/// <summary>
/// Process returns an AlbumArtistsResponse containing a list of artists, albums, and songs
/// </summary>
public void Process(UriWrapper uri, IHttpProcessor processor, User user)
{
// Lists of artists, albums, songs to be returned via handler
IList <AlbumArtist> albumArtists = new List <AlbumArtist>();
IList <Album> albums = new List <Album>();
IList <Song> songs = new List <Song>();
Dictionary <string, int> counts = new Dictionary <string, int>();
PairList <string, int> sectionPositions = new PairList <string, int>();
// Optional Last.fm info
string lastfmInfo = null;
// Check if an ID was passed
if (uri.Id != null)
{
// Add artist by ID to the list
AlbumArtist a = Injection.Kernel.Get <IAlbumArtistRepository>().AlbumArtistForId((int)uri.Id);
albumArtists.Add(a);
// Add artist's albums to response
albums = a.ListOfAlbums();
counts.Add("albums", albums.Count);
// If requested, add artist's songs to response
if (uri.Parameters.ContainsKey("includeSongs") && uri.Parameters["includeSongs"].IsTrue())
{
songs = a.ListOfSongs();
counts.Add("songs", songs.Count);
}
else
{
counts.Add("songs", a.ListOfSongs().Count);
}
// If requested, add artist's Last.fm info to response
if (uri.Parameters.ContainsKey("lastfmInfo") && uri.Parameters["lastfmInfo"].IsTrue())
{
logger.IfInfo("Querying Last.fm for artist: " + a.AlbumArtistName);
try
{
lastfmInfo = Lastfm.GetAlbumArtistInfo(a);
logger.IfInfo("Last.fm query complete!");
}
catch (Exception e)
{
logger.Error("Last.fm query failed!");
logger.Error(e);
}
}
// Get favorites count if available
if (a.AlbumArtistId != null)
{
int favoriteCount = Injection.Kernel.Get <IFavoriteRepository>().FavoritesForAlbumArtistId(a.AlbumArtistId, user.UserId).Count;
counts.Add("favorites", favoriteCount);
}
else
{
counts.Add("favorites", 0);
}
}
// Check for a request for range of artists
else if (uri.Parameters.ContainsKey("range"))
{
string[] range = uri.Parameters["range"].Split(',');
// Ensure valid range was parsed
if (range.Length != 2)
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'range' requires a valid, comma-separated character tuple", null, null, null, null, null, null));
return;
}
// Validate as characters
char start, end;
if (!Char.TryParse(range[0], out start) || !Char.TryParse(range[1], out end))
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'range' requires characters which are single alphanumeric values", null, null, null, null, null, null));
return;
}
// Grab range of artists
albumArtists = Injection.Kernel.Get <IAlbumArtistRepository>().RangeAlbumArtists(start, end);
}
// Check for a request to limit/paginate artists, like SQL
// Note: can be combined with range or all artists
if (uri.Parameters.ContainsKey("limit") && uri.Id == null)
{
string[] limit = uri.Parameters["limit"].Split(',');
// Ensure valid limit was parsed
if (limit.Length < 1 || limit.Length > 2)
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'limit' requires a single integer, or a valid, comma-separated integer tuple", null, null, null, null, null, null));
return;
}
// Validate as integers
int index = 0;
int duration = Int32.MinValue;
if (!Int32.TryParse(limit[0], out index))
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'limit' requires a valid integer start index", null, null, null, null, null, null));
return;
}
// Ensure positive index
if (index < 0)
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'limit' requires a non-negative integer start index", null, null, null, null, null, null));
return;
}
// Check for duration
if (limit.Length == 2)
{
if (!Int32.TryParse(limit[1], out duration))
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'limit' requires a valid integer duration", null, null, null, null, null, null));
return;
}
// Ensure positive duration
if (duration < 0)
{
processor.WriteJson(new AlbumArtistsResponse("Parameter 'limit' requires a non-negative integer duration", null, null, null, null, null, null));
return;
}
}
// Check if results list already populated by range
if (albumArtists.Count > 0)
{
// No duration? Return just specified number of artists
if (duration == Int32.MinValue)
{
albumArtists = albumArtists.Skip(0).Take(index).ToList();
}
else
{
// Else, return artists starting at index, up to count duration
albumArtists = albumArtists.Skip(index).Take(duration).ToList();
}
}
else
{
// If no artists in list, grab directly using model method
albumArtists = Injection.Kernel.Get <IAlbumArtistRepository>().LimitAlbumArtists(index, duration);
}
}
// Finally, if no artists already in list, send the whole list
if (albumArtists.Count == 0)
{
albumArtists = Injection.Kernel.Get <IAlbumArtistRepository>().AllAlbumArtists();
sectionPositions = Utility.SectionPositionsFromSortedList(new List <IGroupingItem>(albumArtists.Select(c => (IGroupingItem)c)));
}
// Send it!
processor.WriteJson(new AlbumArtistsResponse(null, albumArtists, albums, songs, counts, lastfmInfo, sectionPositions));
return;
}
