mock-server.js

import express, { json } from "express";
import cors from "cors";

const app = express();
const PORT = 4000;

app.use(cors());
app.use(json());

app.get("/api/users", (req, res) => {
  const requestedPage = parseInt(req.query.pageNumber);
  const requestedPageSize = parseInt(req.query.pageSize);
  const pageNumber = isNaN(requestedPage) ? 1 : requestedPage;
  const pageSize = isNaN(requestedPageSize) ? 10 : requestedPageSize;

  if (pageNumber < 1 || pageSize < 1) {
    return res.status(400).json({
      error:
        "Invalid pagination parameters: pageNumber and pageSize must be >= 1.",
    });
  }

  const totalElements = 200;
  const totalPages = Math.ceil(totalElements / pageSize);

  const startIndex = (pageNumber - 1) * pageSize;
  const endIndex = Math.min(startIndex + pageSize, totalElements);

  const users = Array.from({ length: endIndex - startIndex }, (_, i) => {
    const id = startIndex + i + 1;

    return {
      id: id,
      firstName: `User ${id}`,
      lastName: `Lastname ${id}`,
    };
  });

  res.json({
    pageNumber,
    pageSize,
    totalElements,
    totalPages,
    content: users,
  });
});

app.listen(PORT, () => {
  console.log(`Mock server running at http://localhost:${PORT}`);
});