#include "gui/uisystems.hpp"
#include "gui/guecstra.hpp"

namespace UISystem {
  std::optional<guecs::Entity> loot_grab(guecs::UI& gui, guecs::Entity gui_id) {
    if(auto source = gui.get_if<guecs::GrabSource>(gui_id)) {
      source->grab();
      return gui_id;
    } else {
      return std::nullopt;
    }
  }

  bool loot_drop(guecs::UI& source, guecs::UI& target, guecs::Entity source_id, guecs::Entity target_id) {
    auto& drop = target.get<guecs::DropTarget>(target_id);
    auto& grab = source.get<guecs::GrabSource>(source_id);

    if(drop.commit(grab.world_entity)) {
      grab.commit();
      return true;
    } else {
      return false;
    }
  }
}