//
//  ConversationOrchestrator.m
//  keyBoard
//
//  Created by Mac on 2026/1/15.
//

#import "ConversationOrchestrator.h"
#import "ASRStreamClient.h"
#import "AudioCaptureManager.h"
#import "AudioSessionManager.h"
#import "LLMStreamClient.h"
#import "Segmenter.h"
#import "SubtitleSync.h"
#import "TTSPlaybackPipeline.h"
#import "TTSServiceClient.h"

@interface ConversationOrchestrator () <
    AudioSessionManagerDelegate, AudioCaptureManagerDelegate,
    ASRStreamClientDelegate, LLMStreamClientDelegate, TTSServiceClientDelegate,
    TTSPlaybackPipelineDelegate>

// 模块
@property(nonatomic, strong) AudioSessionManager *audioSession;
@property(nonatomic, strong) AudioCaptureManager *audioCapture;
@property(nonatomic, strong) ASRStreamClient *asrClient;
@property(nonatomic, strong) LLMStreamClient *llmClient;
@property(nonatomic, strong) Segmenter *segmenter;
@property(nonatomic, strong) TTSServiceClient *ttsClient;
@property(nonatomic, strong) TTSPlaybackPipeline *playbackPipeline;
@property(nonatomic, strong) SubtitleSync *subtitleSync;

// 状态
@property(nonatomic, assign) ConversationState state;
@property(nonatomic, copy) NSString *conversationId;
@property(nonatomic, copy) NSString *currentSessionId;

// 文本跟踪
@property(nonatomic, strong) NSMutableString *fullAssistantText;
@property(nonatomic, strong)
    NSMutableDictionary<NSString *, NSString *> *segmentTextMap;
@property(nonatomic, assign) NSInteger segmentCounter;

// 队列
@property(nonatomic, strong) dispatch_queue_t orchestratorQueue;

@end

@implementation ConversationOrchestrator

#pragma mark - Initialization

- (instancetype)init {
  self = [super init];
  if (self) {
    _orchestratorQueue = dispatch_queue_create(
        "com.keyboard.aitalk.orchestrator", DISPATCH_QUEUE_SERIAL);
    _state = ConversationStateIdle;
    _conversationId = [[NSUUID UUID] UUIDString];

    _fullAssistantText = [[NSMutableString alloc] init];
    _segmentTextMap = [[NSMutableDictionary alloc] init];
    _segmentCounter = 0;

    [self setupModules];
  }
  return self;
}

- (void)setupModules {
  // Audio Session
  self.audioSession = [AudioSessionManager sharedManager];
  self.audioSession.delegate = self;

  // Audio Capture
  self.audioCapture = [[AudioCaptureManager alloc] init];
  self.audioCapture.delegate = self;

  // ASR Client
  self.asrClient = [[ASRStreamClient alloc] init];
  self.asrClient.delegate = self;

  // LLM Client
  self.llmClient = [[LLMStreamClient alloc] init];
  self.llmClient.delegate = self;

  // Segmenter
  self.segmenter = [[Segmenter alloc] init];

  // TTS Client
  self.ttsClient = [[TTSServiceClient alloc] init];
  self.ttsClient.delegate = self;

  // Playback Pipeline
  self.playbackPipeline = [[TTSPlaybackPipeline alloc] init];
  self.playbackPipeline.delegate = self;

  // Subtitle Sync
  self.subtitleSync = [[SubtitleSync alloc] init];
}

#pragma mark - Configuration Setters

- (void)setAsrServerURL:(NSString *)asrServerURL {
  _asrServerURL = [asrServerURL copy];
  self.asrClient.serverURL = asrServerURL;
}

- (void)setLlmServerURL:(NSString *)llmServerURL {
  _llmServerURL = [llmServerURL copy];
  self.llmClient.serverURL = llmServerURL;
}

- (void)setTtsServerURL:(NSString *)ttsServerURL {
  _ttsServerURL = [ttsServerURL copy];
  self.ttsClient.serverURL = ttsServerURL;
}

