/*
  Copyright (C) 1997-1998 Thomas Tanghus (tanghus@earthling.net)

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This program 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
  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 "kdm-dlg.h"

#include "positioner.h"

#include <KDialog>
#include <KFileDialog>
#include <KIconLoader>
#include <KImageFilePreview>
#include <KImageIO>
#include <KLineEdit>
#include <KLocale>
#include <KMessageBox>
#include <KConfig>
#include <KConfigGroup>
#include <KStandardDirs>
#include <KIO/NetAccess>

#include <QButtonGroup>
#include <QDragEnterEvent>
#include <QEvent>
#include <QLabel>
#include <QPushButton>
#include <QRadioButton>
#include <QStyle>
#include <QGridLayout>
#include <QHBoxLayout>
#include <QVBoxLayout>

extern KConfig *config;

KDMDialogWidget::KDMDialogWidget(QWidget *parent)
    : QWidget(parent)
{
    QString wtstr;

    QGridLayout *grid = new QGridLayout(this);
    grid->setMargin(KDialog::marginHint());
    grid->setSpacing(KDialog::spacingHint());
    grid->setColumnStretch(1, 1);

    QHBoxLayout *hlay = new QHBoxLayout();
    hlay->setSpacing(KDialog::spacingHint());
    grid->addLayout(hlay, 0, 0, 1, 2);
    greetstr_lined = new KLineEdit(this);
    QLabel *label = new QLabel(i18n("&Greeting:"), this);
    label->setBuddy(greetstr_lined);
    hlay->addWidget(label);
    connect(greetstr_lined, SIGNAL(textChanged(QString)),
            SIGNAL(changed()));
    hlay->addWidget(greetstr_lined);
    wtstr = i18n(
        "<p>This is the \"headline\" for KDM's login window. You may want to "
        "put some nice greeting or information about the operating system here.</p>"
        "<p>KDM will substitute the following character pairs with the "
        "respective contents:</p>"
        "<ul>"
        "<li>%d -> current display</li>"
        "<li>%h -> host name, possibly with domain name</li>"
        "<li>%n -> node name, most probably the host name without domain name</li>"
        "<li>%s -> the operating system</li>"
        "<li>%r -> the operating system's version</li>"
        "<li>%m -> the machine (hardware) type</li>"
        "<li>%% -> a single %</li>"
        "</ul>");
    label->setWhatsThis(wtstr);
    greetstr_lined->setWhatsThis(wtstr);


    QGridLayout *hglay = new QGridLayout();
    hglay->setSpacing(KDialog::spacingHint());
    grid->addLayout(hglay, 1, 0);

    label = new QLabel(i18n("Logo area:"), this);
    hglay->addWidget(label, 0, 0);
    QVBoxLayout *vlay = new QVBoxLayout();
    vlay->setSpacing(KDialog::spacingHint());
    hglay->addLayout(vlay, 0, 1, 1, 2);
    noneRadio = new QRadioButton(i18nc("logo area", "&None"), this);
    clockRadio = new QRadioButton(i18n("Show cloc&k"), this);
    logoRadio = new QRadioButton(i18n("Sho&w logo"), this);
    QButtonGroup *buttonGroup = new QButtonGroup(this);
    connect(buttonGroup, SIGNAL(buttonClicked(int)),
            SLOT(slotAreaRadioClicked(int)));
    connect(buttonGroup, SIGNAL(buttonClicked(int)), SIGNAL(changed()));
    buttonGroup->addButton(noneRadio, KdmNone);
    buttonGroup->addButton(clockRadio, KdmClock);
    buttonGroup->addButton(logoRadio, KdmLogo);
    vlay->addWidget(noneRadio);
    vlay->addWidget(clockRadio);
    vlay->addWidget(logoRadio);
    wtstr = i18n("You can choose to display a custom logo (see below), a clock or no logo at all.");
    label->setWhatsThis(wtstr);
    noneRadio->setWhatsThis(wtstr);
    logoRadio->setWhatsThis(wtstr);
    clockRadio->setWhatsThis(wtstr);

    logoLabel = new QLabel(i18n("&Logo:"), this);
    logobutton = new QPushButton(this);
    logoLabel->setBuddy(logobutton);
    logobutton->setAutoDefault(false);
    logobutton->setAcceptDrops(true);
    logobutton->installEventFilter(this); // for drag and drop
    connect(logobutton, SIGNAL(clicked()), SLOT(slotLogoButtonClicked()));
    hglay->addWidget(logoLabel, 1, 0, Qt::AlignVCenter);
    hglay->addWidget(logobutton, 1, 1, Qt::AlignCenter);
    hglay->setRowMinimumHeight(1, 110);
    wtstr = i18n(
        "Click here to choose an image that KDM will display. "
        "You can also drag and drop an image onto this button "
        "(e.g. from Konqueror).");
    logoLabel->setWhatsThis(wtstr);
    logobutton->setWhatsThis(wtstr);


    vlay = new QVBoxLayout();
    grid->addLayout(vlay, 1, 1, 2, 1);
    vlay->setParent(grid);

    label = new QLabel(i18n("Dialog &position:"), this);
    vlay->addWidget(label);
    positioner = new Positioner(this);
    label->setBuddy(positioner);
    connect(positioner, SIGNAL(positionChanged()), SIGNAL(changed()));
    vlay->addWidget(positioner);

    grid->setRowStretch(3, 1);

