GroovePlayer.cpp

/*
 * Copyright (C) 2017  Kevin Whitaker <eyecreate@gmail.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include "GroovePlayer.h"
#include "db/UserAction.h"
#include <Wt/WLogger>
#include <Wt/WServer>
#include <Wt/WApplication>
#include "WebInterface.h"
#include <locale>
#include <Wt/WLogger>
#include <Wt/Dbo/Transaction>
#include <Wt/WDateTime>
#include <groovefingerprinter/fingerprinter.h>
#include <grooveplayer/player.h>
#include <taglib/fileref.h>
#include <taglib/mpegfile.h>
#include <taglib/id3v2tag.h>
#include <taglib/attachedpictureframe.h>

GroovePlayerMgr::GroovePlayerMgr (std::string dbFile)
{
    sqliteConnection = new Wt::Dbo::backend::Sqlite3(dbFile);
    connectionPool = new Wt::Dbo::FixedSqlConnectionPool(sqliteConnection, 3);
    musicScanDir = std::filesystem::current_path()/"music";
    Wt::Dbo::Session sqlSession;
    sqlSession.setConnectionPool(*connectionPool);
    sqlSession.mapClass<User>("user");
    sqlSession.mapClass<AudioTrack>("tracks");
    sqlSession.mapClass<UserAction>("actions");
    try
    {
        sqlSession.createTables();
    } catch(Wt::Dbo::Exception e) 
    {
        Wt::log("info") << "Using Existing DB.";
    }
    
    groove_init();

    grooveAudioScanner = new std::thread([this](){grooveAudioScannerLoop();});
    grooveEvents = new std::thread([this](){grooveEventLoop();});

}

GroovePlayerMgr::~GroovePlayerMgr()
{
    delete connectionPool;
}

std::list<AudioTrack> GroovePlayerMgr::getNextVoteBatch(Wt::Dbo::Session* session)
{
    /**
     * This method will attempt to pick 3 tracks that will be up for selection next.
     * 
     * The first track should be from the same album or artist.
     * The second track should be from the same genre.
     * The third track should be from something in a different genre.
     * 
     * What is picked inside those requirements is a mix of random and TODO:based on past user actions(33% of time).
     * 
     * The third track will be replaced by a recent request item if one exists.
     */
    
    std::list<AudioTrack> selectedTracks;
    
    Wt::Dbo::Transaction transaction(*session);
    //First make sure there are at least 3 tracks to suggest. 
    int trackCount = session->query<int>("select count(fingerprint) from tracks");
    if(trackCount < 3)
    {
        //Return empty list to show there are not enough tracks to allow voting.
        return selectedTracks;
    }
    
