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/*
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 * main-db.cpp
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 * Copyright (C) 2010-2018 Belledonne Communications SARL
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 *
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 * This program 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.
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 *
 * This program 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
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 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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 */

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#include <algorithm>
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#include <ctime>
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#include "linphone/utils/utils.h"

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#include "chat/chat-message/chat-message-p.h"
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#include "chat/chat-room/chat-room-p.h"
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#include "chat/chat-room/client-group-chat-room.h"
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#include "chat/chat-room/server-group-chat-room.h"
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#include "conference/participant-p.h"
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#include "content/content-type.h"
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#include "content/content.h"
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#include "core/core-p.h"
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#include "event-log/event-log-p.h"
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#include "event-log/events.h"
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#include "logger/logger.h"
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#include "main-db-key-p.h"
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#include "main-db-p.h"
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#define DB_MODULE_VERSION_EVENTS L_VERSION(1, 0, 1)
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#define DB_MODULE_VERSION_FRIENDS L_VERSION(1, 0, 0)
#define DB_MODULE_VERSION_LEGACY_FRIENDS_IMPORT L_VERSION(1, 0, 0)
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#define DB_MODULE_VERSION_LEGACY_HISTORY_IMPORT L_VERSION(1, 0, 0)
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// =============================================================================

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// See: http://soci.sourceforge.net/doc/3.2/exchange.html
// Part: Object lifetime and immutability

// -----------------------------------------------------------------------------

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using namespace std;

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LINPHONE_BEGIN_NAMESPACE

// -----------------------------------------------------------------------------

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MainDb::MainDb (const shared_ptr<Core> &core) : AbstractDb(*new MainDbPrivate), CoreAccessor(core) {}
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#ifdef SOCI_ENABLED

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// -----------------------------------------------------------------------------
// Errors handling.
// -----------------------------------------------------------------------------

#define L_SAFE_TRANSACTION_C(CONTEXT) \
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	LinphonePrivate::SafeTransactionInfo().set(__func__, CONTEXT) * [&]()
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#define L_SAFE_TRANSACTION L_SAFE_TRANSACTION_C(this)

struct SafeTransactionInfo {
	SafeTransactionInfo &set (const char *_name, const MainDb *_mainDb) {
		name = _name;
		mainDb = const_cast<MainDb *>(_mainDb);
		return *this;
	}

	const char *name = nullptr;
	MainDb *mainDb = nullptr;
};

template<typename Function>
class SafeTransaction {
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	using InternalReturnType = typename remove_reference<decltype(declval<Function>()())>::type;

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public:
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	using ReturnType = typename std::conditional<
		std::is_same<InternalReturnType, void>::value,
		bool,
		InternalReturnType
	>::type;
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	SafeTransaction (SafeTransactionInfo &info, Function function) : mFunction(move(function)) {
		try {
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			mResult= exec<InternalReturnType>();
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		} catch (const soci::soci_error &e) {
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			lWarning() << "Catched exception in MainDb::" << info.name << "(" << e.what() << ").";
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			soci::soci_error::error_category category = e.get_error_category();
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			if (
				(category == soci::soci_error::connection_error || category == soci::soci_error::unknown) &&
				info.mainDb->forceReconnect()
			) {
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				try {
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					mResult = exec<InternalReturnType>();
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				} catch (const exception &e) {
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					lError() << "Unable to execute query after reconnect in MainDb::" << info.name << "(" << e.what() << ").";
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				}
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				return;
			}
			lError() << "Unhandled [" << getErrorCategoryAsString(category) << "] exception in MainDb::" <<
				info.name << ": `" << e.what() << "`.";
		} catch (const exception &e) {
			lError() << "Unhandled generic exception in MainDb::" << info.name << ": `" << e.what() << "`.";
		}
	}

	SafeTransaction (SafeTransaction &&safeTransaction) : mFunction(move(safeTransaction.mFunction)) {}

	operator ReturnType () const {
		return mResult;
	}

private:
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	// Exec function with no return type.
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	template<typename T>
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	typename std::enable_if<std::is_same<T, void>::value, bool>::type exec () const {
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		mFunction();
		return true;
	}

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	// Exec function with return type.
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	template<typename T>
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	typename std::enable_if<!std::is_same<T, void>::value, T>::type exec () const {
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		return mFunction();
	}

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	static const char *getErrorCategoryAsString (soci::soci_error::error_category category) {
		switch (category) {
			case soci::soci_error::connection_error:
				return "CONNECTION ERROR";
			case soci::soci_error::invalid_statement:
				return "INVALID STATEMENT";
			case soci::soci_error::no_privilege:
				return "NO PRIVILEGE";
			case soci::soci_error::no_data:
				return "NO DATA";
			case soci::soci_error::constraint_violation:
				return "CONSTRAINT VIOLATION";
			case soci::soci_error::unknown_transaction_state:
				return "UNKNOWN TRANSACTION STATE";
			case soci::soci_error::system_error:
				return "SYSTEM ERROR";
			case soci::soci_error::unknown:
				return "UNKNOWN";
		}

