/* -*- 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 2000-2011 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.
*/


#include "PasteSegmentsCommand.h"

#include "base/Clipboard.h"
#include "base/Composition.h"
#include "base/Segment.h"
#include "base/Track.h"
#include "gui/application/RosegardenMainWindow.h"
#include "document/RosegardenDocument.h"

#include <QString>


namespace Rosegarden
{

PasteSegmentsCommand::PasteSegmentsCommand(Composition *composition,
        Clipboard *clipboard,
        timeT pasteTime,
        TrackId baseTrack,
        bool useExactTracks) :
        NamedCommand(getGlobalName()),
        m_composition(composition),
        m_clipboard(new Clipboard(*clipboard)),
        m_pasteTime(pasteTime),
        m_baseTrack(baseTrack),
        m_exactTracks(useExactTracks),
        m_detached(false)
{
    // nothing else
}

PasteSegmentsCommand::~PasteSegmentsCommand()
{
    if (m_detached) {
        for (size_t i = 0; i < m_addedSegments.size(); ++i) {
            delete m_addedSegments[i];
        }
    }

    delete m_clipboard;
}

void
PasteSegmentsCommand::execute()
{
    if (m_addedSegments.size() > 0) {
        // been here before
        for (size_t i = 0; i < m_addedSegments.size(); ++i) {
            m_composition->addSegment(m_addedSegments[i]);
        }
        return ;
    }

    if (m_clipboard->isEmpty())
        return ;

    // We want to paste such that the earliest Segment starts at
    // m_pasteTime and the others start at the same times relative to
    // that as they did before.  Likewise for track, unless
    // m_exactTracks is set.

    timeT earliestStartTime = m_clipboard->getBaseTime();
    timeT latestEndTime = 0;
    int lowestTrackPos = -1;

    for (Clipboard::iterator i = m_clipboard->begin();
            i != m_clipboard->end(); ++i) {

        int trackPos = m_composition->getTrackPositionById((*i)->getTrack());
        if (trackPos >= 0 &&
                (lowestTrackPos < 0 || trackPos < lowestTrackPos)) {
            lowestTrackPos = trackPos;
        }

        if ((*i)->getEndMarkerTime() > latestEndTime) {
            latestEndTime = (*i)->getEndMarkerTime();
        }
    }

    if (m_exactTracks)
        lowestTrackPos = 0;
    if (lowestTrackPos < 0)
        lowestTrackPos = 0;
    timeT offset = m_pasteTime - earliestStartTime;
    int baseTrackPos = m_composition->getTrackPositionById(m_baseTrack);
    int trackOffset = baseTrackPos - lowestTrackPos;

    for (Clipboard::iterator i = m_clipboard->begin();
            i != m_clipboard->end(); ++i) {
 
        // If the segment is an audio segment
        if ((*i)->getType() == Segment::Audio)
            // If the segment's file ID isn't in the audio file manager
            if (!RosegardenMainWindow::self()->getDocument()->
                getAudioFileManager().fileExists((*i)->getAudioFileId())) {
                // Skip pasting it.
                continue;
            }

        int newTrackPos = trackOffset +
                          m_composition->getTrackPositionById((*i)->getTrack());

        Track *track = m_composition->getTrackByPosition(newTrackPos);

        if (!track) {
            newTrackPos = 0;
            track = m_composition->getTrackByPosition(newTrackPos);
        }

        TrackId newTrackId = track->getId();

        Segment *segment = new Segment(**i);
        segment->setStartTime(segment->getStartTime() + offset);
        segment->setTrack(newTrackId);
        m_composition->addSegment(segment);
        if (m_clipboard->isPartial()) {
            segment->normalizeRests(segment->getStartTime(),
                                    segment->getEndMarkerTime());
        }
        m_addedSegments.push_back(segment);
    }

    // User preference? Update song pointer position on paste
    // ??? This needs to refresh the display so the user can see the change.
    //   RosegardenDocument::pointerPositionChanged() appears to be the
    //   signal to send, but we have no visibility to RosegardenDocument.
    //   Removing this for now as it is confusing.
//    m_composition->setPosition(latestEndTime
//                               + m_pasteTime
//                               - earliestStartTime);

    m_detached = false;
}

void
PasteSegmentsCommand::unexecute()
{
    for (size_t i = 0; i < m_addedSegments.size(); ++i) {
        m_composition->detachSegment(m_addedSegments[i]);
    }
    m_detached = true;
}

}