/**
 * @file llconversationlog.h
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2012, 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
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llagent.h"
#include "llavatarnamecache.h"
#include "llconversationlog.h"
#include "lldiriterator.h"
#include "llnotificationsutil.h"
#include "lltrans.h"

const S32Days CONVERSATION_LIFETIME = (S32Days)30; // lifetime of LLConversation is 30 days by spec

struct ConversationParams : public LLInitParam::Block<ConversationParams>
{
	Mandatory<U64Seconds >	time;
	Mandatory<std::string>						timestamp;
	Mandatory<SessionType>						conversation_type;
	Mandatory<std::string>						conversation_name,
												history_filename;
	Mandatory<LLUUID>							session_id,
												participant_id;
	Mandatory<bool>								has_offline_ims;
};

/************************************************************************/
/*             LLConversation implementation                            */
/************************************************************************/

LLConversation::LLConversation(const ConversationParams& params)
:	mTime(params.time),
	mConversationType(params.conversation_type),
	mConversationName(params.conversation_name),
	mHistoryFileName(params.history_filename),
	mSessionID(params.session_id),
	mParticipantID(params.participant_id),
	mHasOfflineIMs(params.has_offline_ims),
	mTimestamp(params.timestamp.isProvided() ? params.timestamp : createTimestamp(params.time))
{
	setListenIMFloaterOpened();
}

LLConversation::LLConversation(const LLIMModel::LLIMSession& session)
:	mTime(time_corrected()),
	mConversationType(session.mSessionType),
	mConversationName(session.mName),
	mHistoryFileName(session.mHistoryFileName),
	mSessionID(session.isOutgoingAdHoc() ? session.generateOutgoingAdHocHash() : session.mSessionID),
	mParticipantID(session.mOtherParticipantID),
	mHasOfflineIMs(session.mHasOfflineMessage),
	mTimestamp(createTimestamp(mTime))
{
	setListenIMFloaterOpened();
}

LLConversation::LLConversation(const LLConversation& conversation)
{
	mTime				= conversation.getTime();
	mTimestamp			= conversation.getTimestamp();
	mConversationType	= conversation.getConversationType();
	mConversationName	= conversation.getConversationName();
	mHistoryFileName	= conversation.getHistoryFileName();
	mSessionID			= conversation.getSessionID();
	mParticipantID		= conversation.getParticipantID();
	mHasOfflineIMs		= conversation.hasOfflineMessages();

	setListenIMFloaterOpened();
}

LLConversation::~LLConversation()
{
	mIMFloaterShowedConnection.disconnect();
}

void LLConversation::updateTimestamp()
{
	mTime = (U64Seconds)time_corrected();
	mTimestamp = createTimestamp(mTime);
}

void LLConversation::onIMFloaterShown(const LLUUID& session_id)
{
	if (mSessionID == session_id)
	{
		mHasOfflineIMs = false;
	}
}

// static
const std::string LLConversation::createTimestamp(const U64Seconds& utc_time)
{
	std::string timeStr;
	LLSD substitution;
	substitution["datetime"] = (S32)utc_time.value();

	timeStr = "["+LLTrans::getString ("TimeMonth")+"]/["
				 +LLTrans::getString ("TimeDay")+"]/["
				 +LLTrans::getString ("TimeYear")+"] ["
				 +LLTrans::getString ("TimeHour")+"]:["
				 +LLTrans::getString ("TimeMin")+"]";


	LLStringUtil::format (timeStr, substitution);
	return timeStr;
}

bool LLConversation::isOlderThan(U32Days days) const
{
	U64Seconds now(time_corrected());
	U32Days age = now - mTime;

	return age > days;
}

void LLConversation::setListenIMFloaterOpened()
{
	LLFloaterIMSession* floater = LLFloaterIMSession::findInstance(mSessionID);

	bool offline_ims_visible = LLFloaterIMSession::isVisible(floater) && floater->hasFocus();

	// we don't need to listen for im floater with this conversation is opened
	// if floater is already opened or this conversation doesn't have unread offline messages
	if (mHasOfflineIMs && !offline_ims_visible)
	{
		mIMFloaterShowedConnection = LLFloaterIMSession::setIMFloaterShowedCallback(boost::bind(&LLConversation::onIMFloaterShown, this, _1));
	}
	else
	{
		mHasOfflineIMs = false;
	}
}

/************************************************************************/
/*             LLConversationLogFriendObserver implementation           */
/************************************************************************/

// Note : An LLSingleton like LLConversationLog cannot be an LLFriendObserver 
// at the same time.
// This is because avatar observers are deleted by the observed object which 
// conflicts with the way LLSingleton are deleted.

