OCTOPUS_TWIN-Demo/Assets/Scripts/UI/UILoading.cs

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

namespace OCTOPUS_TWIN
{
    public class UILoading : MonoBehaviour
    {
        private static UILoading instance;

        private const string PREFAB_PATH = "UI/Prefabs/Home/UILoading";
        private float loadingDuration = 1.5f;
        private float fadeSpeed = 2.0f;

        private CanvasGroup logoCanvasGroup; // 로고의 CanvasGroup 연결
        private Image progressBar;
        private TextMeshProUGUI percentageText;

        public static UILoading Instance
        {
            get
            {
                if (instance == null)
                {
                    var obj = FindAnyObjectByType<UILoading>();

                    if (obj != null)
                        instance = obj;
                    else
                        instance = Create();
                }
                return instance;
            }
        }

        private static UILoading Create()
        {
            return Instantiate(Resources.Load<UILoading>(PREFAB_PATH));
        }

        private void Awake()
        {
            if (Instance != this)
            {
                Destroy(gameObject);

                return;
            }
            DontDestroyOnLoad(gameObject);

            logoCanvasGroup = GetComponentInChildren<CanvasGroup>();

            if (progressBar == null)
            {
                var imageTransform = transform.Find("Background/LoadingBarImage");
                if (imageTransform != null)
                {
                    progressBar = imageTransform.GetComponentInChildren<Image>();
                }
                else
                {
                    // 경로로 못 찾으면 자식 전체에서 탐색
                    progressBar = GetComponentInChildren<Image>();
                }
            }

            if (percentageText == null)
            {
                var textTransform = transform.Find("Background/PercentageText");
                if (textTransform != null)
                {
                    percentageText = textTransform.GetComponent<TextMeshProUGUI>();
                }
                else
                {
                    // 경로로 못 찾으면 자식 전체에서 탐색
                    percentageText = GetComponentInChildren<TextMeshProUGUI>();
                }
            }
        }

        public async UniTaskVoid LoadProject(Action onFadeInComplete)
        {
            StopAllCoroutines();

            gameObject.SetActive(true);
            StartCoroutine(LoadProjectProgress(onFadeInComplete));
        }

        private IEnumerator LoadProjectProgress(Action onFadeInComplete)
        {
            logoCanvasGroup.alpha = 1.0f;
            progressBar.fillAmount = 0.0f;

            if (percentageText != null) percentageText.text = "0%";

            onFadeInComplete?.Invoke();

            float timer = 0.0f;

            while (timer < loadingDuration)
            {
                yield return null;
                timer += Time.unscaledDeltaTime;

                // 0에서 1까지 3초 동안 부드럽게 채움
                float currentFill = Mathf.Lerp(0.0f, 1.0f, timer / loadingDuration);
                progressBar.fillAmount = currentFill;

                if (percentageText != null)
                {
                    // 0.0 ~ 1.0 값을 0 ~ 100 정수로 변환
                    int percent = Mathf.RoundToInt(currentFill * 100);
                    percentageText.text = $"{percent}%";
                }
            }

            progressBar.fillAmount = 1.0f;
            if (percentageText != null) 
                percentageText.text = "100%";

            yield return StartCoroutine(Fade(false));
        }

        private IEnumerator Fade(bool isFadeIn)
        {
            float timer = 0.0f;

            while (timer <= 1.0f)
            {
                yield return null;
                timer += Time.unscaledDeltaTime * fadeSpeed;

                logoCanvasGroup.alpha = isFadeIn ? Mathf.Lerp(0.0f, 1.0f, timer) : Mathf.Lerp(1.0f, 0.0f, timer);
            }

            // 페이드 아웃이 끝나면 비활성화
            if (!isFadeIn)
            {
                gameObject.SetActive(false);
            }
        }
    }
}