#include "global.h"
#include "Song.h"
#include "Steps.h"
#include "RageUtil.h"
#include "RageLog.h"
#include "NoteData.h"
#include "RageSoundReader_FileReader.h"
#include "RageSurface_Load.h"
#include "SongCacheIndex.h"
#include "GameManager.h"
#include "PrefsManager.h"
#include "Style.h"
#include "FontCharAliases.h"
#include "TitleSubstitution.h"
#include "BannerCache.h"
//#include "BackgroundCache.h"
#include "Sprite.h"
#include "RageFileManager.h"
#include "RageSurface.h"
#include "NoteDataUtil.h"
#include "SongUtil.h"
#include "StepsUtil.h"
#include "Foreach.h"
#include "BackgroundUtil.h"
#include "SpecialFiles.h"
#include "NotesLoader.h"
#include "NotesLoaderSM.h"
#include "NotesLoaderSSC.h"
#include "NotesWriterDWI.h"
#include "NotesWriterSM.h"
#include "NotesWriterSSC.h"
#include "UnlockManager.h"
#include "LyricsLoader.h"

#include <time.h>
#include <set>
#include <float.h>


/**
 * @brief The internal version of the cache for StepMania.
 *
 * Increment this value to invalidate the current cache. */
const int FILE_CACHE_VERSION = 167;

/** @brief How long does a song sample last by default? */
const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;

static Preference<float>	g_fLongVerSongSeconds( "LongVerSongSeconds", 60*2.5f );
static Preference<float>	g_fMarathonVerSongSeconds( "MarathonVerSongSeconds", 60*5.f );
static Preference<bool>		g_BackUpAllSongSaves( "BackUpAllSongSaves", false );

static const char *InstrumentTrackNames[] = {
	"Guitar",
	"Rhythm",
	"Bass",
};
XToString( InstrumentTrack );
StringToX( InstrumentTrack );

Song::Song()
{
	FOREACH_BackgroundLayer( i )
		m_BackgroundChanges[i] = AutoPtrCopyOnWrite<VBackgroundChange>(new VBackgroundChange);
	m_ForegroundChanges = AutoPtrCopyOnWrite<VBackgroundChange>(new VBackgroundChange);

	m_LoadedFromProfile = ProfileSlot_Invalid;
	m_fVersion = STEPFILE_VERSION_NUMBER;
	m_fMusicSampleStartSeconds = -1;
	m_fMusicSampleLengthSeconds = DEFAULT_MUSIC_SAMPLE_LENGTH;
	m_fMusicLengthSeconds = 0;
	m_fFirstBeat = -1;
	m_fLastBeat = -1;
	m_fSpecifiedLastBeat = -1;
	m_SelectionDisplay = SHOW_ALWAYS;
	m_bEnabled = true;
	m_DisplayBPMType = DISPLAY_ACTUAL;
	m_fSpecifiedBPMMin = 0;
	m_fSpecifiedBPMMax = 0;
	m_bIsSymLink = false;
	m_bHasMusic = false;
	m_bHasBanner = false;
	m_bHasBackground = false;
}

Song::~Song()
{
	FOREACH( Steps*, m_vpSteps, s )
		SAFE_DELETE( *s );
	m_vpSteps.clear();
	
	// It's the responsibility of the owner of this Song to make sure
	// that all pointers to this Song and its Steps are invalidated.
}

void Song::DetachSteps()
{
	m_vpSteps.clear();
	FOREACH_ENUM( StepsType, st )
		m_vpStepsByType[st].clear();
}

// Reset to an empty song.
void Song::Reset()
{
	FOREACH( Steps*, m_vpSteps, s )
		SAFE_DELETE( *s );
	m_vpSteps.clear();
	FOREACH_ENUM( StepsType, st )
		m_vpStepsByType[st].clear();

	Song empty;
	*this = empty;

	// It's the responsibility of the owner of this Song to make sure
	// that all pointers to this Song and its Steps are invalidated.
}


void Song::AddBackgroundChange( BackgroundLayer iLayer, BackgroundChange seg )
{
	// Delete old background change at this start beat, if any.
	FOREACH( BackgroundChange, GetBackgroundChanges(iLayer), bgc )
	{
		if( bgc->m_fStartBeat == seg.m_fStartBeat )
		{
			GetBackgroundChanges(iLayer).erase( bgc );
			break;
		}
	}

	ASSERT( iLayer >= 0 && iLayer < NUM_BackgroundLayer );
	GetBackgroundChanges(iLayer).push_back( seg );
	BackgroundUtil::SortBackgroundChangesArray( GetBackgroundChanges(iLayer) );
}

void Song::AddForegroundChange( BackgroundChange seg )
{
	GetForegroundChanges().push_back( seg );
	BackgroundUtil::SortBackgroundChangesArray( GetForegroundChanges() );
}

void Song::AddLyricSegment( LyricSegment seg )
{
	m_LyricSegments.push_back( seg );
}

void Song::GetDisplayBpms( DisplayBpms &AddTo ) const
{
	if( m_DisplayBPMType == DISPLAY_SPECIFIED )
	{
		AddTo.Add( m_fSpecifiedBPMMin );
		AddTo.Add( m_fSpecifiedBPMMax );
	}
	else
	{
		float fMinBPM, fMaxBPM;
		m_Timing.GetActualBPM( fMinBPM, fMaxBPM );
		AddTo.Add( fMinBPM );
		AddTo.Add( fMaxBPM );
	}
}

const BackgroundChange &Song::GetBackgroundAtBeat( BackgroundLayer iLayer, float fBeat ) const
{
	for( unsigned i=0; i<GetBackgroundChanges(iLayer).size()-1; i++ )
		if( GetBackgroundChanges(iLayer)[i+1].m_fStartBeat > fBeat )
			return GetBackgroundChanges(iLayer)[i];
	return GetBackgroundChanges(iLayer)[0];
}


RString Song::GetCacheFilePath() const
{
	return SongCacheIndex::GetCacheFilePath( "Songs", m_sSongDir );
}

// Get a path to the SM containing data for this song. It might be a cache file.
const RString &Song::GetSongFilePath() const
{
	ASSERT( !m_sSongFileName.empty() );
	return m_sSongFileName;
}

/* Hack: This should be a parameter to TidyUpData, but I don't want to pull in
 * <set> into Song.h, which is heavily used. */
static set<RString> BlacklistedImages;

/* If PREFSMAN->m_bFastLoad is true, always load from cache if possible.
 * Don't read the contents of sDir if we can avoid it. That means we can't call
 * HasMusic(), HasBanner() or GetHashForDirectory().
 * If true, check the directory hash and reload the song from scratch if it's changed.
 */
bool Song::LoadFromSongDir( RString sDir )
{
//	LOG->Trace( "Song::LoadFromSongDir(%s)", sDir.c_str() );
	ASSERT( sDir != "" );

	// make sure there is a trailing slash at the end of sDir
	if( sDir.Right(1) != "/" )
		sDir += "/";

	// save song dir
	m_sSongDir = sDir;

	// save group name
	vector<RString> sDirectoryParts;
	split( m_sSongDir, "/", sDirectoryParts, false );
	ASSERT( sDirectoryParts.size() >= 4 ); /* e.g. "/Songs/Slow/Taps/" */
	m_sGroupName = sDirectoryParts[sDirectoryParts.size()-3];	// second from last item
	ASSERT( m_sGroupName != "" );

