using System;
using System.Collections.Generic;
using System.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Google.Apis.YouTube.v3;
using Google.Apis.YouTube.v3.Data;
using Windows.Storage;
using FoxTube.Controls;
using FoxTube.Pages;
using System.Globalization;

namespace FoxTube
{
    /// <summary>
    /// Home page
    /// </summary>
    public sealed partial class Home : Page
    {
        private bool trendLoaded = false;

        VideoGrid trendGrid;
        ShowMore trendMore;
        LoadingPage loading;

        string trendToken;
        Dictionary<string, string> subsTokens = new Dictionary<string, string>();
        string reg;

        public Home()
        {
            InitializeComponent();
            reg = CultureInfo.GetCultures(CultureTypes.AllCultures).Find(i => i.IetfLanguageTag == SettingsStorage.Region).IetfLanguageTag.Remove(0, 3);
            
            trendGrid = ((trending.Content as ScrollViewer).Content as StackPanel).Children[0] as VideoGrid;
            trendMore = ((trending.Content as ScrollViewer).Content as StackPanel).Children[1] as ShowMore;

            loading = grid.Children[2] as LoadingPage;

            Initialize();
        }

        private void refreshPage(object sender, RoutedEventArgs e)
        {
            Methods.MainPage.GoToHome();
        }

        private async void TrendMore_Clicked()
        {
            try
            {
                VideosResource.ListRequest request = SecretsVault.Service.Videos.List("id");
                request.MaxResults = 48;
                request.PageToken = trendToken;

                request.Chart = VideosResource.ListRequest.ChartEnum.MostPopular;
                request.RegionCode = reg;
                VideoListResponse response = await request.ExecuteAsync();

                if (!string.IsNullOrWhiteSpace(response.NextPageToken))
                    trendToken = response.NextPageToken;
                else
                    trendMore.Complete(true);

                foreach (Video vid in response.Items)
                {
                    VideoCard vCard = new VideoCard(vid.Id);
                    trendGrid.Add(vCard);
                }
                trendMore.Complete();
            }
            catch
            {
                trendMore.Complete(true);
            }
        }

        public void Initialize()
        {
            if(SecretsVault.IsAuthorized)
                LoadRecommendations();
            else
            {
                pivot.Items.Remove(recommended);
                pivot.Items.Remove(subscriptions);

                LoadTrending();
            }
        }

        private void pivot_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            loading.Close();
            if (pivot.SelectedItem == recommended)
                LoadRecommendations();
            else if (pivot.SelectedItem == trending && !trendLoaded)
                LoadTrending();
            else if (pivot.SelectedItem == subscriptions)
                LoadSubscriptions();
        }

        async void LoadTrending()
        {
            try
            {
                loading.Refresh();
                VideosResource.ListRequest request = SecretsVault.Service.Videos.List("id");
                request.MaxResults = 48;

                request.Chart = VideosResource.ListRequest.ChartEnum.MostPopular;
                request.RegionCode = reg;
                VideoListResponse response = await request.ExecuteAsync();

                if (!string.IsNullOrWhiteSpace(response.NextPageToken))
                    trendToken = response.NextPageToken;
                else
                    trendMore.Complete(true);

                foreach (Video vid in response.Items)
                {
                    VideoCard vCard = new VideoCard(vid.Id);
                    trendGrid.Add(vCard);
                }

                loading.Close();
                trendLoaded = true;
            }
            catch (System.Net.Http.HttpRequestException)
            {
                trendLoaded = false;
                loading.Error("System.Net.Http.HttpRequestException", "Unable to connect to Google servers.", true);
            }
            catch(Exception e)
            {
                trendLoaded = false;
                loading.Error(e.GetType().ToString(), e.Message);
            }
        }

        void LoadRecommendations()
        {
            try
            {
                loading.Refresh();
                throw new NotImplementedException("This page has not implemented yet.");
            }
            catch (System.Net.Http.HttpRequestException)
            {
                loading.Error("System.Net.Http.HttpRequestException", "Unable to connect to Google servers.", true);
            }
            catch (Exception e)
            {
                loading.Error(e.GetType().ToString(), e.Message);
            }
        }

        void LoadSubscriptions()
        {
            try
            {
                loading.Refresh();
                throw new NotImplementedException("This page has not implemented yet.");
            }
            catch (System.Net.Http.HttpRequestException)
            {
                loading.Error("System.Net.Http.HttpRequestException", "Unable to connect to Google servers.", true);
            }
            catch (Exception e)
            {
                loading.Error(e.GetType().ToString(), e.Message);
            }
        }
    }
}