/** 
 * @file llassetstorage.h
 * @brief definition of LLAssetStorage class which allows simple
 * up/downloads of uuid,type asets
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#ifndef LL_LLASSETSTORAGE_H
#define LL_LLASSETSTORAGE_H

#include <string>

#include "lluuid.h"
#include "lltimer.h"
#include "llnamevalue.h"
#include "llhost.h"
#include "stdenums.h" 	// for EDragAndDropType
#include "lltransfermanager.h" // For LLTSCode enum
#include "llassettype.h"
#include "llstring.h"
#include "llextendedstatus.h"

// Forward declarations
class LLMessageSystem;
class LLXferManager;
class LLAssetStorage;
class LLVFS;
class LLSD;

// anything that takes longer than this to download will abort.
// HTTP Uploads also timeout if they take longer than this.
const F32 LL_ASSET_STORAGE_TIMEOUT = 5 * 60.0f;  

class LLAssetInfo
{
protected:
	std::string		mDescription;
	std::string		mName;

public:
	LLUUID			mUuid;
	LLTransactionID	mTransactionID;
	LLUUID			mCreatorID;
	LLAssetType::EType	mType;

	LLAssetInfo( void );
	LLAssetInfo( const LLUUID& object_id, const LLUUID& creator_id,
				 LLAssetType::EType type, const char* name, const char* desc );
	LLAssetInfo( const LLNameValue& nv );
	
	const std::string& getName( void ) const { return mName; }
	const std::string& getDescription( void ) const { return mDescription; } 
	void setName( const std::string& name );
	void setDescription( const std::string& desc );

	// Assets (aka potential inventory items) can be applied to an
	// object in the world. We'll store that as a string name value
	// pair where the name encodes part of asset info, and the value
	// the rest.  LLAssetInfo objects will be responsible for parsing
	// the meaning out froman LLNameValue object. See the inventory
	// design docs for details.
	void setFromNameValue( const LLNameValue& nv );
};


class LLAssetRequest
{
public:
	LLAssetRequest(const LLUUID &uuid, const LLAssetType::EType at);
	virtual ~LLAssetRequest();
	
	LLUUID getUUID() const					{ return mUUID; }
	LLAssetType::EType getType() const		{ return mType; }

	void setUUID(const LLUUID& id) { mUUID = id; }
	void setType(LLAssetType::EType type) { mType = type; }
	void setTimeout (F64 timeout) { mTimeout = timeout; }

protected:
	LLUUID	mUUID;
	LLAssetType::EType mType;

public:
	void	(*mDownCallback)(LLVFS*, const LLUUID&, LLAssetType::EType, void *, S32, LLExtStat);
	void	(*mUpCallback)(const LLUUID&, void *, S32, LLExtStat);
	void	(*mInfoCallback)(LLAssetInfo *, void *, S32);

	void	*mUserData;
	LLHost  mHost;
	BOOL	mIsTemp;
	BOOL	mIsLocal;
	BOOL	mIsUserWaiting;		// We don't want to try forever if a user is waiting for a result.
	F64		mTime;				// Message system time
	F64		mTimeout;			// Amount of time before timing out.
	BOOL    mIsPriority;
	BOOL	mDataSentInFirstPacket;
	BOOL	mDataIsInVFS;
	LLUUID	mRequestingAgentID;	// Only valid for uploads from an agent

	virtual LLSD getTerseDetails() const;
	virtual LLSD getFullDetails() const;
};

template <class T>
struct ll_asset_request_equal : public std::equal_to<T>
{
	bool operator()(const T& x, const T& y) const 
	{ 
		return (	x->getType() == y->getType()
				&&	x->getUUID() == y->getUUID() );
	}
};


class LLInvItemRequest
{
public:
	LLInvItemRequest(const LLUUID &uuid, const LLAssetType::EType at);
	virtual ~LLInvItemRequest();