	// First, look in the cache for this song (without loading NoteData)
	unsigned uCacheHash = SONGINDEX->GetCacheHash(m_sSongDir);
	bool bUseCache = true;
	RString sCacheFilePath = GetCacheFilePath();

	if( !DoesFileExist(sCacheFilePath) )
		bUseCache = false;
	if( !PREFSMAN->m_bFastLoad && GetHashForDirectory(m_sSongDir) != uCacheHash )
		bUseCache = false; // this cache is out of date 

	if( bUseCache )
	{
//		LOG->Trace( "Loading '%s' from cache file '%s'.", m_sSongDir.c_str(), GetCacheFilePath().c_str() );
		bool bLoadedFromSSC = SSCLoader::LoadFromSSCFile( sCacheFilePath, *this, true );
		if( bLoadedFromSSC )
			SSCLoader::TidyUpData( *this, true );
		else
		{
			// load from .sm
			SMLoader::LoadFromSMFile( sCacheFilePath, *this, true );
			SMLoader::TidyUpData( *this, true );
		}
	}
	else
	{
		// There was no entry in the cache for this song, or it was out of date.
		// Let's load it from a file, then write a cache entry.

		if( !NotesLoader::LoadFromDir(sDir, *this, BlacklistedImages) )
		{
			LOG->UserLog( "Song", sDir, "has no SM, DWI, BMS, or KSF files." );

			vector<RString> vs;
			GetDirListing( sDir + "*.mp3", vs, false, false ); 
			GetDirListing( sDir + "*.oga", vs, false, false ); 
			GetDirListing( sDir + "*.ogg", vs, false, false ); 
			bool bHasMusic = !vs.empty();

			if( !bHasMusic )
			{
				LOG->UserLog( "Song", sDir, "has no music file either. Ignoring this song directory." );
				return false;
			}

			// Continue on with a blank Song so that people can make adjustments using the editor.
		}
		TidyUpData();

		// save a cache file so we don't have to parse it all over again next time
		if( !SaveToCacheFile() )
			sCacheFilePath = RString();
	}

	FOREACH( Steps*, m_vpSteps, s )
	{
		(*s)->SetFilename( sCacheFilePath );

		/* Compress all Steps. During initial caching, this will remove cached
		 * NoteData; during cached loads, this will just remove cached SMData. */
		(*s)->Compress();
	}

	// Load the cached banners, if it's not loaded already.
	if( PREFSMAN->m_BannerCache == BNCACHE_LOW_RES_PRELOAD && m_bHasBanner )
		BANNERCACHE->LoadBanner( GetBannerPath() );
	// Load the cached background, if it's not loaded already.
	/*
	if( PREFSMAN->m_BackgroundCache == BGCACHE_LOW_RES_PRELOAD && m_bHasBackground )
		BACKGROUNDCACHE->LoadBackground( GetBackgroundPath() );
	*/

	// Add AutoGen pointers. (These aren't cached.)
	AddAutoGenNotes();

	if( !m_bHasMusic )
	{
		LOG->UserLog( "Song", sDir, "has no music; ignored." );
		return false;	// don't load this song
	}

	return true;	// do load this song
}

bool Song::ReloadFromSongDir( RString sDir )
{
	RemoveAutoGenNotes();
	vector<Steps*> vOldSteps = m_vpSteps;

	Song copy;
	if( !copy.LoadFromSongDir( sDir ) )
		return false;
	copy.RemoveAutoGenNotes();
	*this = copy;

	// First we assemble a map to let us easily find the new steps
	map<StepsID, Steps*> mNewSteps;
	for( vector<Steps*>::const_iterator it = m_vpSteps.begin(); it != m_vpSteps.end(); ++it )
	{
		StepsID id;
		id.FromSteps( *it );
		mNewSteps[id] = *it;
	}

	// Now we wipe out the new pointers, which were shallow copied and not deep copied...
	m_vpSteps.clear();
	FOREACH_ENUM( StepsType, i )
		m_vpStepsByType[i].clear();

	// Then we copy as many Steps as possible on top of the old pointers.
	// The only pointers that change are pointers to Steps that are not in the
	// reverted file, which we delete, and pointers to Steps that are in the
	// reverted file but not the original *this, which we create new copies of.
	// We have to go through these hoops because many places assume the Steps
	// pointers don't change - even though there are other ways they can change,
	// such as deleting a Steps via the editor.
	for( vector<Steps*>::const_iterator itOld = vOldSteps.begin(); itOld != vOldSteps.end(); ++itOld )
	{
		StepsID id;
		id.FromSteps( *itOld );
		map<StepsID, Steps*>::iterator itNew = mNewSteps.find( id );
		if( itNew == mNewSteps.end() )
		{
			// This stepchart didn't exist in the file we reverted from
			delete *itOld;
		}
		else
		{
			Steps *OldSteps = *itOld;
			*OldSteps = *(itNew->second);
			AddSteps( OldSteps );
			mNewSteps.erase( itNew );
		}
	}
	// The leftovers in the map are steps that didn't exist before we reverted
	for( map<StepsID, Steps*>::const_iterator it = mNewSteps.begin(); it != mNewSteps.end(); ++it )
	{
		Steps *NewSteps = new Steps();
		*NewSteps = *(it->second);
		AddSteps( NewSteps );
	}

	AddAutoGenNotes();
	return true;
}

static void GetImageDirListing( RString sPath, vector<RString> &AddTo )
{
	GetDirListing( sPath + ".png", AddTo, false, false );
	GetDirListing( sPath + ".jpg", AddTo, false, false );
	GetDirListing( sPath + ".bmp", AddTo, false, false );
	GetDirListing( sPath + ".gif", AddTo, false, false );
}

/* Fix up song paths. If there's a leading "./", be sure to keep it: it's
 * a signal that the path is from the root directory, not the song directory.
 * Other than a leading "./", song paths must never contain "." or "..". */
void FixupPath( RString &path, const RString &sSongPath )
{
	// Replace backslashes with slashes in all paths.
	FixSlashesInPlace( path );

	/* Many imported files contain erroneous whitespace before or after
	 * filenames. Paths usually don't actually start or end with spaces,
	 * so let's just remove it. */
	Trim( path );
}

// Songs in BlacklistImages will never be autodetected as song images.
void Song::TidyUpData()
{
	// We need to do this before calling any of HasMusic, HasHasCDTitle, etc.
	ASSERT_M( m_sSongDir.Left(3) != "../", m_sSongDir ); // meaningless
	FixupPath( m_sSongDir, "" );
	FixupPath( m_sMusicFile, m_sSongDir );
	FOREACH_ENUM( InstrumentTrack, i )
		if( !m_sInstrumentTrackFile[i].empty() )
			FixupPath( m_sInstrumentTrackFile[i], m_sSongDir );
	FixupPath( m_sBannerFile, m_sSongDir );
	//FixupPath( m_sJacketFile, m_sSongDir );
	//FixupPath( m_sDiscFile, m_sSongDir );
	FixupPath( m_sLyricsFile, m_sSongDir );
	FixupPath( m_sBackgroundFile, m_sSongDir );
	FixupPath( m_sCDTitleFile, m_sSongDir );

	if( !HasMusic() )
	{
		vector<RString> arrayPossibleMusic;
		GetDirListing( m_sSongDir + RString("*.mp3"), arrayPossibleMusic );
		GetDirListing( m_sSongDir + RString("*.oga"), arrayPossibleMusic );
		GetDirListing( m_sSongDir + RString("*.ogg"), arrayPossibleMusic );
		GetDirListing( m_sSongDir + RString("*.wav"), arrayPossibleMusic );

		if( !arrayPossibleMusic.empty() )
		{
			int idx = 0;
			/* If the first song is "intro", and we have more than one available,
			 * don't use it--it's probably a KSF intro music file, which we don't
			 * (yet) support. */
			if( arrayPossibleMusic.size() > 1 &&
				!arrayPossibleMusic[0].Left(5).CompareNoCase("intro") )
				++idx;