    //Determine first track
    int trackAlbumCount = session->query<int>("select count(fingerprint) from tracks").where("album = ?").bind(currentTrack.trackAlbumName);
    int trackArtistCount = session->query<int>("select count(fingerprint) from tracks").where("artist = ?").bind(currentTrack.trackArtistName);
    int computerSlightOfHand = rand() % 10 + 1;
    if(trackAlbumCount > 0 && ((computerSlightOfHand > 3 && trackAlbumCount > 1) || (computerSlightOfHand > 3 && trackAlbumCount == 1 && trackArtistCount == 1) || !(trackArtistCount > 1 && trackAlbumCount == 1)))
    {
        //Pick item from album
        Wt::Dbo::ptr<AudioTrack> eligibleTrack = session->find<AudioTrack>().where("album = ?").limit(1).offset(rand() % trackAlbumCount).bind(currentTrack.trackAlbumName);
        //Try to make sure the same track isn't up to vote again.
        if((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint && trackAlbumCount > 1)
        {
            while((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint)
            {
                eligibleTrack = session->find<AudioTrack>().where("album = ?").limit(1).offset(rand() % trackAlbumCount).bind(currentTrack.trackAlbumName);
            }
        }
        AudioTrack selected = *eligibleTrack;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    else
    {
        //Pick item from artist
        Wt::Dbo::ptr<AudioTrack> eligibleTrack = session->find<AudioTrack>().where("artist = ?").limit(1).offset(rand() % trackArtistCount).bind(currentTrack.trackArtistName);
        //Try to make sure the same track isn't up to vote again.
        if((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint && trackArtistCount > 1)
        {
            while((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint)
            {
                eligibleTrack = session->find<AudioTrack>().where("artist = ?").limit(1).offset(rand() % trackArtistCount).bind(currentTrack.trackArtistName);
            }
        }
        AudioTrack selected = *eligibleTrack;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    
    //Determine second track
    int trackGenreCount = session->query<int>("select count(fingerprint) from tracks").where("genre = ?").bind(currentTrack.trackGenre);
    if(trackGenreCount > 0)
    {
        //Pick item from genre
        Wt::Dbo::ptr<AudioTrack> eligibleTrack = session->find<AudioTrack>().where("genre = ?").limit(1).offset(rand() % trackGenreCount).bind(currentTrack.trackGenre);
        //Try to make sure same track isn't up to vote again and isn't the same as first votable track.
        if(((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint || (*eligibleTrack).trackFingerprint == selectedTracks.front().trackFingerprint) && trackGenreCount > 2)
        {
            while((*eligibleTrack).trackFingerprint == currentTrack.trackFingerprint || (*eligibleTrack).trackFingerprint == selectedTracks.front().trackFingerprint)
            {
                eligibleTrack = session->find<AudioTrack>().where("genre = ?").limit(1).offset(rand() % trackGenreCount).bind(currentTrack.trackGenre);
            }
        }
        AudioTrack selected = *eligibleTrack;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    
    //Determine third track
    int trackNotGenreCount = session->query<int>("select count(fingerprint) from tracks").where("genre != ?").bind(currentTrack.trackGenre);
    if(requestQueue.size() > 0)
    {
        //There's a request. Pick one up front and put as third item.
        AudioTrack selected = requestQueue.front().first;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    else if(trackNotGenreCount > 0)
    {
        //Pick from other genre
        Wt::Dbo::ptr<AudioTrack> eligibleTrack = session->find<AudioTrack>().where("genre != ?").limit(1).offset(rand() % trackNotGenreCount).bind(currentTrack.trackGenre);
        AudioTrack selected = *eligibleTrack;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    else
    {
        //Pick randomly
        Wt::Dbo::ptr<AudioTrack> eligibleTrack = session->find<AudioTrack>().limit(1).offset(rand() % trackCount);
        AudioTrack selected = *eligibleTrack;
        getPictureFromTrack(&selected);
        selectedTracks.push_back(selected);
    }
    transaction.commit();
    Wt::log("info") << "Next set of tracks to vote picked: 1=>[" << (*selectedTracks.begin()).trackName << "] 2=>[" << (*std::next(selectedTracks.begin(),1)).trackName << "] 3=>[" << (*std::next(selectedTracks.begin(),2)).trackName << "]";
    return selectedTracks;
}

void GroovePlayerMgr::grooveEventLoop()
{
    /**
     * On first boot, random track that has been voted before will start(or random if no track has been played before).
     * When voting ends, if no vote was cast, the first will be picked 50% of the time with second being 30% of the time and third being picked 20% of the time.
     * Exception is if third track is the top request, then it is picked. If another song is voted over this, it will be put in back of request queue.
     */
    
    Wt::Dbo::Session sqlSession;
    sqlSession.setConnectionPool(*connectionPool);
    sqlSession.mapClass<User>("user");
    sqlSession.mapClass<AudioTrack>("tracks");
    sqlSession.mapClass<UserAction>("actions");
    
    Wt::Dbo::Transaction transaction(sqlSession);
    int trackCount = sqlSession.query<int>("select count(fingerprint) from tracks");
    transaction.commit();
    
    //Wait until at least 3 tracks are in DB to prevent nothing to vote on.
    if(trackCount < 3)
    {
        while(trackCount < 3)
        {
            Wt::Dbo::Transaction transaction(sqlSession);
            trackCount = sqlSession.query<int>("select count(fingerprint) from tracks");
            transaction.commit();
            std::this_thread::sleep_for(std::chrono::milliseconds(500));
        }
    }
    
    Wt::Dbo::Transaction bootTransaction(sqlSession);

