using System;
using System.Collections;
using UnityEngine;

/// <summary>
/// 抛物线飞行投射物（支持终点落地下落特效）
/// </summary>
public class ParabolaFlyObject : MonoBehaviour
{
    private Vector3 startPoint;
    private Vector3 endPoint;
    private float flyDuration;
    private float heightPeak;
    private Action onImpactCallback;
    private GameObject impactEffectPrefab;

    /// <summary>
    /// 初始化抛物线飞行
    /// </summary>
    public void Launch(Vector3 start, Vector3 end, float duration, float height, GameObject impactPrefab = null, Action onImpact = null)
    {
        startPoint = start;
        endPoint = end;
        flyDuration = duration > 0.05f ? duration : 0.8f;
        heightPeak = height;
        impactEffectPrefab = impactPrefab;
        onImpactCallback = onImpact;

        transform.position = start;
        StartCoroutine(FlyRoutine());
    }

    private IEnumerator FlyRoutine()
    {
        float elapsedTime = 0f;

        while (elapsedTime < flyDuration)
        {
            elapsedTime += Time.deltaTime;
            float t = Mathf.Clamp01(elapsedTime / flyDuration);

            // 水平线性插值
            Vector3 currentPos = Vector3.Lerp(startPoint, endPoint, t);
            // 抛物线弧度 y 轴偏移：4 * h * t * (1 - t)
            currentPos.y += 4f * heightPeak * t * (1f - t);

            transform.position = currentPos;
            yield return null;
        }

        transform.position = endPoint;

        // 落地时生成冲击波特效 (明确带入 impactEffectPrefab.transform.rotation，保留 -90° 旋转使网格平铺地面)
        if (impactEffectPrefab != null)
        {
            Quaternion rot = impactEffectPrefab.transform.rotation;
            var effectGo = Instantiate(impactEffectPrefab, endPoint, rot);
            effectGo.transform.rotation = rot; // 显式给实例化后的对象二次确认 rotation
            Destroy(effectGo, 3.5f); // 3.5 秒后清理粒子
        }

        onImpactCallback?.Invoke();
        Destroy(gameObject);
    }
}