using System;
using System.Collections.Generic;
using Cielonos.MainGame.UI;
using Sirenix.OdinInspector;
using SLSUtilities.WwiseAssistance;
using UnityEngine;

namespace Cielonos.MainGame
{
    /// <summary>
    /// 音乐节拍战斗系统。激活时覆盖 BackgroundMusicManager 播放对应 BGM，
    /// 通过 Wwise AK_MusicSyncBeat 回调 + MusicBeatData 谱面进行双轨节拍追踪，
    /// 对外提供 Judge / IsOnBeat / GetBeatAccuracy 判定 API 和节拍事件
    /// </summary>
    public class MusicBeatSystem : CombatSystemBase
    {
        #region Constants

        /// <summary>
        /// Perfect 判定窗口（秒），节拍前后各此值范围内判定为 Perfect
        /// </summary>
        private const float PERFECT_TOLERANCE = 0.15f;

        /// <summary>
        /// Good 判定窗口（秒）
        /// </summary>
        private const float GOOD_TOLERANCE = 0.2f;

        /// <summary>
        /// Miss 判定窗口（秒），超出此范围不触发判定
        /// </summary>
        private const float MISS_TOLERANCE = 0.2f;

        /// <summary>
        /// Wwise 回调到 Unity 主线程的时间吸附阈值（秒），
        /// 超过此值的校准可能是异常数据，忽略
        /// </summary>
        private const float SYNC_SNAP_THRESHOLD = 0.5f;

        #endregion

        #region Public State

        /// <summary>
        /// 当前加载的谱面数据
        /// </summary>
        [ShowInInspector, ReadOnly]
        public MusicBeatData CurrentBeatData { get; private set; }

        /// <summary>
        /// 系统是否已激活（谱面已加载、BGM 已请求播放）
        /// </summary>
        [ShowInInspector, ReadOnly]
        public bool IsActive { get; private set; }

        /// <summary>
        /// Wwise 音乐是否已真正开始播放（首次 MusicSync 回调到来后为 true）
        /// </summary>
        [ShowInInspector, ReadOnly]
        public bool IsPlaying { get; private set; }

        /// <summary>
        /// 当前音乐播放时间（秒），由 deltaTime 推进 + Wwise 回调校准
        /// </summary>
        [ShowInInspector, ReadOnly]
        public float CurrentSongTime { get; private set; }

        /// <summary>
        /// 当前实际 BPM（由 Wwise 回调报告的 beatDuration 反推，若无回调则使用谱面 BPM）
        /// </summary>
        [ShowInInspector, ReadOnly]
        public float CurrentBPM { get; private set; }

        #endregion

        #region Events

        /// <summary>
        /// 每次到达谱面中的节拍时触发（UI 和敌人 AI 订阅）
        /// </summary>
        public event Action<BeatMarker> OnBeat;

        /// <summary>
        /// 玩家操作被判定后触发
        /// </summary>
        public event Action<BeatJudgement> OnPlayerBeatJudged;

        /// <summary>
        /// 系统激活时触发
        /// </summary>
        public event Action<MusicBeatData> OnActivated;

        /// <summary>
        /// 系统停用时触发
        /// </summary>
        public event Action OnDeactivated;

        #endregion

        #region Private Fields

        /// <summary>
        /// 下一个待触发的节拍索引（在 beatMarkers 中的 index）
        /// </summary>
        private int nextBeatIndex;

        /// <summary>
        /// Wwise 播放实例 ID
        /// </summary>
        private uint wwisePlayingID;

        /// <summary>
        /// BackgroundMusicManager 引用缓存
        /// </summary>
        private BackgroundMusicManager bgmManager;

        /// <summary>
        /// Wwise 回调产生的待处理校准数据（从回调线程安全传递到主线程）
        /// </summary>
        [ShowInInspector]
        private volatile float pendingSyncTime = -1f;

        /// <summary>
        /// Wwise 回调报告的 beatDuration（秒），用于反推实际 BPM
        /// </summary>
        [ShowInInspector]
        private volatile float pendingBeatDuration = -1f;

