using UnityEngine;
using Animancer;
using System.Collections.Generic;
using BaseGames.Player;
using BaseGames.Input;
using BaseGames.Combat;
using BaseGames.Feedback;

namespace BaseGames.Skills
{
    /// <summary>
    /// 技能管理器（架构 09_ProgressionModule §9）。
    /// 挂在 Player 上，订阅输入事件并处理所有技能施放逻辑。
    /// 通过 UpdateSkillSet() 由 FormController 注入当前形态技能。
    /// 直接使用 AnimancerComponent 播放动画，无需 SoulSkillState FSM。
    /// </summary>
    public class SkillManager : MonoBehaviour
    {
        [Header("依赖引用")]
        [SerializeField] private PlayerStats          _stats;
        [SerializeField] private AnimancerComponent   _animancer;
        [SerializeField] private InputReaderSO        _input;
        [SerializeField] private FormController _formController;
        [SerializeField] private SkillModifierRegistry _modifiers;

        [Header("技能挂载点")]
        [SerializeField] private Transform _skillSocket;   // [SkillSocket] 子节点

        [Header("形态技能映射")]
        [SerializeField] private FormSkillSet[] _formSkillSets;   // 按 FormType 配置，与 FormConfigSO.forms[] 对应

        [System.Serializable]
        private struct FormSkillSet
        {
            public FormType formType;
            public FormSkillSO soulSkill;
            public FormSkillSO spiritSkill1;
            public FormSkillSO spiritSkill2;
        }

        // 当前形态技能集（绑定到对应输入槽）
        private FormSkillSO _soulSkill;
        private FormSkillSO _spirit1;
        private FormSkillSO _spirit2;
        private IFeedbackPlayer _feedback;

        // 冷却字典（FormSkillSO → 剩余冷却秒数），UpdateSkillSet 时重建
        private readonly Dictionary<FormSkillSO, float> _cooldowns = new(3);
        // 无分配 Update 遍历用的快照数组
        private FormSkillSO[] _activeSkills = System.Array.Empty<FormSkillSO>();
        // 技能 HitBox 对象池：prefab → 已创建的实例列表，通过 activeSelf 判断是否可复用
        private readonly Dictionary<GameObject, List<SkillHitBoxInstance>> _hitBoxPools = new();

        // ── 生命周期 ──────────────────────────────────────────────────────────
        private void Awake()
        {
            _feedback = GetComponentInChildren<IFeedbackPlayer>()
                        ?? GetComponentInParent<IFeedbackPlayer>()
                        ?? NullFeedbackPlayer.Instance;
        }

        private void OnEnable()
        {
            if (_input != null)
            {
                _input.SoulSkillEvent           += TrySoulSkill;
                _input.SpiritSkill1StartedEvent += TrySpiritSkill1;
                _input.SpiritSkill2StartedEvent += TrySpiritSkill2;
            }
            if (_formController != null)
            {
                _formController.OnFormChanged += OnFormChanged;
                // 立即同步当前形态的技能集
                ApplyFormSkills(_formController.CurrentForm);
            }
        }

        private void OnDisable()
        {
            if (_input != null)
            {
                _input.SoulSkillEvent           -= TrySoulSkill;
                _input.SpiritSkill1StartedEvent -= TrySpiritSkill1;
                _input.SpiritSkill2StartedEvent -= TrySpiritSkill2;
            }
            if (_formController != null)
                _formController.OnFormChanged -= OnFormChanged;
        }

        private void OnFormChanged()
        {
            ApplyFormSkills(_formController.CurrentForm);
        }

        private void ApplyFormSkills(FormSO form)
        {
            if (form == null || _formSkillSets == null) { UpdateSkillSet(null, null, null); return; }
            foreach (var s in _formSkillSets)
            {
                if (s.formType == form.formType)
                {
                    UpdateSkillSet(s.soulSkill, s.spiritSkill1, s.spiritSkill2);
                    return;
                }
            }
            UpdateSkillSet(null, null, null);
        }

        private void Update()
        {
            for (int i = 0; i < _activeSkills.Length; i++)
            {
                var s = _activeSkills[i];
                if (_cooldowns.TryGetValue(s, out float cd) && cd > 0f)
                    _cooldowns[s] = cd - Time.deltaTime;
            }
        }

