// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include <e32cons.h>

#include <e32keys.h>

#include <e32base.h>

#include <w32std.h>

#include <gdi.h>

#include <bitstd.h>

#include <bitdev.h>

const TInt KGroupId = 0x100039e7;

class CWsConsoleMux;

class CWsConsole;

// Active object to listen to Wserv events. Only used when

// application thread has installed an active scheduler

//

NONSHARABLE_CLASS(CWsKeyReader): public CActive

	{

public:

	CWsKeyReader(CWsConsoleMux* aMux);

	void MakeRequest();

protected:

	void RunL();

	void DoCancel();

private:

	CWsConsoleMux* iMux; //uses

	};

// Master console to dispatch key events to relevant console in situation where 

// a single application thread owns multiple instances of console (CConsoleBase).

// Reference counted as only a single instance of this class will be created

// for each thread.

//

NONSHARABLE_CLASS(CWsConsoleMux): public CBase

	{

public:

	static TInt Open();

	static void Close();

	static CWsConsoleMux* Static();

	~CWsConsoleMux();

	void MakeRequest(CWsConsole* aConsole);

	void CancelRequest(CWsConsole* aConsole);

	void RequestComplete();

	inline RWsSession& Session();

	inline RWindowGroup& Group();

	inline CWindowGc& Gc();

	inline CWsScreenDevice& Screen();

private:

	static CWsConsoleMux* NewL();

	CWsConsoleMux();

	void ConstructL();

private:

	TInt iRefCount;

	RWsSession iWs;

	RWindowGroup iGroup;

	CWsScreenDevice* iScr;

	CWindowGc* iGc;

	CWsConsole* iConsole;

	CWsKeyReader* iReader;

	};

// Console that uses direct Wserv API. Each console will own a window and 

// a bitmap for its backing store, but will be sharing Wserv session, window group,

// screen device and window drawing context

//

NONSHARABLE_CLASS(CWsConsole): public CConsoleBase

	{

	friend class CWsConsoleMux;

public:

	CWsConsole();

	virtual ~CWsConsole();

	//from CConsoleBase 

	virtual TInt Create(const TDesC &aTitle,TSize aSize);

	virtual void Read(TRequestStatus &aStatus);

	virtual void ReadCancel();

	virtual void Write(const TDesC &aDes);

	virtual TPoint CursorPos() const;

	virtual void SetCursorPosAbs(const TPoint &aPoint);

	virtual void SetCursorPosRel(const TPoint &aPoint);

	virtual void SetCursorHeight(TInt aPercentage);

	virtual void SetTitle(const TDesC &aTitle);

	virtual void ClearScreen();

	virtual void ClearToEndOfLine();

	virtual TSize ScreenSize() const;

	virtual TKeyCode KeyCode() const;

	virtual TUint KeyModifiers() const;

private:	

	// for CWsConsoleMux

	TRequestStatus* ReadStatus();

	void SetKey(TUint aCode, TUint aModifier);

	// internal

	void ConstructL();

	void DrawNow();

	void Scroll();

	TPoint WritePos();

	void CarriageReturn();

	void LineFeed();

	void Left();

	void Right();

	void WriteChar(TText);

private:

	// window stuff

	RWindow iWin;

	TSize iWindowSize;

	// back buffer

	CFbsBitmap* iBitmap;

	CFbsBitGc* iBitGc;

	CFbsBitmapDevice* iBitDev;

	// console stuff in chars dimension

	TPoint iCursorPos; //The position of the cursor is on the baseline

	TSize iSizeInChars;

	// font stuff

	CFont* iFont;

	TSize iCharSize;

	TInt iFontAscent;

	TInt iFontDescent;

	TKeyCode iKeyCode;

	TUint iModifiers;

	TTextCursor iTextCursor;

	// master console

	CWsConsoleMux* iMux;

	TRequestStatus* iReadStatus;

	};

//

// CWsKeyReader implementation

//

//

//

CWsKeyReader::CWsKeyReader(CWsConsoleMux* aMux):

	CActive(CActive::EPriorityStandard),

	iMux(aMux)	

	{

	CActiveScheduler::Add(this);

	}

void CWsKeyReader::MakeRequest()

	{

	SetActive();

	iMux->Session().EventReady(&iStatus);

	}

void CWsKeyReader::RunL()

	{

	// let master console decide what to do

	iMux->RequestComplete();

	}

void CWsKeyReader::DoCancel()

	{

	iMux->Session().EventReadyCancel();

