(function () {
  "use strict";

  var KEY = "kk-comandirovka";
  var DEMO = { days: "5", perdiem: "10000", transport: "15000", hotel: "20000" };
  var IDS = ["days", "perdiem", "transport", "hotel"];

  var inputs = {};
  IDS.forEach(function (id) {
    inputs[id] = document.getElementById(id);
  });

  var els = {
    rPerdiem: document.getElementById("r-perdiem"),
    rTransport: document.getElementById("r-transport"),
    rHotel: document.getElementById("r-hotel"),
    rTotal: document.getElementById("r-total"),
    empty: document.getElementById("empty-state"),
    calcBtn: document.getElementById("calc-btn"),
    resetBtn: document.getElementById("reset-btn")
  };

  function fmt(n) {
    return n.toLocaleString("ru-RU");
  }

  function load() {
    try {
      var raw = localStorage.getItem(KEY);
      if (!raw) return;
      var saved = JSON.parse(raw);
      IDS.forEach(function (id) {
        if (Object.prototype.hasOwnProperty.call(saved, id)) {
          inputs[id].value = saved[id];
        }
      });
    } catch (e) {
      /* повреждённое хранилище — показываем демо-значения */
    }
  }

  function save() {
    var data = {};
    IDS.forEach(function (id) {
      data[id] = inputs[id].value;
    });
    try {
      localStorage.setItem(KEY, JSON.stringify(data));
    } catch (e) {
      /* localStorage недоступен — просто не сохраняем */
    }
  }

  function num(id) {
    var v = parseFloat(inputs[id].value);
    return isFinite(v) && v > 0 ? v : 0;
  }

  function fill(el, value) {
    el.textContent = value;
    el.dataset.long = value.length > 10 ? "true" : "false";
  }

  function recalc() {
    var days = num("days");
    var perdiem = num("perdiem");
    var transport = num("transport");
    var hotel = num("hotel");
    var ok = days > 0 && perdiem > 0 && transport > 0 && hotel > 0;

    fill(els.rPerdiem, ok ? fmt(Math.round(perdiem * days)) + " тг" : "—");
    fill(els.rTransport, ok ? fmt(transport) + " тг" : "—");
    fill(els.rHotel, ok ? fmt(hotel) + " тг" : "—");
    fill(
      els.rTotal,
      ok ? fmt(Math.round(perdiem * days + transport + hotel)) + " тг" : "—"
    );

    els.empty.hidden = ok;
    save();
  }

  els.calcBtn.addEventListener("click", recalc);

  els.resetBtn.addEventListener("click", function () {
    IDS.forEach(function (id) {
      inputs[id].value = DEMO[id];
    });
    recalc();
  });

  load();
  recalc();
})();