public async Task <IActionResult> RecommendArtist(CharacteristicsQuery query)
{
ArtistResultModel artist = await _artistRecommendationService.GetRecommendedArtistAsync(query);
if (artist.Probability == 0)
{
return(NoContent());
}
return(Ok(artist));
}
public async Task <ArtistResultModel> GetRecommendedArtistAsync(CharacteristicsQuery query)
{
IEnumerable <Artist> artists = await _unitOfWork.Artists.GetAllArtistWithRelatedEntitiesAsync();
IEnumerable <ArtistWithProbability> artistsWithProbabilities =
artists.Select(a => _mapper.Map <ArtistWithProbability>(a)).ToArray();
foreach (ArtistWithProbability artist in artistsWithProbabilities)
{
CalculateProbability(artist, query);
_logger.LogInformation($"Current Value of probability for {artist.Name} is: {artist.GetProbabilityValue()}");
}
decimal highestProbability = artistsWithProbabilities.Select(
a => a.GetProbabilityValue()).Max();
_logger.LogInformation($"Current Highest Probability is : {highestProbability}");
var mostLikelyArtist = artistsWithProbabilities.FirstOrDefault(
a => a.GetProbabilityValue() == highestProbability);
_logger.LogInformation($"Most Likely Artist : {mostLikelyArtist.Name}");
return(_mapper.Map <ArtistResultModel>(mostLikelyArtist));
}
private void CalculateProbability(ArtistWithProbability artist, CharacteristicsQuery query)
{
if (query.Genres != null)
{
foreach (GenreModel genre in query.Genres)
{
ArtistGenre artistGenre = artist.ArtistGenres.FirstOrDefault(ag => ag.GenreId == genre.Id);
if (artistGenre == null)
{
artist.CalculateProbability(0);
return;
}
artist.CalculateProbability(artistGenre.Probability);
}
}
if (query.Instruments != null)
{
foreach (InstrumentModel instrument in query.Instruments)
{
ArtistInstrument artistInstrument = artist.ArtistInstruments.FirstOrDefault(ai => ai.InstrumentId == instrument.Id);
if (artistInstrument == null)
{
artist.CalculateProbability(0);
return;
}
artist.CalculateProbability(artistInstrument.Probability);
}
}
if (query.Tempos != null)
{
foreach (TempoModel tempo in query.Tempos)
{
ArtistTempo artistTempo = artist.ArtistTempos.FirstOrDefault(at => at.TempoId == tempo.Id);
if (artistTempo == null)
{
artist.CalculateProbability(0);
return;
}
artist.CalculateProbability(artistTempo.Probability);
}
}
if (query.Novelties != null)
{
foreach (NoveltyModel novelty in query.Novelties)
{
ArtistNovelty artistNovelty = artist.ArtistNovelties.FirstOrDefault(an => an.NoveltyId == novelty.Id);
if (artistNovelty == null)
{
artist.CalculateProbability(0);
return;
}
artist.CalculateProbability(artistNovelty.Probability);
}
}
}
