#pragma once

#include "PanelWidget.hpp"
#include "CanvasPanelSlot.hpp"

namespace PalUIExtension::Api
{
    // UCanvasPanel adds exactly one function of its own. Everything else
    // it offers comes from UPanelWidget and UWidget, which is now inherited
    // rather than re-declared.
    class CanvasPanel : public PanelWidget
    {
    public:
        static auto ClassPath() -> const TCHAR* { return STR("/Script/UMG.CanvasPanel"); }
        static auto DebugTag()  -> const TCHAR* { return STR("Canvas"); }

        CanvasPanel() = default;
        explicit CanvasPanel(UObject* Obj)
            : PanelWidget(Obj, ClassOf<CanvasPanel>(), DebugTag()) {}

        // Returns an invalid CanvasPanelSlot if the call failed or the
        // engine handed back null. Check it before using it -- the wrapper
        // will refuse to dispatch and log, but silently doing nothing is
        // not what you want out of a layout call.
        auto AddChildToCanvas(UObject* Content) -> CanvasPanelSlot
        {
            struct P { UObject* Content; UObject* ReturnValue; } p{ Content, nullptr };
            auto Result = CallForReturn(STR("AddChildToCanvas"), p, &P::ReturnValue);
            return (Result && *Result) ? CanvasPanelSlot{ *Result } : CanvasPanelSlot{};
        }
    };
}