/* ============================================================
 *
 * This file is part of the KDE project
 *
 * Date        : 2009-01-21
 * Description : Sane interface for KDE
 *
 * Copyright (C) 2009 by Kare Sars <kare dot sars at iki dot fi>
 * Copyright (C) 2014 by Gregor Mitsch: port to KDE5 frameworks
 *
 * 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 of the License, or (at your option) version 3, or any
 * later version accepted by the membership of KDE e.V. (or its
 * successor approved by the membership of KDE e.V.), which shall
 * act as a proxy defined in Section 6 of version 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 program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ============================================================ */

#include "ksaneoption.h"

#include "ksaneoptionwidget.h"

#include <QDebug>

namespace KSaneIface
{

KSaneOption::KSaneOption(const SANE_Handle handle, const int index)
    : QObject(), m_handle(handle), m_index(index)
{
    m_widget = nullptr;
    m_data = nullptr;
    readOption();
}

KSaneOption::~KSaneOption()
{
    if (m_data) {
        free(m_data);
        m_data = nullptr;
    }
    // delete the frame, just in case if no parent is set
    delete m_widget;
    m_widget = nullptr;
}

void KSaneOption::createWidget(QWidget *parent)
{
    if (!m_widget) {
        m_widget = new KSaneOptionWidget(parent, QStringLiteral(""));
    }

    if (m_optDesc) {
        m_widget->setToolTip(sane_i18n(m_optDesc->desc));
    }

    readOption();
    readValue();
}

void KSaneOption::readOption()
{
    m_optDesc = sane_get_option_descriptor(m_handle, m_index);
    updateVisibility();
}

void KSaneOption::updateVisibility()
{
    if (!m_widget) {
        return;
    }

    if (state() == STATE_HIDDEN) {
        m_widget->hide();
    } else {
        m_widget->show();
        m_widget->setEnabled(state() == STATE_SHOWN);
    }
}

KSaneOption::KSaneOptWState KSaneOption::state() const
{
    if (!m_optDesc) {
        return STATE_HIDDEN;
    }

    if (((m_optDesc->cap & SANE_CAP_SOFT_DETECT) == 0) ||
            (m_optDesc->cap & SANE_CAP_INACTIVE) ||
            ((m_optDesc->size == 0) && (optionType(m_optDesc) != TYPE_BUTTON))) {
        return STATE_HIDDEN;
    } else if ((m_optDesc->cap & SANE_CAP_SOFT_SELECT) == 0) {
        return STATE_DISABLED;
    }
    return STATE_SHOWN;
}

bool KSaneOption::needsPolling() const
{
    if (!m_optDesc) {
        return false;
    }

    if ((m_optDesc->cap & SANE_CAP_SOFT_DETECT) && !(m_optDesc->cap & SANE_CAP_SOFT_SELECT)) {
        qDebug() << name() << "optDesc->cap =" << m_optDesc->cap;
        return true;
    }

    return false;
}

QString KSaneOption::name() const
{
    if (m_optDesc == nullptr) {
        return QStringLiteral("");
    }
    return QString::fromUtf8(m_optDesc->name);
}

bool KSaneOption::writeData(void *data)
{
    SANE_Status status;
    SANE_Int res;

    if (state() == STATE_DISABLED) {
        return false;
    }

    status = sane_control_option(m_handle, m_index, SANE_ACTION_SET_VALUE, data, &res);
    if (status != SANE_STATUS_GOOD) {
        qDebug() << m_optDesc->name << "sane_control_option returned:" << sane_strstatus(status);
        // write failed. re read the current setting
        readValue();
        return false;
    }
    if ((res & SANE_INFO_INEXACT) && (m_widget != nullptr)) {
        //qDebug() << "write was inexact. Reload value just in case...";
        readValue();
    }

    if (res & SANE_INFO_RELOAD_OPTIONS) {
        emit optsNeedReload();
        // optReload reloads also the values
    } else if (res & SANE_INFO_RELOAD_PARAMS) {
        // 'else if' because with optReload we force also valReload :)
        emit valsNeedReload();
    }

