/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2010-03-09
 * Description : Local Contrast settings view.
 *               LDR ToneMapper <zynaddsubfx.sourceforge.net/other/tonemapping>
 *
 * Copyright (C) 2010-2021 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * ============================================================ */

#include "localcontrastsettings.h"

// Qt includes

#include <QString>
#include <QButtonGroup>
#include <QFile>
#include <QFrame>
#include <QGridLayout>
#include <QCheckBox>
#include <QHBoxLayout>
#include <QLabel>
#include <QRegExp>
#include <QTextStream>
#include <QToolButton>
#include <QVBoxLayout>
#include <QStandardPaths>
#include <QApplication>
#include <QStyle>
#include <QUrl>
#include <QIcon>
#include <QMessageBox>

// KDE includes

#include <kconfiggroup.h>
#include <klocalizedstring.h>

// Local includes

#include "dexpanderbox.h"
#include "dfiledialog.h"
#include "dnuminput.h"
#include "digikam_debug.h"
#include "dcombobox.h"

namespace Digikam
{

class Q_DECL_HIDDEN LocalContrastSettings::Private
{

public:

    explicit Private()
      : stretchContrastCheck(nullptr),
        label4              (nullptr),
        label5              (nullptr),
        label6              (nullptr),
        label7              (nullptr),
        label8              (nullptr),
        label9              (nullptr),
        label10             (nullptr),
        label11             (nullptr),
        lowSaturationInput  (nullptr),
        highSaturationInput (nullptr),
        functionInput       (nullptr),
        powerInput1         (nullptr),
        blurInput1          (nullptr),
        powerInput2         (nullptr),
        blurInput2          (nullptr),
        powerInput3         (nullptr),
        blurInput3          (nullptr),
        powerInput4         (nullptr),
        blurInput4          (nullptr),
        expanderBox         (nullptr)
    {
    }

    static const QString  configLowSaturationEntry;
    static const QString  configHighSaturationEntry;
    static const QString  configPower1Entry;
    static const QString  configBlur1Entry;
    static const QString  configPower2Entry;
    static const QString  configBlur2Entry;
    static const QString  configPower3Entry;
    static const QString  configBlur3Entry;
    static const QString  configPower4Entry;
    static const QString  configBlur4Entry;
    static const QString  configStretchContrastEntry;
    static const QString  configFastModeEntry;
    static const QString  configStageOneEntry;
    static const QString  configStageTwoEntry;
    static const QString  configStageThreeEntry;
    static const QString  configStageFourEntry;
    static const QString  configFunctionInputEntry;

    QCheckBox*            stretchContrastCheck;

    QLabel*               label4;
    QLabel*               label5;
    QLabel*               label6;
    QLabel*               label7;
    QLabel*               label8;
    QLabel*               label9;
    QLabel*               label10;
    QLabel*               label11;

    DIntNumInput*         lowSaturationInput;
    DIntNumInput*         highSaturationInput;

    DComboBox*            functionInput;

    DDoubleNumInput*      powerInput1;
    DDoubleNumInput*      blurInput1;
    DDoubleNumInput*      powerInput2;
    DDoubleNumInput*      blurInput2;
    DDoubleNumInput*      powerInput3;
    DDoubleNumInput*      blurInput3;
    DDoubleNumInput*      powerInput4;
    DDoubleNumInput*      blurInput4;

    DExpanderBox*         expanderBox;
};

const QString LocalContrastSettings::Private::configLowSaturationEntry(QLatin1String("LowSaturation"));
const QString LocalContrastSettings::Private::configHighSaturationEntry(QLatin1String("HighSaturation"));
const QString LocalContrastSettings::Private::configPower1Entry(QLatin1String("Power1"));
const QString LocalContrastSettings::Private::configBlur1Entry(QLatin1String("Blur1"));
const QString LocalContrastSettings::Private::configPower2Entry(QLatin1String("Power2"));
const QString LocalContrastSettings::Private::configBlur2Entry(QLatin1String("Blur2"));
const QString LocalContrastSettings::Private::configPower3Entry(QLatin1String("Power3"));
const QString LocalContrastSettings::Private::configBlur3Entry(QLatin1String("Blur3"));
const QString LocalContrastSettings::Private::configPower4Entry(QLatin1String("Power4"));
const QString LocalContrastSettings::Private::configBlur4Entry(QLatin1String("Blur4"));
const QString LocalContrastSettings::Private::configStretchContrastEntry(QLatin1String("StretchContrast"));
const QString LocalContrastSettings::Private::configStageOneEntry(QLatin1String("StageOne"));
const QString LocalContrastSettings::Private::configStageTwoEntry(QLatin1String("StageTwo"));
const QString LocalContrastSettings::Private::configStageThreeEntry(QLatin1String("StageThree"));
const QString LocalContrastSettings::Private::configStageFourEntry(QLatin1String("StageFour"));
const QString LocalContrastSettings::Private::configFunctionInputEntry(QLatin1String("FunctionInput"));