		// Unreachable.
		L_ASSERT(false);
		return nullptr;
	}

	Function mFunction;
	ReturnType mResult{};

	L_DISABLE_COPY(SafeTransaction);
};

template<typename Function>
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typename SafeTransaction<Function>::ReturnType operator* (SafeTransactionInfo &info, Function &&function) {
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	return SafeTransaction<Function>(info, forward<Function>(function));
}

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// -----------------------------------------------------------------------------
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// Soci backend.
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// -----------------------------------------------------------------------------

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template<typename T>
struct EnumToSql {
	T first;
	const char *second;
};

template<typename T>
static constexpr const char *mapEnumToSql (const EnumToSql<T> enumToSql[], size_t n, T key) {
	return n == 0 ? "" : (
		enumToSql[n - 1].first == key ? enumToSql[n - 1].second : mapEnumToSql(enumToSql, n - 1, key)
	);
}
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static constexpr EnumToSql<MainDb::Filter> eventFilterToSql[] = {
	{ MainDb::ConferenceCallFilter, "3, 4" },
	{ MainDb::ConferenceChatMessageFilter, "5" },
	{ MainDb::ConferenceInfoFilter, "1, 2, 6, 7, 8, 9, 10, 11, 12" }
};
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static constexpr const char *mapEventFilterToSql (MainDb::Filter filter) {
	return mapEnumToSql(
		eventFilterToSql, sizeof eventFilterToSql / sizeof eventFilterToSql[0], filter
	);
}
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// -----------------------------------------------------------------------------

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static string buildSqlEventFilter (
	const list<MainDb::Filter> &filters,
	MainDb::FilterMask mask,
	const string &condKeyWord = "WHERE"
) {
	L_ASSERT(
		find_if(filters.cbegin(), filters.cend(), [](const MainDb::Filter &filter) {
			return filter == MainDb::NoFilter;
		}) == filters.cend()
	);

	if (mask == MainDb::NoFilter)
		return "";

	bool isStart = true;
	string sql;
	for (const auto &filter : filters) {
		if (!mask.isSet(filter))
			continue;

		if (isStart) {
			isStart = false;
			sql += " " + condKeyWord + " type IN (";
		} else
			sql += ", ";
		sql += mapEventFilterToSql(filter);
	}

	if (!isStart)
		sql += ") ";

	return sql;
}
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// -----------------------------------------------------------------------------

static inline vector<char> blobToVector (soci::blob &in) {
	size_t len = in.get_len();
	if (!len)
		return vector<char>();
	vector<char> out(len);
	in.read(0, &out[0], len);
	return out;
}

static inline string blobToString (soci::blob &in) {
	vector<char> out = blobToVector(in);
	return string(out.begin(), out.end());
}

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static constexpr string &blobToString (string &in) {
	return in;
}

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// -----------------------------------------------------------------------------

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long long MainDbPrivate::resolveId (const soci::row &row, int col) const {
	L_Q();
	// See: http://soci.sourceforge.net/doc/master/backends/
	// `row id` is not supported by soci on Sqlite3. It's necessary to cast id to int...
	return q->getBackend() == AbstractDb::Sqlite3
		? static_cast<long long>(row.get<int>(0))
		: static_cast<long long>(row.get<unsigned long long>(0));
}
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// -----------------------------------------------------------------------------

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long long MainDbPrivate::insertSipAddress (const string &sipAddress) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectSipAddressId(sipAddress);
	if (id >= 0)
		return id;
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	lInfo() << "Insert new sip address in database: `" << sipAddress << "`.";
	*session << "INSERT INTO sip_address (value) VALUES (:sipAddress)", soci::use(sipAddress);
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	return dbSession.getLastInsertId();
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}
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void MainDbPrivate::insertContent (long long eventId, const Content &content) {
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	soci::session *session = dbSession.getBackendSession();
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	const long long &contentTypeId = insertContentType(content.getContentType().asString());
	const string &body = content.getBodyAsString();
	*session << "INSERT INTO chat_message_content (event_id, content_type_id, body) VALUES"
		" (:eventId, :contentTypeId, :body)", soci::use(eventId), soci::use(contentTypeId),
		soci::use(body);