    return true;
}

void KSaneOption::readValue() {}

SANE_Word KSaneOption::toSANE_Word(unsigned char *data)
{
    SANE_Word tmp;
    // if __BYTE_ORDER is not defined we get #if 0 == 0
#if __BYTE_ORDER == __LITTLE_ENDIAN
    tmp  = (data[0] & 0xff);
    tmp += ((SANE_Word)(data[1] & 0xff)) << 8;
    tmp += ((SANE_Word)(data[2] & 0xff)) << 16;
    tmp += ((SANE_Word)(data[3] & 0xff)) << 24;
#else
    tmp  = (data[3] & 0xff);
    tmp += ((SANE_Word)(data[2] & 0xff)) << 8;
    tmp += ((SANE_Word)(data[1] & 0xff)) << 16;
    tmp += ((SANE_Word)(data[0] & 0xff)) << 24;
#endif
    return tmp;
}

void KSaneOption::fromSANE_Word(unsigned char *data, SANE_Word from)
{
    // if __BYTE_ORDER is not defined we get #if 0 == 0
#if __BYTE_ORDER == __LITTLE_ENDIAN
    data[0] = (from & 0x000000FF);
    data[1] = (from & 0x0000FF00) >> 8;
    data[2] = (from & 0x00FF0000) >> 16;
    data[3] = (from & 0xFF000000) >> 24;
#else
    data[3] = (from & 0x000000FF);
    data[2] = (from & 0x0000FF00) >> 8;
    data[1] = (from & 0x00FF0000) >> 16;
    data[0] = (from & 0xFF000000) >> 24;
#endif
}

bool KSaneOption::getMinValue(float &)
{
    return false;
}
bool KSaneOption::getMaxValue(float &)
{
    return false;
}
bool KSaneOption::getValue(float &)
{
    return false;
}
bool KSaneOption::setValue(float)
{
    return false;
}
bool KSaneOption::getValue(QString &)
{
    return false;
}
bool KSaneOption::setValue(const QString &)
{
    return false;
}
int  KSaneOption::getUnit()
{
    return m_optDesc->unit;
}

bool KSaneOption::storeCurrentData()
{
    SANE_Status status;
    SANE_Int res;

    // check if we can read the value
    if (!hasGui()) {
        return false;
    }
    if (state() == STATE_HIDDEN) {
        return false;
    }

    // read that current value
    if (m_data != nullptr) {
        free(m_data);
    }
    m_data = (unsigned char *)malloc(m_optDesc->size);
    status = sane_control_option(m_handle, m_index, SANE_ACTION_GET_VALUE, m_data, &res);
    if (status != SANE_STATUS_GOOD) {
        qDebug() << m_optDesc->name << "sane_control_option returned" << status;
        return false;
    }
    return true;
}

bool KSaneOption::restoreSavedData()
{
    // check if we have saved any data
    if (m_data == nullptr) {
        return false;
    }

    // check if we can write the value
    if (!hasGui()) {
        return false;
    }
    if (state() == STATE_HIDDEN) {
        return false;
    }
    if (state() == STATE_DISABLED) {
        return false;
    }

    writeData(m_data);
    readValue();
    return true;
}

KSaneOption::KSaneOptType KSaneOption::optionType(const SANE_Option_Descriptor *optDesc)
{
    if (!optDesc) {
        return TYPE_DETECT_FAIL;
    }

    switch (optDesc->constraint_type) {
    case SANE_CONSTRAINT_NONE:
        switch (optDesc->type) {
        case SANE_TYPE_BOOL:
            return TYPE_CHECKBOX;
        case SANE_TYPE_INT:
            if (optDesc->size == sizeof(SANE_Word)) {
                return TYPE_SLIDER;
            }
            qDebug() << "Can not handle:" << optDesc->title;
            qDebug() << "SANE_CONSTRAINT_NONE && SANE_TYPE_INT";
            qDebug() << "size" << optDesc->size << "!= sizeof(SANE_Word)";
            break;
        case SANE_TYPE_FIXED:
            if (optDesc->size == sizeof(SANE_Word)) {
                return TYPE_F_SLIDER;
            }
            qDebug() << "Can not handle:" << optDesc->title;
            qDebug() << "SANE_CONSTRAINT_NONE && SANE_TYPE_FIXED";
            qDebug() << "size" << optDesc->size << "!= sizeof(SANE_Word)";
            break;
        case SANE_TYPE_BUTTON:
            return TYPE_BUTTON;
        case SANE_TYPE_STRING:
            return TYPE_ENTRY;
        case SANE_TYPE_GROUP:
            return TYPE_DETECT_FAIL;
        }
        break;
    case SANE_CONSTRAINT_RANGE:
        switch (optDesc->type) {
        case SANE_TYPE_BOOL:
            return TYPE_CHECKBOX;
        case SANE_TYPE_INT:
            if (optDesc->size == sizeof(SANE_Word)) {
                return TYPE_SLIDER;
            }

