Added subscriptions management

FoxTube.Core/Models/User.cs

@@ -1,11 +1,16 @@
-using Google.Apis.Auth.OAuth2;
+using FoxTube.Utils;
+using Google.Apis.Auth.OAuth2;
 using Google.Apis.Oauth2.v2;
 using Google.Apis.Oauth2.v2.Data;
 using Google.Apis.Services;
 using Google.Apis.YouTube.v3;
 using Google.Apis.YouTube.v3.Data;
+using Newtonsoft.Json;
+using System;
+using System.Linq;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Windows.Storage;
 using YouTube;
 using YoutubeExplode;
 
@@ -21,11 +26,69 @@ namespace FoxTube.Models
 		public ExtendedYouTubeService Service { get; private set; }
 		public YoutubeClient Client { get; private set; }
 
+		private User() { }
+
+		public async Task<bool> UpdateSubscriptionState(string channelId)
+		{
+			if (Subscriptions.Exists(x => x.Snippet.ResourceId.ChannelId == channelId))
+			{
+				Subscription s = Subscriptions.Find(x => x.Snippet.ResourceId.ChannelId == channelId);
+
+				try { await Service.Subscriptions.Delete(s.Id).ExecuteAsync(); }
+				catch (Exception e)
+				{
+					Metrics.SendReport(new Exception("Failed to unsubscribe", e));
+					return true; 
+				}
+
+				UserManagement.SubscriptionsChangedInvoker(this, s);
+				Subscriptions.Remove(s);
+
+				SaveSubscriptions();
+				return false;
+			}
+			else
+			{
+				var request = Service.Subscriptions.Insert(new Subscription()
+				{
+					Snippet = new SubscriptionSnippet()
+					{
+						ResourceId = new ResourceId()
+						{
+							ChannelId = channelId,
+							Kind = "youtube#channel"
+						}
+					}
+				}, "snippet");
+
+				Subscription s = await request.ExecuteAsync();
+				if (s == null)
+					return false;
+				Subscriptions.Add(s);
+
+				UserManagement.SubscriptionsChangedInvoker(this, s);
+
+				SaveSubscriptions();
+				return true;
+			}
+		}
+
+		private void SaveSubscriptions()
+		{
+			Dictionary<string, string> subs = Subscriptions.Select(i => 
+				new KeyValuePair<string, string>(i.Snippet.ResourceId.ChannelId, i.Snippet.Thumbnails.Default__?.Url))
+				as Dictionary<string, string>;
+
+			ApplicationData.Current.RoamingSettings.Values[$"Subscriptions.{UserInfo.Id}"] = JsonConvert.SerializeObject(subs);
+		}
+
 		public static async Task<User> GetUser(UserCredential credential)
 		{
-			User user = new User();
+			User user = new User
+			{
+				Credential = credential
+			};
 
-			user.Credential = credential;
 			BaseClientService.Initializer initializer = new BaseClientService.Initializer
 			{
 				ApplicationName = "FoxTube",
@@ -52,6 +115,7 @@ namespace FoxTube.Models
 				user.Subscriptions.AddRange(subResponse.Items);
 
 			} while (!string.IsNullOrWhiteSpace(subRequest.PageToken));
+			
 
 			var request = user.Service.Channels.List("snippet,contentDetails,brandingSettings");
 			request.Mine = true;