using UnityEngine;
using WI;
using UnityEngine.UI;
using System.Collections;
using TMPro;
using System;

namespace Samkwang
{
    public class Panel_Loading : MonoBehaviour
    {
        public CanvasGroup logoRoot;
        public Image arcImage;

        public GameObject loadingBarRoot;
        public Slider slider_LoadingProgress;
        public TMP_Text Text_Loading;
        
        public float fadeOutDuration = 0.8f;
        public float simulationDuration = 4f;

        private static bool hasPlayedOnce = false;
        Coroutine loadingCoroutine;

        public Action onLoadingComplete;

        void Awake()
        {
            logoRoot = transform.GetComponentInChildren<CanvasGroup>();
            arcImage = logoRoot.GetComponentInChildren<Image>();

            loadingBarRoot = transform.Find("LoadingBar").gameObject;
            slider_LoadingProgress = loadingBarRoot.GetComponentInChildren<Slider>();
            Text_Loading = loadingBarRoot.GetComponentInChildren<TextMeshProUGUI>();
            
            transform.SetAsLastSibling();
            logoRoot.alpha = 1f;
            arcImage.fillAmount = 0f;
        }

        void Start()
        {
            if (hasPlayedOnce)
            {
                gameObject.SetActive(false);
                return;
            }
            hasPlayedOnce = true;

            StartLoadingRoutine();
        }

        public void StartLoadingRoutine()
        {
            if (loadingCoroutine != null) StopCoroutine(loadingCoroutine);
            loadingCoroutine = StartCoroutine(RunLoadingRoutine());
        }

        IEnumerator RunLoadingRoutine()
        {
            yield return new WaitForSeconds(0.3f);

            float elapsed = 0f;
            while (elapsed < simulationDuration)
            {
                elapsed += Time.deltaTime;
                float progress = Mathf.Clamp01(elapsed / simulationDuration);

                UpdateProgress(progress);
                RotateArc();

                yield return null;
            }
            UpdateProgress(1f);

            arcImage.fillAmount = 1f;
            loadingBarRoot.SetActive(false);

            yield return new WaitForSeconds(0.2f);
            yield return StartCoroutine(FadeOutAndDisable());
        }

        void UpdateProgress(float progress01)
        {
            slider_LoadingProgress.value = progress01;
            Text_Loading.SetText($"Loading..({(progress01 * 100f).ToString("F0")}%)");
        }

        void RotateArc()
        {
            arcImage.fillAmount = arcImage.fillAmount < 1 ? arcImage.fillAmount += Time.deltaTime * 0.5f : 0;
        }

        IEnumerator FadeOutAndDisable()
        {
            float t = 0f;
            float start = logoRoot.alpha;
            while (t < fadeOutDuration)
            {
                t += Time.deltaTime;
                logoRoot.alpha = Mathf.Lerp(start, 0f, t / fadeOutDuration);
                yield return null;
            }
            logoRoot.alpha = 0f;
            gameObject.SetActive(false);
            onLoadingComplete?.Invoke();
        }
    }
}