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

LocalContrastSettings::LocalContrastSettings(QWidget* const parent)
    : QWidget(parent),
      d      (new Private)
{
    const int spacing        = QApplication::style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);

    QGridLayout* const grid  = new QGridLayout(parent);

    QWidget* const firstPage = new QWidget();
    QGridLayout* const grid1 = new QGridLayout(firstPage);

    QLabel* const label1     = new QLabel(i18n("Function:"), firstPage);
    d->functionInput         = new DComboBox(firstPage);
    d->functionInput->addItem(i18nc("@item: function type", "Power"));
    d->functionInput->addItem(i18nc("@item: function type", "Linear"));
    d->functionInput->setDefaultIndex(0);
    d->functionInput->setWhatsThis(i18n("<b>Function</b>: This function combines the original RGB "
                                        "channels with the desaturated blurred image. This function is used in each of "
                                        "the tonemapping stages. It can be linear or power. Basically, this function "
                                        "increases the values where both the original and blurred image's value are low "
                                        "and do the opposite on high values."));

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

    d->stretchContrastCheck = new QCheckBox(i18n("Stretch contrast"), firstPage);
    d->stretchContrastCheck->setWhatsThis(i18n("<b>Stretch contrast</b>: This stretches the contrast of the original image. "
                                               "It is applied before the tonemapping process."));
    d->stretchContrastCheck->setChecked(true);

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

    QLabel* const label2   = new QLabel(i18n("Highlights saturation:"), firstPage);
    d->highSaturationInput = new DIntNumInput(firstPage);
    d->highSaturationInput->setRange(0, 100, 1);
    d->highSaturationInput->setDefaultValue(100);
    d->highSaturationInput->setObjectName(QLatin1String("highSaturationInput"));
    d->highSaturationInput->setWhatsThis(i18n("<b>Highlights saturation</b>: Usually the (perceived) saturation is "
                                              "increased. The user can choose to lower the saturation on original highlight "
                                              "and shadows from the image with these parameters."));

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

    QLabel* const label3  = new QLabel(i18n("Shadow saturation:"), firstPage);
    d->lowSaturationInput = new DIntNumInput(firstPage);
    d->lowSaturationInput->setRange(0, 100, 1);
    d->lowSaturationInput->setDefaultValue(100);
    d->lowSaturationInput->setObjectName(QLatin1String("lowSaturationInput"));
    d->lowSaturationInput->setWhatsThis(i18n("<b>Shadow saturation</b>: Usually the (perceived) saturation is "
                                             "increased. The user can choose to lower the saturation on original highlight "
                                             "and shadows from the image with these parameters."));

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

    grid1->addWidget(label1,                  0, 0, 1, 2);
    grid1->addWidget(d->functionInput,        0, 1, 1, 1);
    grid1->addWidget(d->stretchContrastCheck, 1, 0, 1, 1);
    grid1->addWidget(label2,                  2, 0, 1, 2);
    grid1->addWidget(d->highSaturationInput,  3, 0, 1, 2);
    grid1->addWidget(label3,                  4, 0, 1, 2);
    grid1->addWidget(d->lowSaturationInput,   5, 0, 1, 2);
    grid1->setContentsMargins(spacing, spacing, spacing, spacing);
    grid1->setSpacing(spacing);

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

    QWidget* const secondPage = new QWidget();
    QGridLayout* const grid2  = new QGridLayout(secondPage);

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

    d->label4      = new QLabel(i18n("Power:"), secondPage);
    d->powerInput1 = new DDoubleNumInput(firstPage);
    d->powerInput1->setRange(0.0, 100.0, 1.0);
    d->powerInput1->setDefaultValue(30.0);
    d->powerInput1->setObjectName(QLatin1String("powerInput1"));
    d->powerInput1->setWhatsThis(i18n("<b>Power</b>: How strong the effect is applied."));