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	const long long &chatMessageContentId = dbSession.getLastInsertId();
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	if (content.isFile()) {
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		const FileContent &fileContent = static_cast<const FileContent &>(content);
		const string &name = fileContent.getFileName();
		const size_t &size = fileContent.getFileSize();
		const string &path = fileContent.getFilePath();
		*session << "INSERT INTO chat_message_file_content (chat_message_content_id, name, size, path) VALUES "
			" (:chatMessageContentId, :name, :size, :path)",
			soci::use(chatMessageContentId), soci::use(name), soci::use(size), soci::use(path);
	}

	for (const auto &appData : content.getAppDataMap())
		*session << "INSERT INTO chat_message_content_app_data (chat_message_content_id, name, data) VALUES"
			" (:chatMessageContentId, :name, :data)",
			soci::use(chatMessageContentId), soci::use(appData.first), soci::use(appData.second);
}
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long long MainDbPrivate::insertContentType (const string &contentType) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id;
	*session << "SELECT id FROM content_type WHERE value = :contentType", soci::use(contentType), soci::into(id);
	if (session->got_data())
		return id;
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	lInfo() << "Insert new content type in database: `" << contentType << "`.";
	*session << "INSERT INTO content_type (value) VALUES (:contentType)", soci::use(contentType);
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	return dbSession.getLastInsertId();
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}

long long MainDbPrivate::insertOrUpdateImportedBasicChatRoom (
	long long peerSipAddressId,
	long long localSipAddressId,
	const tm &creationTime
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectChatRoomId(peerSipAddressId, localSipAddressId);
	if (id >= 0) {
		*session << "UPDATE chat_room SET last_update_time = :lastUpdateTime WHERE id = :id",
			soci::use(creationTime), soci::use(id);
		return id;
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	}

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	static const int capabilities = ChatRoom::CapabilitiesMask(
		{ ChatRoom::Capabilities::Basic, ChatRoom::Capabilities::Migratable }
	);
	lInfo() << "Insert new chat room in database: (peer=" << peerSipAddressId <<
		", local=" << localSipAddressId << ", capabilities=" << capabilities << ").";
	*session << "INSERT INTO chat_room ("
		"  peer_sip_address_id, local_sip_address_id, creation_time, last_update_time, capabilities"
		") VALUES (:peerSipAddressId, :localSipAddressId, :creationTime, :lastUpdateTime, :capabilities)",
		soci::use(peerSipAddressId), soci::use(localSipAddressId), soci::use(creationTime), soci::use(creationTime),
		soci::use(capabilities);
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	return dbSession.getLastInsertId();
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}
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long long MainDbPrivate::insertChatRoom (const shared_ptr<AbstractChatRoom> &chatRoom) {
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	soci::session *session = dbSession.getBackendSession();
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	const ChatRoomId &chatRoomId = chatRoom->getChatRoomId();
	const long long &peerSipAddressId = insertSipAddress(chatRoomId.getPeerAddress().asString());
	const long long &localSipAddressId = insertSipAddress(chatRoomId.getLocalAddress().asString());
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	long long id = selectChatRoomId(peerSipAddressId, localSipAddressId);
	if (id >= 0) {
		lError() << "Unable to insert chat room (it already exists): (peer=" << peerSipAddressId <<
			", local=" << localSipAddressId << ").";
		return id;
	}
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	lInfo() << "Insert new chat room in database: (peer=" << peerSipAddressId <<
		", local=" << localSipAddressId << ").";
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	const tm &creationTime = Utils::getTimeTAsTm(chatRoom->getCreationTime());
	// Remove capabilities like `Proxy`.
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	const int &capabilities = chatRoom->getCapabilities() & ~ChatRoom::CapabilitiesMask(ChatRoom::Capabilities::Proxy);
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	const string &subject = chatRoom->getSubject();
	const int &flags = chatRoom->hasBeenLeft();
	*session << "INSERT INTO chat_room ("
		"  peer_sip_address_id, local_sip_address_id, creation_time, last_update_time, capabilities, subject, flags"
		") VALUES (:peerSipAddressId, :localSipAddressId, :creationTime, :lastUpdateTime, :capabilities, :subject, :flags)",
		soci::use(peerSipAddressId), soci::use(localSipAddressId), soci::use(creationTime), soci::use(creationTime),
		soci::use(capabilities), soci::use(subject), soci::use(flags);
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	id = dbSession.getLastInsertId();
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	if (!chatRoom->canHandleParticipants())
		return id;
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	// Do not add 'me' when creating a server-group-chat-room.
	if (chatRoomId.getLocalAddress() != chatRoomId.getPeerAddress()) {
		shared_ptr<Participant> me = chatRoom->getMe();
		long long meId = insertChatRoomParticipant(
			id,
			insertSipAddress(me->getAddress().asString()),
			me->isAdmin()
		);
		for (const auto &device : me->getPrivate()->getDevices())
			insertChatRoomParticipantDevice(meId, insertSipAddress(device->getAddress().asString()));
	}
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	for (const auto &participant : chatRoom->getParticipants()) {
		long long participantId = insertChatRoomParticipant(
			id,
			insertSipAddress(participant->getAddress().asString()),
			participant->isAdmin()
		);
		for (const auto &device : participant->getPrivate()->getDevices())
			insertChatRoomParticipantDevice(participantId, insertSipAddress(device->getAddress().asString()));
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	}

