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

#ifndef TIER2_H
#define TIER2_H

#if defined(_WIN32)
#pragma once
#endif

#include "../tier1/tier1.h"

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class IFileSystem;
class IMaterialSystem;
class IColorCorrectionSystem;
class IMaterialSystemHardwareConfig;
class IDebugTextureInfo;
class IVBAllocTracker;
class IInputSystem;
class INetworkSystem;
class IP4;
class IMdlLib;
class IQueuedLoader;

//-----------------------------------------------------------------------------
// These tier2 libraries must be set by any users of this library.
// They can be set by calling ConnectTier2Libraries or InitDefaultFileSystem.
// It is hoped that setting this, and using this library will be the common
// mechanism for allowing link libraries to access tier2 library interfaces
//-----------------------------------------------------------------------------
extern IFileSystem *g_pFullFileSystem;
extern IMaterialSystem *materials;
extern IMaterialSystem *g_pMaterialSystem;
extern IInputSystem *g_pInputSystem;
extern INetworkSystem *g_pNetworkSystem;
extern IMaterialSystemHardwareConfig *g_pMaterialSystemHardwareConfig;
extern IDebugTextureInfo *g_pMaterialSystemDebugTextureInfo;
extern IVBAllocTracker *g_VBAllocTracker;
extern IColorCorrectionSystem *colorcorrection;
extern IP4 *p4;
extern IMdlLib *mdllib;
extern IQueuedLoader *g_pQueuedLoader;

//-----------------------------------------------------------------------------
// Call this to connect to/disconnect from all tier 2 libraries.
// It's up to the caller to check the globals it cares about to see if ones are
// missing
//-----------------------------------------------------------------------------
void ConnectTier2Libraries(CreateInterfaceFn *pFactoryList, int nFactoryCount);
void DisconnectTier2Libraries();

//-----------------------------------------------------------------------------
// Call this to get the file system set up to stdio for utilities, etc:
//-----------------------------------------------------------------------------
void InitDefaultFileSystem(void);
void ShutdownDefaultFileSystem(void);

//-----------------------------------------------------------------------------
// for simple utilities using valve libraries, call the entry point below in
// main(). It will init a filesystem for you, init mathlib, and create the
// command line.
//-----------------------------------------------------------------------------
void InitCommandLineProgram(int argc, char **argv);

//-----------------------------------------------------------------------------
// Helper empty implementation of an IAppSystem for tier2 libraries
//-----------------------------------------------------------------------------
template <class IInterface, int ConVarFlag = 0>
class CTier2AppSystem : public CTier1AppSystem<IInterface, ConVarFlag> {
    typedef CTier1AppSystem<IInterface, ConVarFlag> BaseClass;

   public:
    CTier2AppSystem(bool bIsPrimaryAppSystem = true)
        : BaseClass(bIsPrimaryAppSystem) {}

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

        if (BaseClass::IsPrimaryAppSystem()) {
            ConnectTier2Libraries(&factory, 1);
        }

        return true;
    }

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

        return INIT_OK;
    }

    virtual void Shutdown() { BaseClass::Shutdown(); }

    virtual void Disconnect() {
        if (BaseClass::IsPrimaryAppSystem()) {
            DisconnectTier2Libraries();
        }
        BaseClass::Disconnect();
    }
};

#endif  // TIER2_H