using System.Windows.Markup;

namespace WPFluent.Markup;

/// <summary>
/// Class for Xaml markup extension for static resource references.
/// </summary>
/// <example>
/// <code lang="xml"> /// &lt;ui:Button ///     Appearance="Primary" ///     Content="WPF UI button with font icon" /// 
///    Foreground={ui:ThemeResource SystemAccentColorPrimaryBrush} /&gt; ///</code> <code lang="xml"> /// &lt;ui:TextBox
/// Foreground={ui:ThemeResource TextFillColorSecondaryBrush} /&gt; ///</code>
/// </example>
[TypeConverter(typeof(DynamicResourceExtensionConverter))]
[ContentProperty(nameof(ResourceKey))]
[MarkupExtensionReturnType(typeof(object))]
public class ThemeResourceExtension : DynamicResourceExtension
{
    /// <summary>
    /// Initializes a new instance of the <see cref="ThemeResourceExtension"/> class.
    /// </summary>
    public ThemeResourceExtension() { ResourceKey = ThemeResource.ApplicationBackgroundBrush.ToString(); }

    /// <summary>
    /// Initializes a new instance of the <see cref="ThemeResourceExtension"/> class. Takes the resource key that this
    /// is a static reference to.
    /// </summary>
    public ThemeResourceExtension(ThemeResource resourceKey)
    {
        if(resourceKey == ThemeResource.Unknown)
        {
            throw new ArgumentNullException(nameof(resourceKey));
        }

        ResourceKey = resourceKey.ToString();
    }
}