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	return id;
}
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long long MainDbPrivate::insertChatRoomParticipant (
	long long chatRoomId,
	long long participantSipAddressId,
	bool isAdmin
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long id = selectChatRoomParticipantId(chatRoomId, participantSipAddressId);
	if (id >= 0) {
		// See: https://stackoverflow.com/a/15299655 (cast to reference)
		*session << "UPDATE chat_room_participant SET is_admin = :isAdmin WHERE id = :id",
			soci::use(static_cast<const int &>(isAdmin)), soci::use(id);
		return id;
	}
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	lInfo() << "Insert new chat room participant in database: `" << participantSipAddressId <<
		"` (isAdmin=" << isAdmin << ").";
	*session << "INSERT INTO chat_room_participant (chat_room_id, participant_sip_address_id, is_admin)"
		" VALUES (:chatRoomId, :participantSipAddressId, :isAdmin)",
		soci::use(chatRoomId), soci::use(participantSipAddressId), soci::use(static_cast<const int &>(isAdmin));
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	return dbSession.getLastInsertId();
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}
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void MainDbPrivate::insertChatRoomParticipantDevice (
	long long participantId,
	long long participantDeviceSipAddressId
) {
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	soci::session *session = dbSession.getBackendSession();
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	long long count;
	*session << "SELECT COUNT(*) FROM chat_room_participant_device"
		" WHERE chat_room_participant_id = :participantId"
		" AND participant_device_sip_address_id = :participantDeviceSipAddressId",
		soci::into(count), soci::use(participantId), soci::use(participantDeviceSipAddressId);
	if (count)
		return;

	lInfo() << "Insert new chat room participant device in database: `" << participantDeviceSipAddressId << "`.";
	*session << "INSERT INTO chat_room_participant_device (chat_room_participant_id, participant_device_sip_address_id)"
		" VALUES (:participantId, :participantDeviceSipAddressId)",
		soci::use(participantId), soci::use(participantDeviceSipAddressId);
}
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void MainDbPrivate::insertChatMessageParticipant (long long eventId, long long sipAddressId, int state) {
	// TODO: Deal with read messages.
	// Remove if displayed? Think a good alorithm for mark as read.
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	soci::session *session = dbSession.getBackendSession();
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	soci::statement statement = (
		session->prepare << "UPDATE chat_message_participant SET state = :state"
			" WHERE event_id = :eventId AND participant_sip_address_id = :sipAddressId",
			soci::use(state), soci::use(eventId), soci::use(sipAddressId)
	);
	statement.execute();
	if (statement.get_affected_rows() == 0 && state != static_cast<int>(ChatMessage::State::Displayed))
		*session << "INSERT INTO chat_message_participant (event_id, participant_sip_address_id, state)"
			" VALUES (:eventId, :sipAddressId, :state)",
			soci::use(eventId), soci::use(sipAddressId), soci::use(state);
}
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// -----------------------------------------------------------------------------

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long long MainDbPrivate::selectSipAddressId (const string &sipAddress) const {
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	soci::session *session = dbSession.getBackendSession();
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	long long id;
	*session << "SELECT id FROM sip_address WHERE value = :sipAddress", soci::use(sipAddress), soci::into(id);
	return session->got_data() ? id : -1;
}
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long long MainDbPrivate::selectChatRoomId (long long peerSipAddressId, long long localSipAddressId) const {
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	soci::session *session = dbSession.getBackendSession();
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	long long id;
	*session << "SELECT id FROM chat_room"
		"  WHERE peer_sip_address_id = :peerSipAddressId AND local_sip_address_id = :localSipAddressId",
		soci::use(peerSipAddressId), soci::use(localSipAddressId), soci::into(id);
	return session->got_data() ? id : -1;
}
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long long MainDbPrivate::selectChatRoomId (const ChatRoomId &chatRoomId) const {
	long long peerSipAddressId = selectSipAddressId(chatRoomId.getPeerAddress().asString());
	if (peerSipAddressId < 0)
		return -1;
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	long long localSipAddressId = selectSipAddressId(chatRoomId.getLocalAddress().asString());
	if (localSipAddressId < 0)
		return -1;
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	return selectChatRoomId(peerSipAddressId, localSipAddressId);
}
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long long MainDbPrivate::selectChatRoomParticipantId (long long chatRoomId, long long participantSipAddressId) const {
	long long id;
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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT id from chat_room_participant"
		" WHERE chat_room_id = :chatRoomId AND participant_sip_address_id = :participantSipAddressId",
		soci::into(id), soci::use(chatRoomId), soci::use(participantSipAddressId);
	return session->got_data() ? id : -1;
}
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long long MainDbPrivate::selectOneToOneChatRoomId (long long sipAddressIdA, long long sipAddressIdB) const {
	long long id;
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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT chat_room_id"
		"  FROM one_to_one_chat_room"
		"  WHERE participant_a_sip_address_id IN (:sipAddressIdA, :sipAddressIdB)"
		"  AND participant_b_sip_address_id IN (:sipAddressIdABis, :sipAddressIdBBis)",
		soci::into(id),
		soci::use(sipAddressIdA), soci::use(sipAddressIdB), soci::use(sipAddressIdA), soci::use(sipAddressIdB);
	return session->got_data() ? id : -1;
}

