/* This file is part of the KDE libraries
   Copyright (C) 2007 Urs Wolfer <uwolfer @ kde.org>
   Copyright (C) 2007 Michaël Larouche <larouche@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB. If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "ktitlewidget.h"

#include <QApplication>
#include <QtCore/QTimer>
#include <QMouseEvent>
#include <QFrame>
#include <QLabel>
#include <QLayout>
#include <QTextDocument>
#include <QIcon>
#include <QStyle>

class KTitleWidget::Private
{
public:
    Private(KTitleWidget *parent)
        : q(parent),
          autoHideTimeout(0),
          messageType(InfoMessage)
    {
    }

    QString textStyleSheet() const
    {
        const int fontSize = qRound(QApplication::font().pointSize() * 1.4);
        return QStringLiteral("QLabel { font-size: %1pt; color: %2 }").arg(QString::number(fontSize), q->palette().color(QPalette::WindowText).name());
    }

    QString commentStyleSheet() const
    {
        QString styleSheet;
        switch (messageType) {
        //FIXME: we need the usability color styles to implement different
        //       yet palette appropriate colours for the different use cases!
        //       also .. should we include an icon here,
        //       perhaps using the imageLabel?
        case InfoMessage:
        case WarningMessage:
        case ErrorMessage:
            styleSheet = QStringLiteral("QLabel { color: palette(%1); background: palette(%2); }").arg(q->palette().color(QPalette::HighlightedText).name()).arg(q->palette().color(QPalette::Highlight).name());
            break;
        case PlainMessage:
        default:
            break;
        }
        return styleSheet;
    }

    KTitleWidget *q;
    QGridLayout *headerLayout;
    QLabel *imageLabel;
    QLabel *textLabel;
    QLabel *commentLabel;
    int autoHideTimeout;
    MessageType messageType;

    /**
     * @brief Get the icon name from the icon type
     * @param type icon type from the enum
     * @return named icon as QString
     */
    QString iconTypeToIconName(KTitleWidget::MessageType type);

    void _k_timeoutFinished()
    {
        q->setVisible(false);
    }
};

QString KTitleWidget::Private::iconTypeToIconName(KTitleWidget::MessageType type)
{
    switch (type) {
    case KTitleWidget::InfoMessage:
        return QStringLiteral("dialog-information");
        break;
    case KTitleWidget::ErrorMessage:
        return QStringLiteral("dialog-error");
        break;
    case KTitleWidget::WarningMessage:
        return QStringLiteral("dialog-warning");
        break;
    case KTitleWidget::PlainMessage:
        break;
    }

    return QString();
}

KTitleWidget::KTitleWidget(QWidget *parent)
    : QWidget(parent),
      d(new Private(this))
{
    QFrame *titleFrame = new QFrame(this);
    titleFrame->setAutoFillBackground(true);
    titleFrame->setFrameShape(QFrame::StyledPanel);
    titleFrame->setFrameShadow(QFrame::Plain);
    titleFrame->setBackgroundRole(QPalette::Base);

    // default image / text part start
    d->headerLayout = new QGridLayout(titleFrame);
    d->headerLayout->setColumnStretch(0, 1);
    d->headerLayout->setMargin(6);

    d->textLabel = new QLabel(titleFrame);
    d->textLabel->setVisible(false);
    d->textLabel->setTextInteractionFlags(Qt::TextSelectableByMouse | Qt::LinksAccessibleByMouse);

    d->imageLabel = new QLabel(titleFrame);
    d->imageLabel->setVisible(false);

    d->headerLayout->addWidget(d->textLabel, 0, 0);
    d->headerLayout->addWidget(d->imageLabel, 0, 1, 1, 2);

    d->commentLabel = new QLabel(titleFrame);
    d->commentLabel->setVisible(false);
    d->commentLabel->setOpenExternalLinks(true);
    d->commentLabel->setWordWrap(true);
    d->commentLabel->setTextInteractionFlags(Qt::TextSelectableByMouse | Qt::LinksAccessibleByMouse);
    d->headerLayout->addWidget(d->commentLabel, 1, 0);

    // default image / text part end

    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(titleFrame);
    mainLayout->setMargin(0);
    setLayout(mainLayout);
}