	LLUUID getUUID() const					{ return mUUID; }
	LLAssetType::EType getType() const		{ return mType; }

	void setUUID(const LLUUID& id) { mUUID = id; }
	void setType(LLAssetType::EType type) { mType = type; }

protected:
	LLUUID	mUUID;
	LLAssetType::EType mType;

public:
	void	(*mDownCallback)(LLVFS*, const LLUUID&, LLAssetType::EType, void *, S32, LLExtStat);

	void	*mUserData;
	LLHost  mHost;
	BOOL	mIsTemp;
	F64		mTime;				// Message system time
	BOOL    mIsPriority;
	BOOL	mDataSentInFirstPacket;
	BOOL	mDataIsInVFS;

};

class LLEstateAssetRequest
{
public:
	LLEstateAssetRequest(const LLUUID &uuid, const LLAssetType::EType at, EstateAssetType et);
	virtual ~LLEstateAssetRequest();

	LLUUID getUUID() const					{ return mUUID; }
	LLAssetType::EType getAType() const		{ return mAType; }

	void setUUID(const LLUUID& id) { mUUID = id; }
	void setType(LLAssetType::EType type) { mAType = type; }

protected:
	LLUUID	mUUID;
	LLAssetType::EType mAType;
	EstateAssetType mEstateAssetType;

public:
	void	(*mDownCallback)(LLVFS*, const LLUUID&, LLAssetType::EType, void *, S32, LLExtStat);

	void	*mUserData;
	LLHost  mHost;
	BOOL	mIsTemp;
	F64		mTime;				// Message system time
	BOOL    mIsPriority;
	BOOL	mDataSentInFirstPacket;
	BOOL	mDataIsInVFS;

};


// Map of known bad assets
typedef std::map<LLUUID,U64,lluuid_less> toxic_asset_map_t;

typedef void (*LLGetAssetCallback)(LLVFS *vfs, const LLUUID &asset_id,
										 LLAssetType::EType asset_type, void *user_data, S32 status, LLExtStat ext_status);

class LLAssetStorage
{
public:
	// VFS member is public because static child methods need it :(
	LLVFS *mVFS;
	typedef void (*LLStoreAssetCallback)(const LLUUID &asset_id, void *user_data, S32 status, LLExtStat ext_status);

	enum ERequestType
	{
		RT_INVALID = -1,
		RT_DOWNLOAD = 0,
		RT_UPLOAD = 1,
		RT_LOCALUPLOAD = 2,
		RT_COUNT = 3
	};

protected:
	BOOL mShutDown;
	LLHost mUpstreamHost;
	
	LLMessageSystem *mMessageSys;
	LLXferManager	*mXferManager;


	typedef std::list<LLAssetRequest*> request_list_t;
	request_list_t mPendingDownloads;
	request_list_t mPendingUploads;
	request_list_t mPendingLocalUploads;
	
	// Map of toxic assets - these caused problems when recently rezzed, so avoid them
	toxic_asset_map_t	mToxicAssetMap;		// Objects in this list are known to cause problems and are not loaded

public:
	LLAssetStorage(LLMessageSystem *msg, LLXferManager *xfer,
				   LLVFS *vfs, const LLHost &upstream_host);

	LLAssetStorage(LLMessageSystem *msg, LLXferManager *xfer,
				   LLVFS *vfs);
	virtual ~LLAssetStorage();

	void setUpstream(const LLHost &upstream_host);

	virtual BOOL hasLocalAsset(const LLUUID &uuid, LLAssetType::EType type);

	// public interface methods
	// note that your callback may get called BEFORE the function returns

	virtual void getAssetData(const LLUUID uuid, LLAssetType::EType atype, LLGetAssetCallback cb, void *user_data, BOOL is_priority = FALSE);

	/*
	 * TransactionID version
	 * Viewer needs the store_local
	 */
	virtual void storeAssetData(
		const LLTransactionID& tid,
		LLAssetType::EType atype,
		LLStoreAssetCallback callback,
		void* user_data,
		bool temp_file = false,
		bool is_priority = false,
		bool store_local = false,
		bool user_waiting= false,
		F64 timeout=LL_ASSET_STORAGE_TIMEOUT);

