using UnityEngine;

namespace BaseGames.Combat
{
    /// <summary>
    /// 追踪抛射物。初始以 Direction 发射后，每帧向目标转向，
    /// 转向力由 <see cref="ProjectileConfigSO.HomingStrength"/> 控制。
    /// </summary>
    public class HomingProjectile : Projectile
    {
        private Transform _target;

        /// <summary>注入追踪目标（由 ProjectileManager 在生成时调用）。</summary>
        public void SetTarget(Transform t) => _target = t;

        protected override void OnInitialized()
        {
            _rb.velocity = Direction * _config.Speed;
        }

        protected override void Update()
        {
            base.Update();
            if (_target == null || _config == null) return;

            Vector2 toTarget = ((Vector2)_target.position - _rb.position).normalized;
            _rb.velocity += toTarget * (_config.HomingStrength * Time.deltaTime);

            float maxSpeed = _config.Speed * 1.5f;
            if (_rb.velocity.sqrMagnitude > maxSpeed * maxSpeed)
                _rb.velocity = _rb.velocity.normalized * maxSpeed;
        }

        protected override void OnDisable()
        {
            base.OnDisable();
            _target = null;
        }
    }
}