#pragma mark - User Actions

- (void)userDidPressRecord {
  dispatch_async(self.orchestratorQueue, ^{
    NSLog(@"[Orchestrator] userDidPressRecord, current state: %ld",
          (long)self.state);

    // 如果正在播放或思考，执行打断
    if (self.state == ConversationStateSpeaking ||
        self.state == ConversationStateThinking) {
      [self performBargein];
    }

    // 检查麦克风权限
    if (![self.audioSession hasMicrophonePermission]) {
      [self.audioSession requestMicrophonePermission:^(BOOL granted) {
        if (granted) {
          dispatch_async(self.orchestratorQueue, ^{
            [self startRecording];
          });
        }
      }];
      return;
    }

    [self startRecording];
  });
}

- (void)userDidReleaseRecord {
  dispatch_async(self.orchestratorQueue, ^{
    NSLog(@"[Orchestrator] userDidReleaseRecord, current state: %ld",
          (long)self.state);

    if (self.state != ConversationStateListening) {
      return;
    }

    // 停止采集
    [self.audioCapture stopCapture];

    // 请求 ASR 最终结果
    [self.asrClient finalize];

    // 更新状态
    [self updateState:ConversationStateRecognizing];
  });
}

- (void)stop {
  dispatch_async(self.orchestratorQueue, ^{
    [self cancelAll];
    [self updateState:ConversationStateIdle];
  });
}

#pragma mark - Private: Recording

- (void)startRecording {
  // 配置音频会话
  NSError *error = nil;
  if (![self.audioSession configureForConversation:&error]) {
    [self reportError:error];
    return;
  }

  if (![self.audioSession activateSession:&error]) {
    [self reportError:error];
    return;
  }

  // 生成新的会话 ID
  self.currentSessionId = [[NSUUID UUID] UUIDString];

  // 启动 ASR
  [self.asrClient startWithSessionId:self.currentSessionId];

  // 启动音频采集
  if (![self.audioCapture startCapture:&error]) {
    [self reportError:error];
    [self.asrClient cancel];
    return;
  }

  // 更新状态
  [self updateState:ConversationStateListening];
}

#pragma mark - Private: Barge-in (打断)

- (void)performBargein {
  NSLog(@"[Orchestrator] Performing barge-in");

  // 取消所有正在进行的请求
  [self.ttsClient cancel];
  [self.llmClient cancel];
  [self.asrClient cancel];

  // 停止播放
  [self.playbackPipeline stop];

  // 清空状态
  [self.segmenter reset];
  [self.segmentTextMap removeAllObjects];
  [self.fullAssistantText setString:@""];
  self.segmentCounter = 0;
}

- (void)cancelAll {
  [self.audioCapture stopCapture];
  [self.asrClient cancel];
  [self.llmClient cancel];
  [self.ttsClient cancel];
  [self.playbackPipeline stop];
  [self.segmenter reset];
  [self.audioSession deactivateSession];
}

#pragma mark - Private: State Management

- (void)updateState:(ConversationState)newState {
  if (self.state == newState)
    return;

  ConversationState oldState = self.state;
  self.state = newState;

  NSLog(@"[Orchestrator] State: %ld -> %ld", (long)oldState, (long)newState);

  dispatch_async(dispatch_get_main_queue(), ^{
    if (self.onStateChange) {
      self.onStateChange(newState);
    }

    // 特殊状态回调
    if (newState == ConversationStateSpeaking &&
        oldState != ConversationStateSpeaking) {
      if (self.onSpeakingStart) {
        self.onSpeakingStart();
      }
    }

    if (oldState == ConversationStateSpeaking &&
        newState != ConversationStateSpeaking) {
      if (self.onSpeakingEnd) {
        self.onSpeakingEnd();
      }
    }
  });
}

- (void)reportError:(NSError *)error {
  NSLog(@"[Orchestrator] Error: %@", error.localizedDescription);

  dispatch_async(dispatch_get_main_queue(), ^{
    if (self.onError) {
      self.onError(error);
    }
  });
}

