//===== Copyright (C) 1996-2005, Valve Corporation, All rights reserved. ======//
//
// Purpose: 
//
//===========================================================================//

#ifndef ICVAR_H
#define ICVAR_H
#ifdef _WIN32
#pragma once
#endif

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

class ConCommandBase;
class ConCommand;
class ConVar;
class Color;


//-----------------------------------------------------------------------------
// ConVars/ComCommands are marked as having a particular DLL identifier
//-----------------------------------------------------------------------------
typedef int CVarDLLIdentifier_t;


//-----------------------------------------------------------------------------
// Used to display console messages
//-----------------------------------------------------------------------------
abstract_class IConsoleDisplayFunc
{
public:
	virtual void ColorPrint( const Color& clr, const char *pMessage ) = 0;
	virtual void Print( const char *pMessage ) = 0;
	virtual void DPrint( const char *pMessage ) = 0;
};


//-----------------------------------------------------------------------------
// Purpose: Applications can implement this to modify behavior in ICvar
//-----------------------------------------------------------------------------
#define CVAR_QUERY_INTERFACE_VERSION "VCvarQuery001"
abstract_class ICvarQuery : public IAppSystem
{
public:
	// Can these two convars be aliased?
	virtual bool AreConVarsLinkable( const ConVar *child, const ConVar *parent ) = 0;
};


//-----------------------------------------------------------------------------
// Purpose: DLL interface to ConVars/ConCommands
//-----------------------------------------------------------------------------
abstract_class ICvar : public IAppSystem
{
public:
	// Allocate a unique DLL identifier
	virtual CVarDLLIdentifier_t AllocateDLLIdentifier() = 0;

	// Register, unregister commands
	virtual void			RegisterConCommand( ConCommandBase *pCommandBase ) = 0;
	virtual void			UnregisterConCommand( ConCommandBase *pCommandBase ) = 0;
	virtual void			UnregisterConCommands( CVarDLLIdentifier_t id ) = 0;

	// If there is a +<varname> <value> on the command line, this returns the value.
	// Otherwise, it returns NULL.
	virtual const char*		GetCommandLineValue( const char *pVariableName ) = 0;

	// Try to find the cvar pointer by name
	virtual ConCommandBase *FindCommandBase( const char *name ) = 0;
	virtual const ConCommandBase *FindCommandBase( const char *name ) const = 0;
	virtual ConVar			*FindVar ( const char *var_name ) = 0;
	virtual const ConVar	*FindVar ( const char *var_name ) const = 0;
	virtual ConCommand		*FindCommand( const char *name ) = 0;
	virtual const ConCommand *FindCommand( const char *name ) const = 0;

	// Get first ConCommandBase to allow iteration
	virtual ConCommandBase	*GetCommands( void ) = 0;
	virtual const ConCommandBase *GetCommands( void ) const = 0;

	// Install a global change callback (to be called when any convar changes) 
	virtual void			InstallGlobalChangeCallback( FnChangeCallback_t callback ) = 0;
	virtual void			RemoveGlobalChangeCallback( FnChangeCallback_t callback ) = 0;
	virtual void			CallGlobalChangeCallbacks( ConVar *var, const char *pOldString, float flOldValue ) = 0;

	// Install a console printer
	virtual void			InstallConsoleDisplayFunc( IConsoleDisplayFunc* pDisplayFunc ) = 0;
	virtual void			RemoveConsoleDisplayFunc( IConsoleDisplayFunc* pDisplayFunc ) = 0;
	virtual void			ConsoleColorPrintf( const Color& clr, const char *pFormat, ... ) const = 0;
	virtual void			ConsolePrintf( const char *pFormat, ... ) const = 0;
	virtual void			ConsoleDPrintf( const char *pFormat, ... ) const = 0;

	// Reverts cvars which contain a specific flag
	virtual void			RevertFlaggedConVars( int nFlag ) = 0;

	// Method allowing the engine ICvarQuery interface to take over
	// A little hacky, owing to the fact the engine is loaded
	// well after ICVar, so we can't use the standard connect pattern
	virtual void			InstallCVarQuery( ICvarQuery *pQuery ) = 0;

#if defined( _X360 )
	virtual void			PublishToVXConsole( ) = 0;
#endif
};

#define CVAR_INTERFACE_VERSION "VEngineCvar004"


//-----------------------------------------------------------------------------
// These global names are defined by tier1.h, duplicated here so you
// don't have to include tier1.h
//-----------------------------------------------------------------------------
extern ICvar *cvar;
extern ICvar *g_pCVar;


#endif // ICVAR_H
