/*
 * SPDX-FileCopyrightText: 2006 Peter Penz (peter.penz@gmx.at) and Patrice Tremblay
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "statusbarspaceinfo.h"

#include "spaceinfoobserver.h"

#include <KLocalizedString>
#include <KMoreToolsMenuFactory>

#include <KIO/Global>
#include <QMouseEvent>

StatusBarSpaceInfo::StatusBarSpaceInfo(QWidget *parent)
    : KCapacityBar(KCapacityBar::DrawTextInline, parent)
    , m_observer(nullptr)
{
    setCursor(Qt::PointingHandCursor);
}

StatusBarSpaceInfo::~StatusBarSpaceInfo()
{
}

void StatusBarSpaceInfo::setShown(bool shown)
{
    m_shown = shown;
    if (!m_shown) {
        hide();
        m_ready = false;
    }
}

void StatusBarSpaceInfo::setUrl(const QUrl &url)
{
    if (m_url != url) {
        m_url = url;
        m_ready = false;
        if (m_observer) {
            m_observer.reset(new SpaceInfoObserver(m_url, this));
            connect(m_observer.data(), &SpaceInfoObserver::valuesChanged, this, &StatusBarSpaceInfo::slotValuesChanged);
        }
    }
}

QUrl StatusBarSpaceInfo::url() const
{
    return m_url;
}

void StatusBarSpaceInfo::update()
{
    if (m_observer) {
        m_observer->update();
    }
}

void StatusBarSpaceInfo::showEvent(QShowEvent *event)
{
    if (m_shown) {
        if (m_ready) {
            KCapacityBar::showEvent(event);
        }

        if (m_observer.isNull()) {
            m_observer.reset(new SpaceInfoObserver(m_url, this));
            connect(m_observer.data(), &SpaceInfoObserver::valuesChanged, this, &StatusBarSpaceInfo::slotValuesChanged);
        }
    }
}

void StatusBarSpaceInfo::hideEvent(QHideEvent *event)
{
    if (m_ready) {
        m_observer.reset();
        m_ready = false;
    }
    KCapacityBar::hideEvent(event);
}

void StatusBarSpaceInfo::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        // Creates a menu with tools that help to find out more about free
        // disk space for the given url.

        // Note that this object must live long enough in case the user opens
        // the "Configure..." dialog
        KMoreToolsMenuFactory menuFactory(QStringLiteral("dolphin/statusbar-diskspace-menu"));
        menuFactory.setParentWidget(this);
        auto menu = menuFactory.createMenuFromGroupingNames({"disk-usage", "more:", "disk-partitions"}, m_url);

        menu->exec(QCursor::pos());
    }
}

void StatusBarSpaceInfo::slotValuesChanged()
{
    Q_ASSERT(m_observer);
    const quint64 size = m_observer->size();

    if (!m_shown || size == 0) {
        hide();
        return;
    }

    m_ready = true;

    const quint64 available = m_observer->available();
    const quint64 used = size - available;
    const int percentUsed = qRound(100.0 * qreal(used) / qreal(size));

    setText(i18nc("@info:status Free disk space", "%1 free", KIO::convertSize(available)));
    setToolTip(i18nc("tooltip:status Free disk space", "%1 free out of %2 (%3% used)", KIO::convertSize(available), KIO::convertSize(size), percentUsed));
    setUpdatesEnabled(false);
    setValue(percentUsed);
    setUpdatesEnabled(true);

    if (!isVisible()) {
        show();
    } else {
        update();
    }
}