/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
    Copyright 2000-2022 the Rosegarden development team.
 
    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.
*/

#define RG_MODULE_STRING "[SegmentResizeFromStartCommand]"
#define RG_NO_DEBUG_PRINT 1

#include "SegmentResizeFromStartCommand.h"

#include "base/Event.h"
#include "base/Segment.h"
#include "document/BasicCommand.h"


namespace Rosegarden
{

SegmentResizeFromStartCommand::SegmentResizeFromStartCommand(Segment *s,
        timeT time) :
        BasicCommand(getGlobalName(), *s,
                     std::min(time, s->getStartTime()),
                     std::max(time, s->getStartTime())),
        m_segment(s),
        m_oldStartTime(s->getStartTime()),
        m_newStartTime(time)
{
    RG_DEBUG << "ctor Segment start end" <<
        s->getStartTime() << s->getEndTime();
    // nothing else
}

SegmentResizeFromStartCommand::~SegmentResizeFromStartCommand()
{
    // nothing
}

void
SegmentResizeFromStartCommand::modifySegment()
{
    RG_DEBUG << "modifySegment start Segment start end" <<
        m_segment->getStartTime() << m_segment->getEndTime();
    if (m_newStartTime < m_oldStartTime) {
        m_segment->fillWithRests(m_newStartTime, m_oldStartTime);
        // move the first clef to the start of the segment
        for (Segment::iterator i = m_segment->begin();
             m_segment->isBeforeEndMarker(i); ) {
            if ((*i)->getType() == Clef::EventType) {
                Event *newClef = new Event((**i), m_newStartTime);
                m_segment->erase(i);
                m_segment->insert(newClef);
                break;
            }
            ++i;
        }
        // move the first key change to the start of the segment
        for (Segment::iterator i = m_segment->begin();
             m_segment->isBeforeEndMarker(i); ) {
            if ((*i)->getType() == Key::EventType) {
                Event *newKey = new Event((**i), m_newStartTime);
                m_segment->erase(i);
                m_segment->insert(newKey);
                break;
            }
            ++i;
        }
    } else {

        for (Segment::iterator i = m_segment->begin();
                m_segment->isBeforeEndMarker(i); ) {

            Segment::iterator j = i;
            ++j;

            if ((*i)->getAbsoluteTime() >= m_newStartTime)
                break;

            if ((*i)->getAbsoluteTime() + (*i)->getDuration() <= m_newStartTime) {
                m_segment->erase(i);
            } else {
                Event *e = new Event
                           (**i, m_newStartTime,
                            (*i)->getAbsoluteTime() + (*i)->getDuration() - m_newStartTime);
                m_segment->erase(i);
                m_segment->insert(e);
            }

            i = j;
        }
    }
    RG_DEBUG << "modifySegment done Segment start end" <<
        m_segment->getStartTime() << m_segment->getEndTime();
}

}
