Added album.getTopTags API method to get top tags

src/IF.Lastfm.Core/Api/AlbumApi.cs

@@ -46,9 +46,15 @@ public Task<PageResponse<LastTag>> GetUserTagsForAlbumAsync(string artist, strin
             throw new NotImplementedException();
         }
 
-        public Task<PageResponse<LastTag>> GetTopTagsForAlbumAsync(string artist, string album, bool autocorrect = false)
+        public async Task<PageResponse<LastTag>> GetTopTagsForAlbumAsync(string artist, string album, bool autocorrect = false)
         {
-            throw new NotImplementedException();
+            var command = new AlbumTopTagsCommand(Auth)
+            {
+                ArtistName = artist,
+                AlbumName = album
+            };
+
+            return await command.ExecuteAsync();
         }
 
         public async Task<PageResponse<LastAlbum>> SearchForAlbumAsync(string albumname, int page = 1, int itemsPerPage = LastFm.DefaultPageLength)

src/IF.Lastfm.Core/Api/Commands/AlbumApi/AlbumTopTagsCommand.cs

@@ -0,0 +1,75 @@
+using IF.Lastfm.Core.Api.Enums;
+using IF.Lastfm.Core.Api.Helpers;
+using IF.Lastfm.Core.Objects;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IF.Lastfm.Core.Api.Commands.AlbumApi
+{
+    internal class AlbumTopTagsCommand : GetAsyncCommandBase<PageResponse<LastTag>>
+    {
+        public string AlbumMbid { get; set; }
+
+        public string ArtistName { get; set; }
+
+        public string AlbumName { get; set; }
+
+        public bool Autocorrect { get; set; }
+
+        public AlbumTopTagsCommand(ILastAuth auth)
+            : base(auth)
+        {
+            Method = "album.gettoptags";
+        }
+
+        public AlbumTopTagsCommand(ILastAuth auth, string album, string artist)
+            : this(auth)
+        {
+            AlbumName = album;
+            ArtistName = artist;
+        }
+
+        public override void SetParameters()
+        {
+            if (AlbumMbid != null)
+            {
+                Parameters.Add("mbid", AlbumMbid);
+            }
+            else
+            {
+                Parameters.Add("artist", ArtistName);
+                Parameters.Add("album", AlbumName);
+            }
+
+            Parameters.Add("autocorrect", Convert.ToInt32(Autocorrect).ToString());
+
+            AddPagingParameters();
+            DisableCaching();
+        }
+
+        public async override Task<PageResponse<LastTag>> HandleResponse(HttpResponseMessage response)
+        {
+            var json = await response.Content.ReadAsStringAsync();
+
+            LastFmApiError error;
+            if (LastFm.IsResponseValid(json, out error) && response.IsSuccessStatusCode)
+            {
+                var jtoken = JsonConvert.DeserializeObject<JToken>(json);
+                var resultsToken = jtoken.SelectToken("toptags");
+                var itemsToken = resultsToken.SelectToken("tag");
+
+                return PageResponse<LastTag>.CreateSuccessResponse(itemsToken, resultsToken, LastTag.ParseJToken, false);
+            }
+            else
+            {
+                return LastResponse.CreateErrorResponse<PageResponse<LastTag>>(error);
+            }
+        }
+    }
+}

src/IF.Lastfm.Core/IF.Lastfm.Core.csproj

@@ -40,6 +40,7 @@
   <ItemGroup>
     <Compile Include="Api\AlbumApi.cs" />
     <Compile Include="Api\ArtistApi.cs" />
+    <Compile Include="Api\Commands\AlbumApi\AlbumTopTagsCommand.cs" />
     <Compile Include="Api\Commands\UserApi\GetRecommendedArtistsCommand.cs" />
     <Compile Include="Api\LastAuth.cs" />
     <Compile Include="Api\ChartApi.cs" />