using WPFluent.Appearance;

using System.Windows.Markup;

namespace WPFluent.Markup;

/// <summary>
/// Provides a dictionary implementation that contains <c>WPF UI</c> theme resources used by components and other
/// elements of a WPF application.
/// </summary>
/// <example>
/// <code lang="xml"> /// &lt;Application ///     xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"&gt; ///    
/// &lt;Application.Resources&gt; ///         &lt;ResourceDictionary&gt; ///            
/// &lt;ResourceDictionary.MergedDictionaries&gt; ///                 &lt;ui:ThemesDictionary Theme = "Dark" /&gt; ///  
///           &lt;/ResourceDictionary.MergedDictionaries&gt; ///         &lt;/ResourceDictionary&gt; ///    
/// &lt;/Application.Resources&gt; /// &lt;/Application&gt; ///</code>
/// </example>
[Localizability(LocalizationCategory.Ignore)]
[Ambient]
[UsableDuringInitialization(true)]
public class ThemesDictionary : ResourceDictionary
{
    public ThemesDictionary() { SetSourceBasedOnSelectedTheme(ApplicationTheme.Light); }

    private void SetSourceBasedOnSelectedTheme(ApplicationTheme? selectedApplicationTheme)
    {
        var themeName = selectedApplicationTheme switch
        {
            ApplicationTheme.Dark => "Dark",
            ApplicationTheme.HighContrast => "HighContrast",
            _ => "Light",
        };

        Source = new Uri($"{ApplicationThemeManager.ThemesDictionaryPath}{themeName}.xaml", UriKind.Absolute);
    }

    /// <summary>
    /// Sets the default application theme.
    /// </summary>
    public ApplicationTheme Theme { set => SetSourceBasedOnSelectedTheme(value); }
}