namespace BetterUI;

/// <summary>
/// A panel that implements the <see cref="IThemeEvent"/> interface. This panel
/// will automatically receive the <see cref="IThemeEvent.OnThemeChanged"/> event
/// when the theme is changed.
/// </summary>
/// <remarks>
/// This is a base class for panels that need to be notified when the theme is
/// changed. It provides a <see cref="ThemeProvider"/> that is automatically
/// bound to the global theme.
/// </remarks>
public abstract class ThemePanel : Panel, IThemeEvent
{
	/// <summary>
	/// The theme provider that this panel is bound to.
	/// </summary>
	/// <remarks>
	/// This is a cascading property that will automatically inherit the
	/// global theme.
	/// </remarks>
	[CascadingProperty]
	protected ThemeProvider Provider { get; set; } = null!;

	/// <summary>
	/// Called every tick to update the theme class.
	/// </summary>
	public override void Tick()
	{
		BindClass( "light", () => Provider.Theme is Theme.Light );
		BindClass( "dark", () => Provider.Theme is Theme.Dark );
	}

	/// <summary>
	/// Sets the theme of the provider.
	/// </summary>
	/// <param name="theme">The theme to set.</param>
	protected void SetTheme( Theme theme )
	{
		Provider.SetTheme( theme );
	}

	/// <summary>
	/// Switches the theme of the provider between light and dark.
	/// </summary>
	protected void SwitchTheme()
	{
		Provider.SwitchTheme();
	}

	/// <summary>
	/// Called when the theme is changed.
	/// </summary>
	protected virtual void OnThemeChanged() { }

	/// <inheritdoc />
	void IThemeEvent.OnThemeChanged( Theme theme )
	{
		OnThemeChanged();
	}
}