import Foundation
import AVFoundation
import MicrosoftCognitiveServicesSpeech

/// Azure 语音识别辅助类
class AzureAsrHelper: NSObject {
    private var recognizer: SPXSpeechRecognizer?
    private var speechConfig: SPXSpeechConfig?
    private var audioConfig: SPXAudioConfig?
    private var initialized = false
    private var isContinuousRecognitionActive = false
    private var currentLanguage = "zh-CN"
    private var subscriptionKey = ""
    private var serviceRegion = ""
    private var isAutoDetectLanguage = false
    private var supportedLanguages = ["zh-CN", "en-US"]
    
    // 音频会话管理
    private let audioSession = AVAudioSession.sharedInstance()
    
    // 事件回调
    private var eventHandler: (([String: Any]) -> Void)?
    
    /// 设置事件处理器
    ///
    /// - Parameter handler: 事件处理回调
    func setEventHandler(_ handler: @escaping ([String: Any]) -> Void) {
        self.eventHandler = handler
    }
    
    /// 初始化语音识别服务
    ///
    /// - Parameters:
    ///   - speechSubscriptionKey: Azure 语音服务订阅密钥
    ///   - serviceRegion: Azure 语音服务区域
    ///   - supportedLanguages: 支持的语言列表，默认为 ["zh-CN", "en-US"]
    /// - Returns: 是否初始化成功
    func initialize(speechSubscriptionKey: String, serviceRegion: String, supportedLanguages: [String] = ["zh-CN", "en-US"]) -> Bool {
        print("[AzureAsrHelper] 初始化 Azure 语音服务")
        
        // 检查配置是否为空
        if speechSubscriptionKey.isEmpty || serviceRegion.isEmpty {
            print("[AzureAsrHelper] 错误: Azure 配置信息不完整")
            return false
        }
        
        // 释放之前的资源
        dispose()
        
        // 保存配置
        self.subscriptionKey = speechSubscriptionKey
        self.serviceRegion = serviceRegion
        
        // 设置语言
        if supportedLanguages.isEmpty {
            print("[AzureAsrHelper] 警告: 传入的支持语言列表为空，将使用默认语言")
        } else {
            self.supportedLanguages = supportedLanguages
        }
        
        // 根据支持的语言数量决定是否启用自动语言检测
        self.isAutoDetectLanguage = supportedLanguages.count >= 2
        
        // 如果只有一种语言，设置为当前语言
        if !isAutoDetectLanguage && !supportedLanguages.isEmpty {
            self.currentLanguage = supportedLanguages[0]
        }
        
        // 创建语音配置
        do {
            speechConfig = try SPXSpeechConfig(subscription: speechSubscriptionKey, region: serviceRegion)
            
            // 设置语言配置
            if isAutoDetectLanguage {
                // 设置自动语言检测
                try speechConfig?.setPropertyTo("Continuous", byId: SPXPropertyId.SpeechServiceConnection_LanguageIdMode)
            } else {
                // 设置指定的识别语言
                speechConfig?.speechRecognitionLanguage = currentLanguage
            }
            
            // 创建音频配置 - 使用默认麦克风
            audioConfig = SPXAudioConfig.default()
            
            // 创建识别器
            if isAutoDetectLanguage {
                let autoDetectConfig = try SPXAutoDetectSourceLanguageConfiguration(sourceLanguages: supportedLanguages)
                recognizer = try SPXSpeechRecognizer(speechConfiguration: speechConfig!, autoDetectSourceLanguageConfiguration: autoDetectConfig, audioConfiguration: audioConfig!)
            } else {
                recognizer = try SPXSpeechRecognizer(speechConfiguration: speechConfig!, audioConfiguration: audioConfig!)
            }
            
            // 配置音频会话
            try configureAudioSession()
            
            initialized = true
            print("[AzureAsrHelper] Azure 语音服务初始化成功")
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 创建识别器失败: \(error.localizedDescription)")
            return false
        }
    }
    
    /// 配置音频会话
    private func configureAudioSession() throws {
        print("[AzureAsrHelper] 开始配置音频会话...")
        
        do {
            // 设置音频会话类别和模式
            try audioSession.setCategory(.record, mode: .measurement, options: [.duckOthers, .allowBluetooth])
            try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
        } catch {
            print("[AzureAsrHelper] 警告: 通过AudioSessionManager配置音频会话失败")
            throw error
        }
    }
    
    /// 一次性语音识别
    ///
    /// - Parameter completion: 完成回调，返回是否成功、识别文本、识别语言和可能的错误信息
    func recognizeOnce(completion: @escaping (Bool, String?, String?, String?) -> Void) {
        if !initialized {
            completion(false, nil, nil, "语音服务未初始化")
            return
        }
        
        // 重置 recognizer
        if !resetRecognizer() {
            completion(false, nil, nil, "重置识别器失败")
            return
        }
        
        do {
            // 激活音频会话
            try audioSession.setActive(true)
            
