using System.Collections;
using UnityEngine;

public class MenuIntroController : MonoBehaviour
{
    [System.Serializable]
    public class MenuItem
    {
        public RectTransform rect;
        public CanvasGroup canvasGroup;
        public float delay;
        [HideInInspector] public Vector2 targetPosition;
    }

    public MenuItem[] menuItems;

    public float moveDistance = 80f;
    public float introDuration = 0.6f;  // 나타날 때 속도
    public float outroDuration = 0.3f;  // 사라질 때 속도
    public AnimationCurve ease = AnimationCurve.EaseInOut(0, 0, 1, 1);

    private void Awake()
    {
        foreach (MenuItem item in menuItems)
        {
            item.targetPosition = item.rect.anchoredPosition;
            item.rect.anchoredPosition = item.targetPosition + new Vector2(moveDistance, 0f);
            item.canvasGroup.alpha = 0f;
            item.canvasGroup.interactable = false;
            item.canvasGroup.blocksRaycasts = false;
        }
    }

    private void Start()
    {
        StartCoroutine(PlayIntro());
    }

    // ── 인트로 (슬라이드 인) ───────────────────
    private IEnumerator PlayIntro()
    {
        foreach (MenuItem item in menuItems)
            StartCoroutine(AnimateItemIn(item));

        yield return null;
    }

    private IEnumerator AnimateItemIn(MenuItem item)
    {
        yield return new WaitForSeconds(item.delay);

        float time = 0f;
        Vector2 startPos = item.targetPosition + new Vector2(moveDistance, 0f);

        while (time < introDuration)
        {
            time += Time.deltaTime;
            float curved = ease.Evaluate(Mathf.Clamp01(time / introDuration));

            item.rect.anchoredPosition = Vector2.Lerp(startPos, item.targetPosition, curved);
            item.canvasGroup.alpha = Mathf.Lerp(0f, 1f, curved);
            yield return null;
        }

        item.rect.anchoredPosition = item.targetPosition;
        item.canvasGroup.alpha = 1f;
        item.canvasGroup.interactable = true;
        item.canvasGroup.blocksRaycasts = true;
    }

    // ── 아웃트로 (슬라이드 아웃) ───────────────
    public IEnumerator PlayOutro()
    {
        foreach (MenuItem item in menuItems)
            StartCoroutine(AnimateItemOut(item));

        float maxWait = 0f;
        foreach (MenuItem item in menuItems)
            maxWait = Mathf.Max(maxWait, item.delay);

        yield return new WaitForSeconds(maxWait + outroDuration);
    }

    private IEnumerator AnimateItemOut(MenuItem item)
    {
        yield return new WaitForSeconds(item.delay);

        float time = 0f;
        Vector2 startPos = item.rect.anchoredPosition;
        Vector2 exitPos = item.targetPosition + new Vector2(moveDistance, 0f);

        while (time < outroDuration)
        {
            time += Time.deltaTime;
            float curved = ease.Evaluate(Mathf.Clamp01(time / outroDuration));

            item.rect.anchoredPosition = Vector2.Lerp(startPos, exitPos, curved);
            item.canvasGroup.alpha = Mathf.Lerp(1f, 0f, curved);
            yield return null;
        }

        item.rect.anchoredPosition = exitPos;
        item.canvasGroup.alpha = 0f;
        item.canvasGroup.interactable = false;
        item.canvasGroup.blocksRaycasts = false;
    }

    // ── 외부에서 재실행 ────────────────────────
    public void ReplayIntro()
    {
        StopAllCoroutines();

        foreach (MenuItem item in menuItems)
        {
            item.rect.anchoredPosition = item.targetPosition + new Vector2(moveDistance, 0f);
            item.canvasGroup.alpha = 0f;
            item.canvasGroup.interactable = false;
            item.canvasGroup.blocksRaycasts = false;
        }

        StartCoroutine(PlayIntro());
    }
}