	}

//

// CWsConsoleMux implementation

//

//

//

TInt CWsConsoleMux::Open()

	{

	CWsConsoleMux* mux = (CWsConsoleMux*)Dll::Tls();

	// not the first time, simply increment refcount

	if (mux)

		{

		++mux->iRefCount;

		return KErrNone;

		}

	// first time, let's create master console and

	// stick it to TLS

	TRAPD(err, mux = CWsConsoleMux::NewL());

	if (err != KErrNone)

		{

		return err;

		}

	err = Dll::SetTls(mux);

	if (err != KErrNone)

		{

		delete mux;

		return err;

		}

	++mux->iRefCount;			

	return KErrNone;

	}

void CWsConsoleMux::Close()

	{

	CWsConsoleMux* mux = (CWsConsoleMux*)Dll::Tls();

	if (!mux)

		{

		return;

		}

	// destroy master console if this is the last use from

	// this thread and reset TLS

	if (--mux->iRefCount == 0)

		{

		delete mux;

		Dll::FreeTls();

		}

	}

CWsConsoleMux* CWsConsoleMux::Static()

	{

	return (CWsConsoleMux*)Dll::Tls();

	}

CWsConsoleMux::CWsConsoleMux()

	{

	}

CWsConsoleMux::~CWsConsoleMux()

	{

	delete iReader;

	delete iGc;

	delete iScr;

	iGroup.Close();

	iWs.Close();

	}

CWsConsoleMux* CWsConsoleMux::NewL()

	{

	CWsConsoleMux* mux = new(ELeave) CWsConsoleMux;

	CleanupStack::PushL(mux);

	mux->ConstructL();

	CleanupStack::Pop(mux);

	return mux;

	}

void CWsConsoleMux::ConstructL()

	{

	TInt err = iWs.Connect();

	User::LeaveIfError(err);

	iScr = new(ELeave) CWsScreenDevice(iWs);

	err = iScr->Construct();

	User::LeaveIfError(err);

	iGc = new(ELeave) CWindowGc(iScr);

	err = iGc->Construct();

	User::LeaveIfError(err);

	iGroup = RWindowGroup(iWs);

	err = iGroup.Construct(KGroupId, ETrue);

	User::LeaveIfError(err);

	// we will be using active object to listen to Wserv events

	// only if this thread already has active scheduler

	//

	if (CActiveScheduler::Current())

		{

		iReader = new(ELeave) CWsKeyReader(this);

		}

	}

RWsSession& CWsConsoleMux::Session()

 	{

 	return iWs;

 	}

RWindowGroup& CWsConsoleMux::Group()

	{

	return iGroup;

	}

CWindowGc& CWsConsoleMux::Gc()

	{

	return *iGc;

	}

CWsScreenDevice& CWsConsoleMux::Screen()

	{

	return *iScr;

	}

void CWsConsoleMux::MakeRequest(CWsConsole* aConsole)

	{

	if (!iReader)

		{

		// client does not have scheduler, ideally we should use

		// secondary thread to make this asynchronous.

		//

		// however, we can get away with this because application 

		// that doesn't use active scheduler will be calling asynchronous console read 

		// and immediately followed by WaitForRequest e.g.

		//

		// while (1)

		//	{

		//	...

		//	console->Read(status);

		//	User::WaitForRequest(status);

		//	...

		//	}

		//

		TWsEvent event;

		// keep going until we got key event

		do

			{

			TRequestStatus s;

			s = KRequestPending;

			iWs.EventReady(&s);

			User::WaitForRequest(s);

			iWs.GetEvent(event);

			}

		while (event.Type() != EEventKey);

		aConsole->SetKey(event.Key()->iCode, event.Key()->iModifiers);

		TRequestStatus* pS = aConsole->ReadStatus();

		User::RequestComplete(pS, KErrNone);

		}

	else

		{

		iConsole = aConsole;

		iReader->MakeRequest();

		}

	}

// called from key listener RunL

//

void CWsConsoleMux::RequestComplete()

	{

	TWsEvent event;

	iWs.GetEvent(event);

	if (event.Type() == EEventKey)

		{

		iConsole->SetKey(event.Key()->iCode, event.Key()->iModifiers);

		TRequestStatus* pS = iConsole->ReadStatus();

		User::RequestComplete(pS, KErrNone);

		iConsole = NULL;

		}

	else

		{

		// keep going until we got key event

		//

		iReader->MakeRequest();

