EntityHierarchy.hpp

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#pragma once
 
#include <functional>
#include <map>
#include <ranges>
#include <set>
 
#include <Common/TypeInfo.hpp>
#include <ECS/Entity.hpp>
#include <JobSystem/Requirements.hpp>
 
namespace shkyera {
 
class EntityHierarchy : public ResourceTag {
 public:
  using Children = std::set<Entity>;
 
  EntityHierarchy() = default;
 
  ~EntityHierarchy() = default;
 
  void attributeChild(Entity parent, Entity child);
 
  void removeFromParent(Entity child);
 
  std::optional<Entity> getParent(Entity child) const;
 
  const Children& getChildren(Entity parent) const;
 
  const auto& getParentToChild() const { return _parentToChildren; }
 
 private:
  bool isAncestor(Entity entity, Entity ancestor) const;
 
  std::map<Entity, Children> _parentToChildren;
  std::map<Entity, Entity> _childToParent;
};
 
}  // namespace shkyera