export type SttErrorCode =
  | 'NOT_INITIALIZED'
  | 'NOT_JOINED'
  | 'INVALID_CONFIG'
  | 'INVALID_LANGUAGES'
  | 'ALREADY_JOINED'
  | 'NETWORK_ERROR'
  | 'AUTHENTICATION_ERROR'
  | 'PERMISSION_DENIED'
  | 'TIMEOUT'
  | 'UNKNOWN_ERROR'
  | 'APP_ID_REQUIRED'

export class SttError extends Error {
  public readonly code: SttErrorCode
  public readonly timestamp: number
  public readonly details?: Record<string, any>

  constructor(code: SttErrorCode, message: string, details?: Record<string, any>) {
    super(message)
    this.name = 'SttError'
    this.code = code
    this.timestamp = Date.now()
    this.details = details

    // 保持正确的原型链
    Object.setPrototypeOf(this, SttError.prototype)
  }

  static fromError(error: unknown, code: SttErrorCode = 'UNKNOWN_ERROR'): SttError {
    if (error instanceof SttError) {
      return error
    }

    if (error instanceof Error) {
      return new SttError(code, error.message, { originalError: error })
    }

    return new SttError(code, String(error))
  }

  toJSON(): Record<string, any> {
    return {
      name: this.name,
      code: this.code,
      message: this.message,
      timestamp: this.timestamp,
      details: this.details,
      stack: this.stack,
    }
  }

  toString(): string {
    return `[${this.code}] ${this.message}`
  }
}

// 错误处理工具函数
export const createErrorHandler = (emitter?: { emit: (event: string, error: Error) => void }) => {
  return (error: unknown, context?: string): SttError => {
    const sttError = SttError.fromError(error)

    if (context) {
      Object.assign(sttError, {
        details: {
          ...sttError.details,
          context,
        },
      })
    }

    // 如果提供了事件发射器，发送错误事件
    if (emitter) {
      emitter.emit('error', sttError)
    }

    console.error(`[STT SDK Error] ${sttError.toString()}`, sttError.details)

    return sttError
  }
}

// 错误恢复策略
export class ErrorRecovery {
  private maxRetries: number
  private retryDelay: number

  constructor(maxRetries = 3, retryDelay = 1000) {
    this.maxRetries = maxRetries
    this.retryDelay = retryDelay
  }

  async retry<T>(
    operation: () => Promise<T>,
    shouldRetry?: (error: SttError) => boolean
  ): Promise<T> {
    let lastError: SttError = new SttError('UNKNOWN_ERROR', 'Operation failed')

    for (let attempt = 1; attempt <= this.maxRetries; attempt++) {
      try {
        return await operation()
      } catch (error) {
        const sttError = SttError.fromError(error)
        lastError = sttError

        // 检查是否应该重试
        if (shouldRetry && !shouldRetry(sttError)) {
          break
        }

        // 检查是否达到最大重试次数
        if (attempt === this.maxRetries) {
          break
        }

        // 等待一段时间后重试
        await this.delay(this.retryDelay * attempt)
      }
    }

    throw lastError
  }

  private delay(ms: number): Promise<void> {
    return new Promise((resolve) => setTimeout(resolve, ms))
  }
}