#------------------------------------------------------------
# Copyright (C) 2006 RoyaltyShare, Inc.   All Rights Reserved
# $Id$
#------------------------------------------------------------
package RPS::Track::Command::MoveDown;
use strict;
use warnings;

use lib '/app/tools/rps/lib';
use RPS::DB::Item::Track;

use lib '/app/tools/common/lib';
use RSApache::Response::JSON;
use Common::FormObject;
use Common::Assert;

use RPS::Command;
use base 'RPS::Command';

sub cmd  { return 'down'; }
sub area { return 'track'; }

use constant kTemplate => "/app/tools/rps/templates/track/index.xsl";

sub execute
{
	my ($self) = @_;

	my $response = $self->SUPER::execute();
	return $response if $response;

	my $trackID = $self->getParam('TrackID');
    assert($trackID);

    my $trackData = RPS::DB::Item::Track->Lookup(track_id => $trackID);
    my $currentPosition = $trackData->track_order;

    my $responseCode = 0;
    my $albumID = $trackData->album_id;
    my $maxPosition = RPS::DB::Item::Track->GetTrackCountByAlbumID($albumID);

    # Trying to make the last track go down would be an error...
    #
    if ($currentPosition < $maxPosition)
    {
        # Find the track that is 'below' this one.
        #
        my $newPosition = $currentPosition + 1;
        my $otherTrack = RPS::DB::Item::Track->Lookup(album_id => $albumID, track_order => $newPosition);
        if ($otherTrack)
        {
            $otherTrack->track_order($currentPosition);
            $trackData->track_order($newPosition);
            $otherTrack->save();
            $trackData->save();
            $responseCode = 1;
        }
    }

    $response = RSApache::Response::JSON->new($responseCode);

	return $response;
}


1;