedLightEnv: Cache global lighting environment. This is used  to check whether the
	 * environment has changed during the last frame, so that vertex data can be updated etc.
	 */
	CLightEnv m_cachedLightEnv;

	CCinemaManager m_TrackManager;
	CCinemaTrack m_TestTrack;

	////////////////////////////////////////
	// Settings
	float m_ViewScrollSpeed;
	float m_ViewRotateSensitivity;
	float m_ViewRotateSensitivityKeyboard;
	float m_ViewRotateAboutTargetSensitivity;
	float m_ViewRotateAboutTargetSensitivityKeyboard;
	float m_ViewDragSensitivity;
	float m_ViewZoomSensitivityWheel;
	float m_ViewZoomSensitivity;
	float m_ViewZoomSmoothness; // 0.0 = instantaneous zooming, 1.0 = so slow it never moves
	float m_ViewSnapSmoothness; // Just the same.


	////////////////////////////////////////
	// Camera Controls State
	CVector3D m_CameraDelta;
	CVector3D m_CameraPivot;

	CEntity* m_UnitView;
	CModel* m_UnitViewProp;
	CEntity* m_UnitAttach;
	//float m_CameraZoom;
	std::vector<CVector3D> m_CameraTargets;

	// Accumulate zooming changes across frames for smoothness
	float m_ZoomDelta;

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

	// RenderTerrain: iterate through all terrain patches and submit all patches
	// in viewing frustum to the renderer, for terrain, water and LOS painting
	void RenderTerrain(CTerrain *pTerrain);

	// RenderModels: iterate through model list and submit all models in viewing
	// frustum to the Renderer
	void RenderModels(CUnitManager *pUnitMan, CProjectileManager *pProjectileManager);

	// SubmitModelRecursive: recurse down given model, submitting it and all its
	// descendents to the renderer
	void SubmitModelRecursive(CModel *pModel);

	// InitResources(): Load all graphics resources (textures, actor objects and
	// alpha maps) required by the game
	//void InitResources();

	// UnloadResources(): Unload all graphics resources loaded by InitResources
	void UnloadResources();

	// JS Interface
	bool JSI_StartCustomSelection(JSContext *cx, uintN argc, jsval *argv);
	bool JSI_EndCustomSelection(JSContext *cx, uintN argc, jsval *argv);

	static void ScriptingInit();

public:
	CGameView(CGame *pGame);
	~CGameView();

	void RegisterInit(CGameAttributes *pAttribs);
	int Initialize(CGameAttributes *pGameAttributes);

	// Update: Update all the view information (i.e. rotate camera, scroll,
	// whatever). This will *not* change any World information - only the
	// *presentation*
	void Update(float DeltaTime);

	// Render: Render the World
	void Render();

	InReaction HandleEvent(const SDL_Event* ev);

	//Keep the camera in between boundaries/smooth camera scrolling/translating
	//Should call this whenever moving (translating) the camera
	void CameraLock(CVector3D Trans, bool smooth=true);
	void CameraLock(float x, float y, float z, bool smooth=true);

	// RenderNoCull: render absolutely everything to a blank frame to force
	// renderer to load required assets
	void RenderNoCull();

	// Camera Control Functions (used by input handler)
	void ResetCamera();
	void ResetCameraOrientation();
	void RotateAboutTarget();

	void PushCameraTarget( const CVector3D& target );
	void SetCameraTarget( const CVector3D& target );
	void PopCameraTarget();

	//First person camera attachment (through the eyes of the unit)
	void ToUnitView(CEntity* target, CModel* prop);
	//Keep view the same but follow the unit
	void AttachToUnit(CEntity* target) { m_UnitAttach = target; }

	bool IsAttached () { if( m_UnitAttach ) { return true; }  return false; }
	bool IsUnitView () { if( m_UnitView ) { return true; } return false; }

	inline CCamera *GetCamera()
	{	return &m_ViewCamera; }
};
extern InReaction game_view_handler(const SDL_Event* ev);

#endif