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

    d->label5      = new QLabel(i18n("Blur:"), secondPage);
    d->blurInput1  = new DDoubleNumInput(firstPage);
    d->blurInput1->setRange(0.0, 1000.0, 1.0);
    d->blurInput1->setDefaultValue(80.0);
    d->blurInput1->setObjectName(QLatin1String("blurInput1"));
    d->blurInput1->setWhatsThis(i18n("<b>Blur</b>: How strong the image is blurred before combining with the original "
                                     "image and with the tonemapping function."));

    grid2->addWidget(d->label4,      0, 0, 1, 1);
    grid2->addWidget(d->powerInput1, 0, 1, 1, 1);
    grid2->addWidget(d->label5,      1, 0, 1, 1);
    grid2->addWidget(d->blurInput1,  1, 1, 1, 1);
    grid2->setContentsMargins(spacing, spacing, spacing, spacing);
    grid2->setSpacing(spacing);

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

    QWidget* const thirdPage = new QWidget();
    QGridLayout* const grid3 = new QGridLayout(thirdPage);

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

    d->label6      = new QLabel(i18n("Power:"), thirdPage);
    d->powerInput2 = new DDoubleNumInput(thirdPage);
    d->powerInput2->setRange(0.0, 100.0, 1.0);
    d->powerInput2->setDefaultValue(30.0);
    d->powerInput2->setObjectName(QLatin1String("powerInput2"));
    d->powerInput2->setWhatsThis(i18n("<b>Power</b>: How strong the effect is applied."));

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

    d->label7     = new QLabel(i18n("Blur:"), thirdPage);
    d->blurInput2 = new DDoubleNumInput(thirdPage);
    d->blurInput2->setRange(0.0, 1000.0, 1.0);
    d->blurInput2->setDefaultValue(80.0);
    d->blurInput2->setObjectName(QLatin1String("blurInput2"));
    d->blurInput2->setWhatsThis(i18n("<b>Blur</b>: How strong the image is blurred before combining with the original "
                                     "image and with the tonemapping function."));

    grid3->addWidget(d->label6,      0, 0, 1, 1);
    grid3->addWidget(d->powerInput2, 0, 1, 1, 1);
    grid3->addWidget(d->label7,      1, 0, 1, 1);
    grid3->addWidget(d->blurInput2,  1, 1, 1, 1);
    grid3->setContentsMargins(spacing, spacing, spacing, spacing);
    grid3->setSpacing(spacing);

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

    QWidget* const fourthPage = new QWidget();
    QGridLayout* const grid4  = new QGridLayout(fourthPage);

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

    d->label8      = new QLabel(i18n("Power:"), fourthPage);
    d->powerInput3 = new DDoubleNumInput(fourthPage);
    d->powerInput3->setRange(0.0, 100.0, 1.0);
    d->powerInput3->setDefaultValue(30.0);
    d->powerInput3->setObjectName(QLatin1String("powerInput3"));
    d->powerInput3->setWhatsThis(i18n("<b>Power</b>: How strong the effect is applied."));

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

    d->label9     = new QLabel(i18n("Blur:"), fourthPage);
    d->blurInput3 = new DDoubleNumInput(fourthPage);
    d->blurInput3->setRange(0.0, 1000.0, 1.0);
    d->blurInput3->setDefaultValue(80.0);
    d->blurInput3->setObjectName(QLatin1String("blurInput3"));
    d->blurInput3->setWhatsThis(i18n("<b>Blur</b>: How strong the image is blurred before combining with the original "
                                     "image and with the tonemapping function."));

    grid4->addWidget(d->label8,      0, 0, 1, 1);
    grid4->addWidget(d->powerInput3, 0, 1, 1, 1);
    grid4->addWidget(d->label9,      1, 0, 1, 1);
    grid4->addWidget(d->blurInput3,  1, 1, 1, 1);
    grid4->setContentsMargins(spacing, spacing, spacing, spacing);
    grid4->setSpacing(spacing);

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

    QWidget* const fifthPage = new QWidget();
    QGridLayout* const grid5 = new QGridLayout(fifthPage);