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// -----------------------------------------------------------------------------

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void MainDbPrivate::deleteContents (long long messageEventId) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_message_content WHERE event_id = :messageEventId", soci::use(messageEventId);
}
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void MainDbPrivate::deleteChatRoomParticipant (long long chatRoomId, long long participantSipAddressId) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_room_participant"
		"  WHERE chat_room_id = :chatRoomId AND participant_sip_address_id = :participantSipAddressId",
		soci::use(chatRoomId), soci::use(participantSipAddressId);
}
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void MainDbPrivate::deleteChatRoomParticipantDevice (
	long long participantId,
	long long participantDeviceSipAddressId
) {
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	soci::session *session = dbSession.getBackendSession();
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	*session << "DELETE FROM chat_room_participant_device"
		"  WHERE chat_room_participant_id = :participantId"
		"  AND participant_device_sip_address_id = :participantDeviceSipAddressId",
		soci::use(participantId), soci::use(participantDeviceSipAddressId);
}
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// -----------------------------------------------------------------------------

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shared_ptr<EventLog> MainDbPrivate::selectGenericConferenceEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	shared_ptr<EventLog> eventLog;

	switch (type) {
		case EventLog::Type::None:
			return nullptr;
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		case EventLog::Type::ConferenceCreated:
		case EventLog::Type::ConferenceTerminated:
			eventLog = selectConferenceEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceCallStart:
		case EventLog::Type::ConferenceCallEnd:
			eventLog = selectConferenceCallEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceChatMessage:
			eventLog = selectConferenceChatMessageEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceParticipantAdded:
		case EventLog::Type::ConferenceParticipantRemoved:
		case EventLog::Type::ConferenceParticipantSetAdmin:
		case EventLog::Type::ConferenceParticipantUnsetAdmin:
			eventLog = selectConferenceParticipantEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceParticipantDeviceAdded:
		case EventLog::Type::ConferenceParticipantDeviceRemoved:
			eventLog = selectConferenceParticipantDeviceEvent(eventId, type, creationTime, chatRoomId);
			break;
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		case EventLog::Type::ConferenceSubjectChanged:
			eventLog = selectConferenceSubjectEvent(eventId, type, creationTime, chatRoomId);
			break;
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	}

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	if (eventLog)
		cache(eventLog, eventId);
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	return eventLog;
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceEvent (
	long long,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	return make_shared<ConferenceEvent>(
		type,
		creationTime,
		chatRoomId
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceCallEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	// TODO.
	return nullptr;
}
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template<typename T>
static void fetchContentAppData (soci::session *session, Content &content, long long contentId, T &data) {
	static const string query = "SELECT name, data FROM chat_message_content_app_data"
		" WHERE chat_message_content_id = :contentId";
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	string name;
	soci::statement statement = (session->prepare << query, soci::use(contentId), soci::into(name), soci::into(data));
	statement.execute();
	while (statement.fetch())
		content.setAppData(name, blobToString(data));
}

shared_ptr<EventLog> MainDbPrivate::selectConferenceChatMessageEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	L_Q();

	shared_ptr<Core> core = q->getCore();
	shared_ptr<AbstractChatRoom> chatRoom = core->findChatRoom(chatRoomId);
	if (!chatRoom) {
		lError() << "Unable to find chat room storage id of (peer=" +
			chatRoomId.getPeerAddress().asString() +
			", local=" + chatRoomId.getLocalAddress().asString() + "`).";
		return nullptr;
	}
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	bool hasFileTransferContent = false;
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	// 1 - Fetch chat message.
	shared_ptr<ChatMessage> chatMessage = getChatMessageFromCache(eventId);
	if (chatMessage)
		goto end;
	{
		string fromSipAddress;
		string toSipAddress;
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		tm messageTime;

