src/utils/Logger.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

enum LogLevel {
  DEBUG = 0,
  INFO = 1,
  WARN = 2,
  ERROR = 3,
}

class Logger {
  private level: LogLevel;

  constructor() {
    // Allow configuration via environment variable
    const envLevel = process.env.LOG_LEVEL?.toUpperCase();
    this.level = envLevel && envLevel in LogLevel 
      ? LogLevel[envLevel as keyof typeof LogLevel] 
      : LogLevel.INFO;
  }

  setLevel(level: LogLevel) {
    this.level = level;
  }

  debug(message: string, ...args: unknown[]) {
    if (this.level <= LogLevel.DEBUG) {
      console.log(`[DEBUG] ${message}`, ...args);
    }
  }

  info(message: string, ...args: unknown[]) {
    if (this.level <= LogLevel.INFO) {
      console.log(`[INFO] ${message}`, ...args);
    }
  }

  warn(message: string, ...args: unknown[]) {
    if (this.level <= LogLevel.WARN) {
      console.warn(`[WARN] ${message}`, ...args);
    }
  }

  error(message: string, ...args: unknown[]) {
    if (this.level <= LogLevel.ERROR) {
      console.error(`[ERROR] ${message}`, ...args);
    }
  }
}

export const logger = new Logger();
export { LogLevel };