/*
 * Copyright (c) Contributors to the Open 3D Engine Project
 * 
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#ifndef CRYINCLUDE_CRYCOMMON_STATOBJBUS_H
#define CRYINCLUDE_CRYCOMMON_STATOBJBUS_H

#include <AzCore/EBus/EBus.h>
#include <AzCore/std/containers/unordered_set.h>

struct IStatObj;

//////////////////////////////////////////////////////////////////////////
//
// Ebus support for handling unique IDs between IStatInstGroup instances.
//
//////////////////////////////////////////////////////////////////////////
using StatInstGroupId = int;

class StatInstGroupEvents
    : public AZ::EBusTraits
{
public:
    const static StatInstGroupId s_InvalidStatInstGroupId = -1;

    virtual ~StatInstGroupEvents() = default;

    // AZ::EBusTraits
    static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
    static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
    using MutexType = AZStd::recursive_mutex;

    virtual StatInstGroupId GenerateStatInstGroupId() = 0;
    virtual void ReleaseStatInstGroupId(StatInstGroupId statInstGroupId) = 0;
    virtual void ReleaseStatInstGroupIdSet(const AZStd::unordered_set<StatInstGroupId>& statInstGroupIdSet) = 0;
    virtual void ReserveStatInstGroupIdRange(StatInstGroupId from, StatInstGroupId to) = 0;
};

using StatInstGroupEventBus = AZ::EBus<StatInstGroupEvents>;

//////////////////////////////////////////////////////////////////////////
//
// EBUS support for triggering necessary updates when IStatObj instances
// caches should be updated when 3D Engine events happen during level loads, 
// shutting down the application, and so forth
//
//////////////////////////////////////////////////////////////////////////
class InstanceStatObjEvents
    : public AZ::EBusTraits
{
public:
    virtual ~InstanceStatObjEvents() = default;

    // AZ::EBusTraits
    static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
    static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
    using MutexType = AZStd::recursive_mutex;

    virtual void ReleaseData()
    {
    }
};

using InstanceStatObjEventBus = AZ::EBus<InstanceStatObjEvents>;

#endif // CRYINCLUDE_CRYCOMMON_STATOBJBUS_H
#pragma once