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;

namespace FoxTube.Models
{
	public class User
	{
		public Userinfoplus UserInfo { get; private set; }
		public UserCredential Credential { get; private set; }
		public Channel Channel { get; private set; }
		public List<Subscription> Subscriptions { get; } = new List<Subscription>();

		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
			{
				Credential = credential
			};

			BaseClientService.Initializer initializer = new BaseClientService.Initializer
			{
				ApplicationName = "FoxTube",
				HttpClientInitializer = credential
			};

			user.Service = new ExtendedYouTubeService(initializer);

			user.UserInfo = await new Oauth2Service(initializer).Userinfo.Get().ExecuteAsync();

			// TODO: Retrieve history and WL

			SubscriptionsResource.ListRequest subRequest = user.Service.Subscriptions.List("snippet");
			subRequest.Mine = true;
			subRequest.MaxResults = 50;
			subRequest.Order = SubscriptionsResource.ListRequest.OrderEnum.Relevance;
			SubscriptionListResponse subResponse;

			do
			{
				subResponse = await subRequest.ExecuteAsync();
				subRequest.PageToken = subResponse.NextPageToken;

				user.Subscriptions.AddRange(subResponse.Items);

			} while (!string.IsNullOrWhiteSpace(subRequest.PageToken));
			

			var request = user.Service.Channels.List("snippet,contentDetails,brandingSettings");
			request.Mine = true;
			user.Channel = request.Execute().Items[0];

			return user;
		}
	}
}