// This file Copyright © Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.

#include <QAbstractItemView>
#include <QApplication>
#include <QColor>
#include <QCoreApplication>
#include <QDataStream>
#include <QFile>
#include <QFileIconProvider>
#include <QFileInfo>
#include <QHeaderView>
#include <QIcon>
#include <QInputDialog>
#include <QMimeDatabase>
#include <QMimeType>
#include <QObject>
#include <QPixmapCache>
#include <QStyle>

#include <libtransmission/transmission.h>

#include "Utils.h"

// ---

namespace
{

bool isSlashChar(QChar const& c)
{
    return c == QLatin1Char('/') || c == QLatin1Char('\\');
}

} // namespace

QIcon Utils::getIconFromIndex(QModelIndex const& index)
{
    QVariant const variant = index.data(Qt::DecorationRole);

#if QT_VERSION >= QT_VERSION_CHECK(6, 2, 0)
    switch (variant.typeId())
#else
    switch (variant.userType())
#endif
    {
    case QMetaType::QIcon:
        return qvariant_cast<QIcon>(variant);

    case QMetaType::QPixmap:
        return qvariant_cast<QPixmap>(variant);

    default:
        return {};
    }
}

QString Utils::removeTrailingDirSeparator(QString const& path)
{
    int i = path.size();

    while (i > 1 && isSlashChar(path[i - 1]))
    {
        --i;
    }

    return path.left(i);
}

int Utils::measureViewItem(QAbstractItemView const* view, QString const& text)
{
    QStyleOptionViewItem option;
    option.initFrom(view);
    option.features = QStyleOptionViewItem::HasDisplay;
    option.text = text;
    option.textElideMode = Qt::ElideNone;
    option.font = view->font();

    return view->style()
        ->sizeFromContents(QStyle::CT_ItemViewItem, &option, QSize{ QWIDGETSIZE_MAX, QWIDGETSIZE_MAX }, view)
        .width();
}

int Utils::measureHeaderItem(QHeaderView const* view, QString const& text)
{
    QStyleOptionHeader option;
    option.initFrom(view);
    option.text = text;
    option.sortIndicator = view->isSortIndicatorShown() ? QStyleOptionHeader::SortDown : QStyleOptionHeader::None;

    return view->style()->sizeFromContents(QStyle::CT_HeaderSection, &option, QSize{}, view).width();
}

QColor Utils::getFadedColor(QColor const& color)
{
    QColor faded_color(color);
    faded_color.setAlpha(128);
    return faded_color;
}

void Utils::updateSpinBoxFormat(QSpinBox* spinBox, char const* context, char const* format, QString const& placeholder)
{
    QString const units_format = QCoreApplication::translate(context, format, nullptr, spinBox->value());
    auto const placeholder_pos = units_format.indexOf(placeholder);
    if (placeholder_pos == -1)
    {
        return;
    }

    auto const units_prefix = units_format.left(placeholder_pos);
    auto const units_suffix = units_format.mid(placeholder_pos + placeholder.size());

    if (spinBox->prefix() != units_prefix)
    {
        spinBox->setPrefix(units_prefix);
    }
    if (spinBox->suffix() != units_suffix)
    {
        spinBox->setSuffix(units_suffix);
    }
}
