// Хакатон Казахтелеком — демо-логика (localStorage, без сервера)

const SEED_PARTICIPANTS = [
  { id: "p1", name: "Айгерим Нурлан", email: "aigerim.nur@example.kz", phone: "+7 777 145 20 18", city: "Астана", direction: "Frontend", team: "solo" },
  { id: "p2", name: "Дмитрий Козлов", email: "d.kozlov@example.com", phone: "+7 701 233 90 41", city: "Алматы", direction: "Backend", team: "team" },
  { id: "p3", name: "Жанара Сәтбаева", email: "janara.sat@example.kz", phone: "+7 747 882 15 07", city: "Караганда", direction: "Data Science", team: "solo" },
  { id: "p4", name: "Ержан Алиев", email: "yerzhan.aliev@example.kz", phone: "+7 705 641 33 82", city: "Астана", direction: "Frontend", team: "team" },
  { id: "p5", name: "Марат Суюнбеков", email: "m.suyunbekov@example.kz", phone: "+7 708 402 77 51", city: "Алматы", direction: "Backend", team: "solo" },
  { id: "p6", name: "Айлин Керимова", email: "ailin.kerimova@example.kz", phone: "+7 745 918 26 44", city: "Астана", direction: "Data Science", team: "team" },
  { id: "p7", name: "Тимур Оспанов", email: "t.ospanov@example.kz", phone: "+7 702 550 19 73", city: "Шымкент", direction: "Frontend", team: "solo" }
];

function loadParticipants() {
  try {
    const raw = localStorage.getItem("kt_hackathon_v1");
    const arr = raw ? JSON.parse(raw) : null;
    if (Array.isArray(arr) && arr.length) return arr;
  } catch (e) { /* повреждённые данные — пересеваем */ }
  localStorage.setItem("kt_hackathon_v1", JSON.stringify(SEED_PARTICIPANTS));
  return SEED_PARTICIPANTS.slice();
}

function saveParticipants(list) {
  localStorage.setItem("kt_hackathon_v1", JSON.stringify(list));
}

function esc(s) {
  return String(s).replace(/[&<>"']/g, c => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
}

const DIR_LABELS = { "Frontend": "Frontend", "Backend": "Backend", "Data Science": "Data Science" };
const DIR_CLASS = { "Frontend": "frontend", "Backend": "backend", "Data Science": "data" };

/* ================= Главный экран: статистика ================= */

function renderStats() {
  const el = document.getElementById("stats");
  if (!el) return;
  const total = loadParticipants().length;
  const items = [
    { icon: "calendar", value: "28.09.2026", label: "Дата проведения", hint: "суббота" },
    { icon: "clock", value: "10:00", label: "Начало", hint: "длительность 5 часов" },
    { icon: "building", value: "ул. Сауран, 12", label: "Место проведения", hint: "Казахстан" },
    { icon: "users", value: String(total), label: "Участников", hint: "регистрация открыта" }
  ];
  el.innerHTML = items.map(k =>
    '<div class="kt-ai-kpi">' +
    '<span class="value">' + esc(k.value) + '</span>' +
    '<span class="label">' + esc(k.label) + '</span>' +
    '<span class="hint">' + esc(k.hint) + '</span>' +
    '</div>'
  ).join("");
}

/* ================= Форма регистрации ================= */

function initRegister() {
  const form = document.getElementById("reg-form");
  if (!form) return;

  function setError(key, msg) {
    const el = form.querySelector('[data-err="' + key + '"]');
    if (el) el.textContent = msg || "";
  }

  form.addEventListener("submit", function (ev) {
    ev.preventDefault();
    const data = {
      name: document.getElementById("f-name").value.trim(),
      email: document.getElementById("f-email").value.trim(),
      phone: document.getElementById("f-phone").value.trim(),
      city: document.getElementById("f-city").value.trim() || "—",
      direction: document.getElementById("f-dir").value,
      team: document.getElementById("f-team").value,
      consent: document.getElementById("f-consent").checked
    };

    const errors = {};
    if (data.name.length < 5) errors.name = "Укажите фамилию и имя полностью";
    if (!/^[^@\s]+@[^@\s]+\.[^@\s]+$/.test(data.email)) errors.email = "Укажите корректный email";
    if (!/^[+\d][\d\s()-]{9,}$/.test(data.phone)) errors.phone = "Укажите телефон, например +7 700 555 12 34";
    if (!data.direction) errors.dir = "Выберите направление";
    if (!data.team) errors.team = "Выберите формат участия";
    if (!data.consent) errors.consent = "Без согласия мы не можем отправить подтверждение";