    //Pick initial track to bootstrap.
    int tracksPlayedBefore = sqlSession.query<int>("select count(fingerprint) from tracks as t join actions on (actions.action = 3 or actions.action = 2) and actions.track_id = t.id");
    AudioTrack selectedTrack;
    if (tracksPlayedBefore > 0)
    {
        selectedTrack = *sqlSession.query<Wt::Dbo::ptr<AudioTrack>>("select t from tracks as t join actions on (actions.action = 3 or actions.action = 2) and actions.track_id = t.id").limit(1).offset(rand() % tracksPlayedBefore).resultValue();
    }
    else
    {
        int trackCount = sqlSession.query<int>("select count(fingerprint) from tracks");
        selectedTrack = *sqlSession.find<AudioTrack>().limit(1).offset(rand() % trackCount).resultValue();
    }
    bootTransaction.commit();
    
    struct GroovePlaylist* playlist = groove_playlist_create();
    currentPlaylist = playlist;
    struct GroovePlayer* player = groove_player_create();
    if(!player) {return;}
    currentPlayer = player;
    currentRPG = groove_loudness_detector_create();
    currentRPG->disable_album = 1;
    currentRPG->info_queue_size = 1;
    
    groove_playlist_insert(playlist, groove_file_open(selectedTrack.trackPath.c_str()),1.0,1.0,nullptr);
    
    //Now boostrap player with initial data
    //groove_loudness_detector_attach(currentRPG,playlist);
    groove_player_attach(player, playlist);
    groove_playlist_play(playlist);
    
    //Now start loop
    while(getInstance()->continueEventLoop)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(200));
        PlayerEvent event = getNextPlayerEvent(&sqlSession);
        if(event.eventType == NOTHING)
        {
            continue;
        }
        else if(event.eventType == GROOVE_NOWPLAYING)
        {
            //Clean up playlist if more than 4
            if(groove_playlist_count(playlist) > 4)
            {
                groove_file_close(currentPlaylist->head->file);
                groove_playlist_remove(currentPlaylist,currentPlaylist->head);
            }
            //clean up state
            currentSkipRequester.clear();
            currentTrack = getCurrentTrackDB(&sqlSession);
            getPictureFromTrack(&currentTrack);
            //Pick new batch of tracks to vote on and inform UI of update.
            currentVoteBatch = getNextVoteBatch(&sqlSession);
            currentVoteStatus = std::list<std::pair<AudioTrack, int>>();
            currentUsersVoted.clear();
            for(auto track : currentVoteBatch)
            {
                currentVoteStatus.push_back(std::pair<AudioTrack, int>(track,0));
            }
            Wt::WServer::instance()->postAll([&]() {
                Wt::WApplication* app = Wt::WApplication::instance();
                if(app != nullptr)
                    {
                        static_cast<WebInterface*>(app)->songChangedFromServer(currentTrack);
                        static_cast<WebInterface*>(app)->voteTracksUpdatedFromServer(currentVoteBatch);
                    }
            }
            );
            Wt::log("info") << "Track playing changed to: " << currentTrack.trackName;
            //Make sure gain is suggested
//             struct GrooveLoudnessDetectorInfo info;
//             groove_loudness_detector_info_get(currentRPG,&info,1);
//             struct GroovePlaylistItem* item;
//             groove_player_position(currentPlayer,&item,nullptr);
//             groove_playlist_set_item_gain(currentPlaylist, item, clamp_rg(-18.0 - info.loudness));
//             groove_playlist_set_item_peak(currentPlaylist, item, info.peak);
//             Wt::log("info") << "Gain being set to:" << clamp_rg(-18.0 - info.loudness) << " and peak to:" << info.peak;
        }
        else if(event.eventType == VOTING_ENDED)
        {
            //Look at votes and add correct track to end of playlist.
            //If more than one track has highest votes, pick random. TODO:maybe base off of other play data instead.
            
