/* ---- 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 only block you edit
   ============================================================ */
const CONFIG = {
  teamId:   "2iGDVMgX0a",
  leagueId: "BYaaUfKum7z0",
  regionId: "VgQKgqmTPU",

  // Fallback roster if the team endpoint requires auth.
  memberIds: [],

  // Flip to true to preview the layout with placeholder rows (no network).
  useSample: false,
};

const API = "https://newprod-api.bestcoastpairings.com/v1";
const HEADERS = { "client-id": "web-app", "env": "bcp", "accept": "application/json" };
const CACHE_KEY = "gg_board_v3";

const $ = (id) => document.getElementById(id);
const fmtPts = (n) => Number(n || 0).toLocaleString(undefined, { minimumFractionDigits: 1, maximumFractionDigits: 1 });
const fmtWpct = (w, l, t) => { const g = (+w||0)+(+l||0)+(+t||0); return g ? ((+w||0)/g*100).toFixed(1)+'%' : '—'; };
const fullName = (u = {}) => [u.firstName, u.lastName].filter(Boolean).join(" ").trim();

/* ---- ELO data ---- */
let eloData = null;

async function loadElo() {
  try {
    const r = await fetch('/elo-data.json');
    if (!r.ok) return;
    const d = await r.json();
    if (d && d.byName && d.count > 0) {
      eloData = d;
      if (lastState) render(lastState);
    }
  } catch (e) { /* ELO is optional — fail silently */ }
}

function lookupElo(r) {
  if (!eloData) return null;
  const name = fullName(r.user || {}).toLowerCase().trim();
  if (eloData.byName[name]) return eloData.byName[name];
  // Fall back to first + last only (strips middle initials)
  const parts = name.split(/\s+/).filter(Boolean);
  if (parts.length > 2) {
    const short = parts[0] + ' ' + parts[parts.length - 1];
    if (eloData.byName[short]) return eloData.byName[short];
  }
  return null;
}

/* ---- Sort state ---- */
let sortState = { col: 'pts', dir: 'desc' };
let lastState = null;

const sortCols = {
  pts:  { key: r => +(r.ITCPoints || 0),                                                               defaultDir: 'desc' },
  name: { key: r => fullName(r.user || {}).toLowerCase() || '',                                        defaultDir: 'asc'  },
  wlt:  { key: r => (+r.wins||0) * 10000 - (+r.losses||0) * 100 - (+r.ties||0),                      defaultDir: 'desc' },
  wpct: { key: r => { const g=(+r.wins||0)+(+r.losses||0)+(+r.ties||0); return g?(+r.wins||0)/g:-1; }, defaultDir: 'desc' },
  rank: { key: r => +(r.placing || Infinity),                                                           defaultDir: 'asc'  },
  elo:  { key: r => { const e = lookupElo(r); return e ? e.rank : Infinity; },                         defaultDir: 'asc'  },
};

function applySort(rows) {
  const { col, dir } = sortState;
  const sc = sortCols[col] || sortCols.pts;
  return [...rows].sort((a, b) => {
    const av = sc.key(a), bv = sc.key(b);
    if (typeof av === 'string') return dir === 'asc' ? av.localeCompare(bv) : bv.localeCompare(av);
    return dir === 'asc' ? av - bv : bv - av;
  });
}

function updateSortHeaders() {
  document.querySelectorAll('th[data-sort]').forEach(th => {
    const arrow = th.querySelector('.sort-arrow');
    if (arrow) arrow.textContent = th.dataset.sort === sortState.col ? (sortState.dir === 'asc' ? ' ▲' : ' ▼') : '';
  });
}

function initSortHeaders() {
  document.querySelectorAll('th[data-sort]').forEach(th => {
    const arrow = document.createElement('span');
    arrow.className = 'sort-arrow text-xs opacity-60';
    th.appendChild(arrow);
    th.addEventListener('click', () => {
      const col = th.dataset.sort;
      if (sortState.col === col) {
        sortState.dir = sortState.dir === 'asc' ? 'desc' : 'asc';
      } else {
        sortState.col = col;
        sortState.dir = (sortCols[col] || sortCols.pts).defaultDir;
      }
      updateSortHeaders();
      if (lastState) render(lastState);
    });
  });
  updateSortHeaders();
}