    Object.keys({ name: 1, email: 1, phone: 1, dir: 1, team: 1, consent: 1 }).forEach(k => setError(k, errors[k]));
    if (Object.keys(errors).length) return;

    const list = loadParticipants();
    if (!list.some(p => p.email.toLowerCase() === data.email.toLowerCase())) {
      list.unshift({
        id: "r" + Date.now(),
        name: data.name,
        email: data.email,
        phone: data.phone,
        city: data.city,
        direction: data.direction,
        team: data.team
      });
      saveParticipants(list);
    }

    const succ = document.getElementById("reg-succ");
    document.getElementById("reg-succ-text").textContent =
      "Подтверждение отправим на " + data.email + " накануне мероприятия.";
    form.hidden = true;
    succ.hidden = false;
    succ.scrollIntoView({ behavior: "smooth", block: "center" });
  });
}

/* ================= Список участников ================= */

let partState = { q: "", dir: "all" };

function initParticipants() {
  const tbody = document.getElementById("part-tbody");
  if (!tbody) return;

  const searchField = document.getElementById("p-search");
  const chips = document.getElementById("dir-chips");
  const empty = document.getElementById("part-empty");
  const strip = document.getElementById("kpi-strip");

  function kpiHtml(v, l, h) {
    return '<div class="kt-ai-kpi"><span class="value">' + esc(v) + '</span><span class="label">' + esc(l) + '</span><span class="hint">' + esc(h) + '</span></div>';
  }

  function render() {
    const all = loadParticipants();

    // KPI: считаются по текущему фильтру направления
    const base = partState.dir === "all" ? all : all.filter(p => p.direction === partState.dir);
    const total = base.length;
    const solo = base.filter(p => p.team === "solo").length;
    const cities = new Set(base.map(p => p.city)).size;
    strip.innerHTML =
      kpiHtml(String(total), "Участников", partState.dir === "all" ? "всего" : "по направлению") +
      kpiHtml(String(solo), "Индивидуально", "остальные — с командами") +
      kpiHtml(String(cities), "Городов", "представлены");

    // чипы направлений
    const dirs = ["all", "Frontend", "Backend", "Data Science"];
    chips.innerHTML = dirs.map(d => {
      const active = partState.dir === d;
      const n = d === "all" ? all.length : all.filter(p => p.direction === d).length;
      const label = d === "all" ? "Все" : DIR_LABELS[d];
      return '<button type="button" class="kt-ai-chip ds-dir-chip" data-dir="' + d + '"' +
        (active ? ' data-active="true"' : '') + '>' + esc(label) + ' · ' + n + '</button>';
    }).join("");

    // строки
    const q = partState.q.toLowerCase();
    const rows = all.filter(p =>
      (partState.dir === "all" || p.direction === partState.dir) &&
      (!q || p.name.toLowerCase().includes(q) || p.city.toLowerCase().includes(q) || p.email.toLowerCase().includes(q))
    );

    tbody.innerHTML = rows.map(p =>
      "<tr>" +
      "<td><span class=\"ds-p-name\">" + esc(p.name) + '</span><span class="ds-p-email">' + esc(p.email) + "</span></td>" +
      "<td>" + esc(p.city) + "</td>" +
      '<td><span class="ds-chip ' + (DIR_CLASS[p.direction] || "") + '">' + esc(DIR_LABELS[p.direction] || p.direction) + "</span></td>" +
      '<td class="ds-p-count">' + (p.team === "team" ? "команда" : "соло") + "</td>" +
      "</tr>"
    ).join("");

    empty.hidden = rows.length > 0;
  }

  chips.addEventListener("click", ev => {
    const btn = ev.target.closest("[data-dir]");
    if (!btn) return;
    partState.dir = btn.getAttribute("data-dir");
    render();
  });

  searchField.addEventListener("input", () => {
    partState.q = searchField.value.trim();
    render();
  });

  render();
}

/* ================= Старт ================= */

function init() {
  if (document.getElementById("reg-form")) {
    if (new URLSearchParams(location.search).has("registered")) {
      const succ = document.getElementById("reg-succ");
      const form = document.getElementById("reg-form");
      document.getElementById("reg-succ-text").textContent = "Подтверждение отправим на почту накануне мероприятия.";
      form.hidden = true;
      succ.hidden = false;
    }
  }
  renderStats();
  initRegister();
  initParticipants();
}

document.addEventListener("DOMContentLoaded", init);