New pages, LoginViewModel, Validation (in progress)

3 files changed, 117 insertions, 3 deletions

diff --git a/Juick/ViewModels/LoginViewModel.cs b/Juick/ViewModels/LoginViewModel.cs
new file mode 100644
index 0000000..95528fe
--- /dev/null
+++ b/Juick/ViewModels/LoginViewModel.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Net;
+using System.Windows;
+using Juick.Classes;
+using Juick.ViewModels.Validation;
+using RestSharp;
+
+namespace Juick.ViewModels
+{
+    public class LoginViewModel : DataViewModelBase 
+    {
+        private string _username;
+        private string _password;
+        private DelegateCommand<RoutedEventArgs> _signInCommand;
+
+        public string Username
+        {
+            get
+            {
+                return _username ?? (_username = App.AppContext.Account.UserName);
+            }
+            set
+            {
+                _username = value;
+                NotifyPropertyChanged("Username");
+            }
+        }
+
+        public string Password
+        {
+            get
+            {
+                return _password ?? (_password = App.AppContext.Account.Password);
+            }
+            set
+            {
+                _password = value;
+                NotifyPropertyChanged("Password");
+            }
+        }
+
+        public Uri NextUri { get; set; }
+
+        public DelegateCommand<RoutedEventArgs> SignInCommand
+        {
+            get
+            {
+                return _signInCommand ?? (_signInCommand = new DelegateCommand<RoutedEventArgs>(CheckAuth, () => true));
+            }
+        }
+
+        public void CheckAuth(RoutedEventArgs e)
+        {
+            App.AppContext.Client.Authenticator = new HttpBasicAuthenticator(Username, Password);
+            App.AppContext.Client.ExecuteAsync(new RestRequest("/post", Method.POST), response =>
+                                                                             {
+                                                                                 if (response.StatusCode ==
+                                                                                     HttpStatusCode.BadRequest)
+                                                                                 {
+                                                                                     App.AppContext.Account.UserName = Username;
+                                                                                     App.AppContext.Account.Password = Password;
+                                                                                     App.AppContext.Account.IsAuthenticated = true;
+                                                                                     ((App)Application.Current).NavigateTo(NextUri, true);
+                                                                                 }
+                                                                                 else
+                                                                                 {
+                                                                                     AddError("Username", "Invalid username or password", false);
+                                                                                 }
+                                                                             });
+        }
+    }
+}
diff --git a/Juick/ViewModels/PageViewModel.cs b/Juick/ViewModels/PageViewModel.cs
index 02f86ff..e398caf 100644
--- a/Juick/ViewModels/PageViewModel.cs
+++ b/Juick/ViewModels/PageViewModel.cs
@@ -31,11 +31,10 @@ namespace Juick.ViewModels
             set
             {
                 _restUri = value;
-                RefreshData();
             }
         }
 
-        public virtual string Caption { get { return "juick"; } }
+        public virtual string Caption { get; set; }
 
         public ObservableCollection<PostItem> Items { get; private set; }
 
@@ -70,7 +69,6 @@ namespace Juick.ViewModels
             }
 
             var request = new RestRequest(requestUri);
-            _context.Client.Authenticator = new HttpBasicAuthenticator(_context.Account.Credentials.UserName, _context.Account.Credentials.Password);
             _context.Client.ExecuteAsync<List<Message>>(request, response =>
             {
                 _context.IsDataLoading = false;
diff --git a/Juick/ViewModels/Validation/DataViewModelBase.cs b/Juick/ViewModels/Validation/DataViewModelBase.cs
new file mode 100644
index 0000000..dcbf34b
--- /dev/null
+++ b/Juick/ViewModels/Validation/DataViewModelBase.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+namespace Juick.ViewModels.Validation
+{
+    public class DataViewModelBase : ViewModelBase, IDataErrorInfo
+    {
+
+        private readonly Dictionary<String, List<String>> _errors =
+           new Dictionary<string, List<string>>();
+
+        // Adds the specified error to the errors collection if it is not already 
+        // present, inserting it in the first position if isWarning is false. 
+        public void AddError(string propertyName, string error, bool isWarning)
+        {
+            if (!_errors.ContainsKey(propertyName))
+                _errors[propertyName] = new List<string>();
+
+            if (_errors[propertyName].Contains(error)) return;
+            if (isWarning) _errors[propertyName].Add(error);
+            else _errors[propertyName].Insert(0, error);
+        }
+
+        // Removes the specified error from the errors collection if it is present. 
+        public void RemoveError(string propertyName, string error)
+        {
+            if (!_errors.ContainsKey(propertyName) || !_errors[propertyName].Contains(error)) return;
+            _errors[propertyName].Remove(error);
+            if (_errors[propertyName].Count == 0) _errors.Remove(propertyName);
+        }
+
+        public string Error { get { throw new NotImplementedException(); } }
+
+        public string this[string columnName]
+        {
+            get
+            {
+                return (!_errors.ContainsKey(columnName) ? null :
+                    String.Join(Environment.NewLine, _errors[columnName]));
+            }
+        }
+    }
+}