#ifndef ICVAR_H
#define ICVAR_H
#include "tier0/annotations.h"
#include "appframework/IAppSystem.h"

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class ConCommandBase;
class ConCommand;
class ConVar;
class IAppSystem;
class Color;

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

//-----------------------------------------------------------------------------
// 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;

	virtual void GetConsoleText(char* pchText, size_t bufSize) const = 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;

	virtual void sub_140599640() = 0;
	virtual void sub_140599BA0() = 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, PRINTF_FORMAT_STRING const char* pFormat, ...) const FMTFUNCTION(3, 4) = 0;
	virtual void			ConsolePrintf(PRINTF_FORMAT_STRING const char* pFormat, ...) const FMTFUNCTION(2, 3) = 0;
	virtual void			ConsoleDPrintf(PRINTF_FORMAT_STRING const char* pFormat, ...) const FMTFUNCTION(2, 3) = 0;

	virtual void sub_140598730() = 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;

	virtual void			SetMaxSplitScreenSlots(int nSlots) = 0;
	virtual int				GetMaxSplitScreenSlots() const = 0;

	virtual int				GetConsoleDisplayFuncCount() const = 0;
	virtual void			GetConsoleText(int nDisplayFuncIndex, char* pchText, size_t bufSize) const = 0;

	// Utilities for convars accessed by the material system thread
	virtual bool			IsMaterialThreadSetAllowed() const = 0;
	virtual void			QueueMaterialThreadSetValue(ConVar* pConVar, const char* pValue) = 0;
	virtual void			QueueMaterialThreadSetValue(ConVar* pConVar, int nValue) = 0;
	virtual void			QueueMaterialThreadSetValue(ConVar* pConVar, float flValue) = 0;
	virtual bool			HasQueuedMaterialThreadConVarSets() const = 0;
	virtual int				ProcessQueuedMaterialThreadConVarSets() = 0;

protected:
	class ICVarIteratorInternal
	{
	public:
		virtual void            SetFirst(void) = 0;
		virtual void            Next(void) = 0;
		virtual bool            IsValid(void) = 0;
		virtual ConCommandBase* Get(void) = 0;
	};

	virtual ICVarIteratorInternal* FactoryInternalIterator(void) = 0;
};

#endif // ICVAR_H