using System.Collections;
using Animancer;
using BaseGames.Combat;
using BaseGames.Core;
using BaseGames.Core.Pool;
using UnityEngine;
using UnityEngine.Events;

namespace BaseGames.Enemies.Boss
{
    /// <summary>
    /// 嘲风 Boss 主脚本。
    ///
    /// Phase 0（地面）：4 技能加权随机（回旋扇/扇形连击/小龙卷/大龙卷）。
    /// Phase 1（空中）：风石技能 + 击落计数机制。
    ///
    /// 阶段过渡流程：
    ///   1. BossBase.BeginPhaseTransition → OnBeginPhaseTransition(1) 立即播放过渡动画 + 开始浮空
    ///   2. 无敌期结束（≥ _riseDuration+buffer）→ BossBase.EnterPhase(1) 广播阶段切换事件
    ///
    /// ⚠️ 动画由本脚本通过 Animancer.Play() 完整控制，不在 BD 中调用 BD_PlayAnimation。
    /// </summary>
    public class ChaoFengBoss : BossBase
    {
        [Header("浮空 / 击落")]
        [SerializeField] private ChaoFengFloatController  _floatController;
        [SerializeField] private ChaoFengKnockdownCounter _knockdownCounter;

        [Header("阶段过渡动画")]
        [SerializeField] private ClipTransition _phaseTransitionClip;

        [Header("回旋扇收招动画")]
        [SerializeField] private ClipTransition _boomerangEndClip;

        [Header("弹体发射点")]
        [SerializeField] private Transform _boomerangMuzzle;
        [SerializeField] private Transform _tornadoMuzzle;
        [SerializeField] private Transform _windStoneMuzzle;

        [Header("弹体配置（ProjectileConfigSO，PoolKey 须与弹体地址一致）")]
        [SerializeField] private ProjectileConfigSO _boomerangConfig;
        [SerializeField] private ProjectileConfigSO _tornadoSmallConfig;
        [SerializeField] private ProjectileConfigSO _tornadoLargeConfig;
        [SerializeField] private ProjectileConfigSO _windStoneConfig;

        [Header("击败演出动画")]
        [SerializeField] private ClipTransition _defeatStruggleClip;
        [Tooltip("倒地喘气（循环）；与 ChaoFengKnockdownCounter._staggerClip 共用同一 Clip")]
        [SerializeField] private ClipTransition _defeatPantClip;
        [SerializeField] private ClipTransition _defeatStandUpClip;
        [SerializeField] private float          _defeatPantDuration = 3f;

        [Header("白屏回调（可接 CameraManager / VFX Event）")]
        [SerializeField] private UnityEngine.Events.UnityEvent _onDefeatWhiteFlash;

        // ── 阶段过渡钩子 ─────────────────────────────────────────────────────

        /// <summary>
        /// 阶段过渡开始时立即播放过渡动画并启动浮空协程。
        /// invincibleDuration 需在 BD_BossPhaseTransition 中配置为 ≥ _riseDuration + 缓冲（约 2.0s）。
        /// </summary>
        protected override void OnBeginPhaseTransition(int targetPhase)
        {
            if (targetPhase == 1)
            {
                if (_phaseTransitionClip.Clip != null)
                    Animancer.Play(_phaseTransitionClip);
                StartCoroutine(_floatController.FloatUp());
            }
        }

        // ── 受击转发 ─────────────────────────────────────────────────────────

        /// <summary>
        /// 转发受击事件至击落计数器。
        /// ⚠️ HurtBox 无公开 OnDamageTaken 事件，必须通过此虚方法转发。
        /// </summary>
        protected override void OnDamageTaken(DamageInfo info)
        {
            base.OnDamageTaken(info);
            _knockdownCounter?.OnBossHit(info);
        }

        // ── 动画事件 ─────────────────────────────────────────────────────────

        /// <summary>
        /// 回旋扇返回时由 ReturnProjectile 调用，触发收扇动画。
        /// </summary>
        public void OnBoomerangReturned()
        {
            if (_boomerangEndClip.Clip != null)
                Animancer.Play(_boomerangEndClip);
        }