        #endregion

        #region Lifecycle

        public MusicBeatData testData;

        private void Awake()
        {
            bgmManager = AudioManager.Instance.backgroundMusicManager;
        }

        private void Update()
        {
            if (!IsActive) return;

            // 处理 Wwise 回调带来的时间校准
            ProcessPendingSync();

            if (!IsPlaying) return;

            // 推进音乐时间
            CurrentSongTime += Time.deltaTime;

            // 检查并触发节拍事件
            ProcessBeatEvents();
        }

        private void OnDestroy()
        {
            if (IsActive)
            {
                Deactivate();
            }
        }

        #endregion

        #region Activate / Deactivate
        
        [Button("Activate Test Data")]
        public void Activate()
        {
            if (testData != null)
            {
                Activate(testData);
            }
            else
            {
                Debug.LogWarning("[MusicBeatSystem] No test data assigned for activation");
            }
        }
        
        /// <summary>
        /// 激活节拍系统：加载谱面、覆盖 BGM、注册 Wwise 回调
        /// </summary>
        /// <param name="beatData">要加载的谱面数据</param>
        public void Activate(MusicBeatData beatData)
        {
            if (beatData == null)
            {
                Debug.LogError("[MusicBeatSystem] Activate failed: beatData is null");
                return;
            }

            if (IsActive)
            {
                Deactivate();
            }

            CurrentBeatData = beatData;
            CurrentBPM = beatData.bpm;
            CurrentSongTime = 0f;
            nextBeatIndex = 0;
            IsPlaying = false;
            IsActive = true;

            // 覆盖 BackgroundMusicManager：先停止当前 BGM，再标记覆盖
            if (bgmManager != null)
            {
                bgmManager.StopMusic();
                bgmManager.SetOverride(true);
            }

            // 在 MusicBeatSystem 自身的 gameObject 上播放节拍音乐
            // 与 BackgroundMusicManager 的 gameObject 隔离，避免 Stop Event 作用域冲突
            if (beatData.musicEvent != null && beatData.musicEvent.IsValid())
            {
                uint callbackFlags = (uint)(AkCallbackType.AK_MusicSyncBeat | AkCallbackType.AK_EndOfEvent);
                beatData.musicSwitch.SetValue(gameObject); // 设置 Switch 以选择正确的音乐变体
                PlayerCanvas.CombatSystemsUIArea.beatTimelineUI.Initialize(this);
                wwisePlayingID = beatData.musicEvent.Post(
                    gameObject,
                    callbackFlags,
                    OnWwiseMusicCallback,
                    null
                );

                if (wwisePlayingID == 0)
                {
                    Debug.LogWarning("[MusicBeatSystem] Wwise Post returned playingID 0, music may not play. " +
                                     "Check: 1) musicEvent references a Music type (not Sound SFX) " +
                                     "2) SoundBank is loaded 3) gameObject is active");
                }
                else
                {
                    Debug.Log($"[MusicBeatSystem] Activated with '{beatData.name}', playingID={wwisePlayingID}, " +
                              $"posting on GameObject '{gameObject.name}'");
                }
            }
            else
            {
                // 无 Wwise Event 时，使用纯谱面模式（仅基于 deltaTime 和谱面数据）
                Debug.LogWarning("[MusicBeatSystem] No valid Wwise Event on beatData, running in offline mode");
                IsPlaying = true;
            }

            OnActivated?.Invoke(beatData);
        }

        /// <summary>
        /// 停用节拍系统：停止追踪、恢复 BackgroundMusicManager 控制
        /// </summary>
        public void Deactivate()
        {
            if (!IsActive) return;

            IsActive = false;
            IsPlaying = false;
            CurrentSongTime = 0f;
            nextBeatIndex = 0;
            pendingSyncTime = -1f;
            pendingBeatDuration = -1f;

            // 停止 MusicBeatSystem 自己 Post 的节拍音乐
            if (wwisePlayingID != 0)
            {
                AkUnitySoundEngine.StopPlayingID(wwisePlayingID);
                wwisePlayingID = 0;
            }

