//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//===========================================================================//

#ifndef TIER0_ICOMMANDLINE_H
#define TIER0_ICOMMANDLINE_H
#ifdef _WIN32
#pragma once
#endif

#include "platform.h"

//-----------------------------------------------------------------------------
// Purpose: Interface to engine command line
//-----------------------------------------------------------------------------
abstract_class ICommandLine {
   public:
    virtual void CreateCmdLine(const char *commandline) = 0;
    virtual void CreateCmdLine(int argc, char **argv) = 0;
    virtual const char *GetCmdLine(void) const = 0;

    // Check whether a particular parameter exists
    virtual const char *CheckParm(const char *psz, const char **ppszValue = 0)
        const = 0;
    virtual void RemoveParm(const char *parm) = 0;
    virtual void AppendParm(const char *pszParm, const char *pszValues) = 0;

    // Returns the argument after the one specified, or the default if not found
    virtual const char *ParmValue(const char *psz, const char *pDefaultVal = 0)
        const = 0;
    virtual int ParmValue(const char *psz, int nDefaultVal) const = 0;
    virtual float ParmValue(const char *psz, float flDefaultVal) const = 0;

    // Gets at particular parameters
    virtual int ParmCount() const = 0;
    virtual int FindParm(const char *psz) const = 0;  // Returns 0 if not found.
    virtual const char *GetParm(int nIndex) const = 0;

    // copies the string passwed
    virtual void SetParm(int nIndex, char const *pNewParm) = 0;

    virtual const char *ParmValueByIndex(int nIndex,
                                         const char *pDefaultVal = 0) const = 0;
};

//-----------------------------------------------------------------------------
// Gets a singleton to the commandline interface
// NOTE: The #define trickery here is necessary for backwards compat:
// this interface used to lie in the vstdlib library.
//-----------------------------------------------------------------------------
PLATFORM_INTERFACE ICommandLine *CommandLine_Tier0();

#if !defined(VSTDLIB_BACKWARD_COMPAT)
#define CommandLine CommandLine_Tier0
#endif

#endif  // TIER0_ICOMMANDLINE_H