//===-- MICmnStreamStdinWindows.h -------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

//++
// File:		MIUtilStreamStdin.h
//
// Overview:	CMICmnStreamStdinWindows interface.
//
// Environment:	Compilers:	Visual C++ 12.
//							gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//				Libraries:	See MIReadmetxt. 
//
// Copyright:	None.
//--

#pragma once

// In-house headers:
#include "MICmnBase.h"
#include "MICmnStreamStdin.h"
#include "MIUtilSingletonBase.h"

//++ ============================================================================
// Details:	MI common code class. Specific OS stdin handling implementation.
//			CMICmnStreamStdin instance is set with stdin handler before using the
//			the stream. An instance of this class must be set up and ready to give
//			to the CMICmnStreamStdin before it initialises other CMICmnStreamStdin
//			will give an error.
// Gotchas:	None.
// Authors:	Illya Rudkin 16/06/2014.
// Changes:	None.
//--
class CMICmnStreamStdinWindows
:	public CMICmnBase
,	public CMICmnStreamStdin::IOSStdinHandler
,	public MI::ISingleton< CMICmnStreamStdinWindows >
{
	// Give singleton access to private constructors
	friend MI::ISingleton< CMICmnStreamStdinWindows >;

// Methods:
public:
	bool	Initialize( void );
	bool	Shutdown( void );

// Overridden:
public:
	// From CMICmnStreamStdin::IOSpecificReadStreamStdin
	virtual bool			InputAvailable( bool & vwbAvail );
	virtual const MIchar *	ReadLine( CMIUtilString & vwErrMsg );
	
// Methods:
private:
	/* ctor */	CMICmnStreamStdinWindows( void );
	/* ctor */	CMICmnStreamStdinWindows( const CMICmnStreamStdinWindows & );
	void		operator=( const CMICmnStreamStdinWindows & );
	//
	bool	InputAvailableConsoleWin( bool & vwbAvail );
	bool	InputAvailableApplication( bool & vwbAvail );
	
// Overridden:
private:
	// From CMICmnBase
	/* dtor */ virtual ~CMICmnStreamStdinWindows( void );

// Attributes:
private:
	const MIuint	m_constBufferSize;
	FILE *			m_pStdin;
	MIchar *		m_pCmdBuffer;
	MIchar *		m_pStdinBuffer;				// Custom buffer to store std input
	MIuint			m_nBytesToBeRead;			// Checks that ::fgets() is holding on to data while ::PeekNamedPipe() returns nothing which causes a problem
	bool			m_bRunningInConsoleWin;		// True = The application is being run in a Windows command line prompt window, false = by other means
};