using BaseGames.Combat;

namespace BaseGames.Player.States
{
    /// <summary>
    /// 地面攻击状态（3 段连击）。
    /// 由 PlayerController 实例化，AttackEvent 触发切换。
    /// 通过 Animancer 帧事件驱动 HitBox 激活/关闭。
    /// </summary>
    public class AttackState : PlayerStateBase
    {
        private int _comboIndex;

        public AttackState(PlayerController owner) : base(owner) { }

        public override void OnStateEnter()
        {
            _comboIndex = 0;
            PlayAttackClip();
            Input.AttackEvent += OnAttackInput;
        }

        public override void OnStateExit()
        {
            Input.AttackEvent -= OnAttackInput;
            Owner.Combat?.DisableAllWeaponHitBoxes();
        }

        public override void OnStateUpdate() { }
        public override void OnStateFixedUpdate() { }

        // ── 内部 ──────────────────────────────────────────────────────────────

        private void PlayAttackClip()
        {
            // ⚠️ 字段名 GroundAttacks（非 AttackChainClips）
            var clip   = AnimCfg.GroundAttacks[_comboIndex];
            var state  = Anim.Play(clip);
            var events = state.Events(this);
            events.OnEnd = OnClipEnd;

            // HitBox 由 Animancer 归一化时间事件驱动（时间点配置于 PlayerAnimationConfigSO）
            var timings = AnimCfg?.GroundAttackTimings;
            float enterTime = timings != null && _comboIndex < timings.Length
                ? timings[_comboIndex].HitBoxEnter : 0.3f;
            float exitTime  = timings != null && _comboIndex < timings.Length
                ? timings[_comboIndex].HitBoxExit  : 0.6f;
            events.Add(enterTime, () => Owner.Combat?.EnableWeaponHitBox(AttackDirection.Ground));
            events.Add(exitTime,  () => Owner.Combat?.DisableAllWeaponHitBoxes());
        }

        private void OnClipEnd()
        {
            Owner.Combat?.DisableAllWeaponHitBoxes();
            Owner.TransitionTo(Owner.GetState<IdleState>());
        }

        private void OnAttackInput()
        {
            // 连击段数从配置 SO 动态读取，无须修改代码即可支持任意段数连击
            int maxCombo = AnimCfg?.GroundAttacks?.Length ?? 1;
            if (_comboIndex < maxCombo - 1)
            {
                _comboIndex++;
                PlayAttackClip();
            }
        }
    }
}