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

    d->label10     = new QLabel(i18n("Power:"), fifthPage);
    d->powerInput4 = new DDoubleNumInput(fifthPage);
    d->powerInput4->setRange(0.0, 100.0, 1.0);
    d->powerInput4->setDefaultValue(30.0);
    d->powerInput4->setObjectName(QLatin1String("powerInput4"));
    d->powerInput4->setWhatsThis(i18n("<b>Power</b>: How strong the effect is applied."));

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

    d->label11    = new QLabel(i18n("Blur:"), fifthPage);
    d->blurInput4 = new DDoubleNumInput(fifthPage);
    d->blurInput4->setRange(0.0, 1000.0, 1.0);
    d->blurInput4->setDefaultValue(80.0);
    d->blurInput4->setObjectName(QLatin1String("blurInput4"));
    d->blurInput4->setWhatsThis(i18n("<b>Blur</b>: How strong the image is blurred before combining with the original "
                                     "image and with the tonemapping function."));

    grid5->addWidget(d->label10,     0, 0, 1, 1);
    grid5->addWidget(d->powerInput4, 0, 1, 1, 1);
    grid5->addWidget(d->label11,     1, 0, 1, 1);
    grid5->addWidget(d->blurInput4,  1, 1, 1, 1);
    grid5->setContentsMargins(spacing, spacing, spacing, spacing);
    grid5->setSpacing(spacing);

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

    d->expanderBox = new DExpanderBox;
    d->expanderBox->setObjectName(QLatin1String("LocalContrastTool Expander"));
    d->expanderBox->addItem(firstPage, QIcon::fromTheme(QLatin1String("contrast")), i18n("General settings"),
                            QLatin1String("GeneralSettingsContainer"), true);
    d->expanderBox->addItem(secondPage, QIcon::fromTheme(QLatin1String("contrast")), i18n("Stage 1"),
                            QLatin1String("Stage1SettingsContainer"), true);
    d->expanderBox->addItem(thirdPage, QIcon::fromTheme(QLatin1String("contrast")), i18n("Stage 2"),
                            QLatin1String("Stage2SettingsContainer"), true);
    d->expanderBox->addItem(fourthPage, QIcon::fromTheme(QLatin1String("contrast")), i18n("Stage 3"),
                            QLatin1String("Stage3SettingsContainer"), true);
    d->expanderBox->addItem(fifthPage, QIcon::fromTheme(QLatin1String("contrast")), i18n("Stage 4"),
                            QLatin1String("Stage4SettingsContainer"), true);
    d->expanderBox->addStretch();
    d->expanderBox->setCheckBoxVisible(1, true);
    d->expanderBox->setCheckBoxVisible(2, true);
    d->expanderBox->setCheckBoxVisible(3, true);
    d->expanderBox->setCheckBoxVisible(4, true);

    grid->addWidget(d->expanderBox, 0, 0, 1, 1);
    grid->setRowStretch(0, 10);
    grid->setContentsMargins(spacing, spacing, spacing, spacing);
    grid->setSpacing(spacing);

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

    connect(d->expanderBox, SIGNAL(signalItemToggled(int,bool)),
            this, SLOT(slotStageEnabled(int,bool)));

    connect(d->lowSaturationInput, SIGNAL(valueChanged(int)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->highSaturationInput, SIGNAL(valueChanged(int)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->powerInput1, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->blurInput1, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->powerInput2, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->blurInput2, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->powerInput3, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->blurInput3, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->powerInput4, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->blurInput4, SIGNAL(valueChanged(double)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->functionInput, SIGNAL(currentIndexChanged(int)),
            this, SIGNAL(signalSettingsChanged()));

    connect(d->stretchContrastCheck, SIGNAL(toggled(bool)),
            this, SIGNAL(signalSettingsChanged()));
}

