/// <summary>
/// Creates an IResultList for the paging object located in the response to a Spotify URI.
/// </summary>
/// <returns>The IResultList.</returns>
/// <param name="uri">The entire Spotify request URI (including the BASE_ADDRESS).</param>
/// <param name="isWrapped">
/// If set to <c>true</c>, the paging object is wrapped in a SearchResult, which actually contains multiple
/// paging objects. We deduce which one to use based on type parameter Q.
/// </param>
/// <typeparam name="T">The internal data type; an instance of IMetadata.</typeparam>
/// <typeparam name="Q">The json data type; an instance of IMetadataResult.</typeparam>
public IResultList <T> PagingUri <T, Q>(string uri, bool isWrapped) where T : IMetadata where Q : IMetadataResult
{
var task = Task.Run(async() =>
{
return(await GetJsonFullUri(uri));
});
var json = task.Result;
PagingObjectResult <Q> theList;
if (isWrapped)
{
var jsonResult = JsonConvert.DeserializeObject <SearchResult <Q> >(json);
theList = PagingObjectResult <Q> .CastTypeParam <Q>(jsonResult.Items);
}
else
{
theList = JsonConvert.DeserializeObject <PagingObjectResult <Q> >(json);
}
// Store metadata in the cache so we can use it, if possible
foreach (var item in theList.items)
{
metadata.CacheSubmit(item);
}
var search = new PagingWrapper <T, Q>(theList, this, isWrapped);
return(search);
}
internal PagingWrapper(PagingObjectResult <Q> result, WebApi webApi, bool isWrapped)
{
this.webApi = webApi;
this.isWrapped = isWrapped;
this.delayedLoad = null;
this.firstResult = result.offset;
this.nextPage = result.next;
this.prevPage = result.previous;
this.items = new List <T>();
var uids = new List <string>();
foreach (var item in result.items)
{
uids.Add(item.uri);
}
if (typeof(T) == typeof(ISong))
{
var songs = webApi.metadata.GetSongs(uids);
foreach (var song in songs)
{
this.items.Add((T)song);
}
}
else if (typeof(T) == typeof(IAlbum))
{
// TODO
throw new NotImplementedException();
}
else if (typeof(T) == typeof(IArtist))
{
// TODO
throw new NotImplementedException();
}
else if (typeof(T) == typeof(IPlaylist))
{
var playlists = webApi.metadata.GetPlaylists(uids);
foreach (var pl in playlists)
{
this.items.Add((T)pl);
}
}
else
{
throw new Exception("Invalid type T: " + typeof(T).Name);
}
}
internal SpotifyPlaylist(MetadataFactory factory, PlaylistResult result, WebApi webApi)
{
this.factory = factory;
this.uri = result.uri;
this.name = result.name;
PagingObjectResult <PlaylistTrackResult> tracks = result.tracks;
var wrap = new PagingWrapper <ISong, PlaylistTrackResult>(tracks, webApi, false);
this.page1 = wrap;
// Submit items for caching
foreach (var playlistTrack in tracks.items)
{
this.factory.CacheSubmit(playlistTrack);
}
}
public static PagingObjectResult <T> CastTypeParam <T>(PagingObjectResult <Q> original) where T : IMetadataResult
{
Debug.Assert(typeof(T) == typeof(Q));
var fresh = new PagingObjectResult <T>();
fresh.href = original.href;
fresh.limit = original.limit;
fresh.next = original.next;
fresh.offset = original.offset;
fresh.previous = original.previous;
fresh.total = original.total;
fresh.items = new List <T>();
foreach (var item in original.items)
{
// This casting is very kludgy but it works
fresh.items.Add((T)(IMetadataResult)item);
}
return(fresh);
}
