/***************************************************************************
 *   Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com>             *
 *                                                                         *
 *   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 "kitemlistroleeditor.h"

#include <KIO/Global>
#include <QKeyEvent>

KItemListRoleEditor::KItemListRoleEditor(QWidget *parent) :
    KTextEdit(parent),
    m_role(),
    m_blockFinishedSignal(false)
{
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setAcceptRichText(false);
    enableFindReplace(false);
    document()->setDocumentMargin(0);

    if (parent) {
        parent->installEventFilter(this);
    }

    connect(this, &KItemListRoleEditor::textChanged, this, &KItemListRoleEditor::autoAdjustSize);
}

KItemListRoleEditor::~KItemListRoleEditor()
{
}

void KItemListRoleEditor::setRole(const QByteArray& role)
{
    m_role = role;
}

QByteArray KItemListRoleEditor::role() const
{
    return m_role;
}

bool KItemListRoleEditor::eventFilter(QObject* watched, QEvent* event)
{
    if (watched == parentWidget() && event->type() == QEvent::Resize) {
        emitRoleEditingFinished();
    }

    return KTextEdit::eventFilter(watched, event);
}

bool KItemListRoleEditor::event(QEvent* event)
{
    if (event->type() == QEvent::FocusOut) {
        QFocusEvent* focusEvent = static_cast<QFocusEvent*>(event);
        if (focusEvent->reason() != Qt::PopupFocusReason) {
            emitRoleEditingFinished();
        }
    }
    return KTextEdit::event(event);
}

void KItemListRoleEditor::keyPressEvent(QKeyEvent* event)
{
    switch (event->key()) {
    case Qt::Key_Escape:
        // Emitting the signal roleEditingCanceled might result
        // in losing the focus. Per default losing the focus emits
        // a roleEditingFinished signal (see KItemListRoleEditor::event),
        // which is not wanted in this case.
        m_blockFinishedSignal = true;
        emit roleEditingCanceled(m_role, KIO::encodeFileName(toPlainText()));
        m_blockFinishedSignal = false;
        event->accept();
        return;
    case Qt::Key_Enter:
    case Qt::Key_Return:
        emitRoleEditingFinished();
        event->accept();
        return;
    case Qt::Key_Left:
    case Qt::Key_Right: {
        QTextCursor cursor = textCursor();
        if (event->modifiers() == Qt::NoModifier && cursor.hasSelection()) {
            if (event->key() == Qt::Key_Left) {
                cursor.setPosition(cursor.selectionStart());
            } else {
                cursor.setPosition(cursor.selectionEnd());
            }
            cursor.clearSelection();
            setTextCursor(cursor);
            event->accept();
            return;
        }
        break;
    }
    default:
        break;
    }

    KTextEdit::keyPressEvent(event);
}

void KItemListRoleEditor::autoAdjustSize()
{
    const qreal frameBorder = 2 * frameWidth();

    const qreal requiredWidth = document()->size().width();
    const qreal availableWidth = size().width() - frameBorder;
    if (requiredWidth > availableWidth) {
        qreal newWidth = requiredWidth + frameBorder;
        if (parentWidget() && pos().x() + newWidth > parentWidget()->width()) {
            newWidth = parentWidget()->width() - pos().x();
        }
        resize(newWidth, size().height());
    }

    const qreal requiredHeight = document()->size().height();
    const qreal availableHeight = size().height() - frameBorder;
    if (requiredHeight > availableHeight) {
        qreal newHeight = requiredHeight + frameBorder;
        if (parentWidget() && pos().y() + newHeight > parentWidget()->height()) {
            newHeight = parentWidget()->height() - pos().y();
        }
        resize(size().width(), newHeight);
    }
}

void KItemListRoleEditor::emitRoleEditingFinished()
{
    if (!m_blockFinishedSignal) {
        emit roleEditingFinished(m_role, KIO::encodeFileName(toPlainText()));
    }
}