LocalContrastSettings::~LocalContrastSettings()
{
    delete d;
}

void LocalContrastSettings::slotStageEnabled(int index, bool b)
{
    switch (index)
    {
        case 1:
        {
            d->label4->setEnabled(b);
            d->powerInput1->setEnabled(b);
            d->label5->setEnabled(b);
            d->blurInput1->setEnabled(b);
            break;
        }

        case 2:
        {
            d->label6->setEnabled(b);
            d->powerInput2->setEnabled(b);
            d->label7->setEnabled(b);
            d->blurInput2->setEnabled(b);
            break;
        }

        case 3:
        {
            d->label8->setEnabled(b);
            d->powerInput3->setEnabled(b);
            d->label9->setEnabled(b);
            d->blurInput3->setEnabled(b);
            break;
        }

        case 4:
        {
            d->label10->setEnabled(b);
            d->powerInput4->setEnabled(b);
            d->label11->setEnabled(b);
            d->blurInput4->setEnabled(b);
            break;
        }
    }

    emit signalSettingsChanged();
}

LocalContrastContainer LocalContrastSettings::settings() const
{
    LocalContrastContainer prm;

    prm.stretchContrast  = d->stretchContrastCheck->isChecked();
    prm.lowSaturation    = d->lowSaturationInput->value();
    prm.highSaturation   = d->highSaturationInput->value();
    prm.functionId       = d->functionInput->currentIndex();

    prm.stage[0].enabled = d->expanderBox->isChecked(1);
    prm.stage[0].power   = d->powerInput1->value();
    prm.stage[0].blur    = d->blurInput1->value();

    prm.stage[1].enabled = d->expanderBox->isChecked(2);
    prm.stage[1].power   = d->powerInput2->value();
    prm.stage[1].blur    = d->blurInput2->value();

    prm.stage[2].enabled = d->expanderBox->isChecked(3);
    prm.stage[2].power   = d->powerInput3->value();
    prm.stage[2].blur    = d->blurInput3->value();

    prm.stage[3].enabled = d->expanderBox->isChecked(4);
    prm.stage[3].power   = d->powerInput4->value();
    prm.stage[3].blur    = d->blurInput4->value();

    return prm;
}

void LocalContrastSettings::setSettings(const LocalContrastContainer& settings)
{
    blockSignals(true);
    d->expanderBox->setEnabled(false);

    d->stretchContrastCheck->setChecked(settings.stretchContrast);
    d->lowSaturationInput->setValue(settings.lowSaturation);
    d->highSaturationInput->setValue(settings.highSaturation);
    d->functionInput->setCurrentIndex(settings.functionId);

    d->expanderBox->setChecked(1, settings.stage[0].enabled);
    d->powerInput1->setValue(settings.stage[0].power);
    d->blurInput1->setValue(settings.stage[0].blur);

    d->expanderBox->setChecked(2, settings.stage[1].enabled);
    d->powerInput2->setValue(settings.stage[1].power);
    d->blurInput2->setValue(settings.stage[1].blur);

    d->expanderBox->setChecked(3, settings.stage[2].enabled);
    d->powerInput3->setValue(settings.stage[2].power);
    d->blurInput3->setValue(settings.stage[2].blur);

    d->expanderBox->setChecked(4, settings.stage[3].enabled);
    d->powerInput4->setValue(settings.stage[3].power);
    d->blurInput4->setValue(settings.stage[3].blur);

/*
    slotStage1Enabled(d->stageOne->isChecked());
    slotStage2Enabled(d->stageTwo->isChecked());
    slotStage3Enabled(d->stageThree->isChecked());
    slotStage4Enabled(d->stageFour->isChecked());
*/

    d->expanderBox->setEnabled(true);
    blockSignals(false);
}

void LocalContrastSettings::resetToDefault()
{
    blockSignals(true);

    d->stretchContrastCheck->setChecked(true);
    d->lowSaturationInput->slotReset();
    d->highSaturationInput->slotReset();
    d->functionInput->slotReset();

    d->expanderBox->setChecked(1, true);
    d->powerInput1->slotReset();
    d->blurInput1->slotReset();

    d->expanderBox->setChecked(2, false);
    d->powerInput2->slotReset();
    d->blurInput2->slotReset();

    d->expanderBox->setChecked(3, false);
    d->powerInput3->slotReset();
    d->blurInput3->slotReset();

    d->expanderBox->setChecked(4, false);
    d->powerInput4->slotReset();
    d->blurInput4->slotReset();

    blockSignals(false);
}

LocalContrastContainer LocalContrastSettings::defaultSettings() const
{
    LocalContrastContainer prm;

    prm.stretchContrast  = true;
    prm.lowSaturation    = d->lowSaturationInput->defaultValue();
    prm.highSaturation   = d->highSaturationInput->defaultValue();
    prm.functionId       = d->functionInput->defaultIndex();