            std::list<std::pair<AudioTrack,int>> trackWinners;
            for(auto track : currentVoteStatus)
            {
                //There nothing yet and there was at least a vote is an initial winner.
                if(trackWinners.size() == 0 && track.second > 0)
                {
                    trackWinners.push_back(track);
                    continue;
                }
                //If there is a winner. Check if higher. If so, clear the list and add this one. If equal, add to list.
                if(trackWinners.size() > 0)
                {
                    if(trackWinners.front().second < track.second)
                    {
                        trackWinners.clear();
                        trackWinners.push_back(std::pair<AudioTrack,int>(track.first, track.second));
                    }
                    else if(trackWinners.front().second == track.second)
                    {
                        trackWinners.push_back(std::pair<AudioTrack, int>(track.first, track.second));
                    }
                }
            }
            
            AudioTrack winner;
            //Randomly pick from winners(in case of tie), if there are any.
            if(trackWinners.size() > 0)
            {
                auto iter = trackWinners.begin();
                std::advance(iter,rand() % trackWinners.size());
                winner = (*iter).first;
                
                //Deal with requests if there are any.
                if(requestQueue.size() > 0)
                {
                    //If winning track was a request, now you can remove it from request queue.
                    if(requestQueue.front().first.trackFingerprint == winner.trackFingerprint)
                    {
                        requestQueue.pop_front();
                    }
                    //Request didn't win. Put request at bottom of queue.
                    else
                    {
                        requestQueue.push_back(requestQueue.front());
                        requestQueue.pop_front();
                    }
                }
            }
            else
            {
                //Pick request song if there are any.
                if(requestQueue.size() > 0 && requestQueue.front().first.trackFingerprint == currentVoteBatch.back().trackFingerprint) //Assumes back is track 3.
                {
                    winner = requestQueue.front().first;
                    requestQueue.pop_front();
                } 
                else
                {
                    //Pick based on percentages.
                    int pick = rand() % 10 +1;
                    if(pick <= 5 && currentVoteBatch.front().trackFingerprint != currentTrack.trackFingerprint)
                    {
                        //First track wins
                        winner = currentVoteBatch.front();
                    }
                    else if(pick <= 8 && (*std::next(currentVoteBatch.begin(),1)).trackFingerprint != currentTrack.trackFingerprint)
                    {
                        //Second track wins.
                        winner = (*std::next(currentVoteBatch.begin(),1));
                    }
                    else
                    {
                        //Third track wins
                        winner = (*std::next(currentVoteBatch.begin(),2));
                    }
                }
            }
            groove_playlist_insert(currentPlaylist,groove_file_open(winner.trackPath.c_str()),1.0,1.0,nullptr);
            Wt::WServer::instance()->postAll([winner]() {
                Wt::WApplication* app = Wt::WApplication::instance();
                if(app != nullptr)
                    {
                        static_cast<WebInterface*>(app)->voteNextPollClosedFromServer(winner);
                    }
            }
            );
            Wt::log("info")<< "Voting has ended. Next track is: " << winner.trackName;
        }
        else if(event.eventType == VOTE_CAST)
        {
            if(!voteEndedButNotNextTrackYet)
            {
                //Add vote to DB
                Wt::Dbo::Transaction voteTransaction(sqlSession);
                UserAction* action = new UserAction();
                action->action = UserAction::UAction::VoteTrack;
                action->user = sqlSession.find<User>().where("username = ?").bind(event.userInvolved.username);
                action->trackInvolved = sqlSession.find<AudioTrack>().where("fingerprint = ?").bind(event.tracksInvolved.front().trackFingerprint);
                action->datetime = Wt::WDateTime::currentDateTime();
                sqlSession.add(action);
                voteTransaction.commit();
                
                //Add vote to vote status
                for(auto voteItem = currentVoteStatus.begin(); voteItem != currentVoteStatus.end(); voteItem++)
                {
                    if(voteItem->first.trackFingerprint == event.tracksInvolved.front().trackFingerprint) 
                    {
                        std::pair<AudioTrack,int> newItem = (*voteItem);
                        newItem.second = ++(newItem.second);
                        currentVoteStatus.insert(currentVoteStatus.erase(voteItem),newItem);
                        currentUsersVoted.push_back(event.userInvolved);
                        break;
                    }
                }
                
