using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.EventSystems;

namespace HPJ.Examples
{
    public class SceneLoader : MonoBehaviour
    {
        private void Update()
        {
            if (EventSystem.current.currentSelectedGameObject != null)
            {
                return;
            }

            if (Input.GetKeyDown(KeyCode.KeypadMinus))
            {
                LoadPreviousScene();
            }
            else if (Input.GetKeyDown(KeyCode.KeypadPlus))
            {
                LoadNextScene();
            }
        }

        public void LoadNextScene()
        {
            int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;
            int nextSceneIndex = currentSceneIndex + 1;
            if (nextSceneIndex == SceneManager.sceneCountInBuildSettings)
            {
                nextSceneIndex = 0;
            }
            SceneManager.LoadScene(nextSceneIndex);
        }

        public void LoadPreviousScene()
        {
            int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;
            int previousSceneIndex = currentSceneIndex - 1;
            if (previousSceneIndex < 0)
            {
                previousSceneIndex = SceneManager.sceneCountInBuildSettings - 1;
            }
            SceneManager.LoadScene(previousSceneIndex);
        }
    }
}