using System.Collections;
using UnityEngine;

namespace BaseGames.Enemies.Boss
{
    /// <summary>
    /// 嘲风漂浮控制器：负责 Phase 2 进入时上浮、击落时下落的平滑位移。
    /// 使用 Rigidbody2D.MovePosition 做帧级 Lerp 插值，避免物理穿墙。
    /// </summary>
    public class ChaoFengFloatController : MonoBehaviour
    {
        [SerializeField] private float         _floatHeight  = 5f;
        [SerializeField] private float         _riseDuration = 1.5f;
        [SerializeField] private float         _fallDuration = 0.8f;
        [SerializeField] private Rigidbody2D   _rb;

        private float _groundY;

        private void Start() => _groundY = transform.position.y;

        /// <summary>上浮至悬空高度（切换为 Kinematic 后执行）。</summary>
        public IEnumerator FloatUp()
        {
            _rb.bodyType = RigidbodyType2D.Kinematic;
            _rb.velocity = Vector2.zero;
            yield return TweenY(transform.position.y, _groundY + _floatHeight, _riseDuration);
        }

        /// <summary>下落回地面（落地后恢复 Dynamic）。</summary>
        public IEnumerator FallDown()
        {
            yield return TweenY(transform.position.y, _groundY, _fallDuration);
            _rb.bodyType = RigidbodyType2D.Dynamic;
        }

        private IEnumerator TweenY(float from, float to, float duration)
        {
            for (float t = 0f; t < duration; t += Time.deltaTime)
            {
                _rb.MovePosition(new Vector2(transform.position.x, Mathf.Lerp(from, to, t / duration)));
                yield return null;
            }
            _rb.MovePosition(new Vector2(transform.position.x, to));
        }
    }
}