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

bool KTitleWidget::eventFilter(QObject *object, QEvent *event)
{
    // Hide message label on click
    if (d->autoHideTimeout > 0 &&
            event->type() == QEvent::MouseButtonPress) {
        QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
        if (mouseEvent && mouseEvent->button() == Qt::LeftButton) {
            setVisible(false);
            return true;
        }
    }

    return QWidget::eventFilter(object, event);
}

void KTitleWidget::setWidget(QWidget *widget)
{
    d->headerLayout->addWidget(widget, 2, 0, 1, 2);
}

QString KTitleWidget::text() const
{
    return d->textLabel->text();
}

QString KTitleWidget::comment() const
{
    return d->commentLabel->text();
}

const QPixmap *KTitleWidget::pixmap() const
{
    return d->imageLabel->pixmap();
}

void KTitleWidget::setBuddy(QWidget *buddy)
{
    d->textLabel->setBuddy(buddy);
}

void KTitleWidget::changeEvent(QEvent *e)
{
    QWidget::changeEvent(e);
    if (e->type() == QEvent::PaletteChange || e->type() == QEvent::FontChange
                                           || e->type() == QEvent::ApplicationFontChange) {
        d->textLabel->setStyleSheet(d->textStyleSheet());
        d->commentLabel->setStyleSheet(d->commentStyleSheet());
    }
}

void KTitleWidget::setText(const QString &text, Qt::Alignment alignment)
{
    d->textLabel->setVisible(!text.isNull());

    if (!Qt::mightBeRichText(text)) {
        d->textLabel->setStyleSheet(d->textStyleSheet());
    }

    d->textLabel->setText(text);
    d->textLabel->setAlignment(alignment);
    show();
}

void KTitleWidget::setText(const QString &text, MessageType type)
{
    setPixmap(type);
    setText(text);
}

void KTitleWidget::setComment(const QString &comment, MessageType type)
{
    d->commentLabel->setVisible(!comment.isNull());

    //TODO: should we override the current icon with the corresponding MessageType icon?
    d->messageType = type;
    d->commentLabel->setStyleSheet(d->commentStyleSheet());
    d->commentLabel->setText(comment);
    show();
}

void KTitleWidget::setPixmap(const QPixmap &pixmap, ImageAlignment alignment)
{
    d->imageLabel->setVisible(!pixmap.isNull());

    d->headerLayout->removeWidget(d->textLabel);
    d->headerLayout->removeWidget(d->commentLabel);
    d->headerLayout->removeWidget(d->imageLabel);

    if (alignment == ImageLeft) {
        // swap the text and image labels around
        d->headerLayout->addWidget(d->imageLabel, 0, 0, 2, 1);
        d->headerLayout->addWidget(d->textLabel, 0, 1);
        d->headerLayout->addWidget(d->commentLabel, 1, 1);
        d->headerLayout->setColumnStretch(0, 0);
        d->headerLayout->setColumnStretch(1, 1);
    } else {
        d->headerLayout->addWidget(d->textLabel, 0, 0);
        d->headerLayout->addWidget(d->commentLabel, 1, 0);
        d->headerLayout->addWidget(d->imageLabel, 0, 1, 2, 1);
        d->headerLayout->setColumnStretch(1, 0);
        d->headerLayout->setColumnStretch(0, 1);
    }

    d->imageLabel->setPixmap(pixmap);
}

void KTitleWidget::setPixmap(const QString &icon, ImageAlignment alignment)
{
    setPixmap(QIcon::fromTheme(icon), alignment);
}

void KTitleWidget::setPixmap(const QIcon &icon, ImageAlignment alignment)
{
    setPixmap(icon.pixmap(style()->pixelMetric(QStyle::PM_MessageBoxIconSize)), alignment);
}

void KTitleWidget::setPixmap(MessageType type, ImageAlignment alignment)
{
    setPixmap(QIcon::fromTheme(d->iconTypeToIconName(type)), alignment);
}

int KTitleWidget::autoHideTimeout() const
{
    return d->autoHideTimeout;
}

void KTitleWidget::setAutoHideTimeout(int msecs)
{
    d->autoHideTimeout = msecs;

    if (msecs > 0) {
        installEventFilter(this);
    } else {
        removeEventFilter(this);
    }
}

void KTitleWidget::showEvent(QShowEvent *event)
{
    Q_UNUSED(event)
    if (d->autoHideTimeout > 0) {
        QTimer::singleShot(d->autoHideTimeout, this, SLOT(_k_timeoutFinished()));
    }
}

#include "moc_ktitlewidget.cpp"
