/* This file is part of the KDE libraries
   Copyright (C) 2002-2005 Hamish Rodda <rodda@kde.org>
   Copyright (C) 2003      Anakim Border <aborder@sources.sourceforge.net>
 *
 *  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,
 *  Boston, MA 02110-1301, USA.
 */

#include "katetextlayout.h"

#include "katepartdebug.h"

KateTextLayout::KateTextLayout(KateLineLayoutPtr line, int viewLine)
    : m_lineLayout(line)
    , m_viewLine(viewLine)
    , m_startX(m_viewLine ? -1 : 0)
{
    if (isValid()) {
        m_textLayout = m_lineLayout->layout()->lineAt(m_viewLine);
    }
}

bool KateTextLayout::isDirty() const
{
    if (!isValid()) {
        return m_invalidDirty;
    }

    return m_lineLayout->isDirty(viewLine());
}

bool KateTextLayout::setDirty(bool dirty)
{
    if (!isValid()) {
        return (m_invalidDirty = dirty);
    }

    return m_lineLayout->setDirty(viewLine(), dirty);
}

bool KateTextLayout::includesCursor(const KTextEditor::Cursor &realCursor) const
{
    return realCursor.line() == line() && realCursor.column() >= startCol() && (!wrap() || realCursor.column() < endCol());
}

int KateTextLayout::xOffset() const
{
    if (!isValid()) {
        return 0;
    }

    return startX() ? m_lineLayout->shiftX() : 0;
}

void KateTextLayout::debugOutput() const
{
    qCDebug(LOG_KTE) << "KateTextLayout: " << m_lineLayout << " valid " << isValid() << " line " << m_lineLayout->line() << " (" << line() << ") cols [" << startCol() << " -> " << endCol() << "] x [" << startX() << " -> " << endX() << " off " << m_lineLayout->shiftX() << "] wrap " << wrap();
}

bool operator> (const KateTextLayout &r, const KTextEditor::Cursor &c)
{
    return r.line() > c.line() || r.endCol() > c.column();
}

bool operator>= (const KateTextLayout &r, const KTextEditor::Cursor &c)
{
    return r.line() > c.line() || r.endCol() >= c.column();
}

bool operator< (const KateTextLayout &r, const KTextEditor::Cursor &c)
{
    return r.line() < c.line() || r.startCol() < c.column();
}

bool operator<= (const KateTextLayout &r, const KTextEditor::Cursor &c)
{
    return r.line() < c.line() || r.startCol() <= c.column();
}

bool KateTextLayout::isValid() const
{
    return m_lineLayout && m_lineLayout->isValid() && m_viewLine >= 0 && m_viewLine < m_lineLayout->viewLineCount();
}

int KateTextLayout::line() const
{
    if (!isValid()) {
        return -1;
    }

    return m_lineLayout->line();
}

int KateTextLayout::virtualLine() const
{
    if (!isValid()) {
        return -1;
    }

    return m_lineLayout->virtualLine();
}

int KateTextLayout::viewLine() const
{
    if (!isValid()) {
        return 0;
    }

    return m_viewLine;
}

const QTextLine &KateTextLayout::lineLayout() const
{
    return m_textLayout;
}

KateLineLayoutPtr KateTextLayout::kateLineLayout() const
{
    return m_lineLayout;
}

int KateTextLayout::startCol() const
{
    if (!isValid()) {
        return 0;
    }

    return lineLayout().textStart();
}

KTextEditor::Cursor KateTextLayout::start() const
{
    return KTextEditor::Cursor(line(), startCol());
}

int KateTextLayout::endCol(bool indicateEOL) const
{
    if (!isValid()) {
        return 0;
    }

    if (indicateEOL)
        if (viewLine() == kateLineLayout()->viewLineCount() - 1) {
            return -1;
        }

    return startCol() + m_textLayout.textLength();
}

KTextEditor::Cursor KateTextLayout::end(bool indicateEOL) const
{
    return KTextEditor::Cursor(line(), endCol(indicateEOL));
}

int KateTextLayout::length() const
{
    if (!isValid()) {
        return 0;
    }

    return m_textLayout.textLength();
}

bool KateTextLayout::isEmpty() const
{
    if (!isValid()) {
        return true;
    }

    return startCol() == 0 && endCol() == 0;
}

bool KateTextLayout::wrap() const
{
    if (!isValid()) {
        return false;
    }

    return viewLine() < m_lineLayout->viewLineCount() - 1;
}

int KateTextLayout::startX() const
{
    if (!isValid()) {
        return 0;
    }

    if (m_startX == -1)
        // viewLine is already > 0, from the constructor
        for (int i = 0; i < viewLine(); ++i) {
            m_startX += (int)m_lineLayout->layout()->lineAt(i).naturalTextWidth();
        }

    return m_startX;
}

int KateTextLayout::endX() const
{
    if (!isValid()) {
        return 0;
    }

    return startX() + (int)m_textLayout.naturalTextWidth();
}

int KateTextLayout::width() const
{
    if (!isValid()) {
        return 0;
    }

    return (int)m_textLayout.naturalTextWidth();
}

KateTextLayout KateTextLayout::invalid()
{
    return KateTextLayout();
}

bool KateTextLayout::isRightToLeft() const
{
    if (m_lineLayout) {
        return m_lineLayout->isRightToLeft();
    }

    return false;
}