#pragma mark - AudioCaptureManagerDelegate

- (void)audioCaptureManagerDidOutputPCMFrame:(NSData *)pcmFrame {
  // 发送到 ASR
  [self.asrClient sendAudioPCMFrame:pcmFrame];
}

- (void)audioCaptureManagerDidUpdateRMS:(float)rms {
  dispatch_async(dispatch_get_main_queue(), ^{
    if (self.onVolumeUpdate) {
      self.onVolumeUpdate(rms);
    }
  });
}

#pragma mark - AudioSessionManagerDelegate

- (void)audioSessionManagerDidInterrupt:(KBAudioSessionInterruptionType)type {
  dispatch_async(self.orchestratorQueue, ^{
    if (type == KBAudioSessionInterruptionTypeBegan) {
      // 中断开始：停止采集和播放
      [self cancelAll];
      [self updateState:ConversationStateIdle];
    }
  });
}

- (void)audioSessionManagerMicrophonePermissionDenied {
  NSError *error =
      [NSError errorWithDomain:@"ConversationOrchestrator"
                          code:-1
                      userInfo:@{
                        NSLocalizedDescriptionKey : @"请在设置中开启麦克风权限"
                      }];
  [self reportError:error];
}

#pragma mark - ASRStreamClientDelegate

- (void)asrClientDidReceivePartialText:(NSString *)text {
  dispatch_async(dispatch_get_main_queue(), ^{
    if (self.onPartialText) {
      self.onPartialText(text);
    }
  });
}

- (void)asrClientDidReceiveFinalText:(NSString *)text {
  dispatch_async(self.orchestratorQueue, ^{
    NSLog(@"[Orchestrator] ASR final text: %@", text);

    // 回调用户文本
    dispatch_async(dispatch_get_main_queue(), ^{
      if (self.onUserFinalText) {
        self.onUserFinalText(text);
      }
    });

    // 如果文本为空，回到空闲
    if (text.length == 0) {
      [self updateState:ConversationStateIdle];
      return;
    }

    // 更新状态并开始 LLM 请求
    [self updateState:ConversationStateThinking];

    // 重置文本跟踪
    [self.fullAssistantText setString:@""];
    [self.segmentTextMap removeAllObjects];
    self.segmentCounter = 0;
    [self.segmenter reset];

    // 启动播放管线
    NSError *error = nil;
    if (![self.playbackPipeline start:&error]) {
      NSLog(@"[Orchestrator] Failed to start playback pipeline: %@",
            error.localizedDescription);
    }

    // 发送 LLM 请求
    [self.llmClient sendUserText:text conversationId:self.conversationId];
  });
}

- (void)asrClientDidFail:(NSError *)error {
  dispatch_async(self.orchestratorQueue, ^{
    [self reportError:error];
    [self updateState:ConversationStateIdle];
  });
}

#pragma mark - LLMStreamClientDelegate

- (void)llmClientDidReceiveToken:(NSString *)token {
  dispatch_async(self.orchestratorQueue, ^{
    // 追加到完整文本
    [self.fullAssistantText appendString:token];

    // 追加到分段器
    [self.segmenter appendToken:token];

    // 检查是否有可触发 TTS 的片段
    NSArray<NSString *> *segments = [self.segmenter popReadySegments];
    for (NSString *segmentText in segments) {
      [self requestTTSForSegment:segmentText];
    }
  });
}

- (void)llmClientDidComplete {
  dispatch_async(self.orchestratorQueue, ^{
    NSLog(@"[Orchestrator] LLM complete");

    // 处理剩余片段
    NSString *remaining = [self.segmenter flushRemainingSegment];
    if (remaining && remaining.length > 0) {
      [self requestTTSForSegment:remaining];
    }

    // 回调完整文本
    NSString *fullText = [self.fullAssistantText copy];
    dispatch_async(dispatch_get_main_queue(), ^{
      if (self.onAssistantFullText) {
        self.onAssistantFullText(fullText);
      }
    });
  });
}

