import { Request, Response, NextFunction } from "express";

function log(message: string) {
  console.log(`[${new Date().toISOString()}] ${message}`);
}

export function apiLogger(req: Request, res: Response, next: NextFunction) {
  const start = Date.now();
  const path = req.path;
  let capturedJsonResponse: Record<string, any> | undefined = undefined;

  const originalResJson = res.json;
  res.json = function (bodyJson, ...args) {
    capturedJsonResponse = bodyJson;
    return originalResJson.apply(res, [bodyJson, ...args]);
  };

  res.on("finish", () => {
    const duration = Date.now() - start;
    if (path.startsWith("/api")) {
      let logLine = `${req.method} ${path} ${res.statusCode} in ${duration}ms`;
      if (capturedJsonResponse) {
        logLine += ` :: ${JSON.stringify(capturedJsonResponse)}`;
      }
      if (logLine.length > 80) {
        logLine = logLine.slice(0, 79) + "…";
      }
      log(logLine);
    }
  });

  next();
}