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#include <QtGui>

#include "variantdelegate.h"

VariantDelegate::VariantDelegate(QObject *parent)

    : QItemDelegate(parent)

{

    boolExp.setPattern("true|false");

    boolExp.setCaseSensitivity(Qt::CaseInsensitive);

    byteArrayExp.setPattern("[\\x00-\\xff]*");

    charExp.setPattern(".");

    colorExp.setPattern("\\(([0-9]*),([0-9]*),([0-9]*),([0-9]*)\\)");

    doubleExp.setPattern("");

    pointExp.setPattern("\\((-?[0-9]*),(-?[0-9]*)\\)");

    rectExp.setPattern("\\((-?[0-9]*),(-?[0-9]*),(-?[0-9]*),(-?[0-9]*)\\)");

    signedIntegerExp.setPattern("-?[0-9]*");

    sizeExp = pointExp;

    unsignedIntegerExp.setPattern("[0-9]*");

    dateExp.setPattern("([0-9]{,4})-([0-9]{,2})-([0-9]{,2})");

    timeExp.setPattern("([0-9]{,2}):([0-9]{,2}):([0-9]{,2})");

    dateTimeExp.setPattern(dateExp.pattern() + "T" + timeExp.pattern());

}

void VariantDelegate::paint(QPainter *painter,

                            const QStyleOptionViewItem &option,

                            const QModelIndex &index) const

{

    if (index.column() == 2) {

        QVariant value = index.model()->data(index, Qt::UserRole);

        if (!isSupportedType(value.type())) {

            QStyleOptionViewItem myOption = option;

            myOption.state &= ~QStyle::State_Enabled;

            QItemDelegate::paint(painter, myOption, index);

            return;

        }

    }

    QItemDelegate::paint(painter, option, index);

}

QWidget *VariantDelegate::createEditor(QWidget *parent,

        const QStyleOptionViewItem & /* option */,

        const QModelIndex &index) const

{

    if (index.column() != 2)

        return 0;

    QVariant originalValue = index.model()->data(index, Qt::UserRole);

    if (!isSupportedType(originalValue.type()))

        return 0;

    QLineEdit *lineEdit = new QLineEdit(parent);

    lineEdit->setFrame(false);

    QRegExp regExp;

    switch (originalValue.type()) {

    case QVariant::Bool:

        regExp = boolExp;

        break;

    case QVariant::ByteArray:

        regExp = byteArrayExp;

        break;

    case QVariant::Char:

        regExp = charExp;

        break;

    case QVariant::Color:

        regExp = colorExp;

        break;

    case QVariant::Date:

        regExp = dateExp;

        break;

    case QVariant::DateTime:

        regExp = dateTimeExp;

        break;

    case QVariant::Double:

        regExp = doubleExp;

        break;

    case QVariant::Int:

    case QVariant::LongLong:

        regExp = signedIntegerExp;

        break;

    case QVariant::Point:

        regExp = pointExp;

        break;

    case QVariant::Rect:

        regExp = rectExp;

        break;

    case QVariant::Size:

        regExp = sizeExp;

        break;

    case QVariant::Time:

        regExp = timeExp;

        break;

    case QVariant::UInt:

    case QVariant::ULongLong:

        regExp = unsignedIntegerExp;

        break;

    default:

        ;

    }

    if (!regExp.isEmpty()) {

        QValidator *validator = new QRegExpValidator(regExp, lineEdit);

        lineEdit->setValidator(validator);

    }

    return lineEdit;

}

void VariantDelegate::setEditorData(QWidget *editor,

                                    const QModelIndex &index) const

{

    QVariant value = index.model()->data(index, Qt::UserRole);

    if (QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor))

        lineEdit->setText(displayText(value));

}

void VariantDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,

                                   const QModelIndex &index) const

{

    QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor);

    if (!lineEdit->isModified())

        return;

    QString text = lineEdit->text();

    const QValidator *validator = lineEdit->validator();

    if (validator) {

        int pos;

        if (validator->validate(text, pos) != QValidator::Acceptable)

            return;

    }

    QVariant originalValue = index.model()->data(index, Qt::UserRole);