                //Update vote display on all clients.
                Wt::WServer::instance()->postAll([event]() {
                Wt::WApplication* app = Wt::WApplication::instance();
                if(app != nullptr)
                    {
                        static_cast<WebInterface*>(app)->voteNextSongFromServer(event.userInvolved, event.tracksInvolved.front());
                    }
                }
                );
            }
        }
        else if(event.eventType == PLAYING_PAUSED)
        {
            //Add action to DB
            Wt::Dbo::Transaction pauseTransaction(sqlSession);
            UserAction* action = new UserAction();
            action->action = UserAction::UAction::PlayPause;
            action->user = sqlSession.find<User>().where("username = ?").bind(event.userInvolved.username);
            action->trackInvolved = sqlSession.find<AudioTrack>().where("fingerprint = ?").bind(event.tracksInvolved.front().trackFingerprint);
            action->datetime = Wt::WDateTime::currentDateTime();
            sqlSession.add(action);
            pauseTransaction.commit();

            groove_playlist_pause(currentPlaylist);
            
            //Update vote display on all clients.
            Wt::WServer::instance()->postAll([event]() {
                Wt::WApplication* app = Wt::WApplication::instance();
                if(app != nullptr)
                {
                    static_cast<WebInterface*>(app)->playPauseActionFromServer(event.userInvolved, true);
                }
            }
            );
        }
        else if(event.eventType == PLAYING_RESUMED)
        {
            //Add action to DB
            Wt::Dbo::Transaction playTransaction(sqlSession);
            UserAction* action = new UserAction();
            action->action = UserAction::UAction::PlayPause;
            action->user = sqlSession.find<User>().where("username = ?").bind(event.userInvolved.username);
            action->trackInvolved = sqlSession.find<AudioTrack>().where("fingerprint = ?").bind(event.tracksInvolved.front().trackFingerprint);
            action->datetime = Wt::WDateTime::currentDateTime();
            sqlSession.add(action);
            playTransaction.commit();

            groove_playlist_play(currentPlaylist);
            
            //Update vote display on all clients.
            Wt::WServer::instance()->postAll([event]() {
                Wt::WApplication* app = Wt::WApplication::instance();
                if(app != nullptr)
                {
                    static_cast<WebInterface*>(app)->playPauseActionFromServer(event.userInvolved, false);
                }
            }
            );
        }
        else if(event.eventType == SKIP_REQUESTED)
        {
            if(!voteEndedButNotNextTrackYet)
            {
                currentSkipRequester.push_back(event.userInvolved);
                skipRequestedAt = std::chrono::steady_clock::now();
                
                Wt::Dbo::Transaction skipTransaction(sqlSession);
                UserAction* action = new UserAction();
                action->action = UserAction::UAction::RequestSkip;
                action->user = sqlSession.find<User>().where("username = ?").bind(event.userInvolved.username);
                action->trackInvolved = sqlSession.find<AudioTrack>().where("fingerprint = ?").bind(event.tracksInvolved.front().trackFingerprint);
                action->datetime = Wt::WDateTime::currentDateTime();
                sqlSession.add(action);
                skipTransaction.commit();
                
                //Display skip request on all clients.
                Wt::WServer::instance()->postAll([event]() {
                    Wt::WApplication* app = Wt::WApplication::instance();
                    if(app != nullptr)
                    {
                        static_cast<WebInterface*>(app)->skipVotedFromServer(event.userInvolved);
                    }
                }
                );
            }
        }
        else if(event.eventType == SKIP_VOTE_CAST_AGAINST)
        {
            if(!voteEndedButNotNextTrackYet)
            {
                currentSkipRequester.clear();
                
