/*

* Copyright (c) 2007-2008 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:    Default effect order manager

 *

*/

//  Include Files

#include "shwdefaulteffectmanager.h"

#include <e32math.h>

#include <glxlog.h>

#include <glxtracer.h>

#include "shweffect.h"

#include "shwconstants.h"

#include "shwslideshowenginepanic.h"

// -----------------------------------------------------------------------------

// C++ Constructor. Save a few bits of rom with inlining

// -----------------------------------------------------------------------------

inline CShwDefaultEffectManager::CShwDefaultEffectManager()

	: iEffectOrder( MShwEffectManager::EEffectOrderLinear )	// default order

	{

	TRACER("CShwDefaultEffectManager::CShwDefaultEffectManager()");

	GLX_LOG_INFO( "CShwDefaultEffectManager::CShwDefaultEffectManager()" );

	// no implementation required

	}

// -----------------------------------------------------------------------------

// NewL. Static construction

// -----------------------------------------------------------------------------

CShwDefaultEffectManager* CShwDefaultEffectManager::NewL()

	{

	TRACER("CShwDefaultEffectManager::NewL()");

	GLX_LOG_INFO( "CShwDefaultEffectManager::NewL" );

	CShwDefaultEffectManager* self = new( ELeave ) CShwDefaultEffectManager;

	return self;

	}

// -----------------------------------------------------------------------------

// Destructor.

// -----------------------------------------------------------------------------

CShwDefaultEffectManager::~CShwDefaultEffectManager()

	{

	TRACER("CShwDefaultEffectManager::~CShwDefaultEffectManager");

	GLX_LOG_INFO( "CShwDefaultEffectManager::~CShwDefaultEffectManager" );

	// Delete the effect objects

	ResetAndDestroyEffects( iAvailableEffects );

	iAvailableEffects.Close();

	// Close the "working" effects array

	// Note that iEffects just references the same elements as iAvailableEffects

	// so don't delete them again.

	iEffects.Close();

	}

// -----------------------------------------------------------------------------

// AddEffectL.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::AddEffectL( MShwEffect* aEffect )

	{

	TRACER("CShwDefaultEffectManager::AddEffectL");

    GLX_LOG_INFO( "CShwDefaultEffectManager::AddEffectL" );

    // dont add NULLs to the array

    if( aEffect )

    	{

		iAvailableEffects.AppendL( aEffect );

    	}

	}

// -----------------------------------------------------------------------------

// CurrentEffect.

// -----------------------------------------------------------------------------

MShwEffect* CShwDefaultEffectManager::CurrentEffect()

	{

	TRACER("CShwDefaultEffectManager::CurrentEffect");

	GLX_LOG_INFO( "CShwDefaultEffectManager::CurrentEffect" );

	// check that we have something in iEffects

	__ASSERT_DEBUG( iEffects.Count() > 0 && iEffects.Count() > iCurrentEffect,

		NShwEngine::Panic( NShwEngine::EIncorrectEffectIndex ) );

	return iEffects[ iCurrentEffect ];

	}

// -----------------------------------------------------------------------------

// Effect

// -----------------------------------------------------------------------------

MShwEffect* CShwDefaultEffectManager::Effect( TInt aDirection )

	{

	TRACER("CShwDefaultEffectManager::Effect");

	GLX_LOG_INFO1( "CShwDefaultEffectManager::Effect, direction %d",

		aDirection );

	// check that we have something in iEffects

	__ASSERT_DEBUG( iEffects.Count() > 0 && iEffects.Count() > iCurrentEffect,

		NShwEngine::Panic( NShwEngine::EIncorrectEffectIndex ) );

	TInt nextEffectIndex = CalculateNextEffectIndex( aDirection );

	return iEffects[ nextEffectIndex ];

	}

// -----------------------------------------------------------------------------

// ProceedToEffect.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::ProceedToEffect( TInt aDirection )

	{

	TRACER("CShwDefaultEffectManager::ProceedToEffect");

	GLX_LOG_INFO1( "CShwDefaultEffectManager::ProceedToEffect,\

		direction %d", aDirection );

	// calculate new effects

	CalculateEffects( aDirection );

	}

// -----------------------------------------------------------------------------

// SetEffectOrder.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::SetEffectOrder(MShwEffectManager::TShwEffectOrder

	aOrder)

    {

    TRACER("CShwDefaultEffectManager::SetEffectOrder");

    GLX_LOG_INFO("CShwDefaultEffectManager::SetEffectOrder");

    iEffectOrder = aOrder;

    /// @todo implement the rest for increment 7

    }

// -----------------------------------------------------------------------------

// EffectOrder.

// -----------------------------------------------------------------------------

MShwEffectManager::TShwEffectOrder CShwDefaultEffectManager::EffectOrder()

    {

    TRACER("CShwDefaultEffectManager::EffectOrder");

    GLX_LOG_INFO("CShwDefaultEffectManager::EffectOrder");

    return iEffectOrder;

    }

// -----------------------------------------------------------------------------

// SetProgrammedEffects.

