Juick/ViewModels/MainViewModel.cs


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using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.Serialization.Json;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using Juick.Api;
using RestSharp;

namespace Juick.ViewModels
{
    public class MainViewModel : INotifyPropertyChanged
    {
        public MainViewModel()
        {
            this.MyFeed = new ObservableCollection<MessageViewModel>();
            this.Last = new ObservableCollection<MessageViewModel>();
        }
        
        /// <summary>
        /// A collection for MessageViewModel objects.
        /// </summary>
        public ObservableCollection<MessageViewModel> MyFeed { get; private set; }

        /// <summary>
        /// A collection for MessageViewModel objects.
        /// </summary>
        public ObservableCollection<MessageViewModel> Last { get; private set; }

        public bool IsDataLoaded
        {
            get;
            private set;
        }

        /// <summary>
        /// Creates and adds a few MessageViewModel objects into the MyFeed collection.
        /// </summary>
        public void LoadData()
        {
            var request = new RestRequest("/home?1=1" + "&rnd=" + Environment.TickCount);
            App.Client.Authenticator = new HttpBasicAuthenticator(App.Account.Credentials.UserName, App.Account.Credentials.Password);
            App.Client.ExecuteAsync(request, response =>
                                                 {
                                                     if (response.StatusCode != HttpStatusCode.OK)
                                                     {
                                                         MessageBox.Show(response.StatusCode.ToString());
                                                         return;
                                                     }
                                                     var ser = new DataContractJsonSerializer(typeof (List<Message>));
                                                     
                                                         var messages =
                                                             ser.ReadObject(new MemoryStream(response.RawBytes)) as List<Message>;
                                                         MyFeed.Clear();
                                                     messages.ForEach(post =>
                                                                          {
                                                                              var item = new MessageViewModel(post)
                                                                                             {
                                                                                                 Status =
                                                                                                     string.Format(
                                                                                                         "Posted on: {0}, replies: {1}",
                                                                                                         post.
                                                                                                             timestamp,
                                                                                                         post.
                                                                                                             replies)
                                                                                             };
                                                                              MyFeed.Add(item);
                                                                              var imageRequest =
                                                                                  new RestRequest(
                                                                                      string.Format("/as/{0}.png",
                                                                                                    post.user.uid));
                                                                              App.AvatarClient.ExecuteAsync(
                                                                                  imageRequest, restResponse =>
                                                                                                    {
                                                                                                        item.UserAvatar = new BitmapImage
                                                                                                                ();
                                                                                                        item.UserAvatar.SetSource(new MemoryStream(restResponse.RawBytes));
                                                                                                        item.
                                                                                                            NotifyPropertyChanged
                                                                                                            ("UserAvatar");
                                                                                                    });
                                                                          });
                                                         NotifyPropertyChanged("MyFeed");
                                                     
                                                 });
            var lastrequest = new RestRequest("/messages?1=1" + "&rnd=" + Environment.TickCount);
            App.Client.ExecuteAsync(lastrequest, response =>
            {
                var ser = new DataContractJsonSerializer(typeof(List<Message>));
                using (var ms = new MemoryStream(response.RawBytes))
                {
                    var messages =
                        (List<Message>)ser.ReadObject(ms);
                    if (messages == null) return;
                    Last.Clear();
                    messages.ForEach(post => 
                    {
                        var item = new MessageViewModel(post)
                        {
                            Status =
                                string.Format(
                                    "Posted on: {0}, replies: {1}",
                                    post.
                                        timestamp,
                                    post.
                                        replies)
                        };
                        Last.Add(item);
                        var imageRequest =
                            new RestRequest(
                                string.Format("/as/{0}.png",
                                              post.user.uid));
                        App.AvatarClient.ExecuteAsync(
                            imageRequest, restResponse =>
                            {
                                item.UserAvatar = new BitmapImage
                                        ();
                                item.UserAvatar.SetSource(new MemoryStream(restResponse.RawBytes));
                                item.
                                    NotifyPropertyChanged
                                    ("UserAvatar");
                            });  
                    });
                    NotifyPropertyChanged("Last");
                }
            });
        }

       
        public event PropertyChangedEventHandler PropertyChanged;
        public void NotifyPropertyChanged(String propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (null != handler)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}