using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// 버튼 클릭 시 눌리는 애니메이션(스케일 펀치)을 재생합니다.
/// </summary>
public static class ButtonAnimator
{
    /// <summary>버튼을 눌렀다 돌아오는 스케일 펀치 후 콜백 실행</summary>
    public static void Play(Button button, Action onComplete = null,
                            float punchScale = 0.85f, float duration = 0.12f)
    {
        if (button == null) { onComplete?.Invoke(); return; }
        button.StartCoroutine(PunchRoutine(button.transform, punchScale, duration, onComplete));
    }

    private static IEnumerator PunchRoutine(Transform t, float punchScale,
                                             float halfDuration, Action onComplete)
    {
        Vector3 original = t.localScale;
        Vector3 small    = original * punchScale;

        // 축소
        float elapsed = 0f;
        while (elapsed < halfDuration)
        {
            elapsed += Time.unscaledDeltaTime;
            t.localScale = Vector3.Lerp(original, small, elapsed / halfDuration);
            yield return null;
        }
        t.localScale = small;

        // 복원
        elapsed = 0f;
        while (elapsed < halfDuration)
        {
            elapsed += Time.unscaledDeltaTime;
            t.localScale = Vector3.Lerp(small, original, elapsed / halfDuration);
            yield return null;
        }
        t.localScale = original;

        onComplete?.Invoke();
    }
}