/**
 * @file llpathfindingmanager.h
 * @author William Todd Stinson
 * @brief A state manager for the various pathfinding states.
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLPATHFINDINGMANAGER_H
#define LL_LLPATHFINDINGMANAGER_H

#include <string>
#include <map>

#include <boost/function.hpp>
#include <boost/signals2.hpp>

#include "llpathfindinglinkset.h"
#include "llpathfindingobjectlist.h"
#include "llpathfindingnavmesh.h"
#include "llsingleton.h"
#include "lluuid.h"
#include "llpanel.h"
#include "llmoveview.h"

class LLViewerRegion;
class LLPathfindingNavMeshStatus;

class LLPathfindingManager : public LLSingleton<LLPathfindingManager>
{
	friend class LLNavMeshSimStateChangeNode;
	friend class NavMeshStatusResponder;
public:
	typedef std::map<LLUUID, LLPathfindingNavMeshPtr> NavMeshMap;

	typedef enum {
		kRequestStarted,
		kRequestCompleted,
		kRequestNotEnabled,
		kRequestError
	} ERequestStatus;

	LLPathfindingManager();
	virtual ~LLPathfindingManager();

	void initSystem();
	void quitSystem();

	bool isPathfindingEnabledForCurrentRegion() const;
	bool isPathfindingEnabledForRegion(LLViewerRegion *pRegion) const;

	bool isPathfindingDebugEnabled() const;

	bool isAllowViewTerrainProperties() const;

	LLPathfindingNavMesh::navmesh_slot_t registerNavMeshListenerForRegion(LLViewerRegion *pRegion, LLPathfindingNavMesh::navmesh_callback_t pNavMeshCallback);
	void requestGetNavMeshForRegion(LLViewerRegion *pRegion, bool pIsGetStatusOnly);

	typedef U32 request_id_t;
	typedef boost::function<void (request_id_t, ERequestStatus, LLPathfindingObjectListPtr)> object_request_callback_t;

	void requestGetLinksets(request_id_t pRequestId, object_request_callback_t pLinksetsCallback) const;
	void requestSetLinksets(request_id_t pRequestId, const LLPathfindingObjectListPtr &pLinksetListPtr, LLPathfindingLinkset::ELinksetUse pLinksetUse, S32 pA, S32 pB, S32 pC, S32 pD, object_request_callback_t pLinksetsCallback) const;

	void requestGetCharacters(request_id_t pRequestId, object_request_callback_t pCharactersCallback) const;

	friend class LLAgentStateChangeNode;
	friend class AgentStateResponder;
	
	typedef boost::function< void () >				agent_state_callback_t;
	typedef boost::signals2::signal< void () >		agent_state_signal_t;
	typedef boost::signals2::connection				agent_state_slot_t;	

	agent_state_slot_t registerAgentStateListener(agent_state_callback_t pAgentStateCallback);

	void handleNavMeshRebakeResult( const LLSD &pContent );
	void handleNavMeshRebakeError( U32 pStatus, const std::string &pReason, const std::string &pURL );
	void triggerNavMeshRebuild();
	void onRegionBoundaryCrossed();
	void requestGetAgentState();

protected:

private:
	void sendRequestGetNavMeshForRegion(LLPathfindingNavMeshPtr navMeshPtr, LLViewerRegion *pRegion, const LLPathfindingNavMeshStatus &pNavMeshStatus);

	void handleDeferredGetNavMeshForRegion(const LLUUID &pRegionUUID, bool pIsGetStatusOnly);
	void handleDeferredGetLinksetsForRegion(const LLUUID &pRegionUUID, request_id_t pRequestId, object_request_callback_t pLinksetsCallback) const;
	void handleDeferredGetCharactersForRegion(const LLUUID &pRegionUUID, request_id_t pRequestId, object_request_callback_t pCharactersCallback) const;

	void handleNavMeshStatusRequest(const LLPathfindingNavMeshStatus &pNavMeshStatus, LLViewerRegion *pRegion, bool pIsGetStatusOnly);
	void handleNavMeshStatusUpdate(const LLPathfindingNavMeshStatus &pNavMeshStatus);

	void handleAgentStateUpdate();

	LLPathfindingNavMeshPtr getNavMeshForRegion(const LLUUID &pRegionUUID);
	LLPathfindingNavMeshPtr getNavMeshForRegion(LLViewerRegion *pRegion);

	std::string getNavMeshStatusURLForRegion(LLViewerRegion *pRegion) const;
	std::string getRetrieveNavMeshURLForRegion(LLViewerRegion *pRegion) const;
	std::string getObjectLinksetsURLForCurrentRegion() const;
	std::string getTerrainLinksetsURLForCurrentRegion() const;
	std::string getCharactersURLForCurrentRegion() const;
	std::string	getAgentStateURLForCurrentRegion(LLViewerRegion *pRegion) const;
	std::string getCapabilityURLForCurrentRegion(const std::string &pCapabilityName) const;
	std::string getCapabilityURLForRegion(LLViewerRegion *pRegion, const std::string &pCapabilityName) const;
	LLViewerRegion *getCurrentRegion() const;

	void handleNavMeshStatus(LLPathfindingNavMesh::ENavMeshRequestStatus pRequestStatus, const LLPathfindingNavMeshStatus &pNavMeshStatus);

	void displayNavMeshRebakePanel();
	void hideNavMeshRebakePanel();	
	void handleAgentStateResult(const LLSD &pContent );
	void handleAgentStateError(U32 pStatus, const std::string &pReason, const std::string &pURL);

	NavMeshMap                           mNavMeshMap;
	agent_state_slot_t                   mCrossingSlot;
	agent_state_signal_t                 mAgentStateSignal;
	LLPathfindingNavMesh::navmesh_slot_t mNavMeshSlot;
};


#endif // LL_LLPATHFINDINGMANAGER_H