MainWindow.xaml

<Window x:Class="NetworkSpeedTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:conv="clr-namespace:NetworkSpeedTest.Converters"
        Title="Network Speed Test" Height="780" Width="850"
        WindowStartupLocation="CenterScreen" Background="#FF1A1A2E">
    <Window.Resources>
        <conv:BooleanToVisibilityConverter x:Key="BoolToVis"/>
        <conv:InverseBooleanConverter x:Key="InverseBool"/>

        <Style x:Key="DarkLabel" TargetType="TextBlock">
            <Setter Property="Foreground" Value="#FFCCCCCC"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="Margin" Value="0,0,8,0"/>
        </Style>
        <Style x:Key="DarkTextBox" TargetType="TextBox">
            <Setter Property="Background" Value="#FF0F3460"/>
            <Setter Property="Foreground" Value="#FFFFFFFF"/>
            <Setter Property="BorderBrush" Value="#FF1A5276"/>
            <Setter Property="Padding" Value="6,4"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
        </Style>
        <Style x:Key="AccentButton" TargetType="Button">
            <Setter Property="Background" Value="#FF00D4FF"/>
            <Setter Property="Foreground" Value="#FF0A0A1A"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="Padding" Value="20,8"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Cursor" Value="Hand"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border Background="{TemplateBinding Background}" CornerRadius="4" Padding="{TemplateBinding Padding}">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="#FF00BFEA"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Background" Value="#FF555555"/>
                                <Setter Property="Foreground" Value="#FF999999"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="StopButton" TargetType="Button">
            <Setter Property="Background" Value="#FFE74C3C"/>
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="Padding" Value="20,8"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Cursor" Value="Hand"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border Background="{TemplateBinding Background}" CornerRadius="4" Padding="{TemplateBinding Padding}">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="#FFC0392B"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Background" Value="#FF555555"/>
                                <Setter Property="Foreground" Value="#FF999999"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

    <Grid Margin="20">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <!-- Title -->
        <TextBlock Grid.Row="0" Text="Network Speed Test" FontSize="24" FontWeight="Bold"
                   Foreground="#FF00D4FF" HorizontalAlignment="Center" Margin="0,0,0,15"/>

        <!-- Mode Selection -->
        <TabControl Grid.Row="1" x:Name="ModeTab" Background="#FF16213E" Foreground="#FFCCCCCC"
                    BorderBrush="#FF0F3460" Margin="0,0,0,15" SelectionChanged="ModeTab_SelectionChanged">
            <!-- Server Tab -->
            <TabItem Header="  Server Mode  " Background="#FF16213E" Foreground="#FFCCCCCC">
                <StackPanel Margin="15">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="100"/>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="Listen Port:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="1" x:Name="ServerPortBox" Text="5201" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <Button Grid.Column="3" x:Name="StartServerBtn" Content="Start Server" Style="{StaticResource AccentButton}"
                                Click="StartServerBtn_Click" Margin="0,0,8,0"/>
                        <Button Grid.Column="4" x:Name="StopServerBtn" Content="Stop Server" Style="{StaticResource StopButton}"
                                Click="StopServerBtn_Click" IsEnabled="False"/>
                    </Grid>
                </StackPanel>
            </TabItem>

            <!-- Client Tab -->
            <TabItem Header="  Client Mode  " Background="#FF16213E" Foreground="#FFCCCCCC">
                <StackPanel Margin="15">
                    <Grid Margin="0,0,0,10">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="80"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="Target IP:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="1" x:Name="TargetIpBox" Text="127.0.0.1" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <TextBlock Grid.Column="2" Text="Port:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="3" x:Name="ClientPortBox" Text="5201" Style="{StaticResource DarkTextBox}"/>
                    </Grid>
                    <Grid Margin="0,0,0,10">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="60"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="60"/>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="Threads:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="1" x:Name="ThreadCountBox" Text="8" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <TextBlock Grid.Column="2" Text="Duration (s):" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="3" x:Name="DurationBox" Text="10" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <CheckBox Grid.Column="5" x:Name="BidirectionalCheck" Content="Bidirectional"
                                  Foreground="#FFCCCCCC" VerticalAlignment="Center" IsChecked="True"/>
                    </Grid>
                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                        <Button x:Name="StartTestBtn" Content="Start Test" Style="{StaticResource AccentButton}"
                                Click="StartTestBtn_Click" Margin="0,0,8,0"/>
                        <Button x:Name="StopTestBtn" Content="Stop Test" Style="{StaticResource StopButton}"
                                Click="StopTestBtn_Click" IsEnabled="False"/>
                    </StackPanel>
                </StackPanel>
            </TabItem>