class LLConversationLogFriendObserver : public LLFriendObserver
{
public:
	LLConversationLogFriendObserver() = default;
	virtual ~LLConversationLogFriendObserver() = default;
	void changed(U32 mask) override;
};

void LLConversationLogFriendObserver::changed(U32 mask)
{
	if (mask & (LLFriendObserver::ADD | LLFriendObserver::REMOVE))
	{
		LLConversationLog::instance().notifyObservers();
	}
}

/************************************************************************/
/*             LLConversationLog implementation                         */
/************************************************************************/

LLConversationLog::LLConversationLog() :
	mFriendObserver(nullptr),
	mAvatarNameCacheConnection(),
	mLoggingEnabled(false)
{
}

void LLConversationLog::enableLogging(S32 log_mode)
{
	mLoggingEnabled = log_mode > 0;
	if (log_mode > 0)
	{
		mConversations.clear();
		loadFromFile(getFileName());
		LLIMMgr::instance().addSessionObserver(this);
		mNewMessageSignalConnection = LLIMModel::instance().addNewMsgCallback(boost::bind(&LLConversationLog::onNewMessageReceived, this, _1));

		mFriendObserver = new LLConversationLogFriendObserver;
		LLAvatarTracker::instance().addObserver(mFriendObserver);
	}
	else
	{
		saveToFile(getFileName());

		LLIMMgr::instance().removeSessionObserver(this);
		mNewMessageSignalConnection.disconnect();
		LLAvatarTracker::instance().removeObserver(mFriendObserver);
	}

	notifyObservers();
}

void LLConversationLog::logConversation(const LLUUID& session_id, BOOL has_offline_msg)
{
	const LLIMModel::LLIMSession* session = LLIMModel::instance().findIMSession(session_id);
	LLConversation* conversation = findConversation(session);

	if (session && session->mOtherParticipantID != gAgentID)
	{
    	if (conversation)
		{
			if(has_offline_msg)
			{
				updateOfflineIMs(session, has_offline_msg);
			}
			updateConversationTimestamp(conversation);
		}
		else
		{
			createConversation(session);
		}
	}
}

void LLConversationLog::createConversation(const LLIMModel::LLIMSession* session)
{
	if (session)
	{
		LLConversation conversation(*session);
		mConversations.push_back(conversation);

		if (LLIMModel::LLIMSession::P2P_SESSION == session->mSessionType)
		{
			if (mAvatarNameCacheConnection.connected())
			{
				mAvatarNameCacheConnection.disconnect();
			}
			mAvatarNameCacheConnection = LLAvatarNameCache::get(session->mOtherParticipantID, boost::bind(&LLConversationLog::onAvatarNameCache, this, _1, _2, session));
		}

		notifyObservers();
	}
}

void LLConversationLog::updateConversationName(const LLIMModel::LLIMSession* session, const std::string& name)
{
	if (!session)
	{
		return;
	}

	LLConversation* conversation = findConversation(session);
	if (conversation)
	{
		conversation->setConversationName(name);
		notifyParticularConversationObservers(conversation->getSessionID(), LLConversationLogObserver::CHANGED_NAME);
	}
}

void LLConversationLog::updateOfflineIMs(const LLIMModel::LLIMSession* session, BOOL new_messages)
{
	if (!session)
	{
		return;
	}

	LLConversation* conversation = findConversation(session);
	if (conversation)
	{
		conversation->setOfflineMessages(new_messages);
		notifyParticularConversationObservers(conversation->getSessionID(), LLConversationLogObserver::CHANGED_OfflineIMs);
	}
}

void LLConversationLog::updateConversationTimestamp(LLConversation* conversation)
{
	if (conversation)
	{
		conversation->updateTimestamp();
		notifyParticularConversationObservers(conversation->getSessionID(), LLConversationLogObserver::CHANGED_TIME);
	}
}

LLConversation* LLConversationLog::findConversation(const LLIMModel::LLIMSession* session)
{
	if (session)
	{
		const LLUUID session_id = session->isOutgoingAdHoc() ? session->generateOutgoingAdHocHash() : session->mSessionID;

		conversations_vec_t::iterator conv_it = mConversations.begin();
		for(; conv_it != mConversations.end(); ++conv_it)
		{
			if (conv_it->getSessionID() == session_id)
			{
				return &*conv_it;
			}
		}
	}

	return nullptr;
}

void LLConversationLog::removeConversation(const LLConversation& conversation)
{
	conversations_vec_t::iterator conv_it = mConversations.begin();
	for(; conv_it != mConversations.end(); ++conv_it)
	{
		if (conv_it->getSessionID() == conversation.getSessionID() && conv_it->getTime() == conversation.getTime())
		{
			mConversations.erase(conv_it);
			notifyObservers();
			cache();
			return;
		}
	}
}