                //Display skip request on all clients.
                Wt::WServer::instance()->postAll([event]() {
                    Wt::WApplication* app = Wt::WApplication::instance();
                    if(app != nullptr)
                    {
                        static_cast<WebInterface*>(app)->skipVoteUpdateFromServer(event.userInvolved, false);
                    }
                }
                );
            }
        }
        else if(event.eventType == SKIP_VOTING_ENDED)
        {
            //Don't skip without first determining next track
            if(!voteEndedButNotNextTrackYet)
            {
                voteEndedButNotNextTrackYet = true;
                lastInternalEvents.push_front(PlayerEvent() = {PlayerEventType::SKIP_VOTING_ENDED});
                lastInternalEvents.push_front(PlayerEvent() = {PlayerEventType::VOTING_ENDED});
            }
            else
            {
                GroovePlaylistItem* item;
                groove_player_position(currentPlayer,&item,nullptr);
                groove_playlist_seek(currentPlaylist, item->next, 0.0);
            }
        }
        else if(event.eventType == ADMIN_FORCE_SKIP)
        {
            if(!voteEndedButNotNextTrackYet)
            {
                lastInternalEvents.push_front(PlayerEvent() = {PlayerEventType::SKIP_VOTING_ENDED});
            }
        }
    }
    
    currentPlaylist = nullptr;
    currentPlayer = nullptr;
    groove_player_detach(player);
    groove_player_destroy(player);
    //groove_loudness_detector_detach(currentRPG);
    groove_loudness_detector_destroy(currentRPG);
    groove_playlist_destroy(playlist);
}

void GroovePlayerMgr::shutdown()
{
    continueEventLoop = false;
}

GroovePlayerMgr::PlayerEvent GroovePlayerMgr::getNextPlayerEvent(Wt::Dbo::Session* session)
{
    double timeIntoTrack;
    groove_player_position(currentPlayer,nullptr,&timeIntoTrack);
    if(!voteEndedButNotNextTrackYet && currentTrack.trackName != std::string() && currentTrack.trackLengthSeconds-timeIntoTrack < 3)
    {
        voteEndedButNotNextTrackYet = true;
        return PlayerEvent() = {PlayerEventType::VOTING_ENDED};
    }
    GroovePlayerEvent event;
    if(groove_player_event_get(this->currentPlayer,&event, 0) > 0)
    {
        if(event.type == GROOVE_EVENT_NOWPLAYING)
        {
            voteEndedButNotNextTrackYet = false;
            return PlayerEvent() = {PlayerEventType::GROOVE_NOWPLAYING};
        }
    }
    if(!voteEndedButNotNextTrackYet && currentSkipRequester.size() > 0 && skipRequestedAt+std::chrono::seconds(10) < std::chrono::steady_clock::now())
    {
        //Skip succeeded. Time to skip song.
        lastInternalEvents.push_front(PlayerEvent() = {PlayerEventType::SKIP_VOTING_ENDED});
    }
    if(lastInternalEvents.size() > 0)
    {
        PlayerEvent event = lastInternalEvents.front();
        lastInternalEvents.pop_front();
        return event;
    }
    return PlayerEvent() = {PlayerEventType::NOTHING};
}

AudioTrack GroovePlayerMgr::getCurrentTrackDB(Wt::Dbo::Session* session)
{
    Wt::Dbo::Transaction transaction(*session);
    GroovePlaylistItem* currentItem;
    groove_player_position(this->currentPlayer,&currentItem,nullptr);
    if(currentItem != nullptr)
    {
        AudioTrack track = *session->find<AudioTrack>().where("path = ?").bind(currentItem->file->filename).resultValue();
        transaction.commit();
        return track;
    }
    transaction.commit();
    return AudioTrack();
}


