using UnityEngine;

namespace BaseGames.Player.States
{
    /// <summary>下落状态。着地后转为 Idle 或 Run，持有郊狼时间允许跳跃。</summary>
    public class FallState : PlayerStateBase
    {
        public FallState(PlayerController owner) : base(owner) { }

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

        public override void OnStateUpdate()
        {
            // 郊狼时间跳跃
            if (Buffer.ConsumeJump() && Move.HasCoyoteTime)
            {
                _owner.TransitionTo(_owner.GetState<JumpState>());
                return;
            }

            // 着地
            if (Move.IsGrounded)
            {
                Move.ZeroVelocity();
                if (Mathf.Abs(Input.MoveInput.x) > 0.1f)
                    _owner.TransitionTo(_owner.GetState<RunState>());
                else
                    _owner.TransitionTo(_owner.GetState<IdleState>());
                return;
            }

            // 空中水平移动
            if (Mathf.Abs(Input.MoveInput.x) > 0.01f)
                Move.Move(Input.MoveInput.x * Cfg.RunSpeed);
        }

        public override void OnStateFixedUpdate()
        {
            // 增强下落重力
            if (Move.Rb.velocity.y < 0f)
            {
                float extraGrav = Physics2D.gravity.y * (Cfg.FallGravityMult - 1f) * Time.fixedDeltaTime;
                Move.Rb.velocity = new Vector2(
                    Move.Rb.velocity.x,
                    Mathf.Max(Move.Rb.velocity.y + extraGrav, -Cfg.MaxFallSpeed));
            }
        }
    }
}