using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml;
using Windows.ApplicationModel.Background;
using Windows.Storage;
using Windows.UI.Notifications;
using YoutubeExplode.Models;

namespace FoxTube.Background
{
    public sealed class BackgroundProcessor : IBackgroundTask
    {
        private DateTime lastCheck;
        private readonly ApplicationDataContainer settings = ApplicationData.Current.RoamingSettings;
        dynamic prefs;
        BackgroundTaskDeferral def;

        public async void Run(IBackgroundTaskInstance taskInstance)
        {
            try
            {
                def = taskInstance.GetDeferral();

                if (settings.Values["lastCheck"] == null)
                {
                    settings.Values["lastCheck"] = DateTime.Now.ToString();
                    def.Complete();
                    return;
                }
                else
                    lastCheck = DateTime.Parse(settings.Values["lastCheck"] as string);

                prefs = JsonConvert.DeserializeObject<dynamic>(settings.Values["settings"] as string);
                if ((bool)prefs.devNotifications)
                    CheckAnnouncements();
                if ((bool)prefs.videoNotifications)
                    await CheckAccount();
            }
            finally
            {
                settings.Values["lastCheck"] = DateTime.Now.ToString();
                def.Complete();
            }
        }

        async Task CheckAccount()
        {
            try
            {
                Dictionary<string, string> subscriptions = JsonConvert.DeserializeObject<Dictionary<string, string>>(settings.Values["subscriptions"] as string);

                List<XmlElement> results = new List<XmlElement>();

                foreach (var s in subscriptions)
                {
                    XmlDocument doc = new XmlDocument();
                    doc.LoadXml(await new HttpClient().GetStringAsync($"https://www.youtube.com/feeds/videos.xml?channel_id={s.Key}"));

                    List<XmlElement> items = new List<XmlElement>();

                    foreach (XmlElement i in doc["feed"].ChildNodes)
                        if (i.Name == "entry" && DateTime.Parse(i["published"].InnerText) > lastCheck)
                            items.Add(i);

                    items.OrderByDescending(i => DateTime.Parse(i["published"].InnerText));

                    foreach(XmlElement i in items)
                    {
                        results.Add(i);

                        ToastNotificationManager.CreateToastNotifier().Show(
                            Notification.GetVideoToast(i["yt:videoId"].InnerText, s.Key, i["title"].InnerText, i["author"]["name"].InnerText, (await new YoutubeExplode.YoutubeClient().GetVideoAsync(i["yt:videoId"].InnerText)).Thumbnails.MediumResUrl, DateTime.Parse(i["published"].InnerText), s.Value));
                    }
                }

                TileUpdater updater = TileUpdateManager.CreateTileUpdaterForApplication();
                updater.EnableNotificationQueue(true);
                updater.Clear();
                for (int i = 0; i < 5 && i < results.Count; i++)
                    updater.Update(Tiles.GetTileLayout(System.Security.SecurityElement.Escape(results[i]["title"].InnerText), System.Security.SecurityElement.Escape(results[i]["author"]["name"].InnerText), (await new YoutubeExplode.YoutubeClient().GetVideoAsync(results[i]["yt:videoId"].InnerText)).Thumbnails.MediumResUrl.Replace("&", "%26"), subscriptions[results[i]["author"]["url"].InnerText.Split('/').Last()]));
            }
            catch { }
        }

        async void CheckAnnouncements()
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.LoadXml(await new HttpClient().GetStringAsync("http://foxgame-studio.000webhostapp.com/foxtube-messages.xml"));
                XmlElement item = doc["posts"].FirstChild as XmlElement;

                DateTime date = DateTime.Parse(item.GetAttribute("time"));
                if (date > lastCheck && date < DateTime.Now)
                    ToastNotificationManager.CreateToastNotifier().Show(
                        Notification.GetInternalToast(item["id"].InnerText,
                        item["header"][(string)prefs.language].InnerText,
                        item["content"][(string)prefs.language].InnerText,
                        item["thumbnail"].InnerText,
                        item["avatar"].InnerText));
            }
            catch { }
        }
    }
}