            // 添加识别事件处理
            recognizer?.addRecognizedEventHandler { [weak self] _, event in
                guard let self = self else { return }
                
                if event.result.reason == .recognizedSpeech {
                    let detectedLanguage = self.getDetectedLanguage(from: event.result)
                    print("[AzureAsrHelper] 识别结果: \(event.result.text ?? ""), 语言: \(detectedLanguage)")
                    completion(true, event.result.text, detectedLanguage, nil)
                }
            }
            
            recognizer?.addRecognizingEventHandler { [weak self] _, event in
                guard let self = self else { return }
                
                if event.result.reason == .recognizingSpeech {
                    let detectedLanguage = self.getDetectedLanguage(from: event.result)
                    // print("[AzureAsrHelper] 识别中: \(event.result.text ?? ""), 语言: \(detectedLanguage)")
                }
            }
            
            // 添加会话事件处理
            recognizer?.addSessionStartedEventHandler { _, _ in
                print("[AzureAsrHelper] 识别会话已开始")
            }
            
            recognizer?.addSessionStoppedEventHandler { _, _ in
                print("[AzureAsrHelper] 识别会话已结束")
            }
            
            // 添加取消事件处理
            recognizer?.addCanceledEventHandler { _, event in
                if let cancellationDetails = try? SPXCancellationDetails(fromCanceledRecognitionResult: event.result) {
                    let errorDetails = cancellationDetails.errorDetails ?? "未知错误"
                    print("[AzureAsrHelper] 识别取消: \(errorDetails)")
                    completion(false, nil, nil, "识别取消: \(errorDetails)")
                }
            }
            
            // 执行识别
            let result = try recognizer?.recognizeOnceAsync().get()
            
            if result?.reason != .recognizedSpeech {
                completion(false, nil, nil, "未能识别语音")
            }
        } catch {
            completion(false, nil, nil, "识别异常: \(error.localizedDescription)")
        }
    }
    
    /// 重置识别器
    ///
    /// - Returns: 是否重置成功
    private func resetRecognizer() -> Bool {
        if !initialized {
            print("[AzureAsrHelper] 错误: 语音服务未初始化")
            return false
        }
        
        // 检查配置是否为空
        if subscriptionKey.isEmpty || serviceRegion.isEmpty {
            print("[AzureAsrHelper] 错误: Azure 配置信息不完整")
            return false
        }
        
        do {
            // 释放之前的 recognizer
            recognizer = nil
            
            // 创建音频配置 - 使用默认麦克风
            audioConfig = SPXAudioConfig.default()
            
            // 重新创建识别器
            if isAutoDetectLanguage {
                let autoDetectConfig = try SPXAutoDetectSourceLanguageConfiguration(sourceLanguages: supportedLanguages)
                recognizer = try SPXSpeechRecognizer(speechConfiguration: speechConfig!, autoDetectSourceLanguageConfiguration: autoDetectConfig, audioConfiguration: audioConfig!)
            } else {
                recognizer = try SPXSpeechRecognizer(speechConfiguration: speechConfig!, audioConfiguration: audioConfig!)
            }
            
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 重置识别器失败: \(error.localizedDescription)")
            return false
        }
    }
    
    /// 获取检测到的语言
    ///
    /// - Parameter result: 识别结果
    /// - Returns: 检测到的语言代码
    private func getDetectedLanguage(from result: SPXSpeechRecognitionResult) -> String {
        if isAutoDetectLanguage {
            do {
                if let autoDetectResult = try SPXAutoDetectSourceLanguageResult(fromRecognitionResult: result) {
                    return autoDetectResult.language
                }
                return ""
            } catch {
                print("[AzureAsrHelper] 错误: 获取检测到的语言失败: \(error.localizedDescription)")
                return ""
            }
        } else {
            return currentLanguage
        }
    }
    
    /// 开始连续语音识别
    ///
    /// - Returns: 是否成功启动连续识别
    func startContinuousRecognition() -> Bool {
        if !initialized {
            print("[AzureAsrHelper] 错误: 语音服务未初始化")
            return false
        }
        
        // 检查配置是否为空
        if subscriptionKey.isEmpty || serviceRegion.isEmpty {
            print("[AzureAsrHelper] 错误: Azure 配置信息不完整")
            return false
        }
        
        // 如果已经在进行连续识别，直接返回
        if isContinuousRecognitionActive {
            print("[AzureAsrHelper] 已经在进行连续识别中，忽略请求")
            return true
        }
        
        // 重置 recognizer
        if !resetRecognizer() {
            print("[AzureAsrHelper] 尝试重新创建识别器...")
            return false
        }
        
        do {
            // 激活音频会话
            try audioSession.setActive(true)
            
            // 添加识别事件处理
            recognizer?.addRecognizedEventHandler { [weak self] _, event in
                guard let self = self else { return }
                
                if event.result.reason == .recognizedSpeech {
                    let detectedLanguage = self.getDetectedLanguage(from: event.result)
                    let eventData: [String: Any] = [
                        "eventType": "finalResult",
                        "text": event.result.text ?? "",
                        "language": detectedLanguage
                    ]
                    self.eventHandler?(eventData)
                }
            }
            
