From 1195250b98172d34b8c49b85a81c21d1f26cdbac Mon Sep 17 00:00:00 2001
From: Nexusls <luis.sander@edu.bib.de>
Date: Thu, 13 Mar 2025 14:07:13 +0100
Subject: [PATCH] =?UTF-8?q?MOD:=20MainWindow=20with=20simple=20log=20in=20?=
 =?UTF-8?q?logic=20+=20connection=20to=20PostgreSQL=20(Database)=20ADD:=20?=
 =?UTF-8?q?SearchWindow=20with=20logic=20from=20Suchenfenster=20+=20"Zur?=
 =?UTF-8?q?=C3=BCck"-Button=20to=20change=20back=20to=20MainWindow=20DEL:?=
 =?UTF-8?q?=20SuchenFenster=20(exhcanged=20with=20Search=20Window)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 PrototypWPFHAG/MainWindow.xaml                |  33 ++--
 PrototypWPFHAG/MainWindow.xaml.cs             | 144 ++++++++++--------
 PrototypWPFHAG/PrototypWPFHAG.csproj          |   2 +-
 .../{SuchenFenster.xaml => SearchWindow.xaml} |  32 ++--
 PrototypWPFHAG/SearchWindow.xaml.cs           |  34 +++++
 PrototypWPFHAG/SuchenFenster.xaml.cs          |   1 -
 6 files changed, 155 insertions(+), 91 deletions(-)
 rename PrototypWPFHAG/{SuchenFenster.xaml => SearchWindow.xaml} (74%)
 create mode 100644 PrototypWPFHAG/SearchWindow.xaml.cs
 delete mode 100644 PrototypWPFHAG/SuchenFenster.xaml.cs

diff --git a/PrototypWPFHAG/MainWindow.xaml b/PrototypWPFHAG/MainWindow.xaml
index 8e57ed9..368e9a2 100644
--- a/PrototypWPFHAG/MainWindow.xaml
+++ b/PrototypWPFHAG/MainWindow.xaml
@@ -12,21 +12,36 @@
                  TitleCharacterCasing="Normal"
                  WindowTitleBrush="Firebrick"
                  Icon="pack://application:,,,/Images/databaseicon.png"
-                 ResizeMode="CanResizeWithGrip">
+                 ResizeMode="CanResizeWithGrip"
+                 Loaded="Window_Loaded">
     <Grid>
         <Border BorderBrush="Firebrick" BorderThickness="3" Padding="20">
             <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
-                <!-- 用户名标签和输入框 -->
-                <TextBlock Text="USERNAME" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
+
+                <!-- Username -->
+                <TextBlock Text="Benutzername" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
                 <TextBox Width="200" Height="30" Margin="0,5,0,0" x:Name="UsernameTextBox" />
 
-                <!-- 密码标签和输入框 -->
-                <TextBlock Text="PASSWORD" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
-                <PasswordBox Width="200" Height="30" Margin="0,5,0,0" x:Name="PasswordTextBox" />
+                <TextBlock Text="Passwort" Margin="0,10,0,0" FontSize="14" FontWeight="Bold" />
+                <Grid>
+                    <!-- Passwortbox (hidden when Password is visible) -->
+                    <PasswordBox Width="170" Height="30" Margin="0,5,34,0" x:Name="PasswordTextBox"
+                    PasswordChanged="PasswordTextBox_PasswordChanged"/>
 
-                <!-- 登录按钮 -->
-                <Button Height="30" Width="100" Content="Log in" Margin="0,20,0,0" Click="loginButton_Click" />
+                    <!-- Textbox for visible password (hidden at default) -->
+                    <TextBox Width="170" Height="30" Margin="0,5,34,0" x:Name="PasswordVisibleTextBox"
+                    Visibility="Collapsed" IsReadOnly="True"/>
+
+                    <!-- Button with Eye-Icon -->
+                    <Button Width="30" Height="30" Margin="175,5,0,0" Content="👁" 
+                    Click="ShowPasswordButton_Click"/>
+                </Grid>
+
+
+                <!-- Login Button -->
+                <Button Height="30" Width="100" Content="Zur Suche" Margin="0,20,0,0" 
+                        Click="loginButton_Click" IsDefault="True" />
             </StackPanel>
         </Border>
     </Grid>
-</mah:MetroWindow>
\ No newline at end of file
+</mah:MetroWindow>
diff --git a/PrototypWPFHAG/MainWindow.xaml.cs b/PrototypWPFHAG/MainWindow.xaml.cs
index 020e7b2..17895b2 100644
--- a/PrototypWPFHAG/MainWindow.xaml.cs
+++ b/PrototypWPFHAG/MainWindow.xaml.cs
@@ -23,86 +23,100 @@ public partial class MainWindow : MetroWindow
     public MainWindow()
     {
         InitializeComponent();
-       // TestConnection();
-       // Console.ReadKey();
-
     }
 
