/*
 *  Copyright (C) 2003 by Unai Garro <ugarro@users.sourceforge.net>
 *  Copyright (C) 2004 by Enrico Ros <rosenric@dei.unipd.it>
 *  Copyright (C) 2004 by Stephan Kulow <coolo@kde.org>
 *  Copyright (C) 2004 by Oswald Buddenhagen <ossi@kde.org>
 *
 *  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 General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "kdmlabel.h"

#include <config-workspace.h>
#include <config-kdm.h>

#include "kdmthemer.h"

#include <kglobal.h>
#include <klocale.h>
#include <kmacroexpander.h>

#include <QAction>
#include <QDateTime>
#include <QFontMetrics>
#include <QHash>
#include <QPainter>
#include <QTimer>
#include <QX11Info>

#include <X11/Xlib.h>

#include <unistd.h>
#include <sys/utsname.h>
#if !defined(HAVE_GETDOMAINNAME) && defined(HAVE_SYS_SYSTEMINFO)
# include <sys/systeminfo.h>
#endif

KdmLabel::KdmLabel(QObject *parent, const QDomNode &node)
    : KdmItem(parent, node)
    , action(0)
{
    itemType = "label";
    if (!isVisible())
        return;

    // Set default values for label (note: strings are already Null)
    label.normal.font = label.active.font = label.prelight.font = style.font;
    label.normal.color = label.active.color = label.prelight.color =
        style.palette.isBrushSet(QPalette::Normal, QPalette::WindowText) ?
            style.palette.color(QPalette::Normal, QPalette::WindowText) :
            QColor(Qt::white);
    label.active.present = false;
    label.prelight.present = false;

    const QString locale = KGlobal::locale()->language();

    // Read LABEL TAGS
    QDomNodeList childList = node.childNodes();
    bool stockUsed = false;
    for (int nod = 0; nod < childList.count(); nod++) {
        QDomNode child = childList.item(nod);
        QDomElement el = child.toElement();
        QString tagName = el.tagName();

        if (tagName == "normal") {
            parseColor(el, label.normal.color);
            parseFont(el, label.normal.font);
        } else if (tagName == "active") {
            label.active.present = true;
            parseColor(el, label.active.color);
            parseFont(el, label.active.font);
        } else if (tagName == "prelight") {
            label.prelight.present = true;
            parseColor(el, label.prelight.color);
            parseFont(el, label.prelight.font);
        } else if (tagName == "text" && el.attributes().count() == 0 && !stockUsed) {
            label.text = el.text();
        } else if (tagName == "text" && !stockUsed) {
            QString lang = el.attribute("xml:lang", "");
            if (lang == locale)
                label.text = el.text();
        } else if (tagName == "stock") {
            label.text = lookupStock(el.attribute("type", ""));
            stockUsed = true;
        }
    }

    label.isTimer = label.text.indexOf("%c") >= 0;
    if (label.isTimer) {
        timer = new QTimer(this);
        timer->start(1000);
        connect(timer, SIGNAL(timeout()), SLOT(update()));
    }

    zeroWidth = QFontMetrics(label.normal.font.font).width('0');

    label.text.replace('\n', ' ');
    setCText(lookupText(label.text));
}

void
KdmLabel::setText(const QString &txt)
{
    label.text = txt;
    label.text.replace('\n', ' ');
    update();
}

void
KdmLabel::setCText(const QString &txt)
{
    delete action;
    action = 0;
    pText = cText = txt;
    pAccelOff = txt.indexOf('_');
    if (pAccelOff >= 0) {
        action = new QAction(this);
        action->setShortcut(Qt::ALT + txt[pAccelOff + 1].unicode());
        connect(action, SIGNAL(triggered(bool)), SLOT(activate()));
        emit needPlugging();
        pText.remove(pAccelOff, 1);
    }
    QRect bbox = QFontMetrics(label.normal.font.font).boundingRect(pText);
    QSize newSize = bbox.size();
    if (newSize.width() > pTextSize.width() ||
        (newSize.width() < (pTextSize.width() - zeroWidth)))
    {
        if (label.isTimer)
            newSize.rwidth() += zeroWidth;
        pTextSize = newSize;
        emit needPlacement();
    }
    pTextIndent = bbox.left();
}

void
KdmLabel::activate()
{
    KdmItem *cp = this;
    do {
        if (cp->isButton) {
            emit activated(cp->objectName());
            return;
        }
        cp = qobject_cast<KdmItem *>(cp->parent());
    } while (cp);
    if (!buddy.isEmpty())
        activateBuddy();
}

void
KdmLabel::doPlugActions(bool plug)
{
    if (action) {
        QWidget *w = themer()->widget();
        if (plug)
            w->addAction(action);
        else
            w->removeAction(action);
    }
}

QSize
KdmLabel::sizeHint()
{
    return pTextSize;
}

void
KdmLabel::drawContents(QPainter *p, const QRect &r)
{
    // choose the correct label class
    struct LabelStruct::LabelClass *l = &label.normal;
    if (state == Sactive && label.active.present)
        l = &label.active;
    else if (state == Sprelight && label.prelight.present)
        l = &label.prelight;
    // draw the label
    p->setFont(l->font.font);
    p->setPen(l->color);
    p->setClipRect(r);
    if (pAccelOff != -1) {
        QRect tarea(area);
        tarea.setLeft(tarea.left() - pTextIndent);
        QFontMetrics fm(l->font.font);
        QString left = pText.left(pAccelOff);
        p->drawText(area, 0, left);
        tarea.setLeft(tarea.left() + fm.width(left));
        QFont f(l->font.font);
        f.setUnderline(true);
        p->setFont(f);
        QString acc(pText[pAccelOff]);
        p->drawText(tarea, 0, acc);
        tarea.setLeft(tarea.left() + fm.width(acc));
        p->setFont(l->font.font);
        p->drawText(tarea, 0, pText.mid(pAccelOff + 1));
    } else {
        p->drawText(area, 0, cText);
    }
    p->setClipping(false);
}

void
KdmLabel::statusChanged(bool descend)
{
    KdmItem::statusChanged(descend);
    if (!label.active.present && !label.prelight.present)
        return;
    if ((state == Sprelight && !label.prelight.present) ||
        (state == Sactive && !label.active.present))
        return;
    updateWidgetAttribs();
    needUpdate();
}

void
KdmLabel::update()
{
    KdmItem::update();
    QString text = lookupText(label.text);
    if (text != cText) {
        setCText(text);
        needUpdate();
    }
}

