//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: A higher level link library for general use in the game and tools.
//
//===========================================================================//

#ifndef TIER1_H
#define TIER1_H

#if defined(_WIN32)
#pragma once
#endif

#include "../appframework/IAppSystem.h"
#include "../tier1/convar.h"

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class ICvar;
class IProcessUtils;

//-----------------------------------------------------------------------------
// These tier1 libraries must be set by any users of this library.
// They can be set by calling ConnectTier1Libraries.
// It is hoped that setting this, and using this library will be the common
// mechanism for allowing link libraries to access tier1 library interfaces
//-----------------------------------------------------------------------------

// These are marked DLL_EXPORT for Linux.
DLL_EXPORT ICvar *cvar;
extern ICvar *g_pCVar;
extern IProcessUtils *g_pProcessUtils;

//-----------------------------------------------------------------------------
// Call this to connect to/disconnect from all tier 1 libraries.
// It's up to the caller to check the globals it cares about to see if ones are
// missing
//-----------------------------------------------------------------------------
void ConnectTier1Libraries(CreateInterfaceFn *pFactoryList, int nFactoryCount);
void DisconnectTier1Libraries();

//-----------------------------------------------------------------------------
// Helper empty implementation of an IAppSystem for tier2 libraries
//-----------------------------------------------------------------------------
template <class IInterface, int ConVarFlag = 0>
class CTier1AppSystem : public CTier0AppSystem<IInterface> {
    typedef CTier0AppSystem<IInterface> BaseClass;

   public:
    CTier1AppSystem(bool bIsPrimaryAppSystem = true)
        : BaseClass(bIsPrimaryAppSystem) {}

    virtual bool Connect(CreateInterfaceFn factory) {
        if (!BaseClass::Connect(factory)) return false;

        if (BaseClass::IsPrimaryAppSystem()) {
            ConnectTier1Libraries(&factory, 1);
        }
        return true;
    }

    virtual void Disconnect() {
        if (BaseClass::IsPrimaryAppSystem()) {
            DisconnectTier1Libraries();
        }
        BaseClass::Disconnect();
    }

    virtual InitReturnVal_t Init() {
        /*InitReturnVal_t nRetVal = BaseClass::Init();
        if ( nRetVal != INIT_OK )
                return nRetVal;

        if ( g_pCVar && BaseClass::IsPrimaryAppSystem() )
        {
                ConVar_Register( ConVarFlag );
        }*/
        return INIT_OK;
    }

    virtual void Shutdown() {
        /*if ( g_pCVar && BaseClass::IsPrimaryAppSystem() )
        {
                ConVar_Unregister( );
        }*/
        BaseClass::Shutdown();
    }
};

#endif  // TIER1_H