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/*
 * Copyright (c) 2010-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swift/QtUI/Roster/DelegateCommons.h>

#include <QColor>
#include <QFileInfo>

#include <Swift/QtUI/QtScaledAvatarCache.h>

namespace Swift {

void DelegateCommons::drawElidedText(QPainter* painter, const QRect& region, const QString& text, int flags) {
    QString adjustedText(painter->fontMetrics().elidedText(text, Qt::ElideRight, region.width(), Qt::TextShowMnemonic));
    painter->setClipRect(region);
    painter->drawText(region, flags, adjustedText.simplified());
    painter->setClipping(false);
}

void DelegateCommons::paintContact(QPainter* painter, const QStyleOptionViewItem& option, const QColor& nameColor, const QString& avatarPath, const QIcon& presenceIcon, const QString& name, const QString& statusText, bool isIdle, int unreadCount, bool compact) const {
    painter->save();
    QRect fullRegion(option.rect);
    QPen secondLineColor;
    if ( option.state & QStyle::State_Selected ) {
        painter->fillRect(fullRegion, option.palette.highlight());
        painter->setPen(option.palette.highlightedText().color());
        secondLineColor = painter->pen().color().darker(125);
    } else {
        painter->setPen(QPen(nameColor));
        secondLineColor = painter->pen().color().lighter();
    }

    QRect presenceIconRegion(QPoint(farLeftMargin, fullRegion.top()), QSize(presenceIconWidth, fullRegion.height() - verticalMargin));

    QRect idleIconRegion(QPoint(farLeftMargin, fullRegion.top()), QSize(presenceIconWidth*2, fullRegion.height() - verticalMargin));
    int calculatedAvatarSize = presenceIconRegion.height();
    //This overlaps the presenceIcon, so must be painted first
    QRect avatarRegion(QPoint(presenceIconRegion.right() - presenceIconWidth / 2, presenceIconRegion.top()), QSize(calculatedAvatarSize, calculatedAvatarSize));

    QPixmap avatarPixmap;
    if (!compact && !avatarPath.isEmpty()) {
        QString scaledAvatarPath = QtScaledAvatarCache(avatarRegion.height()).getScaledAvatarPath(avatarPath);
        if (QFileInfo(scaledAvatarPath).exists()) {
            avatarPixmap.load(scaledAvatarPath);
        }
    }
    if (!compact && avatarPixmap.isNull()) {
        avatarPixmap = QPixmap(":/icons/avatar.svg").scaled(avatarRegion.height(), avatarRegion.width(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    }

    if (!compact) {
        painter->drawPixmap(avatarRegion.topLeft() + QPoint(((avatarRegion.width() - avatarPixmap.width()) / 2), (avatarRegion.height() - avatarPixmap.height()) / 2), avatarPixmap);
    }

    //Paint the presence icon over the top of the avatar
    presenceIcon.paint(painter, presenceIconRegion, Qt::AlignBottom | Qt::AlignHCenter);

    if (isIdle) {
        idleIcon.paint(painter, idleIconRegion, Qt::AlignBottom | Qt::AlignHCenter);
    }

    QFontMetrics nameMetrics(nameFont);
    painter->setFont(nameFont);
    int extraFontWidth = nameMetrics.width("H");
    int leftOffset = (compact ? presenceIconRegion : avatarRegion).right() + horizontalMargin * 2 + extraFontWidth / 2;
    QRect textRegion(fullRegion.adjusted(leftOffset, 0, 0/*-leftOffset*/, 0));

    int nameHeight = nameMetrics.height() + verticalMargin;
    QRect nameRegion(textRegion.adjusted(0, verticalMargin, 0, 0));

    DelegateCommons::drawElidedText(painter, nameRegion, name);

    if (!compact) {
        painter->setFont(detailFont);
        painter->setPen(QPen(secondLineColor));

        QRect statusTextRegion(textRegion.adjusted(0, nameHeight, 0, 0));
        DelegateCommons::drawElidedText(painter, statusTextRegion, statusText);
    }

    if (unreadCount > 0) {
        QRect unreadRect(fullRegion.right() - unreadCountSize - horizontalMargin, fullRegion.top() + (fullRegion.height() - unreadCountSize) / 2, unreadCountSize, unreadCountSize);
        QPen pen(QColor("black"));
        pen.setWidth(1);
        painter->setRenderHint(QPainter::Antialiasing, true);
        painter->setPen(pen);
        painter->setBrush(QBrush(QColor("red"), Qt::SolidPattern));
        //painter->setBackgroundMode(Qt::OpaqueMode);
        painter->drawEllipse(unreadRect);
        painter->setBackgroundMode(Qt::TransparentMode);
        painter->setPen(QColor("white"));
        drawElidedText(painter, unreadRect, QString("%1").arg(unreadCount), Qt::AlignCenter);
    }

    painter->restore();
}

QSize DelegateCommons::contactSizeHint(const QStyleOptionViewItem& /*option*/, const QModelIndex& /*index*/, bool compact ) const {
    int heightByAvatar = (compact ? presenceIconHeight : avatarSize) + verticalMargin * 2;
    QFontMetrics nameMetrics(nameFont);
    QFontMetrics statusMetrics(detailFont);
    int sizeByText = 2 * verticalMargin + nameMetrics.height() + (compact ? 0 : statusMetrics.height());
    //Doesn't work, yay! FIXME: why?
    //QSize size = (option.state & QStyle::State_Selected) ? QSize(150, 80) : QSize(150, avatarSize_ + margin_ * 2);
    //qDebug() << "Returning size" << size;
    return QSize(150, sizeByText > heightByAvatar ? sizeByText : heightByAvatar);
}

const int DelegateCommons::horizontalMargin = 2;
const int DelegateCommons::verticalMargin = 2;
const int DelegateCommons::farLeftMargin = 2;
const int DelegateCommons::avatarSize = 20;
const int DelegateCommons::presenceIconHeight = 16;
const int DelegateCommons::presenceIconWidth = 16;
const int DelegateCommons::unreadCountSize = 16;



}