#undef I18N_NOOP
#define I18N_NOOP(t) 0, t
#undef I18N_NOOP2
#define I18N_NOOP2(c,t) c, t

static const struct {
    const char *type, *comment, *text;
} stocks[] = {
    { "language",          I18N_NOOP2("@action:button", "Lan_guage") },
    { "session",           I18N_NOOP2("@action:button", "Session _Type") },
    { "system",            I18N_NOOP2("@action:button", "_Menu") }, // i18n("Actions");
    { "disconnect",        I18N_NOOP2("@action:button ... from XDMCP server", "Disconn_ect") },
    { "quit",              I18N_NOOP2("@action:button", "_Quit") },
    { "halt",              I18N_NOOP2("@action:button", "Power o_ff") },
//    { "suspend",           I18N_NOOP2("@action:button", "_Suspend") },
    { "reboot",            I18N_NOOP2("@action:button", "Re_boot") },
    { "chooser",           I18N_NOOP2("@action:button", "_Remote login") },
    { "caps-lock-warning", I18N_NOOP("Caps Lock is enabled") },
    { "timed-label",       I18N_NOOP("User %u will log in in %t") },
    { "welcome-label",     I18N_NOOP("Welcome to %h") }, // _greetString
    { "domain-label",      I18N_NOOP("_Domain:") },
    { "username-label",    I18N_NOOP("_Username:") },
    { "password-label",    I18N_NOOP("_Password:") },
    { "login",             I18N_NOOP2("@action:button", "_Login") }
};

// public static
QString
KdmLabel::lookupStock(const QString &stock)
{
    QString type(stock.toLower());

    for (uint i = 0; i < sizeof(stocks) / sizeof(stocks[0]); i++)
        if (type == stocks[i].type) {
            if (stocks[i].comment)
                return i18nc(stocks[i].comment, stocks[i].text);
            else
                return i18n(stocks[i].text);
        }

    kWarning() << "Invalid <stock> element '" << stock << "'. Check your theme!";
    return stock;
}

QString KdmLabel::timedUser = QString();
int KdmLabel::timedDelay = -1;
QHash<QChar, QString> KdmLabel::expandoMap;
bool KdmLabel::dateFormatSet = false;

bool
KdmLabel::expandMacro(QChar chr, QStringList &ret)
{
    switch (chr.unicode()) {
    case 't':
        ret << i18ncp("will login in ...", "1 second", "%1 seconds", timedDelay);
        return true;
    case 'u':
        ret << timedUser;
        return true;
    case 'c':
        if (!dateFormatSet) {
            // xgettext:no-c-format
            KGlobal::locale()->setDateFormat(i18nc("date format", "%a %d %B"));
            dateFormatSet = true;
        }
        ret << KGlobal::locale()->formatDateTime(QDateTime::currentDateTime(), KLocale::LongDate);
        return true;
    }

    if (expandoMap.isEmpty()) {
        struct utsname uts;
        uname(&uts);
        expandoMap['d'] = QString::fromLocal8Bit(DisplayString(QX11Info::display()));
        expandoMap['n'] = QString::fromLocal8Bit(uts.nodename);
        expandoMap['s'] = QString::fromLocal8Bit(uts.sysname);
        expandoMap['r'] = QString::fromLocal8Bit(uts.release);
        expandoMap['m'] = QString::fromLocal8Bit(uts.machine);
        char buf[256];
        buf[sizeof(buf) - 1] = '\0';
        expandoMap['h'] = gethostname(buf, sizeof(buf) - 1) ? "localhost" : QString::fromLocal8Bit(buf);
#ifdef HAVE_GETDOMAINNAME
        expandoMap['o'] = getdomainname(buf, sizeof(buf) - 1) ? "localdomain" : QString::fromLocal8Bit(buf);
#elif defined(HAVE_SYS_SYSTEMINFO)
        expandoMap['o'] = (unsigned)sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf)) > sizeof(buf) ? "localdomain" : QString::fromLocal8Bit(buf);
#endif
    }
    QHash<QChar, QString>::const_iterator mi = expandoMap.constFind(chr);
    if (mi != expandoMap.constEnd()) {
        ret << mi.value();
        return true;
    }

    return false;
}

QString
KdmLabel::lookupText(const QString &t)
{
    QString text = t;
    expandMacros(text);
    return text;
}

void
KdmLabel::setWidget(QWidget *widget)
{
    KdmItem::setWidget(widget);
    updateWidgetAttribs();
}

void
KdmLabel::updateWidgetAttribs()
{
    if (!myWidget)
        return;
    struct LabelStruct::LabelClass *l = &label.normal;
    if (state == Sactive && label.active.present)
        l = &label.active;
    else if (state == Sprelight && label.prelight.present)
        l = &label.prelight;
    myWidget->setFont(l->font.font);
    QPalette p;
    p.setColor(QPalette::WindowText, l->color);
    myWidget->setPalette(p);
}

#include "kdmlabel.moc"