		}

	}

void CWsConsoleMux::CancelRequest(CWsConsole* aConsole)

	{

	if (iReader && iConsole == aConsole)

		{

		iReader->Cancel();

		}

	}

//

// CWsConsole implementation

//

//

//

CWsConsole::CWsConsole()

	{

	}

CWsConsole::~CWsConsole()

	{

	if(iBitGc)

		{

		iBitGc->DiscardFont();

		}

	if(iBitDev)

		{

		iBitDev->ReleaseFont(iFont);

		}

	delete iBitGc;

	delete iBitDev;

	delete iBitmap;	

	iWin.Close();

	iMux->Session().Flush();

	CWsConsoleMux::Close();

	}

TInt CWsConsole::Create(const TDesC& /*aTitle*/, TSize /*aSize*/)

	{

	// we must not push this object to cleanup stack during construction because

	// caller will explicitly call delete on this object when Create() returns error

	//

	TRAPD(err, ConstructL());

	return err;

	}

void CWsConsole::ConstructL()

	{

	TInt err = CWsConsoleMux::Open();

	User::LeaveIfError(err);

	iMux = CWsConsoleMux::Static();

	iWindowSize = iMux->Screen().SizeInPixels();

	iBitmap = new(ELeave) CFbsBitmap;

	err = iBitmap->Create(iWindowSize, EGray2);

	User::LeaveIfError(err);

	iBitDev = CFbsBitmapDevice::NewL(iBitmap);

	err = iBitDev->CreateContext(iBitGc);

	User::LeaveIfError(err);

	iBitGc->SetPenColor(KRgbBlack);

	iBitGc->SetBrushStyle(CGraphicsContext::ESolidBrush);

	iBitGc->SetBrushColor(KRgbWhite);

	iBitGc->Clear();

	TFontSpec fs(_L("DejaVu Sans Mono"), 12);

	err = iBitDev->GetNearestFontToDesignHeightInPixels(iFont, fs);

	User::LeaveIfError(err);

	iBitGc->UseFont(iFont);

	// uses monospace font to get uniform glpyh size

	iCharSize.iHeight = iFont->FontMaxAscent() + iFont->FontMaxDescent();

	iCharSize.iWidth = iFont->MaxCharWidthInPixels();

	iFontAscent = iFont->FontMaxAscent();

	iFontDescent= iFont->FontMaxDescent();

	// cursor represent char position in character-based area

	// eshell is using 0,0 based

	iCursorPos = TPoint(1,1);

	// console size in number of characters and lines

	iSizeInChars.iWidth = iWindowSize.iWidth / iCharSize.iWidth;

	iSizeInChars.iHeight = iWindowSize.iHeight / iCharSize.iHeight;

	iTextCursor.iType = TTextCursor::ETypeRectangle;

	iTextCursor.iHeight = iCharSize.iHeight;

	iTextCursor.iAscent = iFontAscent;

	iTextCursor.iWidth = iCharSize.iWidth;

	iTextCursor.iFlags = 0;

	iTextCursor.iColor = KRgbWhite;

	iWin = RWindow(iMux->Session());

	err = iWin.Construct(iMux->Group(), (TInt)this);

	User::LeaveIfError(err);

	iWin.Activate();

	iMux->Session().Flush();

	}

TRequestStatus* CWsConsole::ReadStatus()

	{

	return iReadStatus;

	}

void CWsConsole::SetKey(TUint aCode, TUint aModifier) 

	{

	iKeyCode = (TKeyCode)aCode;

	iModifiers = aModifier;

	}

TPoint CWsConsole::WritePos()

	{

	return TPoint((iCursorPos.iX - 1) * iCharSize.iWidth, (iCursorPos.iY - 1) * iCharSize.iHeight + iFontAscent);

	}

void CWsConsole::Read(TRequestStatus &aStatus)

	{

	iReadStatus = &aStatus;

	*iReadStatus = KRequestPending;

	iMux->MakeRequest(this);

	}

void CWsConsole::ReadCancel()

	{

	iMux->CancelRequest(this);

	iReadStatus = NULL;

	}

void CWsConsole::CarriageReturn()

	{

	iCursorPos.iX = 1;

	}

void CWsConsole::LineFeed()

	{

	CarriageReturn();

	if (iCursorPos.iY < iSizeInChars.iHeight)

		{

		++iCursorPos.iY;

		}

	else

		{

		Scroll();

		}

	}

void CWsConsole::Left()