// File 02_UrlParameters/app.js
const express = require("express");
const app = express();

function printReqSummary(request) {
  console.log(`Handling ${request.method} ${request.originalUrl}`);
}

// GET / -- Show main page
app.get("/", function(request, response) {
  printReqSummary(request);
  response.send(
    `<h1>URL Parameters (and Queries)</h1><ul>
      <li>Show normal message (GET /hello/segment1)</li>
      <li>Show special message (GET /hello/segment1/segment2?age=NUMBER&height=NUMBER)</li>
      <li>  where segment1, segment2 - any valid URL part</li>
      </ul>`
  );
});

// GET /hello/:name -- Show normal message for a named person
app.get("/hello/:name", function(request, response) {
  printReqSummary(request);
  // Grab URL parameters from `request.params` object
  response.send(`<p>Normal message for: ${request.params.name}</p>`);
});

// GET /hello/:name/:surname -- Show special message with plenty of parameters
app.get("/hello/:name/:surname", function(request, response) {
  printReqSummary(request);
  // Grab (optional) URL queries from `request.query` object
  const age = request.query.age !== undefined ? request.query.age : "unknown";
  const height =
    request.query.height !== undefined ? request.query.height : "unknown";
  response.send(
    `<p>Special message for: ${request.params.name} ${request.params.surname}
      (age: ${age} years, height: ${height} cm)</p>`
  );
});

const getRandomInt = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;

app.get("/rand/:name/:surname/", (request, response) => {
  printReqSummary(request);

  const params = [];
  params[0] = [request.query.age !== undefined ? request.query.age : "unknown", "age"];
  params[1] = [request.query.height !== undefined ? request.query.height : "unknown", "height"];
  params[2] = [request.query.weight !== undefined ? request.query.weight : "unknown", "weight"];

  const rand = getRandomInt(0, 2);
  response.send(`<p>Rand parameter: ${params[rand][1]}=${params[rand][0]}</p>`);
});

app.listen(3000);