/* ---- Roster ---- */
async function getMemberIds(force) {
  try {
    const r = await fetch(`${API}/teams/${CONFIG.teamId}?expand[]=owner`,
      { headers: HEADERS, credentials: "omit" });
    if (!r.ok) throw new Error("auth/" + r.status);
    let t = await r.json(); if (Array.isArray(t)) t = t[0] || {};
    const ids = new Set();
    if (Array.isArray(t.memberIds)) t.memberIds.forEach(x => typeof x === "string" && ids.add(x));
    if (typeof t.ownerId === "string") ids.add(t.ownerId);
    [t.users, t.members, t.teamMembers].forEach(list => {
      if (Array.isArray(list)) list.forEach(o => o && o.id && ids.add(o.id));
    });
    if (t.owner && t.owner.id) ids.add(t.owner.id);
    if (ids.size) return { ids, live: true };
    throw new Error("empty");
  } catch (e) {
    if (CONFIG.memberIds.length) return { ids: new Set(CONFIG.memberIds), live: false };
    throw e;
  }
}

/* ---- Standings (cursor-paginated, circular-cursor safe) ---- */
async function* streamPlacings() {
  const base = `${API}/placings?placingsType=player&leagueId=${CONFIG.leagueId}` +
    `&regionId=${CONFIG.regionId}&sortAscending=false&limit=1000`;

  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("placings/" + r.status);
    const p = await r.json();
    const page = Array.isArray(p) ? p : (p.data || p.placings || []);

    yield page;

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

    // BCP returns the same cursor when there are no more results — stop when it loops
    if (nextKey === prevNextKey) break;
    prevNextKey = nextKey;
  } while (nextKey);
}

/* ---- Build leaderboard ---- */
function build(rows, ids) {
  const kept = [];
  for (const rec of rows) {
    const uid = rec.userId || (rec.user && rec.user.id);
    if (uid && ids.has(uid)) kept.push(rec);
  }
  kept.sort((a, b) => Number(b.ITCPoints || 0) - Number(a.ITCPoints || 0));
  return kept;
}

/* ---- Render ---- */
function render(state) {
  lastState = state;
  const { kept, rosterSize, updated, live, fromCache } = state;

  $("dot").className = "w-2 h-2 rounded-full bg-success animate-pulse transition-colors";
  $("updated").textContent = (fromCache ? "Cached " : "Updated ") +
    new Date(updated).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
  $("meta").textContent = `${kept.length} of ${rosterSize} members placed` + (live ? "" : " · roster (cached)");

  $("banner").className = "alert mb-4 hidden";

  const champ = $("champion"), strip = $("strip"), empty = $("empty"), tb = $("rows");
  tb.innerHTML = "";

  if (!kept.length) {
    champ.classList.add("hidden"); strip.hidden = true;
    empty.classList.remove("hidden");
    empty.textContent = "No Gateway Gamers players found in this league's standings yet. " +
      "Once members log games here, they'll appear ranked by ITC points.";
    return;
  }
  empty.classList.add("hidden"); strip.hidden = false;

  // Champion card
  const top = kept[0], tu = top.user || {};
  champ.classList.remove("hidden");
  $("champ-name").textContent = fullName(tu) || tu.nickname || "—";
  $("champ-sub").textContent = `${fmtWpct(top.wins, top.losses, top.ties)} Win Rate · ITC #${top.placing ?? "—"}`;
  $("champ-pts").textContent = fmtPts(top.ITCPoints);

  // Stat strip
  const W = kept.reduce((s, r) => s + (+r.wins || 0), 0),
    L = kept.reduce((s, r) => s + (+r.losses || 0), 0),
    T = kept.reduce((s, r) => s + (+r.ties || 0), 0),
    best = Math.min(...kept.map(r => +r.placing || Infinity));
  $("s-placed").textContent = kept.length;
  $("s-top").textContent = fmtPts(top.ITCPoints);
  $("s-rec").textContent = fmtWpct(W, L, T);
  $("s-best").textContent = isFinite(best) ? ("#" + best) : "—";

