using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections;
using TMPro;

// ==========================================
// ✨ [중요] 이 위치에 있어야 에러가 나지 않습니다.
// ==========================================
[System.Serializable]
public struct TipLayoutSettings
{
    public string label;

    [Header("TipBar (배경 막대) 설정")]
    public Vector3 barPosition;
    public float barWidth;
    public float barHeight;

    [Header("TipText (텍스트 영역) 설정")]
    public Vector3 textPosition;
    public float textWidth;
    public float textHeight;
}

public class SceneLoader : MonoBehaviour
{
    public static SceneLoader Instance;

    [Header("로딩 UI 연결 (자식 오브젝트 권장)")]
    public GameObject loadingCanvas;
    public CanvasGroup mainGroup;

    [Header("로딩 시 나타날 요소들")]
    public TextMeshProUGUI tipText;
    public GameObject loadingTextObject;
    public GameObject tipBarObject;
    public RectTransform tipBarBackgroundRect;

    [Header("설정")]
    public string[] tips;
    public float fadeDuration = 0.8f;

    [Header("줄 수에 따른 수동 레이아웃")]
    public TipLayoutSettings[] manualLayouts; // 이제 여기서 에러가 나지 않습니다.

    private RectTransform _tipBarRect;
    private RectTransform _tipTextRect;
    private bool _isFading = false;

    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
            return;
        }

        if (loadingCanvas != null) loadingCanvas.SetActive(false);
        if (tipText != null) _tipTextRect = tipText.GetComponent<RectTransform>();
        _tipBarRect = tipBarBackgroundRect != null ? tipBarBackgroundRect : tipBarObject?.GetComponent<RectTransform>();

        if (mainGroup != null) mainGroup.alpha = 0f;
    }

    private void OnEnable() { SceneManager.sceneLoaded += OnSceneLoaded; }
    private void OnDisable() { SceneManager.sceneLoaded -= OnSceneLoaded; }

    private void OnSceneLoaded(Scene scene, LoadSceneMode mode)
    {
        if (loadingCanvas != null && loadingCanvas.activeSelf)
        {
            StopAllCoroutines();
            StartCoroutine(FadeOutAfterLoad());
        }
    }

    public void LoadSceneWithFade(string sceneName)
    {
        if (_isFading) return;
        StartCoroutine(LoadProcess(sceneName));
    }

    private IEnumerator LoadProcess(string sceneName)
    {
        _isFading = true;
        SetupTipText();
        yield return null;
        ApplyManualLayout();

        if (loadingCanvas != null) loadingCanvas.SetActive(true);
        yield return StartCoroutine(Fade(1f, mainGroup));

        AsyncOperation op = SceneManager.LoadSceneAsync(sceneName);
        op.allowSceneActivation = false;

        float timer = 0f;
        while (timer < 2.0f || op.progress < 0.9f)
        {
            timer += Time.deltaTime;
            yield return null;
        }

        op.allowSceneActivation = true;
    }

    private IEnumerator FadeOutAfterLoad()
    {
        yield return StartCoroutine(Fade(0f, mainGroup));
        if (loadingCanvas != null) loadingCanvas.SetActive(false);
        _isFading = false;
    }

    private void SetupTipText()
    {
        if (tipText == null) return;
        if (tips != null && tips.Length > 0)
            tipText.text = $"<color=#FFD700>Tip!</color> : {tips[Random.Range(0, tips.Length)]}";
        else
            tipText.text = "";
    }

    private void ApplyManualLayout()
    {
        if (tipText == null || _tipBarRect == null || _tipTextRect == null) return;
        if (string.IsNullOrWhiteSpace(tipText.text))
        {
            if (tipBarObject != null) tipBarObject.SetActive(false);
            return;
        }

        if (tipBarObject != null) tipBarObject.SetActive(true);
        tipText.ForceMeshUpdate(true);
        int lineCount = tipText.textInfo.lineCount;
        int layoutIndex = Mathf.Clamp(lineCount - 1, 0, manualLayouts.Length - 1);

        if (manualLayouts.Length > 0)
        {
            TipLayoutSettings settings = manualLayouts[layoutIndex];
            _tipBarRect.anchoredPosition = settings.barPosition;
            _tipBarRect.sizeDelta = new Vector2(settings.barWidth, settings.barHeight);
            _tipTextRect.anchoredPosition = settings.textPosition;
            _tipTextRect.sizeDelta = new Vector2(settings.textWidth, settings.textHeight);
        }
    }

    private IEnumerator Fade(float targetAlpha, CanvasGroup canvasGroup)
    {
        if (canvasGroup == null) yield break;
        float speed = 1f / Mathf.Max(0.01f, fadeDuration);

        while (canvasGroup != null && !Mathf.Approximately(canvasGroup.alpha, targetAlpha))
        {
            canvasGroup.alpha = Mathf.MoveTowards(canvasGroup.alpha, targetAlpha, speed * Time.unscaledDeltaTime);
            yield return null;
        }
        if (canvasGroup != null) canvasGroup.alpha = targetAlpha;
    }
}