using UnityEngine;
using Animancer;
using BaseGames.Core.Events;
using BaseGames.Input;
using BaseGames.Combat;
using BaseGames.Parry;

namespace BaseGames.Player.States
{
    /// <summary>
    /// 玩家主控制器（协调器）。位于 Player/States/ 程序集，以便引用所有具体状态类型。
    /// 实现 IDamageable：IsInvincible/Defense 委托 PlayerStats，TakeDamage 委托 _stats。
    /// 依赖注入：所有子系统通过 [SerializeField] 字段在 Inspector 中绑定。
    /// </summary>
    [DefaultExecutionOrder(-100)]
    [RequireComponent(typeof(InputBuffer))]
    public class PlayerController : MonoBehaviour, IDamageable
    {
        // ── 移动 & 数值 ───────────────────────────────────────────────────────
        [Header("核心组件")]
        [SerializeField] private PlayerMovement           _movement;
        [SerializeField] private PlayerStats              _stats;
        [SerializeField] private AnimancerComponent       _animancer;

        // ── 配置 SO ───────────────────────────────────────────────────────────
        [Header("配置")]
        [SerializeField] private PlayerMovementConfigSO   _movementConfig;
        [SerializeField] private PlayerAnimationConfigSO  _animConfig;
        [SerializeField] private InputReaderSO             _inputReader;        [SerializeField] private PlayerStatsSO             _statsConfig;   // 数值基准（HP/弹簧等初始化用）
        [SerializeField] private FormConfigSO              _formConfig;    // Phase 2：三形态切换参数
        // ── 战斗组件 ──────────────────────────────────────────────────────────
        [Header("战斗")]
        [SerializeField] private PlayerCombat     _combat;
        [SerializeField] private FormController   _formController;
        [SerializeField] private WeaponManager    _weaponManager;
        [SerializeField] private SkillManager     _skillManager;
        [SerializeField] private SpringSystem     _springSystem;
        [SerializeField] private ParrySystem      _parrySystem;
        [SerializeField] private HurtBox          _hurtBox;
        [SerializeField] private ShieldComponent  _shield;

        // ── 事件频道 ──────────────────────────────────────────────────────────
        [Header("事件频道")]
        [SerializeField] private VoidEventChannelSO _onPlayerDied;
        [SerializeField] private IntEventChannelSO  _onHPChanged;

        // ── 运行时 ────────────────────────────────────────────────────────────
        private InputBuffer _inputBuffer;

        // ── 状态实例 ──────────────────────────────────────────────────────────
        private PlayerStateBase _currentState;

        private IdleState   _idleState;
        private RunState    _runState;
        private JumpState   _jumpState;
        private FallState   _fallState;
        private AttackState _attackState;

        // ── IDamageable 实现 ──────────────────────────────────────────────────
        public bool IsInvincible => _stats != null && _stats.IsInvincible;
        public int  Defense      => 0;  // Phase 2：从 PlayerStatsSO 读取

        public void TakeDamage(DamageInfo info)
        {
            if (_stats == null) return;
            _stats.TakeDamage(info.FinalDamage);
            // Phase 2：若非 DashState，切换 HurtState
        }

        // ── 公开属性（供状态类访问）──────────────────────────────────────────
        public PlayerMovement          Movement   => _movement;
        public PlayerStats             Stats      => _stats;
        public AnimancerComponent      Animancer  => _animancer;
        public PlayerMovementConfigSO  MovConfig  => _movementConfig;
        public PlayerAnimationConfigSO AnimConfig => _animConfig;
        public InputReaderSO           Input      => _inputReader;
        public InputBuffer             Buffer     => _inputBuffer;

        public PlayerCombat   Combat  => _combat;
        public FormController Form    => _formController;
        public WeaponManager  Weapon  => _weaponManager;
        public SkillManager   Skill   => _skillManager;
        public SpringSystem   Spring  => _springSystem;
        public ParrySystem    Parry   => _parrySystem;
        public HurtBox        HurtBox => _hurtBox;
        public ShieldComponent Shield => _shield;

        public bool IsGrounded      => _movement != null && _movement.IsGrounded;
        public int  FacingDirection => _movement != null ? _movement.FacingDirection : 1;

        // ── Unity Lifecycle ───────────────────────────────────────────────────
        private void Awake()
        {
            _inputBuffer = GetComponent<InputBuffer>();

            // 注入 HurtBox 依赖（Phase 1：只注入护盾；弹反/霸体 Phase 2）
            if (_hurtBox != null && _shield != null)
                _hurtBox.SetShieldable(_shield);

            InitializeStates();
        }

        private void Start()
        {
            TransitionTo(_idleState);
        }

        private void Update()
        {
            _currentState?.OnStateUpdate();
        }

        private void FixedUpdate()
        {
            _currentState?.OnStateFixedUpdate();
        }

        private void LateUpdate()
        {
            _movement?.UpdateFacing();
        }

        // ── 状态机 ────────────────────────────────────────────────────────────
        public void TransitionTo(PlayerStateBase newState)
        {
            _currentState?.OnStateExit();
            _currentState = newState;
            _currentState?.OnStateEnter();
        }

        /// <summary>尝试切换状态（供状态内部的条件转换使用）。</summary>
        public void TryTransitionState(PlayerStateBase newState)
            => TransitionTo(newState);

        private void InitializeStates()
        {
            _idleState   = new IdleState(this);
            _runState    = new RunState(this);
            _jumpState   = new JumpState(this);
            _fallState   = new FallState(this);
            _attackState = new AttackState(this);
        }

        // ── 状态访问器 ────────────────────────────────────────────────────────
        public IdleState   IdleState   => _idleState;
        public RunState    RunState    => _runState;
        public JumpState   JumpState   => _jumpState;
        public FallState   FallState   => _fallState;
        public AttackState AttackState => _attackState;
    }
}