			// we found a match
			m_sMusicFile = arrayPossibleMusic[idx];
		}
	}

	// This must be done before radar calculation.
	if( HasMusic() )
	{
		RString error;
		RageSoundReader *Sample = RageSoundReader_FileReader::OpenFile( GetMusicPath(), error );
		/* XXX: Checking if the music file exists eliminates a warning
		 * originating from BMS files (which have no music file, per se)
		 * but it's something of a hack. */
		if( Sample == NULL && m_sMusicFile != "" )
		{
			LOG->UserLog( "Sound file", GetMusicPath(), "couldn't be opened: %s", error.c_str() );

			// Don't use this file.
			m_sMusicFile = "";
		}
		else if ( Sample != NULL )
		{
			m_fMusicLengthSeconds = Sample->GetLength() / 1000.0f;
			delete Sample;

			if( m_fMusicLengthSeconds < 0 )
			{
				// It failed; bad file or something. It's already logged a warning.
				m_fMusicLengthSeconds = 100; // guess
			}
			else if( m_fMusicLengthSeconds == 0 )
			{
				LOG->UserLog( "Sound file", GetMusicPath(), "is empty." );
			}
		}
	}
	else	// ! HasMusic()
	{
		m_fMusicLengthSeconds = 100; // guess
		LOG->UserLog( "Song", GetSongDir(), "has no music file; guessing at %f seconds", m_fMusicLengthSeconds );
	}

	if( m_fMusicLengthSeconds < 0 )
	{
		LOG->UserLog( "Sound file", GetMusicPath(), "has a negative length %f.", m_fMusicLengthSeconds );
		m_fMusicLengthSeconds = 0;
	}

	/* Generate these before we autogen notes, so the new notes can inherit
	 * their source's values. */
	ReCalculateRadarValuesAndLastBeat();

	Trim( m_sMainTitle );
	Trim( m_sSubTitle );
	Trim( m_sArtist );

	// Fall back on the song directory name.
	if( m_sMainTitle == "" )
		NotesLoader::GetMainAndSubTitlesFromFullTitle( Basename(this->GetSongDir()), m_sMainTitle, m_sSubTitle );

	if( m_sArtist == "" )
		m_sArtist = "Unknown artist";
	TranslateTitles();

	if( m_Timing.m_BPMSegments.empty() )
	{
		LOG->UserLog( "Song file", m_sSongDir + m_sSongFileName, "has no BPM segments, default provided." );

		m_Timing.AddBPMSegment( BPMSegment(0, 60) );
	}

	// Make sure the first BPM segment starts at beat 0.
	if( m_Timing.m_BPMSegments[0].m_iStartRow != 0 )
		m_Timing.m_BPMSegments[0].m_iStartRow = 0;


	if( m_fMusicSampleStartSeconds == -1 ||
		m_fMusicSampleStartSeconds == 0 ||
		m_fMusicSampleStartSeconds+m_fMusicSampleLengthSeconds > this->m_fMusicLengthSeconds )
	{
		m_fMusicSampleStartSeconds = this->GetElapsedTimeFromBeat( 100 );

		if( m_fMusicSampleStartSeconds+m_fMusicSampleLengthSeconds > this->m_fMusicLengthSeconds )
		{
			int iBeat = lrintf( m_fLastBeat/2 );
			iBeat -= iBeat%4;
			m_fMusicSampleStartSeconds = this->GetElapsedTimeFromBeat( (float)iBeat );
		}
	}

	// The old logic meant that you couldn't have sample lengths that go forever,
	// e.g. those in Donkey Konga. I never liked that. -freem
	if( m_fMusicSampleLengthSeconds <= 0.00f )
		m_fMusicSampleLengthSeconds = DEFAULT_MUSIC_SAMPLE_LENGTH;

	// Here's the problem:  We have a directory full of images. We want to
	// determine which image is the banner, which is the background, and which
	// is the CDTitle.

	CHECKPOINT_M( "Looking for images..." );

	// First, check the file name for hints.
	if( !HasBanner() )
	{
		/* If a nonexistant banner file is specified, and we can't find a
		 * replacement, don't wipe out the old value. */
//		m_sBannerFile = "";

		// find an image with "banner" in the file name
		vector<RString> arrayPossibleBanners;
		GetImageDirListing( m_sSongDir + "*banner*", arrayPossibleBanners );

		/* Some people do things differently for the sake of being different.
		 * Don't match eg. abnormal, numbness. */
		GetImageDirListing( m_sSongDir + "* BN", arrayPossibleBanners );

		if( !arrayPossibleBanners.empty() )
			m_sBannerFile = arrayPossibleBanners[0];
	}

	if( !HasBackground() )
	{
//		m_sBackgroundFile = "";

		// find an image with "bg" or "background" in the file name
		vector<RString> arrayPossibleBGs;
		GetImageDirListing( m_sSongDir + "*bg*", arrayPossibleBGs );
		GetImageDirListing( m_sSongDir + "*background*", arrayPossibleBGs );
		if( !arrayPossibleBGs.empty() )
			m_sBackgroundFile = arrayPossibleBGs[0];
	}

	/*
	if( !HasJacket() )
	{
		// find an image with "jacket" or "albumart" in the filename.
		vector<RString> arrayPossibleJackets;
		GetImageDirListing( m_sSongDir + "jk_*", arrayPossibleJackets );
		GetImageDirListing( m_sSongDir + "*jacket*", arrayPossibleJackets );
		GetImageDirListing( m_sSongDir + "*albumart*", arrayPossibleJackets );
		if( !arrayPossibleJackets.empty() )
			m_sJacketFile = arrayPossibleJackets[0];
	}
	*/

	/*
	if( !HasCDImage() )
	{
		// CD image, a la ddr 1st-3rd (not to be confused with CDTitles)
		// find an image with "cd" at the end of the filename.
		vector<RString> arrayPossibleCDImages;
		GetImageDirListing( m_sSongDir + "* CD", arrayPossibleCDImages );
		if( !arrayPossibleCDImages.empty() )
			m_sCDFile = arrayPossibleCDImages[0];
	}
	*/

	/*
	if( !HasDisc() )
	{
		// a rectangular graphic, not to be confused with CDImage above.
	}
	*/

	if( !HasCDTitle() )
	{
		// find an image with "cdtitle" in the file name
		vector<RString> arrayPossibleCDTitles;
		GetImageDirListing( m_sSongDir + "*cdtitle*", arrayPossibleCDTitles );
		if( !arrayPossibleCDTitles.empty() )
			m_sCDTitleFile = arrayPossibleCDTitles[0];
	}

	if( !HasLyrics() )
	{
		// Check if there is a lyric file in here
		vector<RString> arrayLyricFiles;
		GetDirListing(m_sSongDir + RString("*.lrc"), arrayLyricFiles );
		if(	!arrayLyricFiles.empty() )
			m_sLyricsFile = arrayLyricFiles[0];
	}

	// Now, For the images we still haven't found, look at the image dimensions of the remaining unclassified images.
	vector<RString> arrayImages;
	GetImageDirListing( m_sSongDir + "*", arrayImages );

	for( unsigned i=0; i<arrayImages.size(); i++ )	// foreach image
	{
		if( HasBanner() && HasCDTitle() && HasBackground() )
			break; // done

		// ignore DWI "-char" graphics
		RString sLower = arrayImages[i];
		sLower.MakeLower();
		if( BlacklistedImages.find(sLower) != BlacklistedImages.end() )
			continue;	// skip

		// Skip any image that we've already classified

		if( HasBanner()  &&  stricmp(m_sBannerFile, arrayImages[i])==0 )
			continue;	// skip

		if( HasBackground()  &&  stricmp(m_sBackgroundFile, arrayImages[i])==0 )
			continue;	// skip

		if( HasCDTitle()  &&  stricmp(m_sCDTitleFile, arrayImages[i])==0 )
			continue;	// skip