    QVariant value;

    switch (originalValue.type()) {

    case QVariant::Char:

        value = text.at(0);

        break;

    case QVariant::Color:

        colorExp.exactMatch(text);

        value = QColor(qMin(colorExp.cap(1).toInt(), 255),

                       qMin(colorExp.cap(2).toInt(), 255),

                       qMin(colorExp.cap(3).toInt(), 255),

                       qMin(colorExp.cap(4).toInt(), 255));

        break;

    case QVariant::Date:

        {

            QDate date = QDate::fromString(text, Qt::ISODate);

            if (!date.isValid())

                return;

            value = date;

        }

        break;

    case QVariant::DateTime:

        {

            QDateTime dateTime = QDateTime::fromString(text, Qt::ISODate);

            if (!dateTime.isValid())

                return;

            value = dateTime;

        }

        break;

    case QVariant::Point:

        pointExp.exactMatch(text);

        value = QPoint(pointExp.cap(1).toInt(), pointExp.cap(2).toInt());

        break;

    case QVariant::Rect:

        rectExp.exactMatch(text);

        value = QRect(rectExp.cap(1).toInt(), rectExp.cap(2).toInt(),

                      rectExp.cap(3).toInt(), rectExp.cap(4).toInt());

        break;

    case QVariant::Size:

        sizeExp.exactMatch(text);

        value = QSize(sizeExp.cap(1).toInt(), sizeExp.cap(2).toInt());

        break;

    case QVariant::StringList:

        value = text.split(",");

        break;

    case QVariant::Time:

        {

            QTime time = QTime::fromString(text, Qt::ISODate);

            if (!time.isValid())

                return;

            value = time;

        }

        break;

    default:

        value = text;

        value.convert(originalValue.type());

    }

    model->setData(index, displayText(value), Qt::DisplayRole);

    model->setData(index, value, Qt::UserRole);

}

bool VariantDelegate::isSupportedType(QVariant::Type type)

{

    switch (type) {

    case QVariant::Bool:

    case QVariant::ByteArray:

    case QVariant::Char:

    case QVariant::Color:

    case QVariant::Date:

    case QVariant::DateTime:

    case QVariant::Double:

    case QVariant::Int:

    case QVariant::LongLong:

    case QVariant::Point:

    case QVariant::Rect:

    case QVariant::Size:

    case QVariant::String:

    case QVariant::StringList:

    case QVariant::Time:

    case QVariant::UInt:

    case QVariant::ULongLong:

        return true;

    default:

        return false;

    }

}

QString VariantDelegate::displayText(const QVariant &value)

{

    switch (value.type()) {

    case QVariant::Bool:

    case QVariant::ByteArray:

    case QVariant::Char:

    case QVariant::Double:

    case QVariant::Int:

    case QVariant::LongLong:

    case QVariant::String:

    case QVariant::UInt:

    case QVariant::ULongLong:

        return value.toString();

    case QVariant::Color:

        {

            QColor color = qvariant_cast<QColor>(value);

            return QString("(%1,%2,%3,%4)")

                   .arg(color.red()).arg(color.green())

                   .arg(color.blue()).arg(color.alpha());

        }

    case QVariant::Date:

        return value.toDate().toString(Qt::ISODate);

    case QVariant::DateTime:

        return value.toDateTime().toString(Qt::ISODate);

    case QVariant::Invalid:

        return "<Invalid>";

    case QVariant::Point:

        {

            QPoint point = value.toPoint();

            return QString("(%1,%2)").arg(point.x()).arg(point.y());

        }

    case QVariant::Rect:

        {

            QRect rect = value.toRect();

            return QString("(%1,%2,%3,%4)")

                   .arg(rect.x()).arg(rect.y())

                   .arg(rect.width()).arg(rect.height());

        }

    case QVariant::Size:

        {

            QSize size = value.toSize();

            return QString("(%1,%2)").arg(size.width()).arg(size.height());

        }

    case QVariant::StringList:

        return value.toStringList().join(",");

    case QVariant::Time:

        return value.toTime().toString(Qt::ISODate);

    default:

        break;

    }

    return QString("<%1>").arg(value.typeName());

}