using BaseGames.Player;
using UnityEngine;

namespace BaseGames.World
{
    /// <summary>
    /// 危险区域。玩家进入时触发即死（调用 Kill()，无视无敌帧）或持续伤害。
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class HazardZone : MonoBehaviour
    {
        [SerializeField] private bool  _isInstantKill  = true;
        [SerializeField] private int   _damage         = 1;
        [Tooltip("持续伤害模式下每次造成伤害的间隔（秒）。仅 _isInstantKill = false 时生效。")]
        [SerializeField] private float _damageInterval = 0.5f;

        private PlayerStats _cachedStats;
        private float       _damageTimer;
        private bool        _playerInside;

        private void OnTriggerEnter2D(Collider2D other)
        {
            if (!other.CompareTag("Player")) return;
            _cachedStats  = other.GetComponentInParent<PlayerStats>();
            if (_cachedStats == null) return;

            _playerInside = true;
            ApplyDamage();
            _damageTimer  = _damageInterval;
        }

        private void OnTriggerExit2D(Collider2D other)
        {
            if (!other.CompareTag("Player")) return;
            _playerInside = false;
            _cachedStats  = null;
        }

        private void Update()
        {
            if (!_playerInside || _isInstantKill || _cachedStats == null) return;

            _damageTimer -= Time.deltaTime;
            if (_damageTimer <= 0f)
            {
                ApplyDamage();
                _damageTimer = _damageInterval;
            }
        }

        private void ApplyDamage()
        {
            if (_cachedStats == null) return;
            if (_isInstantKill)
                _cachedStats.Kill();
            else
                _cachedStats.TakeDamage(_damage);
        }

        private void OnDrawGizmos()
        {
            var col = GetComponent<Collider2D>();
            if (col == null) return;
            Gizmos.color = new Color(1f, 0f, 0f, 0.3f);
            Gizmos.DrawCube(transform.position, col.bounds.size);
            Gizmos.color = new Color(1f, 0f, 0f, 0.8f);
            Gizmos.DrawWireCube(transform.position, col.bounds.size);
        }
    }
}