namespace AcDream.App.UI;

/// <summary>
/// Retail <c>UIOption_CheckboxSlider</c> (Type <c>0x10000036</c>) — a combined
/// toggle + slider option row (e.g. the Config tab's "Sound / Volume" pair: an
/// on/off LED plus a volume slider in one row). The dat class id lands on the
/// composite ROW'S OWN element (research doc §1.1: "row child element looked up —
/// the row root itself"), and the row authors NO media of its own; its content is
/// two NESTED option widgets — a <c>UIOption_Checkbox</c> child (dat id
/// <c>0x10000219</c> in every observed template) and a <c>UIOption_Slider</c> child
/// (<c>0x1000021C</c>) — verified against the regenerated <c>options_2100002B.json</c>
/// fixture's template elements <c>0x10000220</c>/<c>0x10000221</c>.
///
/// <para>
/// This widget does <b>not</b> consume its dat children: they build the ordinary
/// recursive way through <c>DatWidgetFactory</c>'s EXISTING checkbox (<c>0x10000035</c>
/// → <see cref="UiButton"/> via <c>BuildCheckbox</c>) and slider (<c>0x10000037</c> →
/// <see cref="UiScrollbar"/> via <c>BuildScrollbar</c>) mappings — no new drawing code,
/// per the campaign contract's "compose existing primitives" directive. Once the
/// subtree is attached (<see cref="IUiChildrenAttachedListener"/>), this widget just
/// grabs references to the two composed children for a page controller to bind
/// against directly instead of re-deriving them from child order/type.
/// </para>
/// </summary>
public sealed class UiOptionToggleSlider : UiElement, IUiChildrenAttachedListener
{
    /// <summary>The composed checkbox (retail's LED half of the row).</summary>
    public UiButton? Toggle { get; private set; }

    /// <summary>The composed slider (retail's scalar half of the row).</summary>
    public UiScrollbar? Slider { get; private set; }

    public void OnChildrenAttached()
    {
        foreach (UiElement child in Children)
        {
            if (Toggle is null && child is UiButton button)
                Toggle = button;
            else if (Slider is null && child is UiScrollbar scrollbar)
                Slider = scrollbar;
        }
    }
}