}

bool KDMDialogWidget::setLogo(const QString &logo)
{
    QString flogo = logo.isEmpty() ?
        KStandardDirs::locate("data", QLatin1String("kdm/pics/kdelogo.png")) :
        logo;
    QImage p(flogo);
    if (p.isNull())
        return false;
    if (p.width() > 100 || p.height() > 100)
        p = p.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    logobutton->setIcon(QPixmap::fromImage(p));
    uint bd = style()->pixelMetric(QStyle::PM_ButtonMargin) * 2;
    logobutton->setFixedSize(p.width() + bd, p.height() + bd);
    logopath = logo;
    return true;
}

void KDMDialogWidget::slotLogoButtonClicked()
{
    KFileDialog dialog(KStandardDirs::locate("data", QLatin1String("kdm/pics/")),
                       KImageIO::pattern(KImageIO::Reading),
                       this);
    dialog.setOperationMode(KFileDialog::Opening);
    dialog.setMode(KFile::File | KFile::LocalOnly);

    KImageFilePreview *imagePreview = new KImageFilePreview(&dialog);
    dialog.setPreviewWidget(imagePreview);
    if (dialog.exec() == QDialog::Accepted &&
            setLogo(dialog.selectedFile()))
        changed();
}


void KDMDialogWidget::slotAreaRadioClicked(int id)
{
    logobutton->setEnabled(id == KdmLogo);
    logoLabel->setEnabled(id == KdmLogo);
}


bool KDMDialogWidget::eventFilter(QObject *, QEvent *e)
{
    if (e->type() == QEvent::DragEnter) {
        iconLoaderDragEnterEvent((QDragEnterEvent *)e);
        return true;
    }

    if (e->type() == QEvent::Drop) {
        iconLoaderDropEvent((QDropEvent *)e);
        return true;
    }

    return false;
}

void KDMDialogWidget::iconLoaderDragEnterEvent(QDragEnterEvent *e)
{
    e->setAccepted(KUrl::List::canDecode(e->mimeData()));
}


KUrl *decodeImgDrop(QDropEvent *e, QWidget *wdg);

void KDMDialogWidget::iconLoaderDropEvent(QDropEvent *e)
{
    // Installation of a logo from a non-local file is not
    // such a prominent feature to introduce a new KAuth action
    // for it. So let us just ignore these drops.

    KUrl *url = decodeImgDrop(e, this);
    if (url && url->isLocalFile()) {
        if (!setLogo(url->toLocalFile())) {
            QString msg = i18n("There was an error loading the image:\n"
                               "%1\n"
                               "It will not be saved.",
                               url->toLocalFile());
            KMessageBox::sorry(this, msg);
        } else {
            changed();
        }
    }
    delete url;
}


void KDMDialogWidget::save()
{
    KConfigGroup configGrp = config->group("X-*-Greeter");

    configGrp.writeEntry("GreetString", greetstr_lined->text());

    configGrp.writeEntry("LogoArea", noneRadio->isChecked() ? "None" :
                         logoRadio->isChecked() ? "Logo" : "Clock");

    configGrp.writeEntry("LogoPixmap",
        KIconLoader::global()->iconPath(logopath, KIconLoader::Desktop, true));

    configGrp.writeEntry("GreeterPos",
        QString("%1,%2").arg(positioner->x()).arg(positioner->y()));
}


void KDMDialogWidget::load()
{
    KConfigGroup configGrp = config->group("X-*-Greeter");

    // Read the greeting string
    greetstr_lined->setText(configGrp.readEntry("GreetString",
                                                i18n("Welcome to %s at %n")));

    // Regular logo or clock
    QString logoArea = configGrp.readEntry("LogoArea", "Logo");
    if (logoArea == "Clock") {
        clockRadio->setChecked(true);
        slotAreaRadioClicked(KdmClock);
    } else if (logoArea == "Logo") {
        logoRadio->setChecked(true);
        slotAreaRadioClicked(KdmLogo);
    } else {
        noneRadio->setChecked(true);
        slotAreaRadioClicked(KdmNone);
    }

    // See if we use alternate logo
    setLogo(configGrp.readEntry("LogoPixmap"));

    QStringList sl = configGrp.readEntry("GreeterPos", QStringList());
    if (sl.count() != 2)
        positioner->setPosition(50, 50);
    else
        positioner->setPosition(sl.first().toInt(), sl.last().toInt());
}


void KDMDialogWidget::defaults()
{
    greetstr_lined->setText(i18n("Welcome to %s at %n"));
    logoRadio->setChecked(true);
    slotAreaRadioClicked(KdmLogo);
    setLogo("");
    positioner->setPosition(50, 50);
}

QString KDMDialogWidget::quickHelp() const
{
    return i18n(
        "<h1>KDM - Dialog</h1> Here you can configure the basic appearance of "
        "the KDM login manager in dialog mode, i.e. a greeting string, an icon etc.");
}

#include "kdm-dlg.moc"