	/*
	 * AssetID version
	 * Sim needs both store_local and requesting_agent_id.
	 */
	virtual	void storeAssetData(
		const LLUUID& asset_id,
		LLAssetType::EType asset_type,
		LLStoreAssetCallback callback,
		void* user_data,
		bool temp_file = false,
		bool is_priority = false,
		bool store_local = false,
		const LLUUID& requesting_agent_id = LLUUID::null,
		bool user_waiting= false,
		F64 timeout=LL_ASSET_STORAGE_TIMEOUT);

	virtual void checkForTimeouts();

	void getEstateAsset(const LLHost &object_sim, const LLUUID &agent_id, const LLUUID &session_id,
									const LLUUID &asset_id, LLAssetType::EType atype, EstateAssetType etype,
									 LLGetAssetCallback callback, void *user_data, BOOL is_priority);

	void getInvItemAsset(const LLHost &object_sim,
						 const LLUUID &agent_id, const LLUUID &session_id,
						 const LLUUID &owner_id, const LLUUID &task_id, const LLUUID &item_id,
						 const LLUUID &asset_id, LLAssetType::EType atype,
						 LLGetAssetCallback cb, void *user_data, BOOL is_priority = FALSE); // Get a particular inventory item.

	// Check if an asset is in the toxic map.  If it is, the entry is updated
	BOOL		isAssetToxic( const LLUUID& uuid );

	// Clean the toxic asset list, remove old entries
	void		flushOldToxicAssets( BOOL force_it );

	// Add an item to the toxic asset map
	void		markAssetToxic( const LLUUID& uuid );

protected:
	virtual LLSD getPendingDetails(const request_list_t* requests,
	 				LLAssetType::EType asset_type,
	 				const std::string& detail_prefix) const;

	virtual LLSD getPendingRequest(const request_list_t* requests,
							LLAssetType::EType asset_type,
							const LLUUID& asset_id) const;

	virtual bool deletePendingRequest(request_list_t* requests,
							LLAssetType::EType asset_type,
							const LLUUID& asset_id);

public:
	static const LLAssetRequest* findRequest(const request_list_t* requests,
										LLAssetType::EType asset_type,
										const LLUUID& asset_id);
	static LLAssetRequest* findRequest(request_list_t* requests,
										LLAssetType::EType asset_type,
										const LLUUID& asset_id);

	request_list_t* getRequestList(ERequestType rt);
	const request_list_t* getRequestList(ERequestType rt) const;
	static std::string getRequestName(ERequestType rt);

	S32 getNumPendingDownloads() const;
	S32 getNumPendingUploads() const;
	S32 getNumPendingLocalUploads();
	S32 getNumPending(ERequestType rt) const;

	virtual LLSD getPendingDetails(ERequestType rt,
	 				LLAssetType::EType asset_type,
	 				const std::string& detail_prefix) const;

	virtual LLSD getPendingRequest(ERequestType rt,
							LLAssetType::EType asset_type,
							const LLUUID& asset_id) const;

	virtual bool deletePendingRequest(ERequestType rt,
							LLAssetType::EType asset_type,
							const LLUUID& asset_id);


	// download process callbacks
	static void downloadCompleteCallback(
		S32 result,
		const LLUUID& file_id,
		LLAssetType::EType file_type,
		void* user_data, LLExtStat ext_status);
	static void downloadEstateAssetCompleteCallback(
		S32 result,
		const LLUUID& file_id,
		LLAssetType::EType file_type,
		void* user_data, LLExtStat ext_status);
	static void downloadInvItemCompleteCallback(
		S32 result,
		const LLUUID& file_id,
		LLAssetType::EType file_type,
		void* user_data, LLExtStat ext_status);

	// upload process callbacks
	static void uploadCompleteCallback(const LLUUID&, void *user_data, S32 result, LLExtStat ext_status);
	static void processUploadComplete(LLMessageSystem *msg, void **this_handle);

	// debugging
	static const char* getErrorString( S32 status );

	// deprecated file-based methods
	void getAssetData(const LLUUID uuid, LLAssetType::EType type, void (*callback)(const char*, const LLUUID&, void *, S32, LLExtStat), void *user_data, BOOL is_priority = FALSE);

	/*
	 * AssetID version.
	 */
	virtual void storeAssetData(
		const std::string& filename,
		const LLUUID& asset_id,
		LLAssetType::EType type,
		LLStoreAssetCallback callback,
		void* user_data,
		bool temp_file = false,
		bool is_priority = false,
		bool user_waiting = false,
		F64 timeout  = LL_ASSET_STORAGE_TIMEOUT);

