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

#ifndef TIER3_H
#define TIER3_H

#if defined(_WIN32)
#pragma once
#endif

#include "../tier2/tier2.h"

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class IStudioRender;
class IMatSystemSurface;
class IDataCache;
class IMDLCache;
class IVideoServices;
class IDmeMakefileUtils;
class IPhysicsCollision;
class ISoundEmitterSystemBase;
class IVTex;

namespace vgui {
class ISurface;
class IVGui;
class IInput;
class IPanel;
class ILocalize;
class ISchemeManager;
class ISystem;
}  // namespace vgui

//-----------------------------------------------------------------------------
// These tier3 libraries must be set by any users of this library.
// They can be set by calling ConnectTier3Libraries.
// It is hoped that setting this, and using this library will be the common
// mechanism for allowing link libraries to access tier3 library interfaces
//-----------------------------------------------------------------------------
extern IStudioRender *g_pStudioRender;
extern IStudioRender *studiorender;
extern IMatSystemSurface *g_pMatSystemSurface;
extern vgui::ISurface *g_pVGuiSurface;
extern vgui::IInput *g_pVGuiInput;
extern vgui::IVGui *g_pVGui;
extern vgui::IPanel *g_pVGuiPanel;
extern vgui::ILocalize *g_pVGuiLocalize;
extern vgui::ISchemeManager *g_pVGuiSchemeManager;
extern vgui::ISystem *g_pVGuiSystem;
extern IDataCache *g_pDataCache;  // FIXME: Should IDataCache be in tier2?
extern IMDLCache *g_pMDLCache;
extern IMDLCache *mdlcache;
extern IVideoServices *g_pVideo;
extern IDmeMakefileUtils *g_pDmeMakefileUtils;
extern IPhysicsCollision *g_pPhysicsCollision;
extern ISoundEmitterSystemBase *g_pSoundEmitterSystem;
extern IVTex *g_pVTex;

//-----------------------------------------------------------------------------
// Call this to connect to/disconnect from all tier 3 libraries.
// It's up to the caller to check the globals it cares about to see if ones are
// missing
//-----------------------------------------------------------------------------
void ConnectTier3Libraries(CreateInterfaceFn *pFactoryList, int nFactoryCount);
void DisconnectTier3Libraries();

//-----------------------------------------------------------------------------
// Helper empty implementation of an IAppSystem for tier2 libraries
//-----------------------------------------------------------------------------
template <class IInterface, int ConVarFlag = 0>
class CTier3AppSystem : public CTier2AppSystem<IInterface, ConVarFlag> {
    typedef CTier2AppSystem<IInterface, ConVarFlag> BaseClass;

   public:
    CTier3AppSystem(bool bIsPrimaryAppSystem = true)
        : BaseClass(bIsPrimaryAppSystem) {}

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

        if (BaseClass::IsPrimaryAppSystem()) {
            ConnectTier3Libraries(&factory, 1);
        }
        return true;
    }

    virtual void Disconnect() {
        if (BaseClass::IsPrimaryAppSystem()) {
            DisconnectTier3Libraries();
        }
        BaseClass::Disconnect();
    }
};

#endif  // TIER3_H