GroovePlayerMgr::ScanResults GroovePlayerMgr::addFileToTrackDBIfTagged(Wt::Dbo::Session* session, std::filesystem::path file)
{
    //Make sure file matches file type
    std::string extensionLowered;
    for(auto elem : file.extension().string())
    {
        extensionLowered.push_back(std::tolower(elem));
    }
    if(extensionLowered != ".mp3")
    {
        return ScanResults::WRONG_FILETYPE;
    }
    //Now check if tags exist and put into DB.
    struct GrooveFile* gfile = groove_file_open(file.c_str());
    struct GrooveTag* artist_tag = groove_file_metadata_get(gfile, "artist", nullptr, 0);
    struct GrooveTag* album_tag = groove_file_metadata_get(gfile, "album", nullptr, 0);
    struct GrooveTag* name_tag = groove_file_metadata_get(gfile, "title", nullptr, 0);
    struct GrooveTag* genre_tag = groove_file_metadata_get(gfile, "genre", nullptr, 0);
    if(artist_tag == nullptr || album_tag == nullptr || name_tag == nullptr || genre_tag == nullptr)
    {
        //Only accept song with all metadata for DB.
        Wt::log("info") << "Audio track " << file << " did not have all required tags.";
        groove_file_close(gfile);
        if(artist_tag == nullptr && album_tag != nullptr && name_tag != nullptr && genre_tag != nullptr) return ScanResults::MISSING_ARTIST_TAG;
        if(artist_tag != nullptr && album_tag == nullptr && name_tag == nullptr && genre_tag == nullptr) return ScanResults::MISSING_ALBUM_TAG;
        if(artist_tag != nullptr && album_tag != nullptr && name_tag == nullptr && genre_tag != nullptr) return ScanResults::MISSING_TITLE_TAG;
        if(artist_tag != nullptr && album_tag != nullptr && name_tag != nullptr && genre_tag == nullptr) return ScanResults::MISSING_GENRE_TAG;
        return ScanResults::MISSING_MULTIPLE_TAGS;
    }
    
    //Take fingerprint and compare to DB.
    struct GrooveFingerprinter* fingerprinter = groove_fingerprinter_create();
    struct GrooveFingerprinterInfo info;
    struct GroovePlaylist* playlist = groove_playlist_create();
    groove_playlist_insert(playlist,gfile,1.0,1.0,nullptr);
    groove_fingerprinter_attach(fingerprinter, playlist);
    groove_fingerprinter_info_get(fingerprinter, &info, 1);
    double trackLen = info.duration;
    char* encodedFP;
    groove_fingerprinter_encode(info.fingerprint,info.fingerprint_size,&encodedFP);
    std::string fingerprint = std::string(encodedFP);
    groove_fingerprinter_dealloc(encodedFP);
    groove_fingerprinter_free_info(&info);
    groove_fingerprinter_detach(fingerprinter);
    groove_fingerprinter_destroy(fingerprinter);
    groove_playlist_destroy(playlist);
    
    Wt::Dbo::Transaction transaction(*session);
    int existing = session->query<int>("select count(fingerprint) from tracks").where("fingerprint = ?").bind(fingerprint);
    if(existing >0)
    {
        //This track has a duplicate already.
        groove_file_close(gfile);
        return ScanResults::DUPLICATE_TRACK;
    }
    
    //Add to DB.
    AudioTrack* newTrack = new AudioTrack();
    newTrack->trackName = groove_tag_value(name_tag);
    newTrack->trackAlbumName = groove_tag_value(album_tag);
    newTrack->trackArtistName = groove_tag_value(artist_tag);
    newTrack->trackGenre = groove_tag_value(genre_tag);
    newTrack->trackLengthSeconds = trackLen;
    newTrack->trackFingerprint = fingerprint;
    newTrack->trackPath = file.string();
    
    //Quickly see if there is cover artist
    getPictureFromTrack(newTrack);
    if(newTrack->coverArt.size() == 0)
    {
        Wt::log("info") << "Audio track " << newTrack->trackPath << " did not have cover art in the file.";
        groove_file_close(gfile);
        return ScanResults::MISSING_COVERART_TAG;
    }
    
    session->add(newTrack);
    transaction.commit();
    groove_file_close(gfile);
    return ScanResults::ACCEPTED;
}

void GroovePlayerMgr::removeOrphanedTracks(Wt::Dbo::Session* session)
{
    Wt::Dbo::Transaction transaction(*session);
    Wt::Dbo::collection<Wt::Dbo::ptr<AudioTrack>> tracks = session->find<AudioTrack>();
    for(Wt::Dbo::collection<Wt::Dbo::ptr<AudioTrack>>::const_iterator i = tracks.begin(); i != tracks.end(); ++i)
    {
        if(!std::filesystem::exists(std::filesystem::path((*i)->trackPath)))
        {
            Wt::Dbo::ptr<AudioTrack> item = session->find<AudioTrack>().where("fingerprint = ?").bind((*i)->trackFingerprint);
            Wt::log("info") << (*i)->trackPath + " not found in filesystem. Removed from DB.";
            item.remove();
        }
    }
    transaction.commit();
}

void GroovePlayerMgr::removeTrack(Wt::Dbo::Session* session, AudioTrack track)
{
    Wt::Dbo::Transaction transaction(*session);
    Wt::Dbo::ptr<AudioTrack> DBtrack = session->find<AudioTrack>().where("fingerprint = ?").bind(track.trackFingerprint);
    
