import { Injectable, NestMiddleware, Logger } from "@nestjs/common";
import { Request, Response, NextFunction } from "express";
import { MetricsService } from "./metrics.service";

@Injectable()
export class RequestLoggerMiddleware implements NestMiddleware {
  private readonly logger = new Logger(RequestLoggerMiddleware.name);

  constructor(private readonly metricsService: MetricsService) {}

  use(req: Request, res: Response, next: NextFunction) {
    const start = Date.now();
    const { method, originalUrl } = req;
    res.on("finish", () => {
      const responseTime = Date.now() - start;
      const statusCode = res.statusCode;
      this.metricsService.recordRequest(
        method,
        originalUrl,
        statusCode,
        responseTime,
      );
      this.logger.debug(
        `${method} ${originalUrl} ${statusCode} ${responseTime}ms`,
      );
    });

    next();
  }
}