// -----------------------------------------------------------------------------  

void CShwDefaultEffectManager::SetProgrammedEffects( 

	RArray<TShwEffectInfo>& /*aEffects*/ )

    {

    TRACER("CShwDefaultEffectManager::SetProgrammedEffects");

    GLX_LOG_INFO("CShwDefaultEffectManager::SetProgrammedEffects");

    /// @todo implement for increment 7

    }

// -----------------------------------------------------------------------------

// SetDefaultEffect.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::SetDefaultEffectL( TShwEffectInfo aInfo )

    {

    TRACER("CShwDefaultEffectManager::SetDefaultEffectL");

	GLX_LOG_INFO( "CShwDefaultEffectManager::SetDefaultEffectL" );

	// Loop through the effects to find the one with matching info

	TInt index = iAvailableEffects.Count();

	MShwEffect* effect = NULL;

	while( index-- > 0 )

		{

		// get effect

		effect = iAvailableEffects[ index ];

		// get its info

		TShwEffectInfo info = effect->EffectInfo();

		// check if we got a match

		if( info == aInfo )

			{

			break;

			}

		}

	// if no effect or no match

	if( !effect || index < 0 )

		{

		// effect not found

    	User::Leave( KErrArgument );

		}

	// Need to clone the effect as in current release

	// we have once single effect at a time and one effect instance can only

	// handle one visual

	/// @todo fix this so that once the effect order is solved, the effects

	/// are cloned as needed

	MShwEffect* clone = effect->CloneLC();

	iAvailableEffects.AppendL( clone );

    iEffects.Append( effect );

    iEffects.Append( clone );

	// calculate the effects    

    CalculateEffects( 1 );

    }

// -----------------------------------------------------------------------------

// GetActiveEffectsL

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::GetActiveEffectsL( 

	RPointerArray< MShwEffect >& aEffects )

    {

    TRACER("CShwDefaultEffectManager::GetActiveEffectsL");

    GLX_LOG_INFO( "CShwDefaultEffectManager::GetActiveEffectsL" );

    // Retrieve each effect

    for( TInt i = 0; i < iEffects.Count(); ++i )

        {

        // append the effect pointer to the given array

        aEffects.AppendL( iEffects[i] );  

        }

    }

// -----------------------------------------------------------------------------

// CalculateEffects.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::CalculateEffects( TInt aDirection )

    {

    TRACER("CShwDefaultEffectManager::CalculateEffects");

	GLX_LOG_INFO1( "CShwDefaultEffectManager::CalculateEffects,\

		direction %d", aDirection );

    // This method updates both the current and next indices for the given

    // direction.  If we're proceeding forwards, temporarily store the

    // "next" index to set it as "current" after the new "next" value has 

    // been determined (as the next value is determined from the current value).

    if ( aDirection > 0 )

    	{

    	// Next effect is "forward"

    	iCurrentEffect = iNextEffect;

    	}

    else

    	{

    	// moving "backwards"

    	iNextEffect = iCurrentEffect;

    	}

    if( iEffectOrder == MShwEffectManager::EEffectOrderLinear )

        {

        // As iAvailableEffects is used to store the effects it can be 

        // walked directly and the order will always be correct

        //

        TInt nextEffect = CalculateNextEffectIndex( aDirection );

        if ( aDirection > 0 )

        	{

        	// moving forwards

			iNextEffect = nextEffect;

        	}

        else

        	{

        	// moving backwards

        	iCurrentEffect = nextEffect;

        	}

		}

    }

// -----------------------------------------------------------------------------

// ResetAndDestroyEffects.

// -----------------------------------------------------------------------------

void CShwDefaultEffectManager::ResetAndDestroyEffects(RArray< MShwEffect* >&

	aArray)

    {

    TRACER("CShwDefaultEffectManager::ResetAndDestroyEffects");

    // get the count

    TInt count = aArray.Count();

	GLX_LOG_INFO1( 

		"CShwDefaultEffectManager::ResetAndDestroyEffects %d", count );

    // Delete the effect objects

	for( TInt i = 0; i < count; i++ )

		{

		// call the destructor

		delete aArray[ i ];

		}

	aArray.Reset();

    }

// -----------------------------------------------------------------------------

// CalculateNextEffectIndex.

// -----------------------------------------------------------------------------

TInt CShwDefaultEffectManager::CalculateNextEffectIndex( TInt aDirection )

	{

	TRACER("CShwDefaultEffectManager::CalculateNextEffectIndex");

	GLX_LOG_INFO1( 

	        "CShwDefaultEffectManager::CalculateNextEffectIndex %d", aDirection);

	TInt effectsCount = iEffects.Count();	

	// Guard against direction exceeding the number of effects

	TInt direction = aDirection % effectsCount;	

	TInt nextEffect = iCurrentEffect + direction;

	// ensure index is still in bounds

	if ( nextEffect < 0 )

		{

		// -ve index: wrap around to the last element

		nextEffect = effectsCount - 1;

		}

	else if ( nextEffect >= effectsCount )

		{

		// passed the end so return to the start.

		nextEffect = 0;

		}

	return nextEffect;

	}