        // ── 弹体生成 ─────────────────────────────────────────────────────────

        /// <summary>
        /// 由技能动画 AnimationEvent 触发，生成对应弹体。
        /// payload: "boomerang" / "tornado_small" / "tornado_large" / "wind_stone"
        /// 生成后通过 ProjectileConfigSO 调用 Projectile.Initialize 注入速度/重力/伤害源与方向。
        /// </summary>
        public override void SpawnProjectile(string payload)
        {
            var pool = ServiceLocator.GetOrDefault<IObjectPoolService>();
            if (pool == null) return;

            switch (payload)
            {
                case "boomerang":
                    SpawnConfiguredAt(pool, _boomerangConfig, "PROJ_Boomerang",
                        MuzzlePos(_boomerangMuzzle), AimDir(_boomerangMuzzle),
                        proj => (proj as ReturnProjectile)?.SetOwner(transform));
                    break;

                case "tornado_small":
                    SpawnConfiguredAt(pool, _tornadoSmallConfig, "PROJ_TornadoSmall",
                        MuzzlePos(_tornadoMuzzle), AimDir(_tornadoMuzzle), null);
                    break;

                case "tornado_large":
                    // 定点召唤于玩家当前位置（落点锁定）
                    if (PlayerTransform != null)
                        SpawnConfiguredAt(pool, _tornadoLargeConfig, "PROJ_TornadoLarge",
                            PlayerTransform.position, Vector2.down, null);
                    break;

                case "wind_stone":
                    SpawnConfiguredAt(pool, _windStoneConfig, "PROJ_WindStone",
                        MuzzlePos(_windStoneMuzzle), Vector2.down, null);
                    break;
            }
        }

        private Vector2 MuzzlePos(Transform muzzle)
            => muzzle != null ? (Vector2)muzzle.position : (Vector2)transform.position;

        /// <summary>朝向玩家的发射方向；无玩家时退回当前朝向（localScale.x）。</summary>
        private Vector2 AimDir(Transform muzzle)
        {
            Vector2 origin = MuzzlePos(muzzle);
            if (PlayerTransform != null)
                return ((Vector2)PlayerTransform.position - origin).normalized;
            return transform.localScale.x >= 0f ? Vector2.right : Vector2.left;
        }

        /// <summary>
        /// 从池取出弹体并用 config 初始化（注入速度/重力/伤害源/方向）。
        /// config 为空时仅生成不初始化并告警（需在 Inspector 指定对应 ProjectileConfigSO）。
        /// </summary>
        private void SpawnConfiguredAt(IObjectPoolService pool, ProjectileConfigSO config, string fallbackKey,
                                       Vector2 pos, Vector2 dir, System.Action<Projectile> onSpawned)
        {
            string key = config != null && !string.IsNullOrEmpty(config.PoolKey) ? config.PoolKey : fallbackKey;
            var go = pool.Spawn(key, pos, Quaternion.identity);
            if (go == null) return;

            var proj = go.GetComponent<Projectile>();
            if (proj == null)
            {
                Debug.LogWarning($"[ChaoFengBoss] 弹体 '{key}' 缺少 Projectile 组件。", this);
                return;
            }

            onSpawned?.Invoke(proj);

            if (config == null)
            {
                Debug.LogWarning($"[ChaoFengBoss] 弹体 '{key}' 未指定 ProjectileConfigSO，无法初始化速度/伤害。", this);
                return;
            }

            var src  = config.DamageSource;
            var info = src != null
                ? DamageInfo.From(src, dir, pos, gameObject.layer, proj)
                : default;
            proj.Initialize(config, info, dir, gameObject.layer);
        }

        // ── 击败演出 ─────────────────────────────────────────────────────────

        protected override void Die()
        {
            StartCoroutine(DefeatSequence());
        }

        private IEnumerator DefeatSequence()
        {
            StopBehaviorTree();
            _knockdownCounter?.ForceEnd();

            // Phase 2（空中）先落地
            if (CurrentPhase >= 1 && _floatController != null)
                yield return _floatController.FallDown();

            // 空中挣扎（Defeat_Struggle）
            if (_defeatStruggleClip.Clip != null)
            {
                Animancer.Play(_defeatStruggleClip);
                yield return new WaitForSeconds(_defeatStruggleClip.Clip.length);
            }

            // 白屏效果
            _onDefeatWhiteFlash?.Invoke();

            // 倒地喘气（Defeat_Pant 循环）
            if (_defeatPantClip.Clip != null)
                Animancer.Play(_defeatPantClip);
            yield return new WaitForSeconds(_defeatPantDuration);

            // 站起（Defeat_StandUp 单次）
            if (_defeatStandUpClip.Clip != null)
            {
                Animancer.Play(_defeatStandUpClip);
                yield return new WaitForSeconds(_defeatStandUpClip.Clip.length);
            }

            // 广播战斗结束、触发结算过场
            base.Die();
        }
    }
}