using UnityEngine;

namespace BaseGames.Player.States
{
    /// <summary>
    /// 壁滑状态（架构 05_PlayerModule §2）。
    /// 需有 PlayerWallDetector.IsTouchingWall == true 才能进入；
    /// 限制下落速度为 WallSlideSpeed；按跳跃则切换到 WallJumpState。
    /// </summary>
    public class WallSlideState : PlayerStateBase
    {
        public WallSlideState(PlayerController owner) : base(owner) { }

        public override void OnStateEnter()
        {
            if (AnimCfg?.WallSlide != null)
                Anim?.Play(AnimCfg.WallSlide);

            Input.JumpStartedEvent += OnJumpPressed;
        }

        public override void OnStateExit()
        {
            Input.JumpStartedEvent -= OnJumpPressed;
        }

        public override void OnStateUpdate()
        {
            // 离开墙壁 → 下落
            if (Owner.WallDetector == null || !Owner.WallDetector.IsTouchingWall)
            {
                Owner.TransitionTo(Owner.GetState<FallState>());
                return;
            }

            // 着地 → 闲置
            if (Move.IsGrounded)
            {
                Owner.TransitionTo(Owner.GetState<IdleState>());
                return;
            }
        }

        public override void OnStateFixedUpdate()
        {
            // 限制下落速度（壁滑缓慢下落）
            Move?.ApplyWallSlide();
        }

        private void OnJumpPressed()
        {
            Owner.TransitionTo(Owner.GetState<WallJumpState>());
        }
    }
}