    Wt::log("info") << (*DBtrack).trackPath + " being removed.";
    
    if(std::filesystem::exists(std::filesystem::path((*DBtrack).trackPath)))
    {
        remove((*DBtrack).trackPath.c_str());
    }
    DBtrack.remove();
    
    
    transaction.commit();
}

void GroovePlayerMgr::getPictureFromTrack(AudioTrack* trackToFill)
{
    if(trackToFill->trackPath != "")
    {
        TagLib::String file = TagLib::String(trackToFill->trackPath);
        if(file.substr(file.size()-3).upper() == "MP3" && TagLib::MPEG::File(trackToFill->trackPath.c_str()).hasID3v2Tag())
        {
            TagLib::MPEG::File file(trackToFill->trackPath.c_str());
            TagLib::ID3v2::Tag* tag = file.ID3v2Tag();
            if(!tag->frameListMap()["APIC"].isEmpty() && dynamic_cast<TagLib::ID3v2::AttachedPictureFrame*>(tag->frameListMap()["APIC"].front()) != nullptr)
            {
                TagLib::ID3v2::AttachedPictureFrame* pic = dynamic_cast<TagLib::ID3v2::AttachedPictureFrame*>(tag->frameListMap()["APIC"].front());
                trackToFill->coverArt = TagLib::ByteVector(pic->picture().data(),pic->picture().size());
                trackToFill->coverMimeType = std::string(pic->mimeType().toCString(true));
            }
        }
//         else if(dynamic_cast<TagLib::Ogg::XiphComment*>(tagTrack.tag()) != nullptr && !dynamic_cast<TagLib::Ogg::XiphComment*>(tagTrack.tag())->isEmpty())
//         {
//             TagLib::Ogg::XiphComment* tag = dynamic_cast<TagLib::Ogg::XiphComment*>(tagTrack.tag());
//             if(tag->fieldListMap()["METADATA_BLOCK_PICTURE"].isEmpty())
//             {
//                 tag->fieldListMap()["METADATA_BLOCK_PICTURE"];//TODO?
//             }
//         }
    }
}

bool GroovePlayerMgr::fileExistsInLibrary(std::string filename)
{
    for(std::filesystem::directory_entry p: std::filesystem::directory_iterator(musicScanDir))
    {
        if(p.path().filename() == filename)
        {
            return true;
        }
    }
    return false;
}


void GroovePlayerMgr::grooveAudioScannerLoop()
{
    Wt::Dbo::Session sqlSession;
    sqlSession.setConnectionPool(*connectionPool);
    sqlSession.mapClass<User>("user");
    sqlSession.mapClass<AudioTrack>("tracks");
    sqlSession.mapClass<UserAction>("actions");
    if(!std::filesystem::exists(musicScanDir))
    {
        std::filesystem::create_directory(musicScanDir);
        Wt::log("info") << "Directory "+std::filesystem::canonical(musicScanDir).string()+" didn't exist, so created.";
    } else 
    {
        Wt::log("info") << "Directory "+std::filesystem::canonical(musicScanDir).string()+" exists.";
    }
    for(std::filesystem::directory_entry p: std::filesystem::directory_iterator(musicScanDir))
    {
        ScanResults result = addFileToTrackDBIfTagged(&sqlSession, p.path());
        if(result == ScanResults::ACCEPTED)
        {
            Wt::log("info") << p.path().string() << " was added to DB";
        }
        else if(result != ScanResults::DUPLICATE_TRACK && result != ScanResults::WRONG_FILETYPE)
        {
            Wt::log("info") << p.path().string() + " was not accepted.";
        }
    }
    //Now check for tracks in DB without a file.
    removeOrphanedTracks(&sqlSession);
}