using SepCore.Definition;

namespace SepCore.Entity
{
    /// <summary>
    /// 闪电的瞄准状态。
    /// </summary>
    public sealed class WeaponLightningAimState : WeaponStateBase
    {
        private WeaponLightning _weapon;

        public override WeaponStateType State => WeaponStateType.Aim;

        public override void OnInit(WeaponBase weapon) => _weapon = (WeaponLightning)weapon;

        public override void OnEnter()
        {
            if (_weapon.CanAttack)
            {
                _weapon.TransitionTo(WeaponStateType.Attack);
            }
        }

        public override void OnUpdate(float elapseSeconds, float realElapseSeconds)
        {
            _weapon.Check();
            _weapon.RotateToTarget(elapseSeconds);

            if (_weapon.Target == null || !_weapon.Target.Available)
            {
                _weapon.TransitionTo(WeaponStateType.Idle);
                return;
            }

            if (!_weapon.IsInRange(_weapon.Target, _weapon.SqrRange))
            {
                _weapon.TransitionTo(WeaponStateType.Seek);
                return;
            }

            if (_weapon.CanAttack)
            {
                _weapon.TransitionTo(WeaponStateType.Attack);
            }
        }

        public override void OnLeave()
        {
        }
    }
}