using UnityEngine;
using System.Collections;

public class TreeElasticHit : MonoBehaviour
{
    public float hitDuration = 1f;  // 受击反馈持续时间
    public float scaleAmount = 0.05f;  // 缩放量
    public float rotationAngle = 5f; // 旋转角度
    public float damping = 10f;  // 阻尼系数
    public float intervalBetweenHits = 5f;  // 每次受击间隔时间

    private Vector3 originalScale;
    private Quaternion originalRotation;

    void Start()
    {
        originalScale = transform.localScale;
        originalRotation = transform.rotation;

        StartCoroutine(AutoHit());
    }

    IEnumerator AutoHit()
    {
        while (true)
        {
            yield return new WaitForSeconds(intervalBetweenHits); 
            OnHit();

        }
    }

    public void OnHit()
    {
        StopAllCoroutines();
        StartCoroutine(ElasticFeedback());
    }

    IEnumerator ElasticFeedback()
    {
        float timeElapsed = 0f;

        while (timeElapsed < hitDuration)
        {
            timeElapsed += Time.deltaTime;
            float progress = timeElapsed / hitDuration;

            float dampenedSin = Mathf.Sin(progress * Mathf.PI * damping) / (progress * damping + 1);

            float scaleFactor = 1 - (scaleAmount * dampenedSin);
            transform.localScale = new Vector3(originalScale.x * scaleFactor, originalScale.y * scaleFactor, originalScale.z);

            float rotationFactor = rotationAngle * dampenedSin;
            transform.rotation = Quaternion.Euler(0, 0, originalRotation.eulerAngles.z + rotationFactor);

            yield return null;
        }

        transform.localScale = originalScale;
        transform.rotation = originalRotation;

        StartCoroutine(AutoHit());
    }
}