		// todo: add checks for Jacket, Disc, and CDImage -aj

		RString sPath = m_sSongDir + arrayImages[i];

		// We only care about the dimensions.
		RString error;
		RageSurface *img = RageSurfaceUtils::LoadFile( sPath, error, true );
		if( !img )
		{
			LOG->UserLog( "Graphic file", sPath, "couldn't be loaded: %s", error.c_str() );
			continue;
		}

		const int width = img->w;
		const int height = img->h;
		delete img;

		if( !HasBackground()  &&  width >= 320  &&  height >= 240 )
		{
			m_sBackgroundFile = arrayImages[i];
			continue;
		}

		if( !HasBanner() && Sprite::IsDiagonalBanner(width, height) )
		{
			m_sBannerFile = arrayImages[i];
			continue;
		}

		if( !HasBanner()  &&  100<=width  &&  width<=320  &&  50<=height  &&  height<=240 )
		{
			m_sBannerFile = arrayImages[i];
			continue;
		}

		/* Some songs have overlarge banners. Check if the ratio is reasonable
		 * (over 2:1; usually over 3:1), and large (not a cdtitle). */
		if( !HasBanner() && width > 200 && float(width) / height > 2.0f )
		{
			m_sBannerFile = arrayImages[i];
			continue;
		}

		/* Agh. DWI's inline title images are triggering this, resulting in
		 * kanji, etc., being used as a CDTitle for songs with none. Some
		 * sample data from random incarnations:
		 *   42x50 35x50 50x50 144x49
		 * It looks like ~50 height is what people use to align to DWI's font.
		 *
		 * My tallest CDTitle is 44. Let's cut off in the middle and hope for
		 * the best. -(who? -aj) */
		/* The proper size of a CDTitle is 64x48 or sometihng. Simfile artists
		 * typically don't give a shit about this (see Cetaka's fucking banner
		 * -sized CDTitle). This is also subverted in certain designs (beta
		 * Mungyodance 3 simfiles, for instance, used the CDTitle to hold
		 * various information about the song in question). As it stands,
		 * I'm keeping this code until I figure out wtf to do -aj
		 */
		if( !HasCDTitle()  &&  width<=100  &&  height<=48 )
		{
			m_sCDTitleFile = arrayImages[i];
			continue;
		}

		// todo: add checks for Jacket, Disc, and CDImage -aj
	}

	// These will be written to cache, for Song::LoadFromSongDir to use later.
	m_bHasMusic = HasMusic();
	m_bHasBanner = HasBanner();
	m_bHasBackground = HasBackground();

	if( HasBanner() )
		BANNERCACHE->CacheBanner( GetBannerPath() );
	/*
	if( HasBackground() )
		BANNERCACHE->CacheBackground( GetBackgroundPath() );
	*/

	// If no BGChanges are specified and there are movies in the song directory, then assume
	// they are DWI style where the movie begins at beat 0.
	if( !HasBGChanges() )
	{
		vector<RString> arrayPossibleMovies;
		GetDirListing( m_sSongDir + RString("*.ogv"), arrayPossibleMovies );
		GetDirListing( m_sSongDir + RString("*.avi"), arrayPossibleMovies );
		GetDirListing( m_sSongDir + RString("*.mpg"), arrayPossibleMovies );
		GetDirListing( m_sSongDir + RString("*.mpeg"), arrayPossibleMovies );
		/* Use this->GetBeatFromElapsedTime(0) instead of 0 to start when the
		 * music starts. */
		if( arrayPossibleMovies.size() == 1 )
			this->AddBackgroundChange( BACKGROUND_LAYER_1, BackgroundChange(0,arrayPossibleMovies[0],"",1.f,SBE_StretchNoLoop) );
	}


	/* Don't allow multiple Steps of the same StepsType and Difficulty (except
	 * for edits). We should be able to use difficulty names as unique
	 * identifiers for steps. */
	SongUtil::AdjustDuplicateSteps( this );

	{
		/* Generated filename; this doesn't always point to a loadable file,
		 * but instead points to the file we should write changed files to,
		 * and will always be a .SSC.
		 *
		 * This is a little tricky. We can't always use the song title directly,
		 * since it might contain characters we can't store in filenames. Two
		 * easy options: we could manually filter out invalid characters, or we
		 * could use the name of the directory, which is always a valid filename
		 * and should always be the same as the song. The former might not catch
		 * everything--filename restrictions are platform-specific; we might even
		 * be on an 8.3 filesystem, so let's do the latter.
		 *
		 * We can't rely on searching for other data filenames; it works for DWIs,
		 * but not KSFs and BMSs.
		 *
		 * So, let's do this (by priority):
		 * 1. If there's a .SSC file, use that filename. No reason to use anything
		 *    else; it's the filename in use.
		 * 2. If there's an .SM, use it with a changed extension.
		 * 3. If there's a .DWI, use it with a changed extension.
		 * 4. Otherwise, use the name of the directory, since it's definitely a valid
		 *    filename, and should always be the title of the song (unlike KSFs). */
		m_sSongFileName = m_sSongDir;
		vector<RString> asFileNames;
		do
		{
			GetDirListing( m_sSongDir+"*.ssc", asFileNames );
			if( !asFileNames.empty() )
			{
				m_sSongFileName += asFileNames[0];
				break;
			}
			
			GetDirListing( m_sSongDir+"*.sma", asFileNames );
			if (!asFileNames.empty() )
			{
				m_sSongFileName += SetExtension( asFileNames[0], "ssc" );
				break;
			}
			
			GetDirListing( m_sSongDir+"*.sm", asFileNames );
			if( !asFileNames.empty() )
			{
				m_sSongFileName += SetExtension( asFileNames[0], "ssc" );
				break;
			}
			
			GetDirListing( m_sSongDir+"*.dwi", asFileNames );
			if( !asFileNames.empty() ) {
				m_sSongFileName += SetExtension( asFileNames[0], "ssc" );
				break;
			}
			m_sSongFileName += Basename(m_sSongDir);
			m_sSongFileName += ".ssc";
		} while(0);
	}

	// If no time signature specified, assume 4/4 time for the whole song.
	if( m_Timing.m_vTimeSignatureSegments.empty() )
	{
		TimeSignatureSegment seg;
		seg.m_iStartRow = 0;
		seg.m_iNumerator = 4;
		seg.m_iDenominator = 4;
		m_Timing.m_vTimeSignatureSegments.push_back( seg );
	}
	
	/*
	 * Likewise, if no tickcount signature is specified, assume 2 ticks
	 * per beat for the entire song. The default of 2 is chosen more
	 * for compatibility with the Pump Pro series than anything else.
	 */
	if( m_Timing.m_TickcountSegments.empty() )
	{
		TickcountSegment seg;
		seg.m_iStartRow = 0;
		seg.m_iTicks = 2;
		m_Timing.m_TickcountSegments.push_back( seg );
	}
	
	// Have a default combo segment of one just in case.
	if( m_Timing.m_ComboSegments.empty() )
	{
		ComboSegment seg;
		seg.m_iStartRow = 0;
		seg.m_iCombo = 1;
		m_Timing.m_ComboSegments.push_back( seg );
	}
}

void Song::TranslateTitles()
{
	static TitleSubst tsub("Songs");

	TitleFields title;
	title.LoadFromStrings( m_sMainTitle, m_sSubTitle, m_sArtist, m_sMainTitleTranslit, m_sSubTitleTranslit, m_sArtistTranslit );
	tsub.Subst( title );
	title.SaveToStrings( m_sMainTitle, m_sSubTitle, m_sArtist, m_sMainTitleTranslit, m_sSubTitleTranslit, m_sArtistTranslit );
}

void Song::ReCalculateRadarValuesAndLastBeat()
{
	float fFirstBeat = FLT_MAX; // inf
	float fLastBeat = m_fSpecifiedLastBeat; // Make sure we're at least as long as the specified amount.

