/*  This file is part of the KDE project.

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

This library is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 2.1 or 3 of the License.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "mediaobject.h"

#include "abstractaudioeffect.h"

#include "audioplayer.h"

QT_BEGIN_NAMESPACE

using namespace Phonon;

using namespace Phonon::MMF;

/*! \class MMF::AbstractAudioEffect

  \internal

*/

/*! \namespace Phonon::MMF

  \internal

*/

AbstractAudioEffect::AbstractAudioEffect(QObject *parent,

                                         const QList<EffectParameter> &params)

    :   MediaNode(parent)

    ,   m_params(params)

    ,   m_player(0)

{

}

QList<Phonon::EffectParameter> AbstractAudioEffect::parameters() const

{

    // Convert from QList<MMF::EffectParameter> to QList<Phonon::EffectParameter>

    QList<Phonon::EffectParameter> result;

    EffectParameter param;

    foreach (param, m_params)

        result += param;

    return result;

}

QVariant AbstractAudioEffect::parameterValue(const Phonon::EffectParameter &queriedParam) const

{

    const QVariant &val = m_values.value(queriedParam.id());

    if (val.isNull())

        return queriedParam.defaultValue();

    else

        return val;

}

void AbstractAudioEffect::setParameterValue(const Phonon::EffectParameter &param,

                                            const QVariant &newValue)

{

    m_values.insert(param.id(), newValue);

    if (m_effect.data()) {

        const EffectParameter& internalParam = internalParameter(param.id());

        int err = parameterChanged(internalParam, newValue);

        // TODO: handle audio effect errors

        Q_UNUSED(err);

    }

}

void AbstractAudioEffect::abstractPlayerChanged(AbstractPlayer *player)

{

    m_player = qobject_cast<AbstractMediaPlayer *>(player);

    m_effect.reset();

}

void AbstractAudioEffect::stateChanged(Phonon::State newState,

                                       Phonon::State oldState)

{

    if (Phonon::LoadingState == oldState

        && Phonon::LoadingState != newState)

        createEffect();

}

void AbstractAudioEffect::connectMediaObject(MediaObject *mediaObject)

{

    Q_ASSERT_X(!m_player, Q_FUNC_INFO, "Player already connected");

    Q_ASSERT_X(!m_effect.data(), Q_FUNC_INFO, "Effect already created");

    abstractPlayerChanged(mediaObject->abstractPlayer());

    connect(mediaObject, SIGNAL(stateChanged(Phonon::State, Phonon::State)),

            SLOT(stateChanged(Phonon::State, Phonon::State)));

    connect(mediaObject, SIGNAL(abstractPlayerChanged(AbstractPlayer *)),

            SLOT(abstractPlayerChanged(AbstractPlayer *)));

    if (mediaObject->state() != Phonon::LoadingState)

        createEffect();

}

void AbstractAudioEffect::disconnectMediaObject(MediaObject *mediaObject)

{

    mediaObject->disconnect(this);

    abstractPlayerChanged(0);

}

void AbstractAudioEffect::setEnabled(bool enabled)

{

    TInt err = KErrNone;

    if (enabled)

        // TODO: handle audio effect errors

        TRAP(err, m_effect->EnableL())

    else

        // TODO: handle audio effect errors

        TRAP(err, m_effect->DisableL())

    Q_UNUSED(err);

}

void AbstractAudioEffect::createEffect()

{

    Q_ASSERT_X(m_player, Q_FUNC_INFO, "Invalid media player pointer");

    if (AudioPlayer *audioPlayer = qobject_cast<AudioPlayer *>(m_player)) {

        createEffect(audioPlayer->nativePlayer());

    }

    if (m_effect.data()) {

        EffectParameter param;

	int err = 0;

        foreach (param, m_params) {

            const QVariant value = parameterValue(param);

            err = parameterChanged(param, value);

        }

	Q_UNUSED(err)

    }

}

const MMF::EffectParameter& AbstractAudioEffect::internalParameter(int id) const

{

    const EffectParameter *result = 0;

    for (int i=0; i<m_params.count() && !result; ++i) {

        if (m_params[i].id() == id)

            result = &m_params[i];

    }

    Q_ASSERT_X(result, Q_FUNC_INFO, "Parameter not found");

    return *result;

}

int AbstractAudioEffect::parameterChanged(const EffectParameter &param,

            const QVariant &value)

{

    int err = 0;

    switch (param.id()) {

    case ParameterEnable:

        setEnabled(value.toBool());

        break;

    default:

        {

        const EffectParameter& internalParam = internalParameter(param.id());

        err = effectParameterChanged(internalParam, value);

        }

        break;

    }

    if (!err)

        TRAP(err, m_effect->ApplyL());

    return err;

}

int AbstractAudioEffect::effectParameterChanged(

    const EffectParameter &param, const QVariant &value)

{

    // Default implementation

    Q_ASSERT_X(false, Q_FUNC_INFO, "Effect has no parameters");

    return 0;

}

QT_END_NAMESPACE