using System.Collections;
using UnityEngine;
using BaseGames.Feedback;

namespace BaseGames.World
{
    /// <summary>
    /// 碎裂平台。玩家踩上后经历 Warning → Crumbling → Gone → (Recovering) 四态。
    /// _isOneShot = true 时碎裂后永久消失；_respawnDelay &gt; 0 则在延迟后恢复。
    /// </summary>
    [RequireComponent(typeof(BoxCollider2D))]
    public class CrumblePlatform : MonoBehaviour
    {
        [SerializeField] private float      _warningDuration  = 0.6f;
        [SerializeField] private float      _crumbleDuration  = 0.3f;
        [SerializeField] private float      _respawnDelay     = 3.0f;   // 0 = 永久消失
        [SerializeField] private bool       _isOneShot        = false;
        [SerializeField] private SceneFeedback _crumbleFeedback;        // 预警震动 + 碎裂粒子 + 音效
        [SerializeField] private BoxCollider2D _passengerSensor;        // IsTrigger，检测玩家踩踏

        [Header("持久化（_isOneShot = true 时生效）")]
        [Tooltip("平台唯一 ID。_isOneShot=true 时碎裂状态写入 WorldStateRegistry，重载场景后不复原。留空则不持久化。")]
        [SerializeField] private string             _platformId;
        [SerializeField] private WorldStateRegistry _worldState;

        private BoxCollider2D  _col;
        private SpriteRenderer _sr;
        private bool           _isCrumbling;

        private void Awake()
        {
            _col = GetComponent<BoxCollider2D>();
            _sr  = GetComponent<SpriteRenderer>();
        }

        private void Start()
        {
            // 读档恢复：_isOneShot 平台已碎裂则直接禁用，无需等待触发
            if (!_isOneShot || string.IsNullOrEmpty(_platformId) || _worldState == null) return;
            if (!_worldState.HasFlag("crumble_" + _platformId)) return;

            _isCrumbling    = true;
            _col.enabled    = false;
            _sr.enabled     = false;
            if (_passengerSensor != null) _passengerSensor.enabled = false;
        }

        private void OnTriggerEnter2D(Collider2D other)
        {
            if (_isCrumbling) return;
            if (!other.CompareTag("Player")) return;
            StartCoroutine(CrumbleSequence());
        }

        private IEnumerator CrumbleSequence()
        {
            _isCrumbling = true;

            // 1. Warning（抖动）
            _crumbleFeedback?.Play();
            yield return new WaitForSeconds(_warningDuration);

            // 2. Crumbling 动画等待
            yield return new WaitForSeconds(_crumbleDuration);

            // 3. Gone：禁用碰撞体 + 隐藏 Sprite
            _col.enabled = false;
            _sr.enabled  = false;
            if (_passengerSensor != null)
                _passengerSensor.enabled = false;

            if (_isOneShot || _respawnDelay <= 0f)
            {
                // 持久化一次性碎裂状态，场景重载后不复原
                if (_isOneShot && !string.IsNullOrEmpty(_platformId))
                    _worldState?.SetFlag("crumble_" + _platformId);
                yield break;
            }

            // 4. Respawn
            yield return new WaitForSeconds(_respawnDelay);

            _col.enabled = true;
            _sr.enabled  = true;
            if (_passengerSensor != null)
                _passengerSensor.enabled = true;

            _isCrumbling = false;
        }
    }
}