const LLConversation* LLConversationLog::getConversation(const LLUUID& session_id)
{
	conversations_vec_t::const_iterator conv_it = mConversations.begin();
	for(; conv_it != mConversations.end(); ++conv_it)
	{
		if (conv_it->getSessionID() == session_id)
		{
			return &*conv_it;
		}
	}

	return nullptr;
}

void LLConversationLog::addObserver(LLConversationLogObserver* observer)
{
	mObservers.insert(observer);
}

void LLConversationLog::removeObserver(LLConversationLogObserver* observer)
{
	mObservers.erase(observer);
}

void LLConversationLog::sessionAdded(const LLUUID& session_id, const std::string& name, const LLUUID& other_participant_id, BOOL has_offline_msg)
{
	logConversation(session_id, has_offline_msg);
}

void LLConversationLog::cache()
{
	if (gSavedPerAccountSettings.getS32("KeepConversationLogTranscripts") > 0)
	{
		saveToFile(getFileName());
	}
}

void LLConversationLog::getListOfBackupLogs(std::vector<std::string>& list_of_backup_logs)
{
	// get Users log directory
	std::string dirname = gDirUtilp->getPerAccountChatLogsDir();

	// add final OS dependent delimiter
	dirname += gDirUtilp->getDirDelimiter();

	// create search pattern
	std::string pattern = "conversation.log.backup*";

	LLDirIterator iter(dirname, pattern);
	std::string filename;
	while (iter.next(filename))
	{
		list_of_backup_logs.push_back(gDirUtilp->add(dirname, filename));
	}
}

void LLConversationLog::deleteBackupLogs()
{
	std::vector<std::string> backup_logs;
	getListOfBackupLogs(backup_logs);

	for (const std::string& fullpath : backup_logs)
	{
		LLFile::remove(fullpath);
	}
}

bool LLConversationLog::moveLog(const std::string &originDirectory, const std::string &targetDirectory)
{

	std::string backupFileName;
	unsigned backupFileCount = 0;

	//Does the file exist in the current path, if it does lets move it
	if(LLFile::isfile(originDirectory)) 
	{
		//The target directory contains that file already, so lets store it
		if(LLFile::isfile(targetDirectory))
		{
			backupFileName = targetDirectory + ".backup";

			//If needed store backup file as .backup1 etc.
			while(LLFile::isfile(backupFileName))
			{
				++backupFileCount;
				backupFileName = targetDirectory + ".backup" + fmt::to_string(backupFileCount);
			}

			//Rename the file to its backup name so it is not overwritten
			LLFile::rename(targetDirectory, backupFileName);
		}

		//Move the file from the current path to target path
		if(LLFile::rename(originDirectory, targetDirectory) != 0)
		{
			return false;
		}
	}

	return true;
}

void LLConversationLog::initLoggingState()
{
    if (gSavedPerAccountSettings.controlExists("KeepConversationLogTranscripts"))
    {
        LLControlVariable * keep_log_ctrlp = gSavedPerAccountSettings.getControl("KeepConversationLogTranscripts").get();
        S32 log_mode = keep_log_ctrlp->getValue();
        keep_log_ctrlp->getSignal()->connect(boost::bind(&LLConversationLog::enableLogging, this, _2));
        if (log_mode > 0)
        {
            enableLogging(log_mode);
        }
    }
}

std::string LLConversationLog::getFileName()
{
	std::string filename = "conversation";
	std::string log_address = gDirUtilp->getExpandedFilename(LL_PATH_PER_ACCOUNT_CHAT_LOGS, filename);
	if (!log_address.empty())
	{
		log_address += ".log";
	}
	return log_address;
}

bool LLConversationLog::saveToFile(const std::string& filename)
{
	if (filename.empty())
	{
		LL_WARNS() << "Call log list filename is empty!" << LL_ENDL;
		return false;
	}

	LLFILE* fp = LLFile::fopen(filename, "wb");
	if (!fp)
	{
		LL_WARNS() << "Couldn't open call log list" << filename << LL_ENDL;
		return false;
	}

	std::string participant_id;
	std::string conversation_id;

	conversations_vec_t::const_iterator conv_it = mConversations.begin();
	for (; conv_it != mConversations.end(); ++conv_it)
	{
		conv_it->getSessionID().toString(conversation_id);
		conv_it->getParticipantID().toString(participant_id);