            // 识别中事件
            recognizer?.addRecognizingEventHandler { [weak self] _, event in
                guard let self = self else { return }
                
                if event.result.reason == .recognizingSpeech {
                    let detectedLanguage = self.getDetectedLanguage(from: event.result)
                    let eventData: [String: Any] = [
                        "eventType": "recognizing",
                        "text": event.result.text ?? "",
                        "language": detectedLanguage
                    ]
                    self.eventHandler?(eventData)
                }
            }
            
            // 会话事件
            recognizer?.addSessionStartedEventHandler { [weak self] _, _ in
                guard let self = self else { return }
                
                let eventData: [String: Any] = [
                    "eventType": "sessionStarted"
                ]
                self.eventHandler?(eventData)
            }
            
            recognizer?.addSessionStoppedEventHandler { [weak self] _, _ in
                guard let self = self else { return }
                
                self.isContinuousRecognitionActive = false
                let eventData: [String: Any] = [
                    "eventType": "sessionStopped"
                ]
                self.eventHandler?(eventData)
            }
            
            // 取消事件
            recognizer?.addCanceledEventHandler { [weak self] _, event in
                guard let self = self else { return }
                
                self.isContinuousRecognitionActive = false
                var errorMessage = "未知错误"
                
                if let cancellationDetails = try? SPXCancellationDetails(fromCanceledRecognitionResult: event.result) {
                    errorMessage = cancellationDetails.errorDetails ?? "未知错误"
                }
                
                let eventData: [String: Any] = [
                    "eventType": "error",
                    "error": "识别取消: \(errorMessage)"
                ]
                self.eventHandler?(eventData)
            }
            
            // 开始连续识别
            try recognizer?.startContinuousRecognition()
            isContinuousRecognitionActive = true
            print("[AzureAsrHelper] 连续识别已启动")
            
            return true
        } catch {
            print("[AzureAsrHelper] 错误: 开始连续识别失败: \(error.localizedDescription)")
            return false
        }
    }
    
    /// 停止连续语音识别
    ///
    /// - Returns: 是否成功停止连续识别
    func stopContinuousRecognition() -> Bool {
        if !initialized {
            print("[AzureAsrHelper] 错误: 语音服务未初始化")
            return false
        }
        
        if !isContinuousRecognitionActive {
            print("[AzureAsrHelper] 未进行连续识别，忽略停止请求")
            return true
        }
        
        do {
            print("[AzureAsrHelper] 停止连续语音识别")
            
            if recognizer == nil {
                if isContinuousRecognitionActive {
                    print("[AzureAsrHelper] 警告: 识别器为空，但状态显示活跃")
                }
                isContinuousRecognitionActive = false
                
                // 通知停止成功
                let eventData: [String: Any] = [
                    "eventType": "success",
                    "message": "连续识别已停止"
                ]
                eventHandler?(eventData)
                return true
            }
            
            // 停止连续识别
            try recognizer?.stopContinuousRecognition()
            
            // 延迟一点时间确保处理完成
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
                guard let self = self else { return }
                
                // 重置状态
                self.isContinuousRecognitionActive = false
                
                // 恢复音频会话
                do {
                    try self.audioSession.setActive(false, options: .notifyOthersOnDeactivation)
                } catch {
                    // 忽略错误
                }
                
                print("[AzureAsrHelper] 连续识别已停止")
                
                // 通知停止成功
                let eventData: [String: Any] = [
                    "eventType": "success",
                    "message": "连续识别已停止"
                ]
                self.eventHandler?(eventData)
            }
            
            return true
        } catch {
            // 强制重置状态
            isContinuousRecognitionActive = false
            print("[AzureAsrHelper] 警告: 停止连续识别失败: \(error.localizedDescription)")
            
            // 通知停止失败，但仍然视为处理完成
            let eventData: [String: Any] = [
                "eventType": "success",
                "message": "连续识别已停止（但有错误）"
            ]
            eventHandler?(eventData)
            
            return false
        }
    }
    
    /// 释放资源
    func dispose() {
        // 如果正在进行连续识别，先停止
        if isContinuousRecognitionActive {
            _ = stopContinuousRecognition()
        }
        
        // 恢复音频会话
        do {
            try audioSession.setActive(false, options: .notifyOthersOnDeactivation)
        } catch {
            // 忽略错误
        }
        
        // 释放资源
        recognizer = nil
        speechConfig = nil
        audioConfig = nil
        
        initialized = false
        isContinuousRecognitionActive = false
        print("[AzureAsrHelper] 资源已释放")
    }
    
    /// 检查连续识别是否处于活跃状态
    ///
    /// - Returns: 是否正在进行连续识别
    func isContinuousRecognitionActive() -> Bool {
        return isContinuousRecognitionActive
    }
}