- (void)llmClientDidFail:(NSError *)error {
  dispatch_async(self.orchestratorQueue, ^{
    [self reportError:error];
    [self updateState:ConversationStateIdle];
  });
}

#pragma mark - Private: TTS Request

- (void)requestTTSForSegment:(NSString *)segmentText {
  NSString *segmentId =
      [NSString stringWithFormat:@"seg_%ld", (long)self.segmentCounter++];

  // 记录片段文本
  self.segmentTextMap[segmentId] = segmentText;

  NSLog(@"[Orchestrator] Requesting TTS for segment %@: %@", segmentId,
        segmentText);

  // 请求 TTS
  [self.ttsClient requestTTSForText:segmentText segmentId:segmentId];
}

#pragma mark - TTSServiceClientDelegate

- (void)ttsClientDidReceiveURL:(NSURL *)url segmentId:(NSString *)segmentId {
  dispatch_async(self.orchestratorQueue, ^{
    [self.playbackPipeline enqueueURL:url segmentId:segmentId];

    // 如果还在 Thinking，切换到 Speaking
    if (self.state == ConversationStateThinking) {
      [self updateState:ConversationStateSpeaking];
    }
  });
}

- (void)ttsClientDidReceiveAudioChunk:(NSData *)chunk
                          payloadType:(TTSPayloadType)type
                            segmentId:(NSString *)segmentId {
  dispatch_async(self.orchestratorQueue, ^{
    [self.playbackPipeline enqueueChunk:chunk
                            payloadType:type
                              segmentId:segmentId];

    // 如果还在 Thinking，切换到 Speaking
    if (self.state == ConversationStateThinking) {
      [self updateState:ConversationStateSpeaking];
    }
  });
}

- (void)ttsClientDidFinishSegment:(NSString *)segmentId {
  dispatch_async(self.orchestratorQueue, ^{
    [self.playbackPipeline markSegmentComplete:segmentId];
  });
}

- (void)ttsClientDidFail:(NSError *)error {
  dispatch_async(self.orchestratorQueue, ^{
    [self reportError:error];
  });
}

#pragma mark - TTSPlaybackPipelineDelegate

- (void)pipelineDidStartSegment:(NSString *)segmentId
                       duration:(NSTimeInterval)duration {
  NSLog(@"[Orchestrator] Started playing segment: %@", segmentId);
}

- (void)pipelineDidUpdatePlaybackTime:(NSTimeInterval)time
                            segmentId:(NSString *)segmentId {
  dispatch_async(self.orchestratorQueue, ^{
    // 获取片段文本
    NSString *segmentText = self.segmentTextMap[segmentId];
    if (!segmentText)
      return;

    // 计算可见文本
    NSTimeInterval duration =
        [self.playbackPipeline durationForSegment:segmentId];
    NSString *visibleText =
        [self.subtitleSync visibleTextForFullText:segmentText
                                      currentTime:time
                                         duration:duration];

    // TODO: 这里应该累加之前片段的文本，实现完整的打字机效果
    // 简化实现：只显示当前片段
    dispatch_async(dispatch_get_main_queue(), ^{
      if (self.onAssistantVisibleText) {
        self.onAssistantVisibleText(visibleText);
      }
    });
  });
}

- (void)pipelineDidFinishSegment:(NSString *)segmentId {
  NSLog(@"[Orchestrator] Finished playing segment: %@", segmentId);
}

- (void)pipelineDidFinishAllSegments {
  dispatch_async(self.orchestratorQueue, ^{
    NSLog(@"[Orchestrator] All segments finished");

    // 回到空闲状态
    [self updateState:ConversationStateIdle];
    [self.audioSession deactivateSession];
  });
}

- (void)pipelineDidFail:(NSError *)error {
  dispatch_async(self.orchestratorQueue, ^{
    [self reportError:error];
    [self updateState:ConversationStateIdle];
  });
}

@end