const path = require('path');
require('dotenv').config();

const config = {
  // 🌐 服务器配置
  server: {
    port: parseInt(process.env.PORT) || 3000,
    host: process.env.HOST || '0.0.0.0',
    nodeEnv: process.env.NODE_ENV || 'development',
    trustProxy: process.env.TRUST_PROXY === 'true'
  },

  // 🔐 安全配置
  security: {
    jwtSecret: process.env.JWT_SECRET || 'CHANGE-THIS-JWT-SECRET-IN-PRODUCTION',
    adminSessionTimeout: parseInt(process.env.ADMIN_SESSION_TIMEOUT) || 86400000, // 24小时
    apiKeyPrefix: process.env.API_KEY_PREFIX || 'cr_',
    encryptionKey: process.env.ENCRYPTION_KEY || 'CHANGE-THIS-32-CHARACTER-KEY-NOW'
  },

  // 📊 Redis配置
  redis: {
    host: process.env.REDIS_HOST || '127.0.0.1',
    port: parseInt(process.env.REDIS_PORT) || 6379,
    password: process.env.REDIS_PASSWORD || '',
    db: parseInt(process.env.REDIS_DB) || 0,
    connectTimeout: 10000,
    commandTimeout: 5000,
    retryDelayOnFailover: 100,
    maxRetriesPerRequest: 3,
    lazyConnect: true,
    enableTLS: process.env.REDIS_ENABLE_TLS === 'true',
  },

  // 🎯 Claude API配置
  claude: {
    apiUrl: process.env.CLAUDE_API_URL || 'https://api.anthropic.com/v1/messages',
    apiVersion: process.env.CLAUDE_API_VERSION || '2023-06-01',
    betaHeader: process.env.CLAUDE_BETA_HEADER || 'claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,fine-grained-tool-streaming-2025-05-14'
  },

  // ☁️ Bedrock API配置
  bedrock: {
    enabled: process.env.CLAUDE_CODE_USE_BEDROCK === '1',
    defaultRegion: process.env.AWS_REGION || 'us-east-1',
    smallFastModelRegion: process.env.ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION,
    defaultModel: process.env.ANTHROPIC_MODEL || 'us.anthropic.claude-3-7-sonnet-20250219-v1:0',
    smallFastModel: process.env.ANTHROPIC_SMALL_FAST_MODEL || 'us.anthropic.claude-3-5-haiku-20241022-v1:0',
    maxOutputTokens: parseInt(process.env.CLAUDE_CODE_MAX_OUTPUT_TOKENS) || 4096,
    maxThinkingTokens: parseInt(process.env.MAX_THINKING_TOKENS) || 1024,
    enablePromptCaching: process.env.DISABLE_PROMPT_CACHING !== '1'
  },

  // 🌐 代理配置
  proxy: {
    timeout: parseInt(process.env.DEFAULT_PROXY_TIMEOUT) || 30000,
    maxRetries: parseInt(process.env.MAX_PROXY_RETRIES) || 3
  },

  // 📈 使用限制
  limits: {
    defaultTokenLimit: parseInt(process.env.DEFAULT_TOKEN_LIMIT) || 1000000
  },

  // 📝 日志配置
  logging: {
    level: process.env.LOG_LEVEL || 'info',
    dirname: path.join(__dirname, '..', 'logs'),
    maxSize: process.env.LOG_MAX_SIZE || '10m',
    maxFiles: parseInt(process.env.LOG_MAX_FILES) || 5
  },

  // 🔧 系统配置
  system: {
    cleanupInterval: parseInt(process.env.CLEANUP_INTERVAL) || 3600000, // 1小时
    tokenUsageRetention: parseInt(process.env.TOKEN_USAGE_RETENTION) || 2592000000, // 30天
    healthCheckInterval: parseInt(process.env.HEALTH_CHECK_INTERVAL) || 60000, // 1分钟
    timezone: process.env.SYSTEM_TIMEZONE || 'Asia/Shanghai', // 默认UTC+8（中国时区）
    timezoneOffset: parseInt(process.env.TIMEZONE_OFFSET) || 8 // UTC偏移小时数，默认+8
  },

  // 🎨 Web界面配置
  web: {
    title: process.env.WEB_TITLE || 'Claude Relay Service',
    description: process.env.WEB_DESCRIPTION || 'Multi-account Claude API relay service with beautiful management interface',
    logoUrl: process.env.WEB_LOGO_URL || '/assets/logo.png',
    enableCors: process.env.ENABLE_CORS === 'true',
    sessionSecret: process.env.WEB_SESSION_SECRET || 'CHANGE-THIS-SESSION-SECRET'
  },

    // 🔒 客户端限制配置
  clientRestrictions: {
    // 预定义的客户端列表
    predefinedClients: [
      {
        id: 'claude_code',
        name: 'ClaudeCode',
        description: 'Official Claude Code CLI',
        // 匹配 Claude CLI 的 User-Agent
        // 示例: claude-cli/1.0.58 (external, cli)
        userAgentPattern: /^claude-cli\/[\d\.]+\s+\(/i
      },
      {
        id: 'gemini_cli',
        name: 'Gemini-CLI',
        description: 'Gemini Command Line Interface',
        // 匹配 GeminiCLI 的 User-Agent
        // 示例: GeminiCLI/v18.20.8 (darwin; arm64)
        userAgentPattern: /^GeminiCLI\/v?[\d\.]+\s+\(/i
      }
      // 添加自定义客户端示例：
      // {
      //   id: 'custom_client',
      //   name: 'My Custom Client',
      //   description: 'My custom API client',
      //   userAgentPattern: /^MyClient\/[\d\.]+/i
      // }
    ],
    // 是否允许自定义客户端（未来功能）
    allowCustomClients: process.env.ALLOW_CUSTOM_CLIENTS === 'true'
  },

  // 🛠️ 开发配置
  development: {
    debug: process.env.DEBUG === 'true',
    hotReload: process.env.HOT_RELOAD === 'true'
  }
};

module.exports = config;