-    private void loginButton_Click(object sender, RoutedEventArgs e)
+    private void Window_Loaded(object sender, RoutedEventArgs e)
     {
-        // 从用户输入中获取用户名和密码
-        string username = UsernameTextBox.Text;          // 获取用户名
-        string password = PasswordTextBox.Password;      // 获取密码
-
-        // 调用 ValidateUser 方法验证用户凭据
-        if (ValidateUser(username, password))
-        {
-            MessageBox.Show("ok", "Login Successful", MessageBoxButton.OK, MessageBoxImage.Error);
-
-        }
-        else
-        {
-            // 如果验证失败，显示错误信息
-            MessageBox.Show("Invalid username or password.", "Login Failed", MessageBoxButton.OK, MessageBoxImage.Error);
-        }
+        UsernameTextBox.Focus(); // Focus first TextBox on start
     }
 
-    private bool ValidateUser(string username, string password)
+    private static NpgsqlConnection GetConnection()
     {
-        // 获取数据库连接
-        using (var con = GetConnection())
-        {
-            con.Open(); // 打开数据库连接
-            string query = "SELECT COUNT(*) FROM USER WHERE UserName = @username AND Password = @password;";
-
-            using (var cmd = new NpgsqlCommand(query, con))
-            {
-                // 使用参数化查询防止 SQL 注入
-                cmd.Parameters.AddWithValue("@username", username);
-                cmd.Parameters.AddWithValue("@password", password);
-
-                // 执行查询并获取结果
-                int count = (int)cmd.ExecuteScalar();
-                return count > 0; // 如果匹配记录数量大于 0，返回 true
-            }
-        }
+        return new NpgsqlConnection("Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=postgres;");
     }
 
-    private static void TestConnection()
+    private string ValidateUser(string username, string password)
     {
         using (NpgsqlConnection con = GetConnection())
         {
             con.Open();
-            if (con.State == ConnectionState.Open)
+
+            // Check for correct UserName
+            string userQuery = "SELECT COUNT(*) FROM \"User\" WHERE \"UserName\" = @username";
+            using (NpgsqlCommand userCmd = new NpgsqlCommand(userQuery, con))
             {
-                Console.WriteLine("Connected to Server");
+                userCmd.Parameters.AddWithValue("@username", username);
+                int userExists = Convert.ToInt32(userCmd.ExecuteScalar());
+
+                if (userExists == 0)
+                {
+                    return "Dieser Benutzername existiert nicht";
+                }
+            }
+            
+            // Check for correct Password
+            string pwQuery = "SELECT COUNT(*) FROM \"User\" WHERE \"UserName\" = @username AND \"Password\" = @password";
+            using (NpgsqlCommand pwCmd = new NpgsqlCommand(pwQuery, con))
+            {
+                pwCmd.Parameters.AddWithValue("@username", username);
+                pwCmd.Parameters.AddWithValue("@password", password);
+                int correctPassword = Convert.ToInt32(pwCmd.ExecuteScalar());
+
+                if (correctPassword == 0)
+                {
+                    return "Falsches Password!";
+                }
             }
         }
-    }
-    private static NpgsqlConnection GetConnection()
-    {
-        return new NpgsqlConnection(@"Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=postgres;");
+
+        return "Erfolgreich";
     }
 
-    //class Program
-    //{
-    //    static void Main(string[] args)
-    //    {
-    //        TestConnection();
-    //        Console.ReadKey();
-    //    }
-    //    private static void TestConnection()
-    //    {
-    //        using(NpgsqlConnection con = GetConnection()){
-    //            con.Open();
-    //            if (con.State == ConnectionState.Open) {
-    //                Console.WriteLine("Connected to Server");
-    //            }
-    //        }
-    //    }
-    //    private static NpgsqlConnection GetConnection()
-    //    {
-    //        return new NpgsqlConnection(@"Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=TestServer;");
-    //    }
-    //}
+    private void ShowPasswordButton_PreviewMouseDown(object sender, RoutedEventArgs e)
+    {
+        PasswordVisibleTextBox.Text = PasswordTextBox.Password; // Write password in the visible box
+        PasswordVisibleTextBox.Visibility = Visibility.Visible;
+        PasswordTextBox.Visibility = Visibility.Collapsed;
+    }
+
+    private void ShowPasswordButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (PasswordTextBox.Visibility == Visibility.Visible)
+        {
+            // Show password
+            PasswordVisibleTextBox.Text = PasswordTextBox.Password;
+            PasswordVisibleTextBox.Visibility = Visibility.Visible;
+            PasswordTextBox.Visibility = Visibility.Collapsed;
+        }
+        else
+        {
+            // Hide password
+            PasswordTextBox.Visibility = Visibility.Visible;
+            PasswordVisibleTextBox.Visibility = Visibility.Collapsed;
+        }
+    }
+
+    // Syncs password with visible TextBox
+    private void PasswordTextBox_PasswordChanged(object sender, RoutedEventArgs e)
+    {
+        PasswordVisibleTextBox.Text = PasswordTextBox.Password;
+    }
+
+    private void loginButton_Click(object sender, RoutedEventArgs e)
+    {
+        string username = UsernameTextBox.Text;
+        string password = PasswordTextBox.Password;
+        string result = ValidateUser(username, password);
+
+        if (result == "Erfolgreich")
+        {
+            SearchWindow searchWindow = new();
+            searchWindow.Show(); // Open new window
+            this.Close(); // Close this window
+        }
+        else
+        {
+            MessageBox.Show(result, "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
+        }
+    }
 }
\ No newline at end of file
diff --git a/PrototypWPFHAG/PrototypWPFHAG.csproj b/PrototypWPFHAG/PrototypWPFHAG.csproj
index 0db60b9..0422d05 100644
--- a/PrototypWPFHAG/PrototypWPFHAG.csproj
+++ b/PrototypWPFHAG/PrototypWPFHAG.csproj
@@ -4,7 +4,7 @@
 
