/*
    This file is part of the Okteta Gui library, part of the KDE project.

    Copyright 2003,2008-2009 Friedrich W. H. Kossebau <kossebau@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), which shall
    act as a proxy defined in Section 6 of version 3 of the license.

    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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/

#include "bytearraytablelayout.h"


namespace Okteta
{

static const LineSize DefaultNoOfLinesPerPage = 1;

ByteArrayTableLayout::ByteArrayTableLayout( Size noOfBytesPerLine, Address firstLineOffset, Address startOffset,
                                            Address byteArrayOffset, Size byteArrayLength )
 : mNoOfBytesPerLine( noOfBytesPerLine ),
   mFirstLineOffset( firstLineOffset ),
   mStartOffset( startOffset ),
   mRelativeStartOffset( startOffset-firstLineOffset ),
   mByteArrayOffset( byteArrayOffset ),
   mLastByteArrayOffset( byteArrayOffset+byteArrayLength-1 ),
   mNoOfLinesPerPage( DefaultNoOfLinesPerPage )
{
    calcStart();
    calcEnd();
}


bool ByteArrayTableLayout::setStartOffset( Address startOffset )
{
    // rejecting <0
    if( startOffset < 0 )
        startOffset = 0;

    if( mStartOffset == startOffset )
        return false;

    mStartOffset = startOffset;
    mRelativeStartOffset = mStartOffset - mFirstLineOffset;

    calcStart();
    calcEnd();
    return true;
}

bool ByteArrayTableLayout::setFirstLineOffset( Address firstLineOffset )
{
    // rejecting <0
    if( firstLineOffset < 0 )
        firstLineOffset = 0;

    if( mFirstLineOffset == firstLineOffset )
        return false;

    mFirstLineOffset = firstLineOffset;
    mRelativeStartOffset = mStartOffset - mFirstLineOffset;

    calcStart();
    calcEnd();
    return true;
}


bool ByteArrayTableLayout::setNoOfBytesPerLine( LineSize noOfBytesPerLine )
{
    // rejecting <1
    if( noOfBytesPerLine < 1 )
        noOfBytesPerLine = 1;

    // no changes?
    if( mNoOfBytesPerLine == noOfBytesPerLine )
        return false;

    mNoOfBytesPerLine = noOfBytesPerLine;

    calcStart();
    calcEnd();
    return true;
}


bool ByteArrayTableLayout::setByteArrayOffset( Address byteArrayOffset )
{
    // rejecting < 0
    if( byteArrayOffset < 0 )
        byteArrayOffset = 0;

    // no changes?
    if( mByteArrayOffset == byteArrayOffset )
        return false;

    const Size l = length();

    mByteArrayOffset = byteArrayOffset;
    mLastByteArrayOffset = mByteArrayOffset + l-1;

    calcEnd();
    return true;
}


bool ByteArrayTableLayout::setLength( Size length )
{
    // rejecting < 0
    if( length < 0 )
        length = 0;

    const Address newLastByteArrayOffset = mByteArrayOffset + length-1;

    // no changes?
    if( mLastByteArrayOffset == newLastByteArrayOffset )
        return false;

    mLastByteArrayOffset = newLastByteArrayOffset;

    calcEnd();
    return true;
}


void ByteArrayTableLayout::setNoOfLinesPerPage( LineSize noOfLinesPerPage )
{
    mNoOfLinesPerPage = noOfLinesPerPage;
}


void ByteArrayTableLayout::calcStart()
{
    mCoordRange.setStart( Coord::fromIndex(mRelativeStartOffset,mNoOfBytesPerLine) );
}


void ByteArrayTableLayout::calcEnd()
{
    const Size l = length();
    mCoordRange.setEnd( (l>0) ?
                            Coord::fromIndex(l-1+mRelativeStartOffset,mNoOfBytesPerLine):
                            Coord(-1,mCoordRange.start().line()) );
}


Address ByteArrayTableLayout::indexAtCFirstLinePosition( Line line ) const
{
    return ( line <= mCoordRange.start().line() ) ? mByteArrayOffset :
           ( line > mCoordRange.end().line() ) ?    mLastByteArrayOffset:
                                                    line * mNoOfBytesPerLine - mRelativeStartOffset + mByteArrayOffset;
}


Address ByteArrayTableLayout::indexAtCLastLinePosition( Line line ) const
{
    return ( line < mCoordRange.start().line() ) ? mByteArrayOffset :
           ( line >= mCoordRange.end().line() ) ?  mLastByteArrayOffset :
                                                   (line+1)*mNoOfBytesPerLine-mRelativeStartOffset-1 + mByteArrayOffset;
}