	for( unsigned i=0; i<m_vpSteps.size(); i++ )
	{
		Steps* pSteps = m_vpSteps[i];

		pSteps->CalculateRadarValues( m_fMusicLengthSeconds );

		// calculate lastBeat

		// If it's autogen, then first/last beat will come from the parent.
		if( pSteps->IsAutogen() )
			continue;

		/* Don't calculate with edits unless the song only contains an edit
		 * chart, like those in Mungyodance 3. Otherwise, edits installed on
		 * the machine could extend the length of the song. */
		if( pSteps->IsAnEdit() && m_vpSteps.size() > 1 )
			continue;

		// Don't set first/last beat based on lights.  They often start very 
		// early and end very late.
		if( pSteps->m_StepsType == StepsType_lights_cabinet )
			continue;

		NoteData tempNoteData;
		pSteps->GetNoteData( tempNoteData );

		/* Many songs have stray, empty song patterns. Ignore them, so they
		 * don't force the first beat of the whole song to 0. */
		if( tempNoteData.GetLastRow() == 0 )
			continue;

		fFirstBeat = min( fFirstBeat, tempNoteData.GetFirstBeat() );
		fLastBeat = max( fLastBeat, tempNoteData.GetLastBeat() );
	}

	m_fFirstBeat = fFirstBeat;
	m_fLastBeat = fLastBeat;
}

// Return whether the song is playable in the given style.
bool Song::SongCompleteForStyle( const Style *st ) const
{
	return HasStepsType( st->m_StepsType );
}

bool Song::HasStepsType( StepsType st ) const
{
	return SongUtil::GetOneSteps( this, st ) != NULL;
}

bool Song::HasStepsTypeAndDifficulty( StepsType st, Difficulty dc ) const
{
	return SongUtil::GetOneSteps( this, st, dc ) != NULL;
}

void Song::Save()
{
	LOG->Trace( "Song::SaveToSongFile()" );

	ReCalculateRadarValuesAndLastBeat();
	TranslateTitles();

	// Save the new files. These calls make backups on their own.
	if( !SaveToSSCFile(GetSongFilePath(), false) )
		return;
	SaveToSMFile();
	//SaveToDWIFile();
	SaveToCacheFile();

	/* We've safely written our files and created backups. Rename non-SM and
	 * non-DWI files to avoid confusion. */
	vector<RString> arrayOldFileNames;
	GetDirListing( m_sSongDir + "*.bms", arrayOldFileNames );
	GetDirListing( m_sSongDir + "*.pms", arrayOldFileNames );
	GetDirListing( m_sSongDir + "*.ksf", arrayOldFileNames );

	for( unsigned i=0; i<arrayOldFileNames.size(); i++ )
	{
		const RString sOldPath = m_sSongDir + arrayOldFileNames[i];
		const RString sNewPath = sOldPath + ".old";

		if( !FileCopy( sOldPath, sNewPath ) )
		{
			LOG->UserLog( "Song file", sOldPath, "couldn't be backed up." );
			// Don't remove.
		}
		else
			FILEMAN->Remove( sOldPath );
	}
}

bool Song::SaveToSMFile()
{
	const RString sPath = SetExtension( GetSongFilePath(), "sm" );
	LOG->Trace( "Song::SaveToSMFile(%s)", sPath.c_str() );
	
	// If the file exists, make a backup.
	if( IsAFile(sPath) )
		FileCopy( sPath, sPath + ".old" );
	return NotesWriterSM::Write( sPath, *this );

}

bool Song::SaveToSSCFile( RString sPath, bool bSavingCache )
{
	LOG->Trace( "Song::SaveToSSCFile('%s')", sPath.c_str() );

	// If the file exists, make a backup.
	if( !bSavingCache && IsAFile(sPath) )
		FileCopy( sPath, sPath + ".old" );

	vector<Steps*> vpStepsToSave;
	FOREACH_CONST( Steps*, m_vpSteps, s ) 
	{
		Steps *pSteps = *s;
		if( pSteps->IsAutogen() )
			continue; // don't write autogen notes

		// Only save steps that weren't loaded from a profile.
		if( pSteps->WasLoadedFromProfile() )
			continue;

		vpStepsToSave.push_back( pSteps );
	}

	if( !NotesWriterSSC::Write(sPath, *this, vpStepsToSave, bSavingCache) )
		return false;

	if( !bSavingCache && g_BackUpAllSongSaves.Get() )
	{
		RString sExt = GetExtension( sPath );
		RString sBackupFile = SetExtension( sPath, "" );

		time_t cur_time;
		time( &cur_time );
		struct tm now;
		localtime_r( &cur_time, &now );

		sBackupFile += ssprintf( "-%04i-%02i-%02i--%02i-%02i-%02i", 
			1900+now.tm_year, now.tm_mon+1, now.tm_mday, now.tm_hour, now.tm_min, now.tm_sec );
		sBackupFile = SetExtension( sBackupFile, sExt );
		sBackupFile += ssprintf( ".old" );

		if( FileCopy(sPath, sBackupFile) )
			LOG->Trace( "Backed up %s to %s", sPath.c_str(), sBackupFile.c_str() );
		else
			LOG->Trace( "Failed to back up %s to %s", sPath.c_str(), sBackupFile.c_str() );
	}

	if( !bSavingCache )
	{
		// Mark these steps saved to disk.
		FOREACH( Steps*, vpStepsToSave, s )
			(*s)->SetSavedToDisk( true );
	}

	return true;
}

bool Song::SaveToCacheFile()
{
	SONGINDEX->AddCacheIndex(m_sSongDir, GetHashForDirectory(m_sSongDir));
	const RString sPath = GetCacheFilePath();
	if( !SaveToSSCFile(sPath, true) )
		return false;

	FOREACH( Steps*, m_vpSteps, pSteps )
		(*pSteps)->SetFilename( sPath );

	return true;
}

bool Song::SaveToDWIFile()
{
	const RString sPath = SetExtension( GetSongFilePath(), "dwi" );
	LOG->Trace( "Song::SaveToDWIFile(%s)", sPath.c_str() );

	// If the file exists, make a backup.
	if( IsAFile(sPath) )
		FileCopy( sPath, sPath + ".old" );

	return NotesWriterDWI::Write( sPath, *this );
}


void Song::AddAutoGenNotes()
{
	bool HasNotes[NUM_StepsType];
	memset( HasNotes, 0, sizeof(HasNotes) );
	for( unsigned i=0; i < m_vpSteps.size(); i++ ) // foreach Steps
	{
		if( m_vpSteps[i]->IsAutogen() )
			continue;

		StepsType st = m_vpSteps[i]->m_StepsType;
		HasNotes[st] = true;
	}

	FOREACH_ENUM( StepsType, stMissing )
	{
		if( HasNotes[stMissing] )
			continue;

		// If m_bAutogenSteps is disabled, only autogen lights.
		if( !PREFSMAN->m_bAutogenSteps && stMissing != StepsType_lights_cabinet )
			continue;
		if( !GAMEMAN->GetStepsTypeInfo(stMissing).bAllowAutogen )
			continue;

		// missing Steps of this type
		int iNumTracksOfMissing = GAMEMAN->GetStepsTypeInfo(stMissing).iNumTracks;

		// look for closest match
		StepsType stBestMatch = StepsType_Invalid;
		int			iBestTrackDifference = INT_MAX;

		FOREACH_ENUM( StepsType, st )
		{
			if( !HasNotes[st] )
				continue;

