/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
 
    This program is Copyright 2000-2008
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <richard.bown@ferventsoftware.com>
 
    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    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.  See the file
    COPYING included with this distribution for more information.
*/

#include <cmath>

#include "CompositionItemHelper.h"

#include "base/Segment.h"
#include "base/SnapGrid.h"
#include "misc/Debug.h"
#include "CompositionModel.h"
#include "CompositionItemImpl.h"
#include <tqcolor.h>
#include <tqpoint.h>
#include <tqrect.h>

namespace Rosegarden
{
    
timeT CompositionItemHelper::getStartTime(const CompositionItem& item, const Rosegarden::SnapGrid& grid)
{
    timeT t = 0;

    if (item) {
    // t = std::max(grid.snapX(item->rect().x()), 0L); - wrong, we can have negative start times,
        // and if we do this we 'crop' segments when they are moved before the start of the composition
    t = grid.snapX(item->rect().x());

//         RG_DEBUG << "CompositionItemHelper::getStartTime(): item is repeating : " << item->isRepeating()
//                  << " - startTime = " << t
//                  << endl;
    }

    return t;
}

timeT CompositionItemHelper::getEndTime(const CompositionItem& item, const Rosegarden::SnapGrid& grid)
{
    timeT t = 0;

    if (item) {
        TQRect itemRect = item->rect();
        
        t = std::max(grid.snapX(itemRect.x() + itemRect.width()), 0L);

//         RG_DEBUG << "CompositionItemHelper::getEndTime() : rect width = "
//                  << itemRect.width()
//                  << " - item is repeating : " << item->isRepeating()
//                  << " - endTime = " << t
//                  << endl;

    }

    return t;
}

void CompositionItemHelper::setStartTime(CompositionItem& item, timeT time,
                                         const Rosegarden::SnapGrid& grid)
{
    if (item) {
        int x = int(nearbyint(grid.getRulerScale()->getXForTime(time)));

        RG_DEBUG << "CompositionItemHelper::setStartTime() time = " << time
                 << " -> x = " << x << endl;
        
        int curX = item->rect().x();
        item->setX(x);
        if (item->isRepeating()) {
            int deltaX = curX - x;
            CompositionRect& sr = dynamic_cast<CompositionItemImpl*>((_CompositionItem*)item)->getCompRect();
            int curW = sr.getBaseWidth();
            sr.setBaseWidth(curW + deltaX);
        }
        
    }
    
}

void CompositionItemHelper::setEndTime(CompositionItem& item, timeT time,
                                       const Rosegarden::SnapGrid& grid)
{
    if (item) {
        int x = int(nearbyint(grid.getRulerScale()->getXForTime(time)));
        TQRect r = item->rect();
        TQPoint topRight = r.topRight();
        topRight.setX(x);
        r.setTopRight(topRight);
        item->setWidth(r.width());

        if (item->isRepeating()) {
            CompositionRect& sr = dynamic_cast<CompositionItemImpl*>((_CompositionItem*)item)->getCompRect();
            sr.setBaseWidth(r.width());
        }
    }
}

int CompositionItemHelper::getTrackPos(const CompositionItem& item, const Rosegarden::SnapGrid& grid)
{
    return grid.getYBin(item->rect().y());
}

Rosegarden::Segment* CompositionItemHelper::getSegment(CompositionItem item)
{
    return (dynamic_cast<CompositionItemImpl*>((_CompositionItem*)item))->getSegment();
}

CompositionItem CompositionItemHelper::makeCompositionItem(Rosegarden::Segment* segment)
{
    return CompositionItem(new CompositionItemImpl(*segment, TQRect()));
}

CompositionItem CompositionItemHelper::findSiblingCompositionItem(const CompositionModel::itemcontainer& items,
                                                                  const CompositionItem& referenceItem)
{
    CompositionModel::itemcontainer::const_iterator it;
    Rosegarden::Segment* currentSegment = CompositionItemHelper::getSegment(referenceItem);

    for (it = items.begin(); it != items.end(); it++) {
        CompositionItem item = *it;
        Rosegarden::Segment* segment = CompositionItemHelper::getSegment(item);
        if (segment == currentSegment) {
            return item;
        }
    }

    return referenceItem;
}
    
}