// Реестр участников тимбилдинга: GET/POST /api/participants + статика проекта.
const http = require("http");
const fs = require("fs");
const path = require("path");

const PORT = process.env.PORT || 3000;
const DATA = path.join(__dirname, "data.json");

function readItems() {
  try { return JSON.parse(fs.readFileSync(DATA, "utf8")); } catch (_) { return []; }
}
function writeItems(items) {
  fs.writeFileSync(DATA, JSON.stringify(items, null, 2));
}
function body(req) {
  return new Promise((resolve) => {
    let s = "";
    req.on("data", (c) => (s += c));
    req.on("end", () => { try { resolve(JSON.parse(s || "{}")); } catch (_) { resolve({}); } });
  });
}

const MIME = {
  ".html": "text/html", ".css": "text/css", ".js": "application/javascript",
  ".json": "application/json", ".svg": "image/svg+xml", ".png": "image/png"
};

http.createServer(async (req, res) => {
  const url = req.url.split("?")[0];

  if (req.method === "GET" && url === "/api/participants") {
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify(readItems()));
  }
  if (req.method === "POST" && url === "/api/participants") {
    const it = await body(req);
    const items = readItems();
    const rec = {
      id: Date.now(),
      name: String(it.name || "").trim(),
      lastname: String(it.lastname || "").trim(),
      phone: String(it.phone || "").trim(),
      status: "waiting",
      date: it.date || new Date().toISOString().slice(0, 10)
    };
    items.push(rec);
    writeItems(items);
    res.writeHead(201, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ ok: true, record: rec }));
  }

  let file = url === "/" ? "/index.html" : url;
  const full = path.join(__dirname, decodeURIComponent(file));
  if (full.startsWith(__dirname) && fs.existsSync(full) && fs.statSync(full).isFile()) {
    const ext = path.extname(full);
    res.writeHead(200, { "Content-Type": (MIME[ext] || "application/octet-stream") + "; charset=utf-8" });
    return res.end(fs.readFileSync(full));
  }
  res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
  res.end("Not found");
}).listen(PORT, () => console.log("Регистрация тимбилдинга на порту " + PORT));