import { Injectable, Logger } from '@nestjs/common';

/**
 * LogService - Service for application logging with structured formatting
 *
 * This service provides a centralized logging interface that can be used
 * throughout the application. It currently wraps console.log but is designed
 * to be extended with more sophisticated logging capabilities.
 *
 * Benefits of using LogService instead of direct console.log:
 * - Centralized logging configuration
 * - Easy to switch logging implementations (Winston, Pino, etc.)
 * - Consistent log formatting across application
 * - Future-proofing for logging infrastructure changes
 * - Potential for log filtering, redaction, and enrichment
 *
 * @example
 * // Basic logging
 * logService.log('User logged in', { userId: 123, timestamp: new Date() });
 *
 * @example
 * // With multiple arguments
 * logService.log('Error occurred', error, 'in module', moduleName);
 *
 * @note Consider using NestJS built-in Logger for production applications
 * @note This minimal implementation should be enhanced for production use
 */
@Injectable()
export class LogService {
  // Optional: Use NestJS's built-in Logger for better integration
  // private readonly logger = new Logger(LogService.name);

  /**
   * Logs messages and data to the console
   *
   * Provides a simple logging interface that can be replaced with
   * more sophisticated logging solutions without changing calling code.
   *
   * @param args - Any number of arguments to log
   *
   * @note In production, consider:
   *       - Log levels (info, warn, error, debug)
   *       - Structured JSON logging
   *       - Log aggregation services
   *       - Performance considerations for high-volume logging
   */
  log(...args: any[]): void {
    // Simple console.log wrapper
    console.log(...args);

    // Alternative: Use NestJS Logger with timestamp and context
    // this.logger.log(args.join(' '));
  }

  /**
   * Enhanced logging methods that could be added:
   *
   * error(...args: any[]): void {
   *   console.error(...args);
   *   // or: this.logger.error(args.join(' '));
   * }
   *
   * warn(...args: any[]): void {
   *   console.warn(...args);
   *   // or: this.logger.warn(args.join(' '));
   * }
   *
   * debug(...args: any[]): void {
   *   console.debug(...args);
   *   // or: this.logger.debug(args.join(' '));
   * }
   *
   * info(...args: any[]): void {
   *   console.info(...args);
   *   // or: this.logger.log(args.join(' '));
   * }
   */

  /**
   * Structured logging method (recommended for production):
   *
   * logStructured(level: LogLevel, message: string, metadata: Record<string, any>): void {
   *   const logEntry = {
   *     timestamp: new Date().toISOString(),
   *     level,
   *     message,
   *     ...metadata
   *   };
   *
   *   console.log(JSON.stringify(logEntry));
   * }
   */
}