        // ── 公共 API ─────────────────────────────────────────────────────────
        /// <summary>切换形态时由 FormController 调用，注入当前形态的三个技能。</summary>
        public void UpdateSkillSet(FormSkillSO soul, FormSkillSO spirit1, FormSkillSO spirit2)
        {
            _soulSkill = soul;
            _spirit1   = spirit1;
            _spirit2   = spirit2;

            _cooldowns.Clear();
            // 构建无分配遍历快照（固定大小数组，避免 List + ToArray GC）
            int count = (soul != null ? 1 : 0) + (spirit1 != null ? 1 : 0) + (spirit2 != null ? 1 : 0);
            if (_activeSkills.Length != count)
                _activeSkills = count > 0 ? new FormSkillSO[count] : System.Array.Empty<FormSkillSO>();
            int idx = 0;
            if (soul    != null) { _cooldowns[soul]    = 0f; _activeSkills[idx++] = soul; }
            if (spirit1 != null) { _cooldowns[spirit1] = 0f; _activeSkills[idx++] = spirit1; }
            if (spirit2 != null) { _cooldowns[spirit2] = 0f; _activeSkills[idx]   = spirit2; }
        }

        // ── 内部施放逻辑 ─────────────────────────────────────────────────────
        private void TrySoulSkill()    => TryCastSkill(_soulSkill);
        private void TrySpiritSkill1() => TryCastSkill(_spirit1);
        private void TrySpiritSkill2() => TryCastSkill(_spirit2);

        private void TryCastSkill(FormSkillSO skill)
        {
            if (skill == null) return;

            var p = _modifiers != null
                ? _modifiers.GetEffectiveParams(skill)
                : EffectiveSkillParams.FromBase(skill);

            if (!_cooldowns.TryGetValue(skill, out float cooldown) || cooldown > 0f) return;

            // 消耗资源
            bool consumed = skill.resourceType == SkillResourceType.SoulPower
                ? _stats.ConsumeSoulPower(p.effectiveCost)
                : _stats.ConsumeSpiritPower(p.effectiveCost);
            if (!consumed) return;

            _cooldowns[skill] = p.effectiveCooldown;

            // 施放反馈
            _feedback.TriggerPreset("skill_cast");

            // 播放动画（优先修改器动画，回退技能默认动画）
            var clip = p.effectiveAnimation.Clip != null
                ? p.effectiveAnimation
                : skill.castAnimation;
            if (clip.Clip != null && _animancer != null)
                _animancer.Play(clip);

            // 生成 HitBox Prefab（近战/爆炸类技能）
            if (skill.SkillHitBoxPrefab != null)
            {
                var socket = _skillSocket != null ? _skillSocket : transform;
                var inst   = GetOrCreateHitBox(skill.SkillHitBoxPrefab, socket);
                inst?.Activate(skill.damageSource, transform);
                inst?.AutoReturnAfter(skill.castLockDuration > 0f ? skill.castLockDuration : 0.5f);
            }
        }

        /// <summary>
        /// 从对象池获取或新建 SkillHitBoxInstance。
        /// 扫描该 prefab 已创建的实例列表，找到首个未激活的复用；
        /// 无可用实例时 Instantiate，并追加到列表供下次复用。
        /// </summary>
        private SkillHitBoxInstance GetOrCreateHitBox(GameObject prefab, Transform socket)
        {
            if (!_hitBoxPools.TryGetValue(prefab, out var list))
                _hitBoxPools[prefab] = list = new List<SkillHitBoxInstance>(2);

            for (int i = 0; i < list.Count; i++)
            {
                var pooled = list[i];
                if (pooled != null && !pooled.gameObject.activeSelf)
                {
                    pooled.transform.SetParent(socket);
                    pooled.transform.SetPositionAndRotation(socket.position, socket.rotation);
                    pooled.gameObject.SetActive(true);
                    return pooled;
                }
            }

            var go   = Object.Instantiate(prefab, socket.position, socket.rotation, socket);
            var inst = go.GetComponent<SkillHitBoxInstance>();
            if (inst != null) list.Add(inst);
            return inst;
        }

        // ── 属性查询 ─────────────────────────────────────────────────────────
        public FormSkillSO SoulSkill  => _soulSkill;
        public FormSkillSO Spirit1    => _spirit1;
        public FormSkillSO Spirit2    => _spirit2;

        public float SoulCooldownRatio =>
            (_soulSkill != null && _soulSkill.cooldown > 0 &&
             _cooldowns.TryGetValue(_soulSkill, out float cd))
                ? Mathf.Clamp01(cd / _soulSkill.cooldown) : 0f;
    }
}