using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using PIC.Utils;
using Microsoft.Phone.Net.NetworkInformation;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
using System.Windows.Navigation;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace Paresh.Activities
{
    public partial class Activities : PhoneApplicationPage
    {
        WebClient client = new WebClient();
        RootPageItem[] items;
        ObservableCollection<RootPageItem> listRootPageItems;
        ObservableCollection<ObservableCollection<RootPageItem>> dataStack;

        public Activities()
        {
            InitializeComponent();
            listRootPageItems = new ObservableCollection<RootPageItem>();
          //  listSubPageItems = new List<SubPageItem>();
            dataStack = new ObservableCollection<ObservableCollection<RootPageItem>>();

            if (NetworkInterface.GetIsNetworkAvailable())
            {
                client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
                ProgBar.Visibility = Visibility.Visible;
                client.DownloadStringAsync("webUrl");
            }
            else
            {
                MessageBox.Show("No internet connection!!");
            }
        }

        void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error != null)
                return;

            else if (e.Error == null && !e.Cancelled)
            {
                ProgBar.Visibility = Visibility.Collapsed;

                String response = GlobalCls.getJsonData(e.Result);
                var ds = new DataContractJsonSerializer(typeof(RootPageItem[]));
                var msnew = new MemoryStream(Encoding.UTF8.GetBytes(response));
                items = (RootPageItem[])ds.ReadObject(msnew);

                RootPageItem item;
                listRootPageItems = new ObservableCollection<RootPageItem>();

                foreach (var ev in items)
                {
                    item = new RootPageItem();
                    item.Title = HttpUtility.HtmlDecode(ev.Title);
                    item.isParent = ev.isParent;

                    listRootPageItems.Add(item);
                }

                listBox1.ItemsSource = listRootPageItems;
            }
        }

        /**
         * Making a web call on clicking of an item
         *  - If response is with ListBox data, then filling data inside the same ListBox
         *  - else display detail data inside WebBrowser
         * */
        private void ListBoxClick(object sender, SelectionChangedEventArgs e)
        {
            if (listBox1.SelectedIndex != -1)
            {
                String title = items[listBox1.SelectedIndex].Title;
                int isParent = Convert.ToInt32(items[listBox1.SelectedIndex].isParent);

                dataStack.Add(listRootPageItems);
                PageTitle.Text = title;

                if (isParent > 0)
                {
                    webBrowser1.Visibility = Visibility.Collapsed;
                    listBox1.Visibility = Visibility.Visible;

                    listBox1.ItemsSource = null;

                    Uri webUrl = new Uri("WebURL");
                    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
                    ProgBar.Visibility = Visibility.Visible;
                    client.DownloadStringAsync(webUrl);
                }
                else
                {
                    webBrowser1.Visibility = Visibility.Visible;
                    listBox1.Visibility = Visibility.Collapsed;
                    String content= items[listBox1.SelectedIndex].content;
                    webBrowser1.NavigateToString(HttpUtility.HtmlDecode(content));
                }

                listBox1.SelectedIndex = -1;
            }
        }

         /**
         * While moving back, taking data from stack and displayed inside the same ListBox
         * */
        protected override void OnBackKeyPress(CancelEventArgs e)
        {
           listBox1.Visibility = Visibility.Visible;
           webBrowser1.Visibility = Visibility.Collapsed;
           listBox1.SelectedIndex = -1;

            if (dataStack.Count != 0)
            {
                listBox1.ItemsSource = null;
                listRootPageItems = dataStack[dataStack.Count-1];
                listBox1.ItemsSource = listRootPageItems;
                dataStack.Remove(listRootPageItems);

               e.Cancel = true;
            }
        }
    }
}