using UnityEngine;
using BaseGames.Combat;

namespace BaseGames.Enemies
{
    /// <summary>
    /// 飞行敌人。不依赖 PathBerserker2d 导航，直接通过 Rigidbody2D 向玩家移动。
    /// 接触玩家时造成伤害。
    /// </summary>
    public class FlyingEnemy : EnemyBase
    {
        [SerializeField] private float          _chaseSpeed  = 3f;
        [SerializeField] private DamageSourceSO _contactDamageSource;

        private Rigidbody2D _rb;

        protected override void Awake()
        {
            base.Awake();
            _rb = GetComponent<Rigidbody2D>();
            if (_rb != null)
            {
                _rb.gravityScale  = 0f;
                _rb.constraints   = RigidbodyConstraints2D.FreezeRotation;
            }
        }

        protected override void Update()
        {
            base.Update();

            if (_playerTransform == null || _rb == null) return;
            if (CurrentState == EnemyStateType.Dead ||
                CurrentState == EnemyStateType.Stagger) return;

            // 向玩家移动
            Vector2 targetPos = _playerTransform.position;
            Vector2 myPos     = _rb.position;
            Vector2 newPos    = Vector2.MoveTowards(myPos, targetPos, _chaseSpeed * Time.deltaTime);
            _rb.MovePosition(newPos);
        }

        public override void StopMovement()
        {
            if (_rb != null) _rb.velocity = Vector2.zero;
        }

        public override void MoveInDirection(float dir)
        {
            if (_rb != null) _rb.velocity = new Vector2(dir, 0f) * _chaseSpeed;
        }

        private void OnTriggerStay2D(Collider2D other)
        {
            if (_contactDamageSource == null) return;
            if (CurrentState == EnemyStateType.Dead) return;

            var hurtBox = other.GetComponent<HurtBox>();
            if (hurtBox == null) return;

            Vector2 knockDir = ((Vector2)other.bounds.center - _rb.position).normalized;
            var info = DamageInfo.From(
                _contactDamageSource,
                knockDir,
                transform.position,
                gameObject.layer);
            hurtBox.ReceiveDamage(info);
        }
    }
}