    prm.stage[0].enabled = true;
    prm.stage[0].power   = d->powerInput1->defaultValue();
    prm.stage[0].blur    = d->blurInput1->defaultValue();

    prm.stage[1].enabled = false;
    prm.stage[1].power   = d->powerInput2->defaultValue();
    prm.stage[1].blur    = d->blurInput2->defaultValue();

    prm.stage[2].enabled = false;
    prm.stage[2].power   = d->powerInput3->defaultValue();
    prm.stage[2].blur    = d->blurInput3->defaultValue();

    prm.stage[3].enabled = false;
    prm.stage[3].power   = d->powerInput4->defaultValue();
    prm.stage[3].blur    = d->blurInput4->defaultValue();

    return prm;
}

void LocalContrastSettings::readSettings(KConfigGroup& group)
{
    LocalContrastContainer prm;
    LocalContrastContainer defaultPrm = defaultSettings();

    prm.stretchContrast  = group.readEntry(d->configStretchContrastEntry, defaultPrm.stretchContrast);
    prm.lowSaturation    = group.readEntry(d->configLowSaturationEntry,   defaultPrm.lowSaturation);
    prm.highSaturation   = group.readEntry(d->configHighSaturationEntry,  defaultPrm.highSaturation);
    prm.functionId       = group.readEntry(d->configFunctionInputEntry,   defaultPrm.functionId);

    prm.stage[0].enabled = group.readEntry(d->configStageOneEntry,        defaultPrm.stage[0].enabled);
    prm.stage[0].power   = group.readEntry(d->configPower1Entry,          defaultPrm.stage[0].power);
    prm.stage[0].blur    = group.readEntry(d->configBlur1Entry,           defaultPrm.stage[0].blur);

    prm.stage[1].enabled = group.readEntry(d->configStageTwoEntry,        defaultPrm.stage[1].enabled);
    prm.stage[1].power   = group.readEntry(d->configPower2Entry,          defaultPrm.stage[1].power);
    prm.stage[1].blur    = group.readEntry(d->configBlur2Entry,           defaultPrm.stage[1].blur);

    prm.stage[2].enabled = group.readEntry(d->configStageThreeEntry,      defaultPrm.stage[2].enabled);
    prm.stage[2].power   = group.readEntry(d->configPower3Entry,          defaultPrm.stage[2].power);
    prm.stage[2].blur    = group.readEntry(d->configBlur3Entry,           defaultPrm.stage[2].blur);

    prm.stage[3].enabled = group.readEntry(d->configStageFourEntry,       defaultPrm.stage[3].enabled);
    prm.stage[3].power   = group.readEntry(d->configPower4Entry,          defaultPrm.stage[3].power);
    prm.stage[3].blur    = group.readEntry(d->configBlur4Entry,           defaultPrm.stage[3].blur);

    setSettings(prm);

    d->expanderBox->readSettings(group);

    d->expanderBox->setEnabled(true);
}

void LocalContrastSettings::writeSettings(KConfigGroup& group)
{
    LocalContrastContainer prm = settings();

    group.writeEntry(d->configStretchContrastEntry, prm.stretchContrast);
    group.writeEntry(d->configLowSaturationEntry,   prm.lowSaturation);
    group.writeEntry(d->configHighSaturationEntry,  prm.highSaturation);
    group.writeEntry(d->configFunctionInputEntry,   prm.functionId);

    group.writeEntry(d->configStageOneEntry,        prm.stage[0].enabled);
    group.writeEntry(d->configPower1Entry,          prm.stage[0].power);
    group.writeEntry(d->configBlur1Entry,           prm.stage[0].blur);

    group.writeEntry(d->configStageTwoEntry,        prm.stage[1].enabled);
    group.writeEntry(d->configPower2Entry,          prm.stage[1].power);
    group.writeEntry(d->configBlur2Entry,           prm.stage[1].blur);

    group.writeEntry(d->configStageThreeEntry,      prm.stage[2].enabled);
    group.writeEntry(d->configPower3Entry,          prm.stage[2].power);
    group.writeEntry(d->configBlur3Entry,           prm.stage[2].blur);