			// has (non-autogen) Steps of this type
			const int iNumTracks = GAMEMAN->GetStepsTypeInfo(st).iNumTracks;
			const int iTrackDifference = abs(iNumTracks-iNumTracksOfMissing);
			if( iTrackDifference < iBestTrackDifference )
			{
				stBestMatch = st;
				iBestTrackDifference = iTrackDifference;
			}
		}

		if( stBestMatch != StepsType_Invalid )
			AutoGen( stMissing, stBestMatch );
	}
}

void Song::AutoGen( StepsType ntTo, StepsType ntFrom )
{
	// int iNumTracksOfTo = GAMEMAN->StepsTypeToNumTracks(ntTo);

	for( unsigned int j=0; j<m_vpSteps.size(); j++ )
	{
		const Steps* pOriginalNotes = m_vpSteps[j];
		if( pOriginalNotes->m_StepsType == ntFrom )
		{
			Steps* pNewNotes = new Steps;
			pNewNotes->AutogenFrom( pOriginalNotes, ntTo );
			this->AddSteps( pNewNotes );
		}
	}
}

void Song::RemoveAutoGenNotes()
{
	FOREACH_ENUM( StepsType, st )
	{
		for( int j=m_vpStepsByType[st].size()-1; j>=0; j-- )
		{
			if( m_vpStepsByType[st][j]->IsAutogen() )
			{
				// delete m_vpSteps[j]; // delete below
				m_vpStepsByType[st].erase( m_vpStepsByType[st].begin()+j );
			}
		}
	}

	for( int j=m_vpSteps.size()-1; j>=0; j-- )
	{
		if( m_vpSteps[j]->IsAutogen() )
		{
			delete m_vpSteps[j];
			m_vpSteps.erase( m_vpSteps.begin()+j );
		}
	}
}

bool Song::IsEasy( StepsType st ) const
{
	/* Very fast songs and songs with wide tempo changes are hard for new
	 * players, even if they have beginner steps. */
	DisplayBpms bpms;
	this->GetDisplayBpms(bpms);
	if( bpms.GetMax() >= 250 || bpms.GetMax() - bpms.GetMin() >= 75 )
		return false;

	/* The easy marker indicates which songs a beginner, having selected
	 * "beginner", can play and actually get a very easy song: if there are
	 * actual beginner steps, or if the light steps are 1- or 2-foot. */
	const Steps* pBeginnerNotes = SongUtil::GetStepsByDifficulty( this, st, Difficulty_Beginner );
	if( pBeginnerNotes )
		return true;

	const Steps* pEasyNotes = SongUtil::GetStepsByDifficulty( this, st, Difficulty_Easy );
	if( pEasyNotes && pEasyNotes->GetMeter() == 1 )
		return true;

	return false;
}

bool Song::IsTutorial() const
{
	// A Song is considered a Tutorial if it has only Beginner steps.
	FOREACH_CONST( Steps*, m_vpSteps, s )
	{
		if( (*s)->m_StepsType == StepsType_lights_cabinet )
			continue; // ignore
		if( (*s)->GetDifficulty() != Difficulty_Beginner )
			return false;
	}

	return true;
}

bool Song::HasEdits( StepsType st ) const
{
	for( unsigned i=0; i<m_vpSteps.size(); i++ )
	{
		Steps* pSteps = m_vpSteps[i];
		if( pSteps->m_StepsType == st &&
			pSteps->GetDifficulty() == Difficulty_Edit )
		{
			return true;
		}
	}

	return false;
}

/* Return false if the song should not be displayed for selection in normal
 * gameplay (but may still be available in random selection, during extra
 * stages, or in other special conditions). */
bool Song::NormallyDisplayed() const
{
	return UNLOCKMAN == NULL || !UNLOCKMAN->SongIsLocked(this);
}

bool Song::ShowInDemonstrationAndRanking() const { return !IsTutorial() && NormallyDisplayed(); }


// Hack: see Song::TidyUpData comments.
bool Song::HasMusic() const
{
	// If we have keys, we always have music.
	if( m_vsKeysoundFile.size() != 0 )
		return true;

	return m_sMusicFile != "" && IsAFile(GetMusicPath());
}
bool Song::HasBanner() const 		{return m_sBannerFile != ""		&& IsAFile(GetBannerPath()); }
bool Song::HasInstrumentTrack( InstrumentTrack it ) const
{
	return m_sInstrumentTrackFile[it] != ""  &&  IsAFile(GetInstrumentTrackPath(it));
}
bool Song::HasLyrics() const		{return m_sLyricsFile != ""		&& IsAFile(GetLyricsPath()); }
bool Song::HasBackground() const 	{return m_sBackgroundFile != ""		&& IsAFile(GetBackgroundPath()); }
bool Song::HasCDTitle() const 	{return m_sCDTitleFile != ""		&& IsAFile(GetCDTitlePath()); }
bool Song::HasBGChanges() const
{
	FOREACH_BackgroundLayer( i )
	{
		if( !GetBackgroundChanges(i).empty() )
			return true;
	}
	return false;
}
bool Song::HasAttacks() const		{return !m_Attacks.empty(); }
// todo: add checks for Jacket, Disc, and CDImage -aj

const vector<BackgroundChange> &Song::GetBackgroundChanges( BackgroundLayer bl ) const
{
	return *(m_BackgroundChanges[bl]);
}
vector<BackgroundChange> &Song::GetBackgroundChanges( BackgroundLayer bl )
{
	return *(m_BackgroundChanges[bl].Get());
}

const vector<BackgroundChange> &Song::GetForegroundChanges() const
{
	return *m_ForegroundChanges;
}
vector<BackgroundChange> &Song::GetForegroundChanges()
{
	return *m_ForegroundChanges.Get();
}


RString GetSongAssetPath( RString sPath, const RString &sSongPath )
{
	if( sPath == "" )
		return RString();

	/* If there's no path in the file, the file is in the same directory as the
	 * song. (This is the preferred configuration.) */
	if( sPath.find('/') == string::npos )
		return sSongPath+sPath;

	// The song contains a path; treat it as relative to the top SM directory.
	if( sPath.Left(3) == "../" )
	{
		// The path begins with "../".  Resolve it wrt. the song directory.
		sPath = sSongPath + sPath;
	}

	CollapsePath( sPath );

	/* If the path still begins with "../", then there were an unreasonable number
	 * of them at the beginning of the path. Ignore the path entirely. */
	if( sPath.Left(3) == "../" )
		return RString();

	return sPath;
}

/* Note that supplying a path relative to the top-level directory is only for
 * compatibility with DWI. We prefer paths relative to the song directory. */
RString Song::GetMusicPath() const
{
	return GetSongAssetPath( m_sMusicFile, m_sSongDir );
}

RString Song::GetInstrumentTrackPath( InstrumentTrack it ) const
{
	return GetSongAssetPath( m_sInstrumentTrackFile[it], m_sSongDir );
}

RString Song::GetBannerPath() const
{
	return GetSongAssetPath( m_sBannerFile, m_sSongDir );
}

RString Song::GetLyricsPath() const
{
	return GetSongAssetPath( m_sLyricsFile, m_sSongDir );
}

RString Song::GetCDTitlePath() const
{
	return GetSongAssetPath( m_sCDTitleFile, m_sSongDir );
}

RString Song::GetBackgroundPath() const
{
	return GetSongAssetPath( m_sBackgroundFile, m_sSongDir );
}

// todo: add checks for Jacket, Disc, and CDImage -aj

RString Song::GetDisplayMainTitle() const
{
	if(!PREFSMAN->m_bShowNativeLanguage) return GetTranslitMainTitle();
	return m_sMainTitle;
}

RString Song::GetDisplaySubTitle() const
{
	if(!PREFSMAN->m_bShowNativeLanguage) return GetTranslitSubTitle();
	return m_sSubTitle;
}