		string imdnMessageId;
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		int state;
		int direction;
		int isSecured;
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		soci::session *session = dbSession.getBackendSession();
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		*session << "SELECT from_sip_address.value, to_sip_address.value, time, imdn_message_id, state, direction, is_secured"
			" FROM event, conference_chat_message_event, sip_address AS from_sip_address, sip_address AS to_sip_address"
			" WHERE event_id = :eventId"
			" AND event_id = event.id"
			" AND from_sip_address_id = from_sip_address.id"
			" AND to_sip_address_id = to_sip_address.id", soci::into(fromSipAddress), soci::into(toSipAddress),
			soci::into(messageTime), soci::into(imdnMessageId), soci::into(state), soci::into(direction),
			soci::into(isSecured), soci::use(eventId);

		chatMessage = shared_ptr<ChatMessage>(new ChatMessage(
			chatRoom,
			static_cast<ChatMessage::Direction>(direction)
		));
		chatMessage->setIsSecured(static_cast<bool>(isSecured));
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		ChatMessagePrivate *dChatMessage = chatMessage->getPrivate();
		dChatMessage->setState(static_cast<ChatMessage::State>(state), true);
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		dChatMessage->forceFromAddress(IdentityAddress(fromSipAddress));
		dChatMessage->forceToAddress(IdentityAddress(toSipAddress));
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		dChatMessage->setTime(Utils::getTmAsTimeT(messageTime));
		dChatMessage->setImdnMessageId(imdnMessageId);
	}
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	// 2 - Fetch contents.
	{
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		soci::session *session = dbSession.getBackendSession();
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		static const string query = "SELECT chat_message_content.id, content_type.id, content_type.value, body"
			" FROM chat_message_content, content_type"
			" WHERE event_id = :eventId AND content_type_id = content_type.id";
		soci::rowset<soci::row> rows = (session->prepare << query, soci::use(eventId));
		for (const auto &row : rows) {
			ContentType contentType(row.get<string>(2));
			const long long &contentId = resolveId(row, 0);
			Content *content;

			if (contentType == ContentType::FileTransfer) {
				hasFileTransferContent = true;
				content = new FileTransferContent();
			}
			else if (contentType.isFile()) {
				// 2.1 - Fetch contents' file informations.
				string name;
				int size;
				string path;

				*session << "SELECT name, size, path FROM chat_message_file_content"
					" WHERE chat_message_content_id = :contentId",
					soci::into(name), soci::into(size), soci::into(path), soci::use(contentId);

				FileContent *fileContent = new FileContent();
				fileContent->setFileName(name);
				fileContent->setFileSize(static_cast<size_t>(size));
				fileContent->setFilePath(path);

				content = fileContent;
			} else
				content = new Content();

			content->setContentType(contentType);
			content->setBody(row.get<string>(3));

			// 2.2 - Fetch contents' app data.
			if (q->getBackend() == MainDb::Backend::Sqlite3) {
				soci::blob data(*session);
				fetchContentAppData(session, *content, contentId, data);
			} else {
				string data;
				fetchContentAppData(session, *content, contentId, data);
			}
			chatMessage->addContent(*content);
		}
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	}

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	// 3 - Load external body url from body into FileTransferContent if needed.
	if (hasFileTransferContent)
		chatMessage->getPrivate()->loadFileTransferUrlFromBodyToContent();
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	cache(chatMessage, eventId);
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end:
	return make_shared<ConferenceChatMessageEvent>(
		creationTime,
		chatMessage
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string participantAddress;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, participant_address.value"
		"  FROM conference_notified_event, conference_participant_event, sip_address as participant_address"
		"  WHERE conference_participant_event.event_id = :eventId"
		"    AND conference_notified_event.event_id = conference_participant_event.event_id"
		"    AND participant_address.id = participant_sip_address_id",
		soci::into(notifyId), soci::into(participantAddress), soci::use(eventId);

	return make_shared<ConferenceParticipantEvent>(
		type,
		creationTime,
		chatRoomId,
		notifyId,
		IdentityAddress(participantAddress)
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantDeviceEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string participantAddress;
	string deviceAddress;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, participant_address.value, device_address.value"
		"  FROM conference_notified_event, conference_participant_event, conference_participant_device_event,"
		"    sip_address AS participant_address, sip_address AS device_address"
		"  WHERE conference_participant_device_event.event_id = :eventId"
		"    AND conference_participant_event.event_id = conference_participant_device_event.event_id"
		"    AND conference_notified_event.event_id = conference_participant_event.event_id"
		"    AND participant_address.id = participant_sip_address_id"
		"    AND device_address.id = device_sip_address_id",
		soci::into(notifyId), soci::into(participantAddress), soci::into(deviceAddress), soci::use(eventId);

	return make_shared<ConferenceParticipantDeviceEvent>(
		type,
		creationTime,
		chatRoomId,
		notifyId,
		IdentityAddress(participantAddress),
		IdentityAddress(deviceAddress)
	);
}
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shared_ptr<EventLog> MainDbPrivate::selectConferenceSubjectEvent (
	long long eventId,
	EventLog::Type type,
	time_t creationTime,
	const ChatRoomId &chatRoomId
) const {
	unsigned int notifyId;
	string subject;