            // 如果 beatData 有独立的 stopMusicEvent，也 Post 一下确保停止
            if (CurrentBeatData != null && CurrentBeatData.stopMusicEvent != null && CurrentBeatData.stopMusicEvent.IsValid())
            {
                CurrentBeatData.stopMusicEvent.Post(gameObject);
            }

            // 恢复 BackgroundMusicManager
            if (bgmManager != null)
            {
                bgmManager.SetOverride(false);
                bgmManager.PlayMusic("NormalMusic");
            }

            CurrentBeatData = null;

            Debug.Log("[MusicBeatSystem] Deactivated");
            OnDeactivated?.Invoke();
        }

        #endregion

        #region Judgement API

        public BeatJudgement Judge()
        {
            return Judge(CurrentSongTime);
        }
        
        /// <summary>
        /// 判定指定时间点的操作是否卡拍
        /// </summary>
        /// <param name="actionTime">操作发生时的 CurrentSongTime（通常传入 CurrentSongTime）</param>
        /// <returns>判定结果，若超出 Miss 窗口则 accuracy 为 Miss</returns>
        public BeatJudgement Judge(float actionTime)
        {
            BeatMarker nearest = CurrentBeatData?.GetNearestBeat(actionTime, MISS_TOLERANCE);

            if (nearest == null)
            {
                return new BeatJudgement(BeatAccuracy.Miss, float.MaxValue, null, 1f);
            }

            float timeDiff = actionTime - nearest.time;
            float absDiff = Mathf.Abs(timeDiff);

            BeatAccuracy accuracy;
            float normalized;

            if (absDiff <= PERFECT_TOLERANCE)
            {
                accuracy = BeatAccuracy.Perfect;
                normalized = absDiff / PERFECT_TOLERANCE;
            }
            else if (absDiff <= GOOD_TOLERANCE)
            {
                accuracy = BeatAccuracy.Good;
                normalized = absDiff / GOOD_TOLERANCE;
            }
            else
            {
                accuracy = BeatAccuracy.Miss;
                normalized = Mathf.Clamp01(absDiff / MISS_TOLERANCE);
            }

            var judgement = new BeatJudgement(accuracy, timeDiff, nearest, normalized);
            OnPlayerBeatJudged?.Invoke(judgement);
            return judgement;
        }

        /// <summary>
        /// 简化版判定，仅返回精度等级
        /// </summary>
        public BeatAccuracy GetBeatAccuracy(float actionTime)
        {
            return Judge(actionTime).accuracy;
        }

        /// <summary>
        /// 判定指定时间点是否处于节拍窗口内
        /// </summary>
        /// <param name="actionTime">操作时间</param>
        /// <param name="customTolerance">自定义容差，-1 表示使用 GOOD_TOLERANCE</param>
        public bool IsOnBeat(float actionTime, float customTolerance = -1f)
        {
            float tolerance = customTolerance > 0f ? customTolerance : GOOD_TOLERANCE;
            BeatMarker nearest = CurrentBeatData?.GetNearestBeat(actionTime, tolerance);
            return nearest != null;
        }

        #endregion

        #region Beat Query API

        public BeatMarker GetNearestBeat(float tolerance)
        {
            return CurrentBeatData?.GetNearestBeat(CurrentSongTime, tolerance);
        }
        
        public BeatMarker GetLastBeat()
        {
            return CurrentBeatData?.GetLastBeat(CurrentSongTime);
        }
        
        /// <summary>
        /// 获取下一个节拍标记
        /// </summary>
        public BeatMarker GetNextBeat()
        {
            return CurrentBeatData?.GetNextBeat(CurrentSongTime);
        }

        /// <summary>
        /// 获取下一个带有特定 tag 的节拍标记
        /// </summary>
        public BeatMarker GetNextBeatWithTag(string tag)
        {
            return CurrentBeatData?.GetNextBeatWithTag(CurrentSongTime, tag);
        }

