using Cielonos.MainGame.Characters;
using UnityEngine;
using SLSUtilities.General;

namespace Cielonos.MainGame
{
    public partial class AttackAreaBase
    {
        public class TractionSubmodule : AttackAreaSubmoduleBase
        {
            public float pullSpeed;
            public float deadZone;

            public TractionSubmodule(AttackAreaBase owner, float pullSpeed, float deadZone) : base(owner)
            {
                this.pullSpeed = pullSpeed;
                this.deadZone = deadZone;
            }

            public void ApplyTraction(CharacterBase target)
            {
                float deltaTime = attackArea.DeltaTime;
                if (deltaTime == 0) return;

                Vector3 center = attackArea.topParent.position;
                Vector3 targetPos = target.CenterPoint.position;
                Vector3 direction = (center - targetPos).Flatten();
                float distance = direction.magnitude;

                if (distance > 0.01f)
                {
                    float force = pullSpeed;

                    // 死区阻尼，防止经过中心时鬼畜
                    if (distance < deadZone)
                    {
                        force = Mathf.Lerp(0, pullSpeed, distance / deadZone);
                    }

                    // 考虑角色的抗打断（ImpactResistance）
                    float resistance = target.attributeSm[CharacterAttribute.ImpactResistance];
                    float multiplier = Mathf.Clamp01(1f - (resistance / 100f));
                    force *= multiplier * multiplier; // 二次方，抗性越高，拉力衰减越快

                    Vector3 velocity = direction.normalized * force * deltaTime;
                    target.movementSc.externalForceVelocity += velocity;
                }
            }
        }
    }
}