const http = require("http");
const fs = require("fs");
const path = require("path");

const form = fs.readFileSync(path.join(__dirname, "public", "form.html"));

http
  .createServer((req, res) => {
    if (req.method === "GET") {
      get(res);
      return;
    }

    if (req.method === "POST") {
      post(req, res);
      return;
    }
    error(405, res);
  })
  .listen(3000);

function get(res) {
  res.writeHead(200, {
    "Content-Type": "text/html",
  });
  res.end(form);
}

function post(req, res) {
  if (req.headers["content-type"] !== "application/json") {
    error(415, res);
    return;
  }

  let input = "";

  req.on("data", (chunk) => {
    input += chunk.toString();
  });

  req.on("end", () => {
    const parsed = JSON.parse(input);

    if (parsed.err) {
      error(400, "Bad Request", res);
      return;
    }

    console.log("Received data: ", parsed);
    res.end('{"data": ' + input + "}");
  });
}

function error(code, res) {
  res.statusCode = code;
  res.end(http.STATUS_CODES[code]);
}