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	soci::session *session = dbSession.getBackendSession();
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	*session << "SELECT notify_id, subject"
		" FROM conference_notified_event, conference_subject_event"
		" WHERE conference_subject_event.event_id = :eventId"
		" AND conference_notified_event.event_id = conference_subject_event.event_id",
		soci::into(notifyId), soci::into(subject), soci::use(eventId);

	return make_shared<ConferenceSubjectEvent>(
		creationTime,
		chatRoomId,
		notifyId,
		subject
	);
}
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// -----------------------------------------------------------------------------
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long long MainDbPrivate::insertEvent (const shared_ptr<EventLog> &eventLog) {
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	soci::session *session = dbSession.getBackendSession();
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	const int &type = static_cast<int>(eventLog->getType());
	const tm &creationTime = Utils::getTimeTAsTm(eventLog->getCreationTime());
	*session << "INSERT INTO event (type, creation_time) VALUES (:type, :creationTime)",
		soci::use(type),
		soci::use(creationTime);

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	return dbSession.getLastInsertId();
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}
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long long MainDbPrivate::insertConferenceEvent (const shared_ptr<EventLog> &eventLog, long long *chatRoomId) {
	shared_ptr<ConferenceEvent> conferenceEvent = static_pointer_cast<ConferenceEvent>(eventLog);

	long long eventId = -1;
	const long long &curChatRoomId = selectChatRoomId(conferenceEvent->getChatRoomId());
	if (curChatRoomId < 0) {
		// A conference event can be inserted in database only if chat room exists.
		// Otherwise it's an error.
		const ChatRoomId &chatRoomId = conferenceEvent->getChatRoomId();
		lError() << "Unable to find chat room storage id of (peer=" +
			chatRoomId.getPeerAddress().asString() +
			", local=" + chatRoomId.getLocalAddress().asString() + "`).";
	} else {
		eventId = insertEvent(eventLog);
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		soci::session *session = dbSession.getBackendSession();
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		*session << "INSERT INTO conference_event (event_id, chat_room_id)"
			" VALUES (:eventId, :chatRoomId)", soci::use(eventId), soci::use(curChatRoomId);

		const tm &lastUpdateTime = Utils::getTimeTAsTm(eventLog->getCreationTime());
		*session << "UPDATE chat_room SET last_update_time = :lastUpdateTime"
			" WHERE id = :chatRoomId", soci::use(lastUpdateTime),
			soci::use(curChatRoomId);
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		if (eventLog->getType() == EventLog::Type::ConferenceTerminated)
			*session << "UPDATE chat_room SET flags = 1 WHERE id = :chatRoomId", soci::use(curChatRoomId);
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	}

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	if (chatRoomId)
		*chatRoomId = curChatRoomId;

	return eventId;
}
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long long MainDbPrivate::insertConferenceCallEvent (const shared_ptr<EventLog> &eventLog) {
	// TODO.
	return 0;
}
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long long MainDbPrivate::insertConferenceChatMessageEvent (const shared_ptr<EventLog> &eventLog) {
	shared_ptr<ChatMessage> chatMessage = static_pointer_cast<ConferenceChatMessageEvent>(eventLog)->getChatMessage();
	shared_ptr<AbstractChatRoom> chatRoom = chatMessage->getChatRoom();
	if (!chatRoom) {
		lError() << "Unable to get a valid chat room. It was removed from database.";
		return -1;
	}

	const long long &eventId = insertConferenceEvent(eventLog);
	if (eventId < 0)
		return -1;

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	soci::session *session = dbSession.getBackendSession();
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	const long long &fromSipAddressId = insertSipAddress(chatMessage->getFromAddress().asString());
	const long long &toSipAddressId = insertSipAddress(chatMessage->getToAddress().asString());
	const tm &messageTime = Utils::getTimeTAsTm(chatMessage->getTime());
	const int &state = static_cast<int>(chatMessage->getState());
	const int &direction = static_cast<int>(chatMessage->getDirection());
	const string &imdnMessageId = chatMessage->getImdnMessageId();
	const int &isSecured = chatMessage->isSecured() ? 1 : 0;

