using System;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
using TMPro;
using System.Collections;
using System.Threading;
using Cysharp.Threading.Tasks;

namespace BrewMonster
{
    public class LoadingSceneController : MonoSingleton<LoadingSceneController>
    {
        [Header("UI")]
        public GameObject goContent;
        public Slider progressBar;
        public TMP_Text percentText;
        public TMP_Text loadingText;

        private bool finished;
        private CancellationTokenSource cts;

        private float _progress;

        public void SetProgress(float progress)
        {
            _progress = progress;
        }

        public void ShowLoadingScene(bool active)
        {
            goContent.SetActive(active);

            // if (active)
            // {
            //     Debug.LogError("Loading scene controller started");
            //
            //     finished = false;
            //     loadingText.text = "Loading...";
            //     UpdateUI(0);
            //
            //     cts?.Cancel();
            //     cts = new CancellationTokenSource();
            //
            //     ObserveLoadingAsync(cts.Token).Forget();
            // }
            // else
            // {
            //     cts?.Cancel();
            // }
        }

        async UniTaskVoid ObserveLoadingAsync(CancellationToken token)
        {
            try
            {
                while (!finished && !token.IsCancellationRequested)
                {
                    float progress = Mathf.Clamp01(SceneLoader.LoadingProgress / 100f);
                    UpdateUI(progress);

                    if (SceneLoader.SceneLoadProcess == SceneLoadProcess.EndLoading)
                    {
                        finished = true;
                        await EndLoadingAsync(token);
                        break;
                    }

                    await UniTask.Yield(PlayerLoopTiming.Update, token);
                }
            }
            catch (OperationCanceledException)
            {
                // Normal cancel – ignore
            }
        }

        async UniTask EndLoadingAsync(CancellationToken token)
        {
            UpdateUI(1f);
            loadingText.text = "Entering scene...";

            await UniTask.Delay(TimeSpan.FromSeconds(0.2f), cancellationToken: token);

            ShowLoadingScene(false);
        }

        public void UpdateUI(float progress)
        {
            progressBar.value = progress;
            percentText.text = $"{Mathf.RoundToInt(progress * 100f)}%";
        }
        public void SetLoadingText(string content)
        {
            loadingText.text = content;
        }

        void Update()
        {
            UpdateUI(_progress);
        }
    }
}