using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.Events;

namespace Lemon.GenericLib.SceneManagement {
    public class SceneTransition : MonoBehaviour
    {
        public static SceneTransition Instance;


        //singleton pattern
        private void Awake()
        {
            if (Instance == null)
            {
                Instance = this;
            }

            if (Instance != this)
            {
                Destroy(gameObject);
            }

        }

        [SerializeField] float transitionTime;
        //[SerializeField] UITransitionAnimator transitionAnimator;
        [SerializeField] bool enableStartingTransition = true;

        [SerializeField] UnityEvent transitionEnterFunction;
        [SerializeField] UnityEvent transitionExitFunction;


        private bool isTransitionAvailable = true;

        // Start is called before the first frame update
        void Start()
        {

            if (enableStartingTransition)
            {
                isTransitionAvailable = false;
                transitionEnterFunction?.Invoke();
                //transitionAnimator.TransitionIn();
                StartCoroutine(EnableTransition());
            }

        }

        public void TransitionScene(int sceneIndex)
        {
            if (!isTransitionAvailable) return;
            isTransitionAvailable = false;
            transitionExitFunction?.Invoke();
            //transitionAnimator.TransitionOut();
            StartCoroutine(LoadScene(sceneIndex));
        }

        public void TransitionScene(string sceneName)
        {
            if (!isTransitionAvailable) return;
            isTransitionAvailable = false;
            transitionExitFunction?.Invoke();
            //transitionAnimator.TransitionOut();
            StartCoroutine(LoadScene(sceneName));
        }

        public void RestartScene()
        {
            TransitionScene(SceneManager.GetActiveScene().buildIndex);
        }

        public void QuitGame()
        {
            transitionExitFunction?.Invoke();
            StartCoroutine(QuitGameRoutine());
        }

        public void TransitionNextScene()
        {
            if (!isTransitionAvailable) return;
            isTransitionAvailable = false;
            transitionExitFunction?.Invoke();
            //transitionAnimator.TransitionOut();
            StartCoroutine(LoadScene(SceneManager.GetActiveScene().buildIndex + 1));
        }
        public void TransitionPreviousScene()
        {
            if (!isTransitionAvailable) return;
            isTransitionAvailable = false;
            transitionExitFunction?.Invoke();
            //transitionAnimator.TransitionOut();
            StartCoroutine(LoadScene(SceneManager.GetActiveScene().buildIndex - 1));
        }

        public void TransitionScene(int sceneIndex, bool useAnimation = true)
        {
            transitionExitFunction?.Invoke();
            // transitionAnimator.TransitionOut();
            StartCoroutine(LoadScene(sceneIndex));
        }

        IEnumerator LoadScene(int sceneIndex)
        {
            yield return new WaitForSeconds(transitionTime);
            SceneManager.LoadScene(sceneIndex);
        }

        IEnumerator LoadScene(string sceneName)
        {
            yield return new WaitForSeconds(transitionTime);
            SceneManager.LoadScene(sceneName);
        }

        IEnumerator EnableTransition()
        {
            yield return new WaitForSeconds(transitionTime);
            isTransitionAvailable = true;
        }

        IEnumerator QuitGameRoutine()
        {
            yield return new WaitForSeconds(transitionTime);
            Application.Quit();
        }
    }
}