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 readData() {
  try { return JSON.parse(fs.readFileSync(DATA, "utf8")); } catch (_) { return {}; }
}

function parseBody(req) {
  return new Promise((resolve) => {
    let s = "";
    req.on("data", (c) => (s += c));
    req.on("end", () => { try { resolve(JSON.parse(s || "{}")); } catch (_) { resolve({}); } });
  });
}

function json(res, data, status = 200) {
  res.writeHead(status, { "Content-Type": "application/json", "Access-Control-Allow-Origin": "*" });
  res.end(JSON.stringify(data));
}

const routes = {
  "GET /api/data": (req, res) => {
    const data = readData();
    json(res, { ok: true, data });
  },

  "POST /api/contact": async (req, res) => {
    const { name, phone, service } = await parseBody(req);
    if (!name || !phone) return json(res, { ok: false, error: "Имя и телефон обязательны" }, 400);
    
    console.log(`📞 Заявка: ${name}, ${phone}, ${service || 'Не указано'}`);
    json(res, { ok: true, message: "Заявка отправлена! Мы свяжемся с вами в течение 15 минут." });
  }
};

const mimeTypes = {
  ".html": "text/html; charset=utf-8",
  ".css": "text/css; charset=utf-8",
  ".js": "application/javascript; charset=utf-8",
  ".json": "application/json; charset=utf-8"
};

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

  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
  res.setHeader("Access-Control-Allow-Headers", "Content-Type");

  if (method === "OPTIONS") {
    res.writeHead(204);
    return res.end();
  }

  for (const [route, handler] of Object.entries(routes)) {
    const [m, p] = route.split(" ");
    if (method !== m) continue;
    if (p === url) return handler(req, res);
  }

  let file = url === "/" ? "/index.html" : url;
  const full = path.join(__dirname, file);
  
  if (full.startsWith(__dirname) && fs.existsSync(full) && fs.statSync(full).isFile()) {
    const ext = path.extname(full);
    const type = mimeTypes[ext] || "application/octet-stream";
    res.writeHead(200, { "Content-Type": type });
    return res.end(fs.readFileSync(full));
  }

  res.writeHead(404, { "Content-Type": "text/plain" });
  res.end("Not Found");
}).listen(PORT, () => console.log("Kazakhtelecom site running on port " + PORT));