        /// <summary>
        /// 到下一拍的剩余时间（秒），若无下一拍返回 -1
        /// </summary>
        public float GetTimeUntilNextBeat()
        {
            BeatMarker next = GetNextBeat();
            return next != null ? next.time - CurrentSongTime : -1f;
        }

        /// <summary>
        /// 到指定节拍的剩余时间（秒）
        /// </summary>
        public float GetTimeUntilBeat(BeatMarker beat)
        {
            if (beat == null) return -1f;
            return beat.time - CurrentSongTime;
        }

        /// <summary>
        /// 获取指定时间范围内的所有节拍标记
        /// </summary>
        public List<BeatMarker> GetBeatsInRange(float startTime, float endTime)
        {
            return CurrentBeatData?.GetBeatsInRange(startTime, endTime) ?? new List<BeatMarker>();
        }

        #endregion

        #region Internal - Wwise Callback

        /// <summary>
        /// Wwise 音乐回调处理器（可能在非主线程调用）
        /// </summary>
        private void OnWwiseMusicCallback(object in_cookie, AkCallbackType in_type, AkCallbackInfo in_info)
        {
            if (in_type == AkCallbackType.AK_MusicSyncBeat)
            {
                if (in_info is AkMusicSyncCallbackInfo syncInfo)
                {
                    // 从 Wwise 获取精确的音乐播放位置和节拍信息
                    // segmentInfo_iCurrentPosition 是当前 segment 内的播放位置（毫秒）
                    float musicPositionSec = syncInfo.segmentInfo_iCurrentPosition / 1000f;
                    float beatDuration = syncInfo.segmentInfo_fBeatDuration;

                    // 将校准数据传递到主线程处理
                    pendingSyncTime = musicPositionSec + CurrentBeatData.audioStartOffset;
                    pendingBeatDuration = beatDuration;
                }
                else
                {
                    Debug.LogWarning($"[MusicBeatSystem] Received MusicSync callback with unexpected info type: {in_info.GetType().Name}");
                }
            }
            else if (in_type == AkCallbackType.AK_EndOfEvent)
            {
                // 音乐播放结束
                Debug.Log("[MusicBeatSystem] Music playback ended");
            }
        }

        #endregion

        #region Internal - Beat Processing

        /// <summary>
        /// 处理来自 Wwise 回调的时间校准（在主线程 Update 中调用）
        /// </summary>
        private void ProcessPendingSync()
        {
            float syncTime = pendingSyncTime;
            float beatDur = pendingBeatDuration;

            if (syncTime < 0f) return;

            // 消费 pending 数据
            pendingSyncTime = -1f;
            pendingBeatDuration = -1f;

            // 首次收到回调，标记为正在播放
            if (!IsPlaying)
            {
                IsPlaying = true;
                CurrentSongTime = syncTime;
                Debug.Log($"[MusicBeatSystem] First beat sync received, music is now playing. SyncTime={syncTime:F3}s");
                return;
            }

            // 时间校准：将 currentSongTime 吸附到 Wwise 报告的位置
            float drift = Mathf.Abs(CurrentSongTime - syncTime);
            if (drift < SYNC_SNAP_THRESHOLD)
            {
                CurrentSongTime = syncTime;
            }
            else
            {
                Debug.LogWarning($"[MusicBeatSystem] Large sync drift detected: {drift:F3}s, ignoring calibration");
            }

            // 更新实际 BPM
            if (beatDur > 0f)
            {
                CurrentBPM = 60f / beatDur;
            }
        }

        /// <summary>
        /// 检查是否到达下一个节拍，触发 onBeat 事件
        /// </summary>
        private void ProcessBeatEvents()
        {
            if (CurrentBeatData == null || CurrentBeatData.beatMarkers == null) return;

            var markers = CurrentBeatData.beatMarkers;

            // 触发所有已经过去的未处理节拍
            while (nextBeatIndex < markers.Count && CurrentSongTime >= markers[nextBeatIndex].time)
            {
                BeatMarker beat = markers[nextBeatIndex];
                nextBeatIndex++;

                OnBeat?.Invoke(beat);
            }
        }

        #endregion
    }
}