/*
 *   Copyright (C) 2001-2006 by Richard Moore <rich@kde.org>
 *   Copyright (C) 2004-2005 by Sascha Cunz <sascha.cunz@tiscali.de>
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Library General Public
 *   License as published by the Free Software Foundation; either
 *   version 2 of the License, or (at your option) any later version.
 *
 *   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,
 */

#include "kpassivepopup.h"

#include <config-knotifications.h>

// Qt
#include <QApplication>
#include <QBitmap>
#include <QDebug>
#include <QDesktopWidget>
#include <QLabel>
#include <QLayout>
#include <QBoxLayout>
#include <QMouseEvent>
#include <QPainter>
#include <QPainterPath>
#include <QDesktopWidget>
#include <QPolygonF>
#include <QStyle>
#include <QTimer>
#include <QToolTip>
#include <QSystemTrayIcon>

#if HAVE_X11
#include <QX11Info>
#include <netwm.h>
#endif

#include <kwindowinfo.h>

static const int DEFAULT_POPUP_TYPE = KPassivePopup::Boxed;
static const int DEFAULT_POPUP_TIME = 6 * 1000;
static const Qt::WindowFlags POPUP_FLAGS = Qt::Tool | Qt::X11BypassWindowManagerHint | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint;

class KPassivePopup::Private
{
public:
    Private(KPassivePopup *q, WId winId)
        : q(q),
          popupStyle(DEFAULT_POPUP_TYPE),
          window(winId),
          msgView(0),
          topLayout(0),
          hideDelay(DEFAULT_POPUP_TIME),
          hideTimer(new QTimer(q)),
          autoDelete(false)
    {
        q->setWindowFlags(POPUP_FLAGS);
        q->setFrameStyle(QFrame::Box | QFrame::Plain);
        q->setLineWidth(2);

        if (popupStyle == Boxed) {
            q->setFrameStyle(QFrame::Box | QFrame::Plain);
            q->setLineWidth(2);
        } else if (popupStyle == Balloon) {
            q->setPalette(QToolTip::palette());
        }
        connect(hideTimer, SIGNAL(timeout()), q, SLOT(hide()));
        connect(q, SIGNAL(clicked()), q, SLOT(hide()));
    }

    KPassivePopup *q;

    int popupStyle;
    QPolygon surround;
    QPoint anchor;
    QPoint fixedPosition;

    WId window;
    QWidget *msgView;
    QBoxLayout *topLayout;
    int hideDelay;
    QTimer *hideTimer;

    QLabel *ttlIcon;
    QLabel *ttl;
    QLabel *msg;

    bool autoDelete;

    /**
     * Updates the transparency mask. Unused if PopupStyle == Boxed
     */
    void updateMask()
    {
        // get screen-geometry for screen our anchor is on
        // (geometry can differ from screen to screen!
        QRect deskRect = QApplication::desktop()->screenGeometry(anchor);

        const int width = q->width();
        const int height = q->height();

        int xh = 70, xl = 40;
        if (width < 80) {
            xh = xl = 40;
        } else if (width < 110) {
            xh = width - 40;
        }

        bool bottom = (anchor.y() + height) > ((deskRect.y() + deskRect.height() - 48));
        bool right = (anchor.x() + width) > ((deskRect.x() + deskRect.width() - 48));

        QPoint corners[4] = {
            QPoint(width - 50, 10),
            QPoint(10, 10),
            QPoint(10, height - 50),
            QPoint(width - 50, height - 50)
        };

        QBitmap mask(width, height);
        mask.clear();
        QPainter p(&mask);
        QBrush brush(Qt::color1, Qt::SolidPattern);
        p.setBrush(brush);

        int i = 0, z = 0;
        for (; i < 4; ++i) {
            QPainterPath path;
            path.moveTo(corners[i].x(), corners[i].y());
            path.arcTo(corners[i].x(), corners[i].y(), 40, 40, i * 90, 90);
            QPolygon corner = path.toFillPolygon().toPolygon();

            surround.resize(z + corner.count() - 1);
            for (int s = 1; s < corner.count() - 1; s++, z++) {
                surround.setPoint(z, corner[s]);
            }

