/* ---- Shared: header / footer ---- */
function loadHTML(file, elementId, callback) {
  fetch(file)
    .then(r => r.text())
    .then(html => {
      document.getElementById(elementId).innerHTML = html;
      if (callback) callback();
    })
    .catch(err => console.error('Error loading:', file, err));
}

function highlightActiveNav() {
  const current = location.pathname.split('/').pop() || 'index.html';
  document.querySelectorAll('#header a[href]').forEach(link => {
    if (link.getAttribute('href') === `/${current}`) {
      link.classList.add('active');
    }
  });
}

function startCarousel() {
  const slides = document.querySelectorAll('#hero-carousel .carousel-slide');
  if (!slides.length) return;
  let current = 0;
  slides[current].style.opacity = '1';
  setInterval(() => {
    slides[current].style.opacity = '0';
    current = (current + 1) % slides.length;
    slides[current].style.opacity = '1';
  }, 5000);
}

loadHTML('/header.html', 'header', () => {
  highlightActiveNav();
  startCarousel();
});
loadHTML('/footer.html', 'footer');

/* ============================================================
   CONFIG  —  the circuits shown on the page. Add/remove/edit
   entries here; the page builds one section per circuit.
   `id` is the leagueId from a circuit's BCP calendar URL,
   e.g. bestcoastpairings.com/circuit/<id>/calendar
   ============================================================ */
const CONFIG = {
  circuits: [
    { id: "Teqdr6p0aGvO", name: "Away Games 2025/26 ITC Season" },
    { id: "t5kk3NvGDMXc", name: "National Tabletop League (NTL) 8-Player Circuit" },
    { id: "m4OIU24N0IZO", name: "TEO 2026 Circuit" },
    { id: "cY0LeCAPfyiG", name: "2026 Lord Marshal Conference" },
  ],
};

/* ---- BCP API ---- */
const API = "https://newprod-api.bestcoastpairings.com/v1";
const HEADERS = { "client-id": "web-app", "env": "bcp", "accept": "application/json" };
const BCP_ORIGIN = "https://www.bestcoastpairings.com";

// Cursor-paginated events for a league/circuit, newest-date-first (BCP
// returns the same cursor when there are no more results — stop when it
// loops, same guard as the other sites' streamPlacings).
async function* streamEvents(leagueId) {
  const base = `${API}/events?leagueId=${leagueId}&sortAscending=false&limit=50`;

  let nextKey = null;
  let prevNextKey = undefined;

  do {
    const url = nextKey ? `${base}&nextKey=${encodeURIComponent(nextKey)}` : base;
    const r = await fetch(url, { headers: HEADERS, credentials: "omit" });
    if (!r.ok) throw new Error("events/" + r.status);
    const p = await r.json();
    const page = Array.isArray(p) ? p : (p.data || []);

    yield page;

    const rawKey = p.nextKey;
    nextKey = !rawKey ? null
      : typeof rawKey === "string" ? rawKey
      : btoa(JSON.stringify(rawKey));

    if (nextKey === prevNextKey) break;
    prevNextKey = nextKey;
  } while (nextKey);
}

// Sorted newest-first, so we can stop as soon as we cross into the past
// instead of paging through a circuit's entire history every time.
async function fetchUpcomingEvents(leagueId) {
  const now = Date.now();
  const upcoming = [];
  for await (const page of streamEvents(leagueId)) {
    if (!page.length) break;
    for (const ev of page) {
      const end = Date.parse(ev.eventEndDate || ev.eventDate);
      if (Number.isFinite(end) && end >= now) upcoming.push(ev);
    }
    // Page is sorted by start date descending, so once the oldest (last)
    // event here has already ended, every event on later pages — all with
    // even older start dates — will have ended too. Stop paging.
    const last = page[page.length - 1];
    const lastEnd = Date.parse(last.eventEndDate || last.eventDate);
    if (!Number.isFinite(lastEnd) || lastEnd < now) break;
  }
  return upcoming.reverse(); // soonest first
}

/* ---- Render ---- */
const $ = id => document.getElementById(id);

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

function fmtDateRange(startIso, endIso) {
  const start = new Date(startIso);
  const opts = { weekday: "short", month: "short", day: "numeric", year: "numeric" };
  const startStr = start.toLocaleDateString(undefined, opts);
  if (!endIso) return startStr;
  const end = new Date(endIso);
  if (start.toDateString() === end.toDateString()) return startStr;
  const sameMonth = start.getMonth() === end.getMonth() && start.getFullYear() === end.getFullYear();
  const endStr = sameMonth
    ? end.toLocaleDateString(undefined, { day: "numeric" })
    : end.toLocaleDateString(undefined, opts);
  return `${startStr} – ${endStr}`;
}

function locationOf(ev) {
  const parts = [ev.locationName, ev.city, ev.country].filter(Boolean);
  return parts.length ? parts.join(", ") : (ev.formatted_address || "Location TBD");
}

function eventCard(ev) {
  const capacity = ev.numTickets
    ? `<span class="badge badge-ghost badge-sm">${ev.checkedInPlayers ?? 0}/${ev.numTickets} checked in</span>`
    : "";
  const system = ev.gameSystemName
    ? `<span class="badge badge-outline badge-sm">${esc(ev.gameSystemName)}</span>`
    : "";
  return `
    <a href="${BCP_ORIGIN}/event/${esc(ev.id)}" target="_blank" rel="noopener"
       class="card card-border bg-base-200 hover:border-warning transition-colors">
      <div class="card-body py-4 flex-row items-center justify-between gap-4 flex-wrap">
        <div class="min-w-0">
          <div class="font-semibold truncate">${esc(ev.name)}</div>
          <div class="text-sm opacity-60 mt-1">${esc(locationOf(ev))}</div>
          <div class="flex gap-2 mt-2">${system}${capacity}</div>
        </div>
        <div class="text-right shrink-0">
          <div class="font-mono text-sm text-warning">${fmtDateRange(ev.eventDate, ev.eventEndDate)}</div>
        </div>
      </div>
    </a>`;
}

function circuitSection(circuit, events) {
  const body = events.length
    ? events.map(eventCard).join("")
    : `<p class="text-sm text-base-content/50 py-4">No upcoming events for this circuit.</p>`;
  return `
    <section>
      <h2 class="text-2xl font-bold uppercase tracking-wide mb-3">
        <a href="${BCP_ORIGIN}/circuit/${esc(circuit.id)}/calendar" target="_blank" rel="noopener" class="hover:text-warning">
          ${esc(circuit.name)}
        </a>
      </h2>
      <div class="space-y-3">${body}</div>
    </section>`;
}

/* ---- Orchestration ---- */
async function load() {
  const results = await Promise.all(
    CONFIG.circuits.map(async circuit => {
      try {
        return { circuit, events: await fetchUpcomingEvents(circuit.id) };
      } catch (err) {
        console.error("Failed to load circuit", circuit.id, err);
        return { circuit, events: [], error: true };
      }
    })
  );

  $("loading").classList.add("hidden");
  const container = $("circuits");
  container.classList.remove("hidden");
  container.innerHTML = results.map(({ circuit, events, error }) =>
    error
      ? `<section><h2 class="text-2xl font-bold uppercase tracking-wide mb-3">${esc(circuit.name)}</h2>
           <p class="text-sm text-error py-4">Couldn't load events for this circuit — try refreshing.</p></section>`
      : circuitSection(circuit, events)
  ).join("");
}

load();