		// examples of two file entries
		// [1343221177] 0 1 0 John Doe| 7e4ec5be-783f-49f5-71dz-16c58c64c145 4ec62a74-c246-0d25-2af6-846beac2aa55 john.doe|
		// [1343222639] 2 0 0 Ad-hoc Conference| c3g67c89-c479-4c97-b21d-32869bcfe8rc 68f1c33e-4135-3e3e-a897-8c9b23115c09 Ad-hoc Conference hash597394a0-9982-766d-27b8-c75560213b9a|
		fprintf(fp, "[%lld] %d %d %d %s| %s %s %s|\n",
				(S64)conv_it->getTime().value(),
				(S32)conv_it->getConversationType(),
				(S32)0,
				(S32)conv_it->hasOfflineMessages(),
				LLURI::escape(conv_it->getConversationName()).c_str(),
				participant_id.c_str(),
				conversation_id.c_str(),
				LLURI::escape(conv_it->getHistoryFileName()).c_str());
	}
	fclose(fp);
	return true;
}
bool LLConversationLog::loadFromFile(const std::string& filename)
{
	if(filename.empty())
	{
		LL_WARNS() << "Call log list filename is empty!" << LL_ENDL;
		return false;
	}

	LLFILE* fp = LLFile::fopen(filename, "rb");
	if (!fp)
	{
		LL_WARNS() << "Couldn't open call log list" << filename << LL_ENDL;
		return false;
	}
	bool purge_required = false;

	char buffer[MAX_STRING];
	char conv_name_buffer[MAX_STRING];
	char part_id_buffer[MAX_STRING];
	char conv_id_buffer[MAX_STRING];
	char history_file_name[MAX_STRING];
	S32 has_offline_ims;
	S32 stype;
	S64 time;
	// before CHUI-348 it was a flag of conversation voice state
	int prereserved_unused;

	while (!feof(fp) && fgets(buffer, MAX_STRING, fp))
	{
		conv_name_buffer[0] = '\0';
		part_id_buffer[0]	= '\0';
		conv_id_buffer[0]	= '\0';

		sscanf(buffer, "[%lld] %d %d %d %[^|]| %s %s %[^|]|",
				&time,
				&stype,
				&prereserved_unused,
				&has_offline_ims,
				conv_name_buffer,
				part_id_buffer,
				conv_id_buffer,
				history_file_name);

		ConversationParams params;
		params.time(LLUnits::Seconds::fromValue(time))
			.conversation_type((SessionType)stype)
			.has_offline_ims(has_offline_ims)
			.conversation_name(LLURI::unescape(conv_name_buffer))
			.participant_id(LLUUID(part_id_buffer))
			.session_id(LLUUID(conv_id_buffer))
			.history_filename(LLURI::unescape(history_file_name));

		LLConversation conversation(params);

		// CHUI-325
		// The conversation log should be capped to the last 30 days. Conversations with the last utterance
		// being over 30 days old should be purged from the conversation log text file on login.
		if (conversation.isOlderThan(CONVERSATION_LIFETIME))
		{
			purge_required = true;
			continue;
		}

		mConversations.push_back(conversation);
	}
	fclose(fp);

	if(purge_required)
	{
		LLFile::remove(filename);
		cache();
	}

	notifyObservers();
	return true;
}

void LLConversationLog::notifyObservers()
{
	std::set<LLConversationLogObserver*>::const_iterator iter = mObservers.begin();
	for (; iter != mObservers.end(); ++iter)
	{
		(*iter)->changed();
	}
}

void LLConversationLog::notifyParticularConversationObservers(const LLUUID& session_id, U32 mask)
{
	std::set<LLConversationLogObserver*>::const_iterator iter = mObservers.begin();
	for (; iter != mObservers.end(); ++iter)
	{
		(*iter)->changed(session_id, mask);
	}
}

void LLConversationLog::onNewMessageReceived(const LLSD& data)
{
	const LLUUID session_id = data["session_id"].asUUID();
	logConversation(session_id, false);
}

void LLConversationLog::onAvatarNameCache(const LLUUID& participant_id, const LLAvatarName& av_name, const LLIMModel::LLIMSession* session)
{
	mAvatarNameCacheConnection.disconnect();
	updateConversationName(session, av_name.getCompleteName());
}

void LLConversationLog::onClearLog()
{
	LLNotificationsUtil::add("PreferenceChatClearLog", LLSD(), LLSD(), boost::bind(&LLConversationLog::onClearLogResponse, this, _1, _2));
}

void LLConversationLog::onClearLogResponse(const LLSD& notification, const LLSD& response)
{
	if (0 == LLNotificationsUtil::getSelectedOption(notification, response))
	{
		mConversations.clear();
		notifyObservers();
		cache();
		deleteBackupLogs();
	}
}
