IF.Lastfm/IF.Lastfm.Core/Api/Commands/ArtistApi/GetArtistShoutsCommand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using IF.Lastfm.Core.Api.Enums;
using IF.Lastfm.Core.Api.Helpers;
using IF.Lastfm.Core.Objects;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace IF.Lastfm.Core.Api.Commands.ArtistApi
{
    internal class GetArtistShoutsCommand : GetAsyncCommandBase<PageResponse<Shout>>
    {
        public string ArtistName { get; set; }
        public bool Autocorrect { get; set; }

        public GetArtistShoutsCommand(IAuth auth, string artistname)
            : base(auth)
        {
            Method = "artist.getShouts";
            ArtistName = artistname;
        }

        public override Uri BuildRequestUrl()
        {
            var parameters = new Dictionary<string, string>
                             {
                                 {"artist", Uri.EscapeDataString(ArtistName)},
                                 {"autocorrect", Convert.ToInt32(Autocorrect).ToString()}
                             };

            base.AddPagingParameters(parameters);
            base.DisableCaching(parameters);

            var apiUrl = LastFm.FormatApiUrl(Method, Auth.ApiKey, parameters);
            return new Uri(apiUrl, UriKind.Absolute);
        }

        public async override Task<PageResponse<Shout>> HandleResponse(HttpResponseMessage response)
        {
            string json = await response.Content.ReadAsStringAsync();

            LastFmApiError error;
            if (LastFm.IsResponseValid(json, out error) && response.IsSuccessStatusCode)
            {
                JToken jtoken = JsonConvert.DeserializeObject<JToken>(json).SelectToken("shouts");
                var shoutsToken = jtoken.SelectToken("shout");

                var pageresponse = PageResponse<Shout>.CreateSuccessResponse();
                pageresponse.AddPageInfoFromJToken(jtoken.SelectToken("@attr"));

                var shouts = new List<Shout>();
                if (shoutsToken != null && pageresponse.TotalItems > 0)
                {
                    if (pageresponse.Page == pageresponse.TotalPages
                        && pageresponse.TotalItems % pageresponse.PageSize == 1)
                    {
                        // array notation isn't used on the api if there is only one shout.
                        shouts.Add(Shout.ParseJToken(shoutsToken));
                    }
                    else
                    {
                        shouts.AddRange(shoutsToken.Children().Select(Shout.ParseJToken));
                    }
                }

                pageresponse.Content = shouts;

                return pageresponse;
            }
            else
            {
                return PageResponse<Shout>.CreateErrorResponse(error);
            }
        }
        

    }
}