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using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Net;
using System.Windows;
using System.Windows.Media.Imaging;
using Juick.Classes;
using JuickApi;
using RestSharp;
using System.Diagnostics;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using System.Windows.Controls;
namespace Juick.ViewModels
{
public class ViewModelBase : INotifyPropertyChanged
{
static readonly string IsDataLoadingPropertyName = ExpressionHelper.GetPropertyName<ViewModelBase>(x => x.IsDataLoading);
bool isDataLoading;
public ViewModelBase()
{
Items = new ObservableCollection<PostItem>();
LoadMessagesPageCommand = new DelegateCommand(LoadData, () => !IsDataLoading);
NavigateNextCommand = new DelegateCommand(NavigateToThread, () => true);
}
public string RestUri { get; set; }
public virtual string Caption { get { return "juick"; } }
/// <summary>
/// A collection for MessageViewModel objects.
/// </summary>
public ObservableCollection<PostItem> Items { get; private set; }
public DelegateCommand LoadMessagesPageCommand { get; private set; }
public DelegateCommand NavigateNextCommand { get; private set; }
public bool IsDataLoading
{
get { return isDataLoading; }
set
{
isDataLoading = value;
NotifyPropertyChanged(IsDataLoadingPropertyName);
LoadMessagesPageCommand.NotifyCanExecuteChanged();
}
}
public void NavigateToThread(object param)
{
var selectionChangedEventArgs = param as SelectionChangedEventArgs;
if (param != null)
{
((App)App.Current).NavigateTo(new Uri(string.Format("/ThreadView.xaml?mid={0}", ((PostItem)selectionChangedEventArgs.AddedItems[0]).MID), UriKind.Relative));
}
}
/// <summary>
/// Creates and adds a few MessageViewModel objects into the Items collection.
/// </summary>
public void LoadData(object EventArgs)
{
const int offset = 5;
if (IsDataLoading)
{
return;
}
if (EventArgs != null)
{
var item = (EventArgs as LinkUnlinkEventArgs).ContentPresenter.Content;
if (!item.Equals(Items[Items.Count - offset])) {
return;
}
}
int count = Items.Count;
if (string.IsNullOrEmpty(RestUri))
{
RestUri = "/home?1=1";
}
// super-костыли
// todo: rewrite
else if (RestUri.StartsWith("/home?", StringComparison.InvariantCulture) && Items.Count > 0)
{
var lastItem = Items[Items.Count - 1];
RestUri = string.Format("/home?before_mid={0}", lastItem.MID);
}
else if (RestUri.StartsWith("/messages?", StringComparison.InvariantCulture) && Items.Count > 0)
{
var lastItem = Items[Items.Count - 1];
RestUri = string.Format("/messages?before_mid={0}", lastItem.MID);
}
var request = new RestRequest(RestUri + "&rnd=" + Environment.TickCount);
App.Client.Authenticator = new HttpBasicAuthenticator(App.Account.Credentials.UserName, App.Account.Credentials.Password);
App.Client.ExecuteAsync<List<Message>>(request, ProcessResponse);
IsDataLoading = true;
}
void ProcessResponse(IRestResponse<List<Message>> response)
{
IsDataLoading = false;
if (response.StatusCode != HttpStatusCode.OK)
{
MessageBox.Show(response.StatusCode.ToString());
return;
}
//Items.Clear();
response.Data.Select(x => new PostItem(x)).ToList().ForEach(i => Items.Add(i));
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
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