#pragma once

#include <unordered_map>
#include <vector>
#include <memory>
#include <optional>

#include <XCEngine/Core/Event.h>
#include <XCEngine/Components/GameObject.h>
#include <XCEngine/Scene/Scene.h>

namespace XCEngine {
namespace Editor {

class EditorSceneManager {
public:
    static EditorSceneManager& Get() {
        static EditorSceneManager instance;
        return instance;
    }

    ::XCEngine::Components::GameObject* CreateEntity(const std::string& name, ::XCEngine::Components::GameObject* parent = nullptr);

    ::XCEngine::Components::GameObject* GetEntity(::XCEngine::Components::GameObject::ID id) {
        return m_scene ? m_scene->Find(std::to_string(id)) : nullptr;
    }

    const ::XCEngine::Components::GameObject* GetEntity(::XCEngine::Components::GameObject::ID id) const {
        return m_scene ? m_scene->Find(std::to_string(id)) : nullptr;
    }

    const std::vector<::XCEngine::Components::GameObject*>& GetRootEntities() const {
        return m_rootEntities;
    }

    void DeleteEntity(::XCEngine::Components::GameObject::ID id);

    void RenameEntity(::XCEngine::Components::GameObject::ID id, const std::string& newName) {
        if (auto* entity = GetEntity(id)) {
            entity->SetName(newName);
            OnEntityChanged.Invoke(id);
        }
    }

    void CopyEntity(::XCEngine::Components::GameObject::ID id);
    ::XCEngine::Components::GameObject::ID PasteEntity(::XCEngine::Components::GameObject::ID parent = 0);
    ::XCEngine::Components::GameObject::ID DuplicateEntity(::XCEngine::Components::GameObject::ID id);
    void MoveEntity(::XCEngine::Components::GameObject::ID id, ::XCEngine::Components::GameObject::ID newParent);

    void CreateDemoScene();

    bool HasClipboardData() const { return m_clipboard.has_value(); }

    ::XCEngine::Core::Event<::XCEngine::Components::GameObject::ID> OnEntityCreated;
    ::XCEngine::Core::Event<::XCEngine::Components::GameObject::ID> OnEntityDeleted;
    ::XCEngine::Core::Event<::XCEngine::Components::GameObject::ID> OnEntityChanged;
    ::XCEngine::Core::Event<> OnSceneChanged;

private:
    EditorSceneManager() = default;

    struct ClipboardData {
        std::string name;
        std::vector<std::unique_ptr<::XCEngine::Components::Component>> components;
        std::vector<ClipboardData> children;
    };

    ClipboardData CopyEntityRecursive(const ::XCEngine::Components::GameObject* entity);
    ::XCEngine::Components::GameObject::ID PasteEntityRecursive(const ClipboardData& data, ::XCEngine::Components::GameObject::ID parent);

    ::XCEngine::Components::Scene* m_scene = nullptr;
    std::vector<::XCEngine::Components::GameObject*> m_rootEntities;
    std::optional<ClipboardData> m_clipboard;
};

}
}