	/*
	 * TransactionID version
	 */
	virtual void storeAssetData(
		const std::string& filename,
		const LLTransactionID &transaction_id,
		LLAssetType::EType type,
		LLStoreAssetCallback callback,
		void *user_data,
		bool temp_file = false,
		bool is_priority = false,
		bool user_waiting = false,
		F64 timeout  = LL_ASSET_STORAGE_TIMEOUT);

	static void legacyGetDataCallback(LLVFS *vfs, const LLUUID &uuid, LLAssetType::EType, void *user_data, S32 status, LLExtStat ext_status);
	static void legacyStoreDataCallback(const LLUUID &uuid, void *user_data, S32 status, LLExtStat ext_status);

	// Temp assets are stored on sim nodes, they have agent ID and location data associated with them.
	// This is a no-op for non-http asset systems
	virtual void addTempAssetData(const LLUUID& asset_id, const LLUUID& agent_id, const std::string& host_name);
	virtual BOOL hasTempAssetData(const LLUUID& texture_id) const;
	virtual std::string getTempAssetHostName(const LLUUID& texture_id) const;
	virtual LLUUID getTempAssetAgentID(const LLUUID& texture_id) const;
	virtual void removeTempAssetData(const LLUUID& asset_id);
	virtual void removeTempAssetDataByAgentID(const LLUUID& agent_id);
	// Pass LLUUID::null for all
	virtual void dumpTempAssetData(const LLUUID& avatar_id) const;
	virtual void clearTempAssetData();

	// add extra methods to handle metadata

protected:
	void _cleanupRequests(BOOL all, S32 error);
	void _callUploadCallbacks(const LLUUID &uuid, const LLAssetType::EType asset_type, BOOL success, LLExtStat ext_status);

	virtual void _queueDataRequest(const LLUUID& uuid, LLAssetType::EType type,
								   void (*callback)(LLVFS *vfs, const LLUUID&, LLAssetType::EType, void *, S32, LLExtStat),
								   void *user_data, BOOL duplicate,
								   BOOL is_priority);

private:
	void _init(LLMessageSystem *msg,
			   LLXferManager *xfer,
			   LLVFS *vfs,
			   const LLHost &upstream_host);

protected:
	enum EMetricResult
	{
		// Static valued enums for #dw readability - please copy this
		// declaration to them on updates -- source in llassetstorage.h
		MR_INVALID			= -1,	// Makes no sense
		MR_OKAY				= 0,	// Success - no metric normally
		MR_ZERO_SIZE		= 1,	// Zero size asset
		MR_BAD_FUNCTION		= 2,	// Tried to use a virtual base (PROGRAMMER ERROR)
		MR_FILE_NONEXIST	= 3,	// Old format store call - source file does not exist
		MR_NO_FILENAME		= 4,	// Old format store call - source filename is NULL/0-length
		MR_NO_UPSTREAM		= 5,	// Upstream provider is missing
		MR_VFS_CORRUPTION	= 6		// VFS is corrupt - too-large or mismatched stated/returned sizes
	};

	static class LLMetrics *metric_recipient;

	static void reportMetric( const LLUUID& asset_id, const LLAssetType::EType asset_type, const std::string& filename,
							  const LLUUID& agent_id, S32 asset_size, EMetricResult result,
							  const char* file, const S32 line, const std::string& message ); 
public:
	static void setMetricRecipient( LLMetrics *recip )
	{
		metric_recipient = recip;
	}
};

////////////////////////////////////////////////////////////////////////
// Wrappers to replicate deprecated API
////////////////////////////////////////////////////////////////////////

class LLLegacyAssetRequest
{
public:
	void	(*mDownCallback)(const char *, const LLUUID&, void *, S32, LLExtStat);
	LLAssetStorage::LLStoreAssetCallback mUpCallback;

	void	*mUserData;
};

extern LLAssetStorage *gAssetStorage;
extern const LLUUID CATEGORIZE_LOST_AND_FOUND_ID;
#endif