            if (bottom && i == 2) {
                if (right) {
                    surround.resize(z + 3);
                    surround.setPoint(z++, QPoint(width - xh, height - 10));
                    surround.setPoint(z++, QPoint(width - 20, height));
                    surround.setPoint(z++, QPoint(width - xl, height - 10));
                } else {
                    surround.resize(z + 3);
                    surround.setPoint(z++, QPoint(xl, height - 10));
                    surround.setPoint(z++, QPoint(20, height));
                    surround.setPoint(z++, QPoint(xh, height - 10));
                }
            } else if (!bottom && i == 0) {
                if (right) {
                    surround.resize(z + 3);
                    surround.setPoint(z++, QPoint(width - xl, 10));
                    surround.setPoint(z++, QPoint(width - 20, 0));
                    surround.setPoint(z++, QPoint(width - xh, 10));
                } else {
                    surround.resize(z + 3);
                    surround.setPoint(z++, QPoint(xh, 10));
                    surround.setPoint(z++, QPoint(20, 0));
                    surround.setPoint(z++, QPoint(xl, 10));
                }
            }
        }

        surround.resize(z + 1);
        surround.setPoint(z, surround[0]);
        p.drawPolygon(surround);
        q->setMask(mask);

        q->move(right ? anchor.x() - width + 20 : (anchor.x() < 11 ? 11 : anchor.x() - 20),
                bottom ? anchor.y() - height : (anchor.y() < 11 ? 11 : anchor.y()));

        q->update();
    }

    /**
     * Calculates the position to place the popup near the specified rectangle.
     */
    QPoint calculateNearbyPoint(const QRect &target)
    {
        QPoint pos = target.topLeft();
        int x = pos.x();
        int y = pos.y();
        int w = q->minimumSizeHint().width();
        int h = q->minimumSizeHint().height();

        QRect r = QApplication::desktop()->screenGeometry(QPoint(x + w / 2, y + h / 2));

        if (popupStyle == Balloon) {
            // find a point to anchor to
            if (x + w > r.width()) {
                x = x + target.width();
            }

            if (y + h > r.height()) {
                y = y + target.height();
            }
        } else {
            if (x < r.center().x()) {
                x = x + target.width();
            } else {
                x = x - w;
            }

            // It's apparently trying to go off screen, so display it ALL at the bottom.
            if ((y + h) > r.bottom()) {
                y = r.bottom() - h;
            }

            if ((x + w) > r.right()) {
                x = r.right() - w;
            }
        }
        if (y < r.top()) {
            y = r.top();
        }

        if (x < r.left()) {
            x = r.left();
        }

        return QPoint(x, y);
    }
};

KPassivePopup::KPassivePopup(QWidget *parent, Qt::WindowFlags f)
    : QFrame(0, f ? f : POPUP_FLAGS),
      d(new Private(this, parent ? parent->effectiveWinId() : 0L))
{
}

KPassivePopup::KPassivePopup(WId win)
    : QFrame(0),
      d(new Private(this, win))
{
}

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

void KPassivePopup::setPopupStyle(int popupstyle)
{
    if (d->popupStyle == popupstyle) {
        return;
    }

    d->popupStyle = popupstyle;
    if (d->popupStyle == Boxed) {
        setFrameStyle(QFrame::Box | QFrame::Plain);
        setLineWidth(2);
    } else if (d->popupStyle == Balloon) {
        setPalette(QToolTip::palette());
    }
}

void KPassivePopup::setView(QWidget *child)
{
    delete d->msgView;
    d->msgView = child;

    delete d->topLayout;
    d->topLayout = new QVBoxLayout(this);
    if (d->popupStyle == Balloon) {
        const int marginHint = style()->pixelMetric(QStyle::PM_DefaultChildMargin);
        d->topLayout->setMargin(2 * marginHint);
    }
    d->topLayout->addWidget(d->msgView);
    d->topLayout->activate();
}

void KPassivePopup::setView(const QString &caption, const QString &text,
                            const QPixmap &icon)
{
    // qDebug() << "KPassivePopup::setView " << caption << ", " << text;
    setView(standardView(caption, text, icon, this));
}

QWidget *KPassivePopup::standardView(const QString &caption,
                                     const QString &text,
                                     const QPixmap &icon,
                                     QWidget *parent)
{
    QWidget *top = new QWidget(parent ? parent : this);
    QVBoxLayout *vb = new QVBoxLayout(top);
    vb->setMargin(0);
    top->setLayout(vb);