Address ByteArrayTableLayout::indexAtCCoord( const Coord& coord ) const
{
    const Address index = indexAtCoord( coord );

    return ( index <= mByteArrayOffset ) ?     mByteArrayOffset :
           ( index >= mLastByteArrayOffset ) ? mLastByteArrayOffset:
                                               index;
}


Line ByteArrayTableLayout::lineAtCIndex( Address index ) const
{
    return ( index <= mByteArrayOffset ) ?     mCoordRange.start().line():
           ( index >= mLastByteArrayOffset ) ? mCoordRange.end().line():
                                               lineAtIndex(index);
}


Coord ByteArrayTableLayout::coordOfCIndex( Address index ) const
{
    return ( index <= mByteArrayOffset ) ?     mCoordRange.start():
           ( index >= mLastByteArrayOffset ) ? mCoordRange.end():
                                               coordOfIndex(index);
}


Address ByteArrayTableLayout::indexAtFirstLinePosition( Line line ) const
{
    return ( line == mCoordRange.start().line() ) ? mByteArrayOffset : line*mNoOfBytesPerLine-mRelativeStartOffset+mByteArrayOffset;
}


Address ByteArrayTableLayout::indexAtLastLinePosition( Line line ) const
{
    return ( line == mCoordRange.end().line() ) ? mLastByteArrayOffset : (line+1)*mNoOfBytesPerLine-mRelativeStartOffset+mByteArrayOffset-1;
}


Address ByteArrayTableLayout::indexAtCoord( const Coord& coord ) const
{
    return coord.indexByLineWidth( mNoOfBytesPerLine ) - mRelativeStartOffset + mByteArrayOffset;
}

Line ByteArrayTableLayout::lineAtIndex( Address index ) const
{
    return (index+mRelativeStartOffset-mByteArrayOffset)/mNoOfBytesPerLine;
}

Coord ByteArrayTableLayout::coordOfIndex( Address index ) const
{
    return Coord::fromIndex( index+mRelativeStartOffset-mByteArrayOffset, mNoOfBytesPerLine );
}

CoordRange ByteArrayTableLayout::coordRangeOfIndizes( const AddressRange& indizes ) const
{
    return CoordRange(
             Coord::fromIndex(indizes.start()+mRelativeStartOffset-mByteArrayOffset, mNoOfBytesPerLine),
             Coord::fromIndex(indizes.end()+mRelativeStartOffset-mByteArrayOffset,   mNoOfBytesPerLine) );
}



Address ByteArrayTableLayout::correctIndex( Address index ) const
{
    return ( index <= mByteArrayOffset ) ?     mByteArrayOffset:
           ( index >= mLastByteArrayOffset ) ? mLastByteArrayOffset:
                                               index;
}


Coord ByteArrayTableLayout::correctCoord( const Coord& coord ) const
{
    return ( coord <= mCoordRange.start() ) ?    mCoordRange.start():
           ( coord >= mCoordRange.end() ) ?      mCoordRange.end():
           ( coord.pos() >= mNoOfBytesPerLine ) ? Coord( mNoOfBytesPerLine-1, coord.line() ):
                                                  coord;
}


bool ByteArrayTableLayout::atFirstLinePosition( const Coord& coord ) const
{
    return ( coord.line() == mCoordRange.start().line() ) ? coord.pos() == mCoordRange.start().pos():
                                                            coord.pos() == 0;
}

bool ByteArrayTableLayout::atLastLinePosition( const Coord& coord ) const
{
    return ( coord.line() == mCoordRange.end().line() ) ? coord.pos() == mCoordRange.end().pos():
                                                          coord.pos() == mNoOfBytesPerLine-1;
}


LinePositionRange ByteArrayTableLayout::linePositions( Line line ) const
{
    return LinePositionRange( firstLinePosition(line), lastLinePosition(line) );
}


LinePosition ByteArrayTableLayout::firstLinePosition( const Coord& coord ) const
{
    return ( mCoordRange.start().isLaterInLineThan(coord) ) ? mCoordRange.start().pos() : coord.pos();
}

LinePosition ByteArrayTableLayout::lastLinePosition( const Coord& coord ) const
{
    return ( mCoordRange.end().isPriorInLineThan(coord) ) ? mCoordRange.end().pos() : coord.pos();
}

LinePosition ByteArrayTableLayout::firstLinePosition( Line line ) const
{
    return line == mCoordRange.start().line() ? mCoordRange.start().pos() : 0;
}

LinePosition ByteArrayTableLayout::lastLinePosition( Line line ) const
{
    return ( line == mCoordRange.end().line() ) ? mCoordRange.end().pos() : mNoOfBytesPerLine-1;
}

bool ByteArrayTableLayout::hasContent( Line line ) const
{
    return mCoordRange.includesLine( line );
}

ByteArrayTableLayout::~ByteArrayTableLayout() {}

}
