// debug_logger.ts - 调试日志模块
export enum LogLevel {
  ERROR = 0,
  WARN = 1,
  INFO = 2,
  DEBUG = 3,
  TRACE = 4
}

export interface LogConfig {
  level: LogLevel;
  enableTimestamp: boolean;
  enableColors: boolean;
  enableFileOutput: boolean;
  logFilePath?: string;
  modules: {
    [moduleName: string]: LogLevel;
  };
}

const DEFAULT_CONFIG: LogConfig = {
  level: LogLevel.INFO,
  enableTimestamp: true,
  enableColors: true,
  enableFileOutput: false,
  modules: {}
};

class DebugLogger {
  private config: LogConfig;
  private logFile?: Deno.FsFile;

  constructor(config: Partial<LogConfig> = {}) {
    this.config = { ...DEFAULT_CONFIG, ...config };
    
    if (this.config.enableFileOutput && this.config.logFilePath) {
      this.initLogFile();
    }
  }

  private async initLogFile() {
    try {
      this.logFile = await Deno.open(this.config.logFilePath!, {
        create: true,
        write: true,
        append: true
      });
    } catch (error) {
      console.error(`Failed to open log file: ${error}`);
    }
  }

  private getTimestamp(): string {
    if (!this.config.enableTimestamp) return "";
    return `[${new Date().toISOString()}] `;
  }

  private getColorCode(level: LogLevel): string {
    if (!this.config.enableColors) return "";
    
    switch (level) {
      case LogLevel.ERROR: return "\x1b[31m"; // Red
      case LogLevel.WARN: return "\x1b[33m";  // Yellow
      case LogLevel.INFO: return "\x1b[36m";  // Cyan
      case LogLevel.DEBUG: return "\x1b[32m"; // Green
      case LogLevel.TRACE: return "\x1b[35m"; // Magenta
      default: return "";
    }
  }

  private getResetCode(): string {
    return this.config.enableColors ? "\x1b[0m" : "";
  }

  private getLevelName(level: LogLevel): string {
    switch (level) {
      case LogLevel.ERROR: return "ERROR";
      case LogLevel.WARN: return "WARN ";
      case LogLevel.INFO: return "INFO ";
      case LogLevel.DEBUG: return "DEBUG";
      case LogLevel.TRACE: return "TRACE";
      default: return "UNKNOWN";
    }
  }

  private shouldLog(level: LogLevel, module?: string): boolean {
    // 检查模块特定的日志级别
    if (module && this.config.modules[module] !== undefined) {
      return level <= this.config.modules[module];
    }
    
    // 使用全局日志级别
    return level <= this.config.level;
  }

  private formatMessage(level: LogLevel, module: string, message: string, ...args: any[]): string {
    const timestamp = this.getTimestamp();
    const colorCode = this.getColorCode(level);
    const resetCode = this.getResetCode();
    const levelName = this.getLevelName(level);
    
    const formattedArgs = args.length > 0 ? " " + args.map(arg => 
      typeof arg === 'object' ? JSON.stringify(arg, null, 2) : String(arg)
    ).join(" ") : "";
    
    return `${timestamp}${colorCode}[${levelName}]${resetCode} [${module}] ${message}${formattedArgs}`;
  }

  private async writeLog(formattedMessage: string) {
    // 输出到控制台
    console.log(formattedMessage);
    
    // 输出到文件
    if (this.logFile) {
      try {
        const encoder = new TextEncoder();
        await this.logFile.write(encoder.encode(formattedMessage + "\n"));
        await this.logFile.sync();
      } catch (error) {
        console.error(`Failed to write to log file: ${error}`);
      }
    }
  }

  log(level: LogLevel, module: string, message: string, ...args: any[]) {
    if (!this.shouldLog(level, module)) return;
    
    const formattedMessage = this.formatMessage(level, module, message, ...args);
    this.writeLog(formattedMessage);
  }

  error(module: string, message: string, ...args: any[]) {
    this.log(LogLevel.ERROR, module, message, ...args);
  }

  warn(module: string, message: string, ...args: any[]) {
    this.log(LogLevel.WARN, module, message, ...args);
  }

  info(module: string, message: string, ...args: any[]) {
    this.log(LogLevel.INFO, module, message, ...args);
  }

  debug(module: string, message: string, ...args: any[]) {
    this.log(LogLevel.DEBUG, module, message, ...args);
  }

  trace(module: string, message: string, ...args: any[]) {
    this.log(LogLevel.TRACE, module, message, ...args);
  }