	*session << "INSERT INTO conference_chat_message_event ("
		"  event_id, from_sip_address_id, to_sip_address_id,"
		"  time, state, direction, imdn_message_id, is_secured"
		") VALUES ("
		"  :eventId, :localSipaddressId, :remoteSipaddressId,"
		"  :time, :state, :direction, :imdnMessageId, :isSecured"
		")", soci::use(eventId), soci::use(fromSipAddressId), soci::use(toSipAddressId),
		soci::use(messageTime), soci::use(state), soci::use(direction),
		soci::use(imdnMessageId), soci::use(isSecured);

	for (const Content *content : chatMessage->getContents())
		insertContent(eventId, *content);

	return eventId;
}

void MainDbPrivate::updateConferenceChatMessageEvent (const shared_ptr<EventLog> &eventLog) {
	shared_ptr<ChatMessage> chatMessage = static_pointer_cast<ConferenceChatMessageEvent>(eventLog)->getChatMessage();
	shared_ptr<AbstractChatRoom> chatRoom = chatMessage->getChatRoom();
	if (!chatRoom) {
		lError() << "Unable to get a valid chat room. It was removed from database.";
		return;
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	}

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	const EventLogPrivate *dEventLog = eventLog->getPrivate();
	MainDbKeyPrivate *dEventKey = static_cast<MainDbKey &>(dEventLog->dbKey).getPrivate();
	const long long &eventId = dEventKey->storageId;
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	soci::session *session = dbSession.getBackendSession();
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	const int &state = static_cast<int>(chatMessage->getState());
	const string &imdnMessageId = chatMessage->getImdnMessageId();
	*session << "UPDATE conference_chat_message_event SET state = :state, imdn_message_id = :imdnMessageId"
		" WHERE event_id = :eventId",
		soci::use(state), soci::use(imdnMessageId), soci::use(eventId);
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	deleteContents(eventId);
	for (const auto &content : chatMessage->getContents())
		insertContent(eventId, *content);
}
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long long MainDbPrivate::insertConferenceNotifiedEvent (const shared_ptr<EventLog> &eventLog, long long *chatRoomId) {
	long long curChatRoomId;
	const long long &eventId = insertConferenceEvent(eventLog, &curChatRoomId);
	if (eventId < 0)
		return -1;
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	const unsigned int &lastNotifyId = static_pointer_cast<ConferenceNotifiedEvent>(eventLog)->getNotifyId();
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	soci::session *session = dbSession.getBackendSession();
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	*session << "INSERT INTO conference_notified_event (event_id, notify_id)"
		" VALUES (:eventId, :notifyId)", soci::use(eventId), soci::use(lastNotifyId);
	*session << "UPDATE chat_room SET last_notify_id = :lastNotifyId WHERE id = :chatRoomId",
		soci::use(lastNotifyId), soci::use(curChatRoomId);
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	if (chatRoomId)
		*chatRoomId = curChatRoomId;
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	return eventId;
}
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long long MainDbPrivate::insertConferenceParticipantEvent (
	const shared_ptr<EventLog> &eventLog,
	long long *chatRoomId
) {
	long long curChatRoomId;
	const long long &eventId = insertConferenceNotifiedEvent(eventLog, &curChatRoomId);
	if (eventId < 0)
		return -1;
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	shared_ptr<ConferenceParticipantEvent> participantEvent =
		static_pointer_cast<ConferenceParticipantEvent>(eventLog);
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	const long long &participantAddressId = insertSipAddress(
		participantEvent->getParticipantAddress().asString()
	);

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	*session << "INSERT INTO conference_participant_event (event_id, participant_sip_address_id)"
		"  VALUES (:eventId, :participantAddressId)", soci::use(eventId), soci::use(participantAddressId);

	bool isAdmin = eventLog->getType() == EventLog::Type::ConferenceParticipantSetAdmin;
	switch (eventLog->getType()) {
		case EventLog::Type::ConferenceParticipantAdded:
		case EventLog::Type::ConferenceParticipantSetAdmin:
		case EventLog::Type::ConferenceParticipantUnsetAdmin:
			insertChatRoomParticipant(curChatRoomId, participantAddressId, isAdmin);
			break;

		case EventLog::Type::ConferenceParticipantRemoved:
			deleteChatRoomParticipant(curChatRoomId, participantAddressId);
			break;

		default:
			break;
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	}

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	if (chatRoomId)
		*chatRoomId = curChatRoomId;
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	return eventId;
}
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long long MainDbPrivate::insertConferenceParticipantDeviceEvent (const shared_ptr<EventLog> &eventLog) {
	long long chatRoomId;
	const long long &eventId = insertConferenceParticipantEvent(eventLog, &chatRoomId);
	if (eventId < 0)
		return -1;
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	shared_ptr<ConferenceParticipantDeviceEvent> participantDeviceEvent =
		static_pointer_cast<ConferenceParticipantDeviceEvent>(eventLog);
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