RString Song::GetDisplayArtist() const
{
	if(!PREFSMAN->m_bShowNativeLanguage) return GetTranslitArtist();
	return m_sArtist;
}

RString Song::GetDisplayFullTitle() const
{
	RString Title = GetDisplayMainTitle();
	RString SubTitle = GetDisplaySubTitle();

	if(!SubTitle.empty()) Title += " " + SubTitle;
	return Title;
}

RString Song::GetTranslitFullTitle() const
{
	RString Title = GetTranslitMainTitle();
	RString SubTitle = GetTranslitSubTitle();

	if(!SubTitle.empty()) Title += " " + SubTitle;
	return Title;
}

void Song::AddSteps( Steps* pSteps )
{
	m_vpSteps.push_back( pSteps );
	ASSERT_M( pSteps->m_StepsType < NUM_StepsType, ssprintf("%i", pSteps->m_StepsType) );
	m_vpStepsByType[pSteps->m_StepsType].push_back( pSteps );
}

void Song::DeleteSteps( const Steps* pSteps, bool bReAutoGen )
{
	ASSERT( !pSteps->IsAutogen() );

	// Avoid any stale Note::parent pointers by removing all AutoGen'd Steps,
	// then adding them again.

	if( bReAutoGen )
		RemoveAutoGenNotes();

	vector<Steps*> &vpSteps = m_vpStepsByType[pSteps->m_StepsType];
	for( int j=vpSteps.size()-1; j>=0; j-- )
	{
		if( vpSteps[j] == pSteps )
		{
			//delete vpSteps[j]; // delete below
			vpSteps.erase( vpSteps.begin()+j );
			break;
		}
	}

	for( int j=m_vpSteps.size()-1; j>=0; j-- )
	{
		if( m_vpSteps[j] == pSteps )
		{
			delete m_vpSteps[j];
			m_vpSteps.erase( m_vpSteps.begin()+j );
			break;
		}
	}

	if( bReAutoGen )
		AddAutoGenNotes();
}

bool Song::Matches(RString sGroup, RString sSong) const
{
	if( sGroup.size() && sGroup.CompareNoCase(this->m_sGroupName) != 0)
		return false;

	RString sDir = this->GetSongDir();
	sDir.Replace("\\","/");
	vector<RString> bits;
	split( sDir, "/", bits );
	ASSERT(bits.size() >= 2); // should always have at least two parts
	const RString &sLastBit = bits[bits.size()-1];

	// match on song dir or title (ala DWI)
	if( !sSong.CompareNoCase(sLastBit) )
		return true;
	if( !sSong.CompareNoCase(this->GetTranslitFullTitle()) )
		return true;

	return false;
}

/* If apInUse is set, it contains a list of steps which are in use elsewhere,
 * and should not be deleted. */
void Song::FreeAllLoadedFromProfile( ProfileSlot slot, const set<Steps*> *setInUse )
{
	/* DeleteSteps will remove and recreate autogen notes, which may reorder
	 * m_vpSteps, so be careful not to skip over entries. */
	vector<Steps*> apToRemove;
	for( int s=m_vpSteps.size()-1; s>=0; s-- )
	{
		Steps* pSteps = m_vpSteps[s];
		if( !pSteps->WasLoadedFromProfile() )
			continue;
		if( slot != ProfileSlot_Invalid && pSteps->GetLoadedFromProfileSlot() != slot )
			continue;
		if( setInUse != NULL && setInUse->find(pSteps) != setInUse->end() )
			continue;
		apToRemove.push_back( pSteps );
	}

	for( unsigned i = 0; i < apToRemove.size(); ++i )
		this->DeleteSteps( apToRemove[i] );
}

void Song::GetStepsLoadedFromProfile( ProfileSlot slot, vector<Steps*> &vpStepsOut ) const
{
	for( unsigned s=0; s<m_vpSteps.size(); s++ )
	{
		Steps* pSteps = m_vpSteps[s];
		if( pSteps->GetLoadedFromProfileSlot() == slot )
			vpStepsOut.push_back( pSteps );
	}
}

int Song::GetNumStepsLoadedFromProfile( ProfileSlot slot ) const
{
	int iCount = 0;
	for( unsigned s=0; s<m_vpSteps.size(); s++ )
	{
		Steps* pSteps = m_vpSteps[s];
		if( pSteps->GetLoadedFromProfileSlot() == slot )
			iCount++;
	}
	return iCount;
}

bool Song::IsEditAlreadyLoaded( Steps* pSteps ) const
{
	ASSERT( pSteps->GetDifficulty() == Difficulty_Edit );

	for( unsigned i=0; i<m_vpSteps.size(); i++ )
	{
		Steps* pOther = m_vpSteps[i];
		if( pOther->GetDifficulty() == Difficulty_Edit &&
			pOther->m_StepsType == pSteps->m_StepsType &&
			pOther->GetHash() == pSteps->GetHash() )
		{
			return true;
		}
	}

	return false;
}

bool Song::HasSignificantBpmChangesOrStops() const
{
	if( m_Timing.HasStops() )
		return true;

	// Don't consider BPM changes that only are only for maintaining sync as 
	// a real BpmChange.
	if( m_DisplayBPMType == DISPLAY_SPECIFIED )
	{
		if( m_fSpecifiedBPMMin != m_fSpecifiedBPMMax )
			return true;
	}
	else if( m_Timing.HasBpmChanges() )
	{
		return true;
	}

	return false;
}

float Song::GetStepsSeconds() const
{
	return GetElapsedTimeFromBeat( m_fLastBeat ) - GetElapsedTimeFromBeat( m_fFirstBeat );
}

bool Song::IsLong() const
{
	return !IsMarathon() && m_fMusicLengthSeconds > g_fLongVerSongSeconds;
}

bool Song::IsMarathon() const
{
	return m_fMusicLengthSeconds >= g_fMarathonVerSongSeconds;
}

// lua start
#include "LuaBinding.h"