    QHBoxLayout *hb = 0;
    if (!icon.isNull()) {
        hb = new QHBoxLayout(top);
        hb->setMargin(0);
        vb->addLayout(hb);
        d->ttlIcon = new QLabel(top);
        d->ttlIcon->setPixmap(icon);
        d->ttlIcon->setAlignment(Qt::AlignLeft);
        hb->addWidget(d->ttlIcon);
    }

    if (!caption.isEmpty()) {
        d->ttl = new QLabel(caption, top);
        QFont fnt = d->ttl->font();
        fnt.setBold(true);
        d->ttl->setFont(fnt);
        d->ttl->setAlignment(Qt::AlignHCenter);

        if (hb) {
            hb->addWidget(d->ttl);
            hb->setStretchFactor(d->ttl, 10);   // enforce centering
        } else {
            vb->addWidget(d->ttl);
        }
    }

    if (!text.isEmpty()) {
        d->msg = new QLabel(text, top);
        d->msg->setAlignment(Qt::AlignLeft);
        d->msg->setTextInteractionFlags(Qt::LinksAccessibleByMouse);
        d->msg->setOpenExternalLinks(true);
        vb->addWidget(d->msg);
    }

    return top;
}

void KPassivePopup::setView(const QString &caption, const QString &text)
{
    setView(caption, text, QPixmap());
}

QWidget *KPassivePopup::view() const
{
    return d->msgView;
}

int KPassivePopup::timeout() const
{
    return d->hideDelay;
}

void KPassivePopup::setTimeout(int delay)
{
    d->hideDelay = delay;
    if (d->hideTimer->isActive()) {
        if (delay) {
            d->hideTimer->start(delay);
        } else {
            d->hideTimer->stop();
        }
    }
}

bool KPassivePopup::autoDelete() const
{
    return d->autoDelete;
}

void KPassivePopup::setAutoDelete(bool autoDelete)
{
    d->autoDelete = autoDelete;
}

void KPassivePopup::mouseReleaseEvent(QMouseEvent *e)
{
    emit clicked();
    emit clicked(e->pos());
}

//
// Main Implementation
//

void KPassivePopup::setVisible(bool visible)
{
    if (! visible) {
        QFrame::setVisible(visible);
        return;
    }

    if (size() != sizeHint()) {
        resize(sizeHint());
    }

    if (d->fixedPosition.isNull()) {
        positionSelf();
    } else {
        if (d->popupStyle == Balloon) {
            setAnchor(d->fixedPosition);
        } else {
            move(d->fixedPosition);
        }
    }
    QFrame::setVisible(/*visible=*/ true);

    int delay = d->hideDelay;
    if (delay < 0) {
        delay = DEFAULT_POPUP_TIME;
    }

    if (delay > 0) {
        d->hideTimer->start(delay);
    }
}

void KPassivePopup::show(const QPoint &p)
{
    d->fixedPosition = p;
    show();
}

void KPassivePopup::hideEvent(QHideEvent *)
{
    d->hideTimer->stop();
    if (d->autoDelete) {
        deleteLater();
    }
}

QPoint KPassivePopup::defaultLocation() const
{
    const QRect r = QApplication::desktop()->availableGeometry();
    return QPoint(r.left(), r.top());
}

void KPassivePopup::positionSelf()
{
    QRect target;

    if (d->window) {
#if HAVE_X11
        if (QX11Info::isPlatformX11()) {
            NETWinInfo ni(QX11Info::connection(), d->window, QX11Info::appRootWindow(),
                          NET::WMIconGeometry | NET::WMState);

            // Try to put the popup by the taskbar entry
            if (!(ni.state() & NET::SkipTaskbar)) {
                NETRect r = ni.iconGeometry();
                target.setRect(r.pos.x, r.pos.y, r.size.width, r.size.height);
            }
        }
#endif
        // If that failed, put it by the window itself

        if (target.isNull()) {
            // Avoid making calls to the window system if we can
            QWidget *widget = QWidget::find(d->window);
            if (widget) {
                target = widget->geometry();
            }
        }
        if (target.isNull()) {
            KWindowInfo info(d->window, NET::WMGeometry);
            if (info.valid()) {
                target = info.geometry();
            }
        }
    }
    if (target.isNull()) {
        target = QRect(defaultLocation(), QSize(0, 0));
    }
    moveNear(target);
}

void KPassivePopup::moveNear(const QRect &target)
{
    QPoint pos = d->calculateNearbyPoint(target);
    if (d->popupStyle == Balloon) {
        setAnchor(pos);
    } else {
        move(pos.x(), pos.y());
    }
}

