/*******************************************************************************
 * libretroshare/src/gxs/: rsgxsnotify.h                                       *
 *                                                                             *
 * libretroshare: retroshare core library                                      *
 *                                                                             *
 * Copyright (C) 2015  Retroshare Team <contact@retroshare.cc>          *
 *                                                                             *
 * This program 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, either version 3 of the          *
 * License, or (at your option) any later version.                             *
 *                                                                             *
 * 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 Lesser General Public License for more details.                         *
 *                                                                             *
 * You should have received a copy of the GNU Lesser General Public License    *
 * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
 *                                                                             *
 *******************************************************************************/

#pragma once

/*!
 * The aim of this class is to implement notifications internally to GXS, which are
 * mostly used by RsGenExchange to send information to specific services. These services
 * then interpret these changes and turn them into human-readable/processed service-specific changes.
 */

#include "retroshare/rsids.h"

class RsGxsNotify
{
public:
    RsGxsNotify(const RsGxsGroupId& gid): mGroupId(gid){}
    virtual ~RsGxsNotify()=default;

	enum NotifyType
	{
        TYPE_UNKNOWN                           = 0x00,
        TYPE_PUBLISHED                         = 0x01,
        TYPE_RECEIVED_NEW                      = 0x02,
        TYPE_PROCESSED                         = 0x03,
        TYPE_RECEIVED_PUBLISHKEY               = 0x04,
        TYPE_RECEIVED_DISTANT_SEARCH_RESULTS   = 0x05,
        TYPE_STATISTICS_CHANGED                = 0x06,
        TYPE_UPDATED                           = 0x07,
        TYPE_MESSAGE_DELETED                   = 0x08,
        TYPE_GROUP_DELETED                     = 0x09,
        TYPE_GROUP_SYNC_PARAMETERS_UPDATED     = 0x0a,
        TYPE_GROUP_AUTH_REJECTED               = 0x0b,
    };

	virtual NotifyType getType() = 0;

    RsGxsGroupId mGroupId;			// Group id of the group we're talking about. When the group is deleted, it's useful to know which group
    								// that was although there is no pointers to the actual group data anymore.
};

/*!
 * Relevant to group changes
 */
class RsGxsGroupChange : public RsGxsNotify
{
public:
	RsGxsGroupChange(NotifyType type, const RsGxsGroupId& gid,bool metaChange) : RsGxsNotify(gid),mNewGroupItem(nullptr),mOldGroupItem(nullptr), mNotifyType(type), mMetaChange(metaChange) {}
    virtual ~RsGxsGroupChange() override { delete mOldGroupItem; delete mNewGroupItem ; }

    NotifyType getType() override { return mNotifyType;}
    bool metaChange() { return mMetaChange; }

    RsGxsGrpItem *mNewGroupItem;	// Valid when a group has changed, or a new group is received.
    RsGxsGrpItem *mOldGroupItem;	// only valid when mNotifyType is TYPE_UPDATED

protected:
    NotifyType mNotifyType;
    bool mMetaChange;
};

/*!
 * Relevant to message changes
 */
class RsGxsMsgChange : public RsGxsNotify
{
public:
	RsGxsMsgChange(NotifyType type, const RsGxsGroupId& gid, const RsGxsMessageId& msg_id,bool metaChange)
        : RsGxsNotify(gid), mMsgId(msg_id), mNewMsgItem(nullptr),NOTIFY_TYPE(type), mMetaChange(metaChange) {}
    virtual ~RsGxsMsgChange() override { delete mNewMsgItem ; }

    RsGxsMessageId mMsgId;
    RsGxsMsgItem *mNewMsgItem;

	NotifyType getType(){ return NOTIFY_TYPE;}
    bool metaChange() { return mMetaChange; }
private:
    const NotifyType NOTIFY_TYPE;
    bool mMetaChange;
};

struct RsGxsMsgDeletedChange : RsGxsNotify
{
	RsGxsMsgDeletedChange(
	        const RsGxsGroupId& gid, const RsGxsMessageId& msgId):
	    RsGxsNotify(gid), messageId(msgId) {}

	NotifyType getType() override { return TYPE_MESSAGE_DELETED; }

	const RsGxsMessageId messageId;
};