namespace WPFluent.Markup;

/// <summary>
/// Custom design time attributes based on Marcin Najder implementation.
/// </summary>
/// <example>
/// <code lang="xml"> /// &lt;ui:FluentWindow ///     xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml" ///    
/// ui:Design.Background="{DynamicResource ApplicationBackgroundBrush}" ///     ui:Design.Foreground="{DynamicResource
/// TextFillColorPrimaryBrush}"&gt; ///     &lt;Button Content="Hello World" /&gt; /// &lt;/FluentWindow&gt; ///</code>
/// </example>
public static class Design
{
    private static bool? _inDesignMode;
    private static readonly string[] DesignProcesses =
    [
        "devenv",
        "dotnet",
        "RiderWpfPreviewerLauncher64"
    ];

    public static readonly DependencyProperty BackgroundProperty = DependencyProperty.RegisterAttached(
        "Background",
        typeof(System.Windows.Media.Brush),
        typeof(Design),
        new PropertyMetadata(OnBackgroundChanged));

    public static readonly DependencyProperty ForegroundProperty = DependencyProperty.RegisterAttached(
        "Foreground",
        typeof(System.Windows.Media.Brush),
        typeof(Design),
        new PropertyMetadata(OnForegroundChanged));

    private static void OnBackgroundChanged(DependencyObject? d, DependencyPropertyChangedEventArgs e)
    {
        if(!InDesignMode)
        {
            return;
        }

        d?.GetType()?.GetProperty("Background")?.SetValue(d, e.NewValue, null);
    }

    private static void OnForegroundChanged(DependencyObject? d, DependencyPropertyChangedEventArgs e)
    {
        if(!InDesignMode)
        {
            return;
        }

        d?.GetType()?.GetProperty("Foreground")?.SetValue(d, e.NewValue, null);
    }

    /// <summary>
    /// Gets a value indicating whether the framework is in design-time mode. (Caliburn.Micro implementation)
    /// </summary>
    private static bool InDesignMode => _inDesignMode ??=
            (bool)
            DependencyPropertyDescriptor
                .FromProperty(DesignerProperties.IsInDesignModeProperty, typeof(FrameworkElement))
            .Metadata.DefaultValue ||
        DesignProcesses.Any(
            process => System
                .Diagnostics.Process
                .GetCurrentProcess()
                .ProcessName
                .StartsWith(process, StringComparison.Ordinal));

    /// <summary>
    /// Helper for getting <see cref="BackgroundProperty"/> from <paramref name="dependencyObject"/>.
    /// </summary>
    /// <param name="dependencyObject"><see cref="DependencyObject"/> to read <see cref="BackgroundProperty"/> from.</param>
    /// <returns>Background property value.</returns>
    [System.Diagnostics.CodeAnalysis.SuppressMessage(
        "WpfAnalyzers.DependencyProperty",
        "WPF0033:Add [AttachedPropertyBrowsableForType]",
        Justification = "Because")]
    public static System.Windows.Media.Brush? GetBackground(DependencyObject dependencyObject) => (System.Windows.Media.Brush)dependencyObject.GetValue(
        BackgroundProperty);

    /// <summary>
    /// Helper for getting <see cref="ForegroundProperty"/> from <paramref name="dependencyObject"/>.
    /// </summary>
    /// <param name="dependencyObject"><see cref="DependencyObject"/> to read <see cref="ForegroundProperty"/> from.</param>
    /// <returns>Foreground property value.</returns>
    [System.Diagnostics.CodeAnalysis.SuppressMessage(
        "WpfAnalyzers.DependencyProperty",
        "WPF0033:Add [AttachedPropertyBrowsableForType]",
        Justification = "Because")]
    public static System.Windows.Media.Brush? GetForeground(DependencyObject dependencyObject) => (System.Windows.Media.Brush)dependencyObject.GetValue(
        ForegroundProperty);

    /// <summary>
    /// Helper for setting <see cref="BackgroundProperty"/> on <paramref name="dependencyObject"/>.
    /// </summary>
    /// <param name="dependencyObject"><see cref="DependencyObject"/> to set <see cref="BackgroundProperty"/> on.</param>
    /// <param name="value">Background property value.</param>
    public static void SetBackground(DependencyObject dependencyObject, System.Windows.Media.Brush? value) => dependencyObject.SetValue(
        BackgroundProperty,
        value);

    /// <summary>
    /// Helper for setting <see cref="ForegroundProperty"/> on <paramref name="dependencyObject"/>.
    /// </summary>
    /// <param name="dependencyObject"><see cref="DependencyObject"/> to set <see cref="ForegroundProperty"/> on.</param>
    /// <param name="value">Foreground property value.</param>
    public static void SetForeground(DependencyObject dependencyObject, System.Windows.Media.Brush? value) => dependencyObject.SetValue(
        ForegroundProperty,
        value);
}