    group.writeEntry(d->configStageFourEntry,       prm.stage[3].enabled);
    group.writeEntry(d->configPower4Entry,          prm.stage[3].power);
    group.writeEntry(d->configBlur4Entry,           prm.stage[3].blur);

    d->expanderBox->writeSettings(group);
}

void LocalContrastSettings::loadSettings()
{
    QUrl loadFile = DFileDialog::getOpenFileUrl(qApp->activeWindow(), i18n("Photograph Local Contrast Settings File to Load"),
                                                QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation)),
                                                QLatin1String("*"));

    if (loadFile.isEmpty())
    {
        return;
    }

    QFile file(loadFile.toLocalFile());

    if (file.open(QIODevice::ReadOnly))
    {
        QTextStream stream(&file);

        if (stream.readLine() != QLatin1String("# Photograph Local Contrast Configuration File"))
        {
            QMessageBox::critical(qApp->activeWindow(), qApp->applicationName(),
                                  i18n("\"%1\" is not a Photograph Local Contrast settings text file.",
                                       loadFile.fileName()));
            file.close();
            return;
        }

        blockSignals(true);
        d->stretchContrastCheck->setChecked(stream.readLine().toInt());
        d->expanderBox->setChecked(1, stream.readLine().toInt());
        d->expanderBox->setChecked(2, stream.readLine().toInt());
        d->expanderBox->setChecked(3, stream.readLine().toInt());
        d->expanderBox->setChecked(4, stream.readLine().toInt());
        d->lowSaturationInput->setValue(stream.readLine().toInt());
        d->highSaturationInput->setValue(stream.readLine().toInt());
        d->functionInput->setCurrentIndex(stream.readLine().toInt());
        d->powerInput1->setValue(stream.readLine().toDouble());
        d->blurInput1->setValue(stream.readLine().toDouble());
        d->powerInput2->setValue(stream.readLine().toDouble());
        d->blurInput2->setValue(stream.readLine().toDouble());
        d->powerInput3->setValue(stream.readLine().toDouble());
        d->blurInput3->setValue(stream.readLine().toDouble());
        d->powerInput4->setValue(stream.readLine().toDouble());
        d->blurInput4->setValue(stream.readLine().toDouble());
        blockSignals(false);
    }
    else
    {
        QMessageBox::critical(qApp->activeWindow(), qApp->applicationName(),
                              i18n("Cannot load settings from the Photograph Local Contrast text file."));
    }

    file.close();
}

void LocalContrastSettings::saveAsSettings()
{
    QUrl saveFile = DFileDialog::getSaveFileUrl(qApp->activeWindow(), i18n("Photograph Local Contrast Settings File to Save"),
                                                QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation)),
                                                QLatin1String("*"));

    if (saveFile.isEmpty())
    {
        return;
    }

    QFile file(saveFile.toLocalFile());

    if (file.open(QIODevice::WriteOnly))
    {
        QTextStream stream(&file);
        stream << QLatin1String("# Photograph Local Contrast Configuration File\n");

        stream << d->stretchContrastCheck->isChecked() << QLatin1Char('\n');
        stream << d->expanderBox->isChecked(1) << QLatin1Char('\n');
        stream << d->expanderBox->isChecked(2) << QLatin1Char('\n');
        stream << d->expanderBox->isChecked(3) << QLatin1Char('\n');
        stream << d->expanderBox->isChecked(4) << QLatin1Char('\n');
        stream << d->lowSaturationInput->value() << QLatin1Char('\n');
        stream << d->highSaturationInput->value() << QLatin1Char('\n');
        stream << d->functionInput->currentIndex() << QLatin1Char('\n');
        stream << d->powerInput1->value() << QLatin1Char('\n');
        stream << d->blurInput1->value() << QLatin1Char('\n');
        stream << d->powerInput2->value() << QLatin1Char('\n');
        stream << d->blurInput2->value() << QLatin1Char('\n');
        stream << d->powerInput3->value() << QLatin1Char('\n');
        stream << d->blurInput3->value() << QLatin1Char('\n');
        stream << d->powerInput4->value() << QLatin1Char('\n');
        stream << d->blurInput4->value() << QLatin1Char('\n');
    }
    else
    {
        QMessageBox::critical(qApp->activeWindow(), qApp->applicationName(),
                              i18n("Cannot save settings to the Photograph Local Contrast text file."));
    }

    file.close();
}

} // namespace Digikam