            <!-- Latency Test Tab -->
            <TabItem Header="  Latency Test  " Background="#FF16213E" Foreground="#FFCCCCCC">
                <StackPanel Margin="15">
                    <Grid Margin="0,0,0,10">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="80"/>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="60"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="Target IP:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="1" x:Name="LatencyTargetBox" Text="127.0.0.1" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <TextBlock Grid.Column="2" Text="Port:" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="3" x:Name="LatencyPortBox" Text="5201" Style="{StaticResource DarkTextBox}" Margin="0,0,15,0"/>
                        <TextBlock Grid.Column="4" Text="Duration (s):" Style="{StaticResource DarkLabel}"/>
                        <TextBox Grid.Column="5" x:Name="LatencyDurationBox" Text="10" Style="{StaticResource DarkTextBox}"/>
                    </Grid>
                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                        <Button x:Name="StartLatencyBtn" Content="Start Latency Test" Style="{StaticResource AccentButton}"
                                Click="StartLatencyBtn_Click" Margin="0,0,8,0"/>
                        <Button x:Name="StopLatencyBtn" Content="Stop" Style="{StaticResource StopButton}"
                                Click="StopLatencyBtn_Click" IsEnabled="False"/>
                    </StackPanel>
                </StackPanel>
            </TabItem>
        </TabControl>

        <!-- Throughput Results Panel -->
        <Grid Grid.Row="2" x:Name="ThroughputResultsPanel" Margin="0,0,0,10">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>

            <Border Grid.Column="0" Background="#FF16213E" CornerRadius="8" Padding="15" Margin="0,0,8,0"
                    BorderBrush="#FF0F3460" BorderThickness="1">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock Text="Download" Foreground="#FF00D4FF" FontWeight="Bold" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,0,0,5"/>
                    <TextBlock x:Name="DownloadSpeedMB" Text="-- MB/s" Foreground="White" FontSize="28"
                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    <TextBlock x:Name="DownloadSpeedMbps" Text="-- Mbps" Foreground="#FF888888" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>

            <Border Grid.Column="1" Background="#FF16213E" CornerRadius="8" Padding="15" Margin="8,0,8,0"
                    BorderBrush="#FF0F3460" BorderThickness="1">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock Text="Upload" Foreground="#FFE74C3C" FontWeight="Bold" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,0,0,5"/>
                    <TextBlock x:Name="UploadSpeedMB" Text="-- MB/s" Foreground="White" FontSize="28"
                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    <TextBlock x:Name="UploadSpeedMbps" Text="-- Mbps" Foreground="#FF888888" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>

            <Border Grid.Column="2" x:Name="AsymmetryWarning" Background="#FF4A3520" CornerRadius="8"
                    Padding="12" BorderBrush="#FFE67E22" BorderThickness="1" Visibility="Collapsed"
                    VerticalAlignment="Center" MinWidth="130">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock Text="ASYMMETRY" Foreground="#FFF39C12" FontWeight="Bold" FontSize="12"
                               HorizontalAlignment="Center"/>
                    <TextBlock x:Name="AsymmetryPercent" Text="" Foreground="#FFF39C12" FontSize="18"
                               FontWeight="Bold" HorizontalAlignment="Center" Margin="0,3,0,0"/>
                    <TextBlock Text="Check NIC" Foreground="#FFCC8833" FontSize="10"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>
        </Grid>

        <!-- Latency Results Panel -->
        <Grid Grid.Row="2" x:Name="LatencyResultsPanel" Margin="0,0,0,10" Visibility="Collapsed">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <Border Grid.Column="0" x:Name="LatencyCard" Background="#FF16213E" CornerRadius="8" Padding="15" Margin="0,0,8,0"
                    BorderBrush="#FF0F3460" BorderThickness="2">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock x:Name="LatencyCardTitle" Text="Latency" Foreground="#FF2ECC71" FontWeight="Bold" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,0,0,5"/>
                    <TextBlock x:Name="LatencyAvgText" Text="-- ms" Foreground="White" FontSize="28"
                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    <TextBlock x:Name="LatencyMinMaxText" Text="min -- / max --" Foreground="#FF888888" FontSize="12"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>