     <OutputType>WinExe</OutputType>
 
-    <OutputType>Exe</OutputType>
+    <OutputType>WinExe</OutputType>
 
     <TargetFramework>net9.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
diff --git a/PrototypWPFHAG/SuchenFenster.xaml b/PrototypWPFHAG/SearchWindow.xaml
similarity index 74%
rename from PrototypWPFHAG/SuchenFenster.xaml
rename to PrototypWPFHAG/SearchWindow.xaml
index 0106553..72ac88d 100644
--- a/PrototypWPFHAG/SuchenFenster.xaml
+++ b/PrototypWPFHAG/SearchWindow.xaml
@@ -1,7 +1,8 @@
-<Window x:Class="SuchenFenster.MainWindow"
+<Window x:Class="PrototypWPFHAG.SearchWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        Title="Suchen Fenster" Height="600" Width="800">
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
+        xmlns:local="clr-namespace:PrototypWPFHAG"
+        Title="Such Fenster" Height="600" Width="800">
     <Grid>
         <!-- 左侧垂直布局 -->
         <Grid.ColumnDefinitions>
@@ -40,6 +41,7 @@
                 </Border>
                 <Button Content="ADD" Width="60" Height="30" Grid.Column="1" Margin="5,0,0,0"/>
             </Grid>
+            <Button Content="Zurück " Margin="5,380" Click="BackToLogIn_Click"/>
         </StackPanel>
 
         <!-- 右侧区域 -->
@@ -47,19 +49,19 @@
             <Label Content="Zeugnisse:" HorizontalAlignment="Left" Margin="0,2,0,8"/>
             <!-- ListField -->
             <ListBox x:Name="ListField" Margin="0,29,0,35" BorderThickness="1" BorderBrush="Black">
-    <ListBox.ItemTemplate>
-        <DataTemplate>
-            <StackPanel Orientation="Vertical">
-                <!-- 内容 -->
-                <TextBlock Text="{Binding}" VerticalAlignment="Center" HorizontalAlignment="Stretch" Padding="5"/>
-                <!-- 分隔线 -->
-                <Border Height="1" Background="Black" Margin="0,2,0,2"/>
-            </StackPanel>
-        </DataTemplate>
-    </ListBox.ItemTemplate>
-</ListBox>
+                <ListBox.ItemTemplate>
+                    <DataTemplate>
+                        <StackPanel Orientation="Vertical">
+                            <!-- 内容 -->
+                            <TextBlock Text="{Binding}" VerticalAlignment="Center" HorizontalAlignment="Stretch" Padding="5"/>
+                            <!-- 分隔线 -->
+                            <Border Height="1" Background="Black" Margin="0,2,0,2"/>
+                        </StackPanel>
+                    </DataTemplate>
+                </ListBox.ItemTemplate>
+            </ListBox>
+
 
-           
             <!-- 删除按钮 -->
             <Button Content="Löschen" Width="100" Height="30" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>
         </Grid>
diff --git a/PrototypWPFHAG/SearchWindow.xaml.cs b/PrototypWPFHAG/SearchWindow.xaml.cs
new file mode 100644
index 0000000..ed81b01
--- /dev/null
+++ b/PrototypWPFHAG/SearchWindow.xaml.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace PrototypWPFHAG
+{
+    /// <summary>
+    /// Interaktionslogik für SearchWindow.xaml
+    /// </summary>
+    public partial class SearchWindow : Window
+    {
+        public SearchWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void BackToLogIn_Click(object sender, RoutedEventArgs e)
+        {
+                MainWindow loginWindow = new();
+                loginWindow.Show(); // Open new window
+                this.Close(); // Close this window
+        }
+    }
+}
diff --git a/PrototypWPFHAG/SuchenFenster.xaml.cs b/PrototypWPFHAG/SuchenFenster.xaml.cs
deleted file mode 100644
index 5f28270..0000000
--- a/PrototypWPFHAG/SuchenFenster.xaml.cs
+++ /dev/null
@@ -1 +0,0 @@
-
\ No newline at end of file