  // 设置模块特定的日志级别
  setModuleLevel(module: string, level: LogLevel) {
    this.config.modules[module] = level;
  }

  // 设置全局日志级别
  setGlobalLevel(level: LogLevel) {
    this.config.level = level;
  }

  // 获取当前配置
  getConfig(): LogConfig {
    return { ...this.config };
  }

  // 关闭日志文件
  async close() {
    if (this.logFile) {
      await this.logFile.close();
    }
  }
}

// 创建全局调试器实例
export const debugLogger = new DebugLogger({
  level: LogLevel.DEBUG,
  enableTimestamp: true,
  enableColors: true,
  enableFileOutput: false,
  logFilePath: "./debug.log",
  modules: {
    "DEVICE_SIMULATOR": LogLevel.ERROR,
    "MODBUS": LogLevel.ERROR,
    "MQTT": LogLevel.ERROR,
    "REGISTER_CONFIG": LogLevel.ERROR,
    "DEVICE_MANAGER": LogLevel.ERROR,
    "SIMULATOR_MAIN": LogLevel.ERROR
  }
});

// 便捷的模块日志器创建函数
export function createModuleLogger(moduleName: string) {
  return {
    error: (message: string, ...args: any[]) => debugLogger.error(moduleName, message, ...args),
    warn: (message: string, ...args: any[]) => debugLogger.warn(moduleName, message, ...args),
    info: (message: string, ...args: any[]) => debugLogger.info(moduleName, message, ...args),
    debug: (message: string, ...args: any[]) => debugLogger.debug(moduleName, message, ...args),
    trace: (message: string, ...args: any[]) => debugLogger.trace(moduleName, message, ...args)
  };
}

// 性能监控工具
export class PerformanceMonitor {
  private timers: Map<string, number> = new Map();
  private logger = createModuleLogger("PERFORMANCE");

  start(label: string) {
    this.timers.set(label, performance.now());
    this.logger.trace(`⏱️ Started timer: ${label}`);
  }

  end(label: string): number {
    const startTime = this.timers.get(label);
    if (!startTime) {
      this.logger.trace(`⚠️ Timer not found: ${label}`);
      return 0;
    }

    const duration = performance.now() - startTime;
    this.timers.delete(label);
    this.logger.trace(`⏱️ ${label}: ${duration.toFixed(2)}ms`);
    return duration;
  }

  measure<T>(label: string, fn: () => T): T {
    this.start(label);
    try {
      const result = fn();
      this.end(label);
      return result;
    } catch (error) {
      this.end(label);
      this.logger.error(`❌ Error in ${label}:`, error);
      throw error;
    }
  }

  async measureAsync<T>(label: string, fn: () => Promise<T>): Promise<T> {
    this.start(label);
    try {
      const result = await fn();
      this.end(label);
      return result;
    } catch (error) {
      this.end(label);
      this.logger.error(`❌ Error in ${label}:`, error);
      throw error;
    }
  }
}

export const perfMonitor = new PerformanceMonitor();

// 内存使用监控
export function logMemoryUsage(module: string) {
  if (typeof Deno !== 'undefined' && Deno.memoryUsage) {
    const memory = Deno.memoryUsage();
    const logger = createModuleLogger(module);
    logger.debug(`💾 Memory usage:`, {
      rss: `${(memory.rss / 1024 / 1024).toFixed(2)}MB`,
      heapTotal: `${(memory.heapTotal / 1024 / 1024).toFixed(2)}MB`,
      heapUsed: `${(memory.heapUsed / 1024 / 1024).toFixed(2)}MB`,
      external: `${(memory.external / 1024 / 1024).toFixed(2)}MB`
    });
  }
}

// 调试配置管理
export function setDebugLevel(level: LogLevel | string, module?: string) {
  const logLevel = typeof level === 'string' ? 
    LogLevel[level.toUpperCase() as keyof typeof LogLevel] : level;
  
  if (module) {
    debugLogger.setModuleLevel(module, logLevel);
    console.log(`🔧 Set debug level for ${module}: ${LogLevel[logLevel]}`);
  } else {
    debugLogger.setGlobalLevel(logLevel);
    console.log(`🔧 Set global debug level: ${LogLevel[logLevel]}`);
  }
}

// 调试工具已在上面导出