            <Border Grid.Column="1" x:Name="JitterCard" Background="#FF16213E" CornerRadius="8" Padding="15" Margin="8,0,8,0"
                    BorderBrush="#FF0F3460" BorderThickness="2">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock x:Name="JitterCardTitle" Text="Jitter" Foreground="#FF2ECC71" FontWeight="Bold" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,0,0,5"/>
                    <TextBlock x:Name="JitterText" Text="-- ms" Foreground="White" FontSize="28"
                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    <TextBlock Text="Inter-packet variation" Foreground="#FF888888" FontSize="12"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>

            <Border Grid.Column="2" x:Name="LossCard" Background="#FF16213E" CornerRadius="8" Padding="15" Margin="8,0,0,0"
                    BorderBrush="#FF0F3460" BorderThickness="2">
                <StackPanel HorizontalAlignment="Center">
                    <TextBlock x:Name="LossCardTitle" Text="Packet Loss" Foreground="#FF2ECC71" FontWeight="Bold" FontSize="14"
                               HorizontalAlignment="Center" Margin="0,0,0,5"/>
                    <TextBlock x:Name="LossText" Text="-- %" Foreground="White" FontSize="28"
                               FontWeight="Bold" HorizontalAlignment="Center"/>
                    <TextBlock x:Name="LossDetailText" Text="--/-- received" Foreground="#FF888888" FontSize="12"
                               HorizontalAlignment="Center" Margin="0,2,0,0"/>
                </StackPanel>
            </Border>
        </Grid>

        <!-- Progress Bar -->
        <Grid Grid.Row="3" Margin="0,0,0,10">
            <ProgressBar x:Name="TestProgress" Height="22" Minimum="0" Maximum="100" Value="0"
                         Background="#FF0F3460" Foreground="#FF00D4FF" BorderThickness="0"/>
            <TextBlock x:Name="ProgressText" Text="Ready" Foreground="White" FontSize="11"
                       HorizontalAlignment="Center" VerticalAlignment="Center"/>
        </Grid>

        <!-- Output Folder Row -->
        <Grid Grid.Row="4" Margin="0,0,0,8">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0" Text="Report Folder:" Style="{StaticResource DarkLabel}"/>
            <TextBox Grid.Column="1" x:Name="OutputFolderBox" Style="{StaticResource DarkTextBox}" IsReadOnly="True"
                     Text="" Margin="0,0,8,0"/>
            <Button Grid.Column="2" x:Name="BrowseFolderBtn" Content="Browse..." Style="{StaticResource AccentButton}"
                    Click="BrowseFolderBtn_Click" Padding="12,6"/>
        </Grid>

        <!-- Status Log -->
        <Border Grid.Row="5" Background="#FF16213E" CornerRadius="8" BorderBrush="#FF0F3460" BorderThickness="1"
                Padding="5" Margin="0,0,0,10">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <TextBlock Grid.Row="0" Text="Status Log" Foreground="#FF888888" FontSize="11" Margin="5,2,0,5"/>
                <ListBox Grid.Row="1" x:Name="StatusLog" Background="Transparent" Foreground="#FFAAAAAA"
                         BorderThickness="0" FontFamily="Consolas" FontSize="12"
                         ScrollViewer.HorizontalScrollBarVisibility="Disabled">
                    <ListBox.ItemContainerStyle>
                        <Style TargetType="ListBoxItem">
                            <Setter Property="Padding" Value="5,2"/>
                            <Setter Property="Foreground" Value="#FFAAAAAA"/>
                        </Style>
                    </ListBox.ItemContainerStyle>
                </ListBox>
            </Grid>
        </Border>

        <!-- Generate Report Button -->
        <Button Grid.Row="6" x:Name="GenerateReportBtn" Content="Generate Report"
                Style="{StaticResource AccentButton}" Click="GenerateReportBtn_Click"
                HorizontalAlignment="Stretch" Padding="20,10" FontSize="14"/>
    </Grid>
</Window>