/** @brief Allow Lua to have access to the Song. */ 
class LunaSong: public Luna<Song>
{
public:
	static int GetDisplayFullTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetDisplayFullTitle() ); return 1; }
	static int GetTranslitFullTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetTranslitFullTitle() ); return 1; }
	static int GetDisplayMainTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetDisplayMainTitle() ); return 1; }
	static int GetTranslitMainTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetTranslitMainTitle() ); return 1; }
	static int GetDisplaySubTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetDisplaySubTitle() ); return 1; }
	static int GetTranslitSubTitle( T* p, lua_State *L )	{ lua_pushstring(L, p->GetTranslitSubTitle() ); return 1; }
	static int GetDisplayArtist( T* p, lua_State *L )	{ lua_pushstring(L, p->GetDisplayArtist() ); return 1; }
	static int GetTranslitArtist( T* p, lua_State *L )	{ lua_pushstring(L, p->GetTranslitArtist() ); return 1; }
	static int GetGenre( T* p, lua_State *L )		{ lua_pushstring(L, p->m_sGenre ); return 1; }
	static int GetAllSteps( T* p, lua_State *L )
	{
		const vector<Steps*> &v = p->GetAllSteps();
		LuaHelpers::CreateTableFromArray<Steps*>( v, L );
		return 1;
	}
	static int GetStepsByStepsType( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		const vector<Steps*> &v = p->GetStepsByStepsType( st );
		LuaHelpers::CreateTableFromArray<Steps*>( v, L );
		return 1;
	}
	static int GetSongDir( T* p, lua_State *L )		{ lua_pushstring(L, p->GetSongDir() ); return 1; }
	static int GetMusicPath( T* p, lua_State *L )	{ RString s = p->GetMusicPath(); if( s.empty() ) return 0; lua_pushstring(L, s); return 1; }
	static int GetBannerPath( T* p, lua_State *L )		{ RString s = p->GetBannerPath(); if( s.empty() ) return 0; LuaHelpers::Push(L, s); return 1; }
	static int GetBackgroundPath( T* p, lua_State *L )	{ RString s = p->GetBackgroundPath(); if( s.empty() ) return 0; lua_pushstring(L, s); return 1; }
	static int GetCDTitlePath( T* p, lua_State *L )		{ RString s = p->GetCDTitlePath(); if( s.empty() ) return 0; LuaHelpers::Push(L, s); return 1; }
	static int GetLyricsPath( T* p, lua_State *L )	{ RString s = p->GetLyricsPath(); if( s.empty() ) return 0; lua_pushstring(L, s); return 1; }
	static int GetSongFilePath(  T* p, lua_State *L )	{ lua_pushstring(L, p->GetSongFilePath() ); return 1; }
	static int IsTutorial( T* p, lua_State *L )		{ lua_pushboolean(L, p->IsTutorial()); return 1; }
	static int IsEnabled( T* p, lua_State *L )		{ lua_pushboolean(L, p->GetEnabled()); return 1; }
	static int GetGroupName( T* p, lua_State *L )		{ lua_pushstring(L, p->m_sGroupName); return 1; }
	static int MusicLengthSeconds( T* p, lua_State *L )	{ lua_pushnumber(L, p->m_fMusicLengthSeconds); return 1; }
	static int IsLong( T* p, lua_State *L )			{ lua_pushboolean(L, p->IsLong()); return 1; }
	static int IsMarathon( T* p, lua_State *L )		{ lua_pushboolean(L, p->IsMarathon()); return 1; }
	static int HasStepsType( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		lua_pushboolean( L, p->HasStepsType(st) );
		return 1;
	}
	static int HasStepsTypeAndDifficulty( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		Difficulty dc = Enum::Check<Difficulty>( L, 2 );
		lua_pushboolean( L, p->HasStepsTypeAndDifficulty(st, dc) );
		return 1;
	}
	// TODO: HasStepsTypeAndDifficulty and GetOneSteps should be in a SongUtil Lua table and a method of Steps.
	static int GetOneSteps( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		Difficulty dc = Enum::Check<Difficulty>( L, 2 );
		Steps *pSteps = SongUtil::GetOneSteps( p, st, dc );
		if( pSteps ) 
			pSteps->PushSelf(L);
		else 
			lua_pushnil(L);
		return 1;
	}
	static int GetTimingData( T* p, lua_State *L )
	{
		p->m_Timing.PushSelf(L);
		return 1;
	}
	// has functions
	static int HasMusic( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasMusic()); return 1; }
	static int HasBanner( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasBanner()); return 1; }
	static int HasBackground( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasBackground()); return 1; }
	static int HasCDTitle( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasCDTitle()); return 1; }
	static int HasBGChanges( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasBGChanges()); return 1; }
	static int HasLyrics( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasLyrics()); return 1; }
	// functions that AJ loves
	static int HasSignificantBPMChangesOrStops( T* p, lua_State *L )	{ lua_pushboolean(L, p->HasSignificantBpmChangesOrStops()); return 1; }
	static int HasEdits( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		lua_pushboolean(L, p->HasEdits( st ));
		return 1;
	}
	static int IsEasy( T* p, lua_State *L )
	{
		StepsType st = Enum::Check<StepsType>(L, 1);
		lua_pushboolean(L, p->IsEasy( st ));
		return 1;
	}
	static int GetStepsSeconds( T* p, lua_State *L )	{ lua_pushnumber(L, p->GetStepsSeconds()); return 1; }
	static int NormallyDisplayed( T* p, lua_State *L ){ lua_pushboolean(L, p->NormallyDisplayed()); return 1; }
	static int GetFirstBeat( T* p, lua_State *L )	{ lua_pushnumber(L, p->m_fFirstBeat); return 1; }
	static int GetLastBeat( T* p, lua_State *L )	{ lua_pushnumber(L, p->m_fLastBeat); return 1; }
	static int HasAttacks( T* p, lua_State *L )		{ lua_pushboolean(L, p->HasAttacks()); return 1; }
	static int GetDisplayBpms( T* p, lua_State *L )
	{
		DisplayBpms temp;
		p->GetDisplayBpms(temp);
		float fMin = temp.GetMin();
		float fMax = temp.GetMax();
		vector<float> fBPMs;
		fBPMs.push_back( fMin );
		fBPMs.push_back( fMax );
		LuaHelpers::CreateTableFromArray(fBPMs, L);
		return 1;
	}
	static int IsDisplayBpmSecret( T* p, lua_State *L )
	{
		DisplayBpms temp;
		p->GetDisplayBpms(temp);
		lua_pushboolean( L, temp.IsSecret() );
		return 1;
	}
	static int IsDisplayBpmConstant( T* p, lua_State *L )
	{
		DisplayBpms temp;
		p->GetDisplayBpms(temp);
		lua_pushboolean( L, temp.BpmIsConstant() );
		return 1;
	}
	static int IsDisplayBpmRandom( T* p, lua_State *L )
	{
		lua_pushboolean( L, p->m_DisplayBPMType == Song::DISPLAY_RANDOM );
		return 1;
	}

	LunaSong()
	{
		ADD_METHOD( GetDisplayFullTitle );
		ADD_METHOD( GetTranslitFullTitle );
		ADD_METHOD( GetDisplayMainTitle );
		ADD_METHOD( GetTranslitMainTitle );
		ADD_METHOD( GetDisplaySubTitle );
		ADD_METHOD( GetTranslitSubTitle );
		ADD_METHOD( GetDisplayArtist );
		ADD_METHOD( GetTranslitArtist );
		ADD_METHOD( GetGenre );
		ADD_METHOD( GetAllSteps );
		ADD_METHOD( GetStepsByStepsType );
		ADD_METHOD( GetSongDir );
		ADD_METHOD( GetMusicPath );
		ADD_METHOD( GetBannerPath );
		ADD_METHOD( GetBackgroundPath );
		ADD_METHOD( GetCDTitlePath );
		ADD_METHOD( GetLyricsPath );
		ADD_METHOD( GetSongFilePath );
		ADD_METHOD( IsTutorial );
		ADD_METHOD( IsEnabled );
		ADD_METHOD( GetGroupName );
		ADD_METHOD( MusicLengthSeconds );
		ADD_METHOD( IsLong );
		ADD_METHOD( IsMarathon );
		ADD_METHOD( HasStepsType );
		ADD_METHOD( HasStepsTypeAndDifficulty );
		ADD_METHOD( GetOneSteps );
		ADD_METHOD( GetTimingData );
		ADD_METHOD( HasMusic );
		ADD_METHOD( HasBanner );
		ADD_METHOD( HasBackground );
		ADD_METHOD( HasCDTitle );
		ADD_METHOD( HasBGChanges );
		ADD_METHOD( HasLyrics );
		ADD_METHOD( HasSignificantBPMChangesOrStops );
		ADD_METHOD( HasEdits );
		ADD_METHOD( IsEasy );
		ADD_METHOD( GetStepsSeconds );
		ADD_METHOD( NormallyDisplayed );
		ADD_METHOD( GetFirstBeat );
		ADD_METHOD( GetLastBeat );
		ADD_METHOD( HasAttacks );
		ADD_METHOD( GetDisplayBpms );
		ADD_METHOD( IsDisplayBpmSecret );
		ADD_METHOD( IsDisplayBpmConstant );
		ADD_METHOD( IsDisplayBpmRandom );
	}   
};

LUA_REGISTER_CLASS( Song )
// lua end


/*
 * (c) 2001-2004 Chris Danford, Glenn Maynard
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */