using UnityEngine;
using BaseGames.Combat;

namespace BaseGames.Player.States
{
    /// <summary>
    /// 下劈（踩踏 Pogo）状态（架构 05_PlayerModule §2）。
    /// 需解锁 AbilityType.DownSlash 才能进入；
    /// 激活 HitBoxDown，着地或命中后弹跳。
    /// </summary>
    public class DownAttackState : PlayerStateBase
    {
        private bool _hasHitEnemy;
        private bool _exited;

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

        public override void OnStateEnter()
        {
            _hasHitEnemy = false;
            _exited      = false;

            if (Owner.Combat != null)
                Owner.Combat.OnDownHitConfirmed += OnDownHitConfirmed;

            var step = Owner.Weapon?.ActiveWeapon?.GetDirStep(AttackDirection.Down);
            float spd = Stats?.AnimatorSpeedMultiplier ?? 1f;

            if (step?.clip?.Clip != null)
            {
                var animState = Anim.Play(step.Value.clip);
                animState.Speed *= spd;
                var events = animState.Events(this);
                events.OnEnd = OnClipEnd;
                var s = step.Value;
                events.Add(s.hitBoxEnter, () => Owner.Combat?.EnableWeaponHitBox(AttackDirection.Down, s.hitBoxId));
                events.Add(step.Value.hitBoxExit,  () => Owner.Combat?.DisableAllWeaponHitBoxes());
            }
            else
            {
                Owner.Combat?.EnableWeaponHitBox(AttackDirection.Down);
                OnClipEnd();
            }

            // 下劈为纯向下攻击：保持角色原有的自然下落，不额外施加向下俯冲位移
            // （俯冲位移会让下劈手感变成下冲，命中弹跳逻辑见 OnDownHitConfirmed）
        }

        public override void OnStateExit()
        {
            _exited = true;
            if (Owner.Combat != null)
                Owner.Combat.OnDownHitConfirmed -= OnDownHitConfirmed;
            Owner.Combat?.DisableAllWeaponHitBoxes();
        }

        private void OnDownHitConfirmed(BaseGames.Combat.DamageInfo _)
        {
            if (_hasHitEnemy) return;
            _hasHitEnemy = true;
            // Pogo 弹跳：命中后向上弹起（独立弹跳力，略矮于满跳），同时重置空中能力（等同落地效果）
            Owner.ResetAirJumps();
            Owner.GetState<DashState>()?.ResetDashCharge();
            Move.PogoBounce();
        }

        public override void OnStateUpdate()
        {
            // 着地时回到 Idle / Run
            if (Move.IsGrounded)
            {
                Owner.TransitionTo(Owner.GetState<IdleState>());
            }
        }

        public override void OnStateFixedUpdate()
        {
            // 下劈期间保留完整空中水平操控（与 FallState 同款贴墙保护，防止压墙摩擦/卡角）
            if (Mathf.Abs(Input.MoveInput.x) > 0.01f)
            {
                int inputDir = Input.MoveInput.x > 0 ? 1 : -1;
                var wd = Owner.WallDetector;
                bool currentFrameWall = inputDir > 0 ? Move.IsWallRight : Move.IsWallLeft;
                if (currentFrameWall
                    || (wd != null && (wd.IsTouchingWall && wd.WallDirection == inputDir
                                       || wd.HasPartialContact(inputDir))))
                    Move.ZeroHorizontalVelocity();
                else
                    Move.Move(Input.MoveInput.x * Cfg.RunSpeed);
            }
            else
                Move.ZeroHorizontalVelocity();
        }

        private void OnClipEnd()
        {
            if (_exited) return;
            if (!Move.IsGrounded)
                Owner.TransitionTo(Owner.GetState<FallState>());
            else
                Owner.TransitionTo(Owner.GetState<IdleState>());
        }
    }
}