            if ((strcmp(optDesc->name, SANE_NAME_GAMMA_VECTOR) == 0) ||
                    (strcmp(optDesc->name, SANE_NAME_GAMMA_VECTOR_R) == 0) ||
                    (strcmp(optDesc->name, SANE_NAME_GAMMA_VECTOR_G) == 0) ||
                    (strcmp(optDesc->name, SANE_NAME_GAMMA_VECTOR_B) == 0)) {
                return TYPE_GAMMA;
            }
            qDebug() << "Can not handle:" << optDesc->title;
            qDebug() << "SANE_CONSTRAINT_RANGE && SANE_TYPE_INT && !SANE_NAME_GAMMA_VECTOR...";
            qDebug() << "size" << optDesc->size << "!= sizeof(SANE_Word)";
            break;
        case SANE_TYPE_FIXED:
            if (optDesc->size == sizeof(SANE_Word)) {
                return TYPE_F_SLIDER;
            }
            qDebug() << "Can not handle:" << optDesc->title;
            qDebug() << "SANE_CONSTRAINT_RANGE && SANE_TYPE_FIXED";
            qDebug() << "size" << optDesc->size << "!= sizeof(SANE_Word)";
            qDebug() << "Analog Gamma vector?";
            break;
        case SANE_TYPE_STRING:
            qDebug() << "Can not handle:" << optDesc->title;
            qDebug() << "SANE_CONSTRAINT_RANGE && SANE_TYPE_STRING";
            return TYPE_DETECT_FAIL;
        case SANE_TYPE_BUTTON:
            return TYPE_BUTTON;
        case SANE_TYPE_GROUP:
            return TYPE_DETECT_FAIL;
        }
        break;
    case SANE_CONSTRAINT_WORD_LIST:
    case SANE_CONSTRAINT_STRING_LIST:
        return TYPE_COMBO;
    }
    return TYPE_DETECT_FAIL;
}

KSaneOptionWidget *KSaneOption::widget()
{
    return m_widget;
}

bool KSaneOption::hasGui()
{
    return false;
}

KLocalizedString KSaneOption::unitString()
{
    switch (m_optDesc->unit) {
    case SANE_UNIT_NONE:        return KLocalizedString();
    case SANE_UNIT_PIXEL:       return ki18ncp("SpinBox parameter unit", " Pixel", " Pixels");
    case SANE_UNIT_BIT:         return ki18ncp("SpinBox parameter unit", " Bit", " Bits");
    case SANE_UNIT_MM:          return ki18nc("SpinBox parameter unit (Millimeter)", " mm");
    case SANE_UNIT_DPI:         return ki18nc("SpinBox parameter unit (Dots Per Inch)", " DPI");
    case SANE_UNIT_PERCENT:     return ki18nc("SpinBox parameter unit (Percentage)", " %");
    case SANE_UNIT_MICROSECOND: return ki18nc("SpinBox parameter unit (Microseconds)", " µs");
    }
    return KLocalizedString();
}

QString KSaneOption::unitDoubleString()
{
    switch (m_optDesc->unit) {
    case SANE_UNIT_NONE:        return QStringLiteral("");
    case SANE_UNIT_PIXEL:       return i18nc("Double numbers. SpinBox parameter unit", " Pixels");
    case SANE_UNIT_BIT:         return i18nc("Double numbers. SpinBox parameter unit", " Bits");
    case SANE_UNIT_MM:          return i18nc("Double numbers. SpinBox parameter unit (Millimeter)", " mm");
    case SANE_UNIT_DPI:         return i18nc("Double numbers. SpinBox parameter unit (Dots Per Inch)", " DPI");
    case SANE_UNIT_PERCENT:     return i18nc("Double numbers. SpinBox parameter unit (Percentage)", " %");
    case SANE_UNIT_MICROSECOND: return i18nc("Double numbers. SpinBox parameter unit (Microseconds)", " µs");
    }
    return QStringLiteral("");
}

}  // NameSpace KSaneIface