QPoint KPassivePopup::anchor() const
{
    return d->anchor;
}

void KPassivePopup::setAnchor(const QPoint &anchor)
{
    d->anchor = anchor;
    d->updateMask();
}

void KPassivePopup::paintEvent(QPaintEvent *pe)
{
    if (d->popupStyle == Balloon) {
        QPainter p;
        p.begin(this);
        p.drawPolygon(d->surround);
    } else {
        QFrame::paintEvent(pe);
    }
}

//
// Convenience Methods
//

KPassivePopup *KPassivePopup::message(const QString &caption, const QString &text,
                                      const QPixmap &icon, QWidget *parent, int timeout, const QPoint &p)
{
    return message(DEFAULT_POPUP_TYPE, caption, text, icon, parent, timeout, p);
}

KPassivePopup *KPassivePopup::message(const QString &text, QWidget *parent, const QPoint &p)
{
    return message(DEFAULT_POPUP_TYPE, QString(), text, QPixmap(), parent, -1, p);
}

KPassivePopup *KPassivePopup::message(const QString &caption, const QString &text,
                                      QWidget *parent, const QPoint &p)
{
    return message(DEFAULT_POPUP_TYPE, caption, text, QPixmap(), parent, -1, p);
}

KPassivePopup *KPassivePopup::message(const QString &caption, const QString &text,
                                      const QPixmap &icon, WId parent, int timeout, const QPoint &p)
{
    return message(DEFAULT_POPUP_TYPE, caption, text, icon, parent, timeout, p);
}

KPassivePopup *KPassivePopup::message(const QString &caption, const QString &text,
                                      const QPixmap &icon, QSystemTrayIcon *parent, int timeout)
{
    return message(DEFAULT_POPUP_TYPE, caption, text, icon, parent, timeout);
}

KPassivePopup *KPassivePopup::message(const QString &text, QSystemTrayIcon *parent)
{
    return message(DEFAULT_POPUP_TYPE, QString(), text, QPixmap(), parent);
}

KPassivePopup *KPassivePopup::message(const QString &caption, const QString &text,
                                      QSystemTrayIcon *parent)
{
    return message(DEFAULT_POPUP_TYPE, caption, text, QPixmap(), parent);
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &caption, const QString &text,
                                      const QPixmap &icon, QWidget *parent, int timeout, const QPoint &p)
{
    KPassivePopup *pop = new KPassivePopup(parent);
    pop->setPopupStyle(popupStyle);
    pop->setAutoDelete(true);
    pop->setView(caption, text, icon);
    pop->d->hideDelay = timeout;
    if (p.isNull()) {
        pop->show();
    } else {
        pop->show(p);
    }

    return pop;
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &text, QWidget *parent, const QPoint &p)
{
    return message(popupStyle, QString(), text, QPixmap(), parent, -1, p);
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &caption, const QString &text,
                                      QWidget *parent, const QPoint &p)
{
    return message(popupStyle, caption, text, QPixmap(), parent, -1, p);
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &caption, const QString &text,
                                      const QPixmap &icon, WId parent, int timeout, const QPoint &p)
{
    KPassivePopup *pop = new KPassivePopup(parent);
    pop->setPopupStyle(popupStyle);
    pop->setAutoDelete(true);
    pop->setView(caption, text, icon);
    pop->d->hideDelay = timeout;
    if (p.isNull()) {
        pop->show();
    } else {
        pop->show(p);
    }

    return pop;
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &caption, const QString &text,
                                      const QPixmap &icon, QSystemTrayIcon *parent, int timeout)
{
    KPassivePopup *pop = new KPassivePopup();
    pop->setPopupStyle(popupStyle);
    pop->setAutoDelete(true);
    pop->setView(caption, text, icon);
    pop->d->hideDelay = timeout;
    QPoint pos = pop->d->calculateNearbyPoint(parent->geometry());
    pop->show(pos);
    pop->moveNear(parent->geometry());

    return pop;
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &text, QSystemTrayIcon *parent)
{
    return message(popupStyle, QString(), text, QPixmap(), parent);
}

KPassivePopup *KPassivePopup::message(int popupStyle, const QString &caption, const QString &text,
                                      QSystemTrayIcon *parent)
{
    return message(popupStyle, caption, text, QPixmap(), parent);
}

// Local Variables:
// End:

