add movie, show, artist language buttons. search by english language name (#162)

ErsatzTV.Application/Artists/Mapper.cs

@@ -1,12 +1,16 @@
-using System.Linq;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
 using ErsatzTV.Core.Domain;
+using LanguageExt;
 using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Application.Artists
 {
     internal static class Mapper
     {
-        internal static ArtistViewModel ProjectToViewModel(Artist artist)
+        internal static ArtistViewModel ProjectToViewModel(Artist artist, List<string> languages)
         {
             ArtistMetadata metadata = Optional(artist.ArtistMetadata).Flatten().Head();
             return new ArtistViewModel(
@@ -17,11 +21,26 @@ namespace ErsatzTV.Application.Artists
                 Artwork(metadata, ArtworkKind.FanArt),
                 metadata.Genres.Map(g => g.Name).ToList(),
                 metadata.Styles.Map(s => s.Name).ToList(),
-                metadata.Moods.Map(m => m.Name).ToList());
+                metadata.Moods.Map(m => m.Name).ToList(),
+                LanguagesForArtist(languages));
         }
 
         private static string Artwork(Metadata metadata, ArtworkKind artworkKind) =>
             Optional(metadata.Artwork.FirstOrDefault(a => a.ArtworkKind == artworkKind))
                 .Match(a => a.Path, string.Empty);
+
+        private static List<CultureInfo> LanguagesForArtist(List<string> languages)
+        {
+            CultureInfo[] allCultures = CultureInfo.GetCultures(CultureTypes.NeutralCultures);
+
+            return languages
+                .Distinct()
+                .Map(
+                    lang => allCultures.Filter(
+                        ci => string.Equals(ci.ThreeLetterISOLanguageName, lang, StringComparison.OrdinalIgnoreCase)))
+                .Sequence()
+                .Flatten()
+                .ToList();
+        }
     }
 }