  // Rows
  applySort(kept).forEach((r, i) => {
    const u = r.user || {}, name = fullName(u) || u.nickname || "Unknown";
    const tr = document.createElement("tr");
    tr.innerHTML =
      `<td class="font-mono text-base-content/60">${i === 0 ? `<strong class="text-base-content">1</strong>` : (i + 1)}</td>` +
      `<td><span class="font-semibold">${esc(name)}</span>` +
        `${u.nickname && fullName(u) ? `<span class="block text-xs text-base-content/40">"${esc(u.nickname)}"</span>` : ""}</td>` +
      `<td class="text-right font-mono font-bold">${fmtPts(r.ITCPoints)}</td>` +
      `<td class="text-right font-mono hidden sm:table-cell">` +
        `<span class="text-success">${r.wins || 0}</span>–<span class="text-error">${r.losses || 0}</span>–${r.ties || 0}</td>` +
      `<td class="text-right font-mono hidden sm:table-cell">${fmtWpct(r.wins, r.losses, r.ties)}</td>` +
      `<td class="text-right font-mono text-base-content/40 hidden sm:table-cell">#${r.placing ?? "—"}</td>` +
      (eloData
        ? (() => { const e = lookupElo(r); return `<td class="text-right font-mono hidden sm:table-cell">${e ? `#${e.rank.toLocaleString()}` : '<span class="opacity-30">—</span>'}</td>`; })()
        : `<td class="text-right font-mono text-base-content/20 hidden sm:table-cell">…</td>`);
    tb.appendChild(tr);
  });
}

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

/* ---- Cache ---- */
function paintCache() {
  try {
    const c = JSON.parse(localStorage.getItem(CACHE_KEY) || "null");
    if (c && c.kept) render({ ...c, fromCache: true });
  } catch (e) {}
}

function saveCache(state) {
  try {
    localStorage.setItem(CACHE_KEY, JSON.stringify({
      kept: state.kept, rosterSize: state.rosterSize, updated: state.updated, live: state.live
    }));
  } catch (e) {}
}

/* ---- Orchestration ---- */
async function load(force) {
  const btn = $("refresh");
  btn.disabled = true;
  $("dot").className = "w-2 h-2 rounded-full bg-base-content/30 transition-colors";
  $("updated").textContent = "Fetching…";
  showSkeleton();
  try {
    if (CONFIG.useSample) { return render({ ...SAMPLE, fromCache: false }); }

    const { ids, live } = await getMemberIds(force);
    const allRows = [];

    for await (const page of streamPlacings()) {
      allRows.push(...page);
      // Render incrementally so results appear as pages arrive
      const kept = build(allRows, ids);
      if (kept.length) render({ kept, rosterSize: ids.size, updated: Date.now(), live, fromCache: false });
    }

    const kept = build(allRows, ids);
    const state = { kept, rosterSize: ids.size, updated: Date.now(), live };
    render({ ...state, fromCache: false });
    saveCache(state);
  } catch (err) {
    failure(err);
  } finally {
    btn.disabled = false;
  }
}

function showSkeleton() {
  const tb = $("rows");
  tb.innerHTML = "";
  for (let i = 0; i < 6; i++) {
    const tr = document.createElement("tr");
    tr.innerHTML =
      `<td><div class="skeleton h-4 w-5"></div></td>` +
      `<td><div class="skeleton h-4 w-3/5"></div></td>` +
      `<td><div class="skeleton h-4 w-12 ml-auto"></div></td>` +
      `<td class="hidden sm:table-cell"><div class="skeleton h-4 w-14 ml-auto"></div></td>` +
      `<td class="hidden sm:table-cell"><div class="skeleton h-4 w-12 ml-auto"></div></td>` +
      `<td class="hidden sm:table-cell"><div class="skeleton h-4 w-10 ml-auto"></div></td>` +
      `<td class="hidden sm:table-cell"><div class="skeleton h-4 w-10 ml-auto"></div></td>`;
    tb.appendChild(tr);
  }
}

function failure(err) {
  $("dot").className = "w-2 h-2 rounded-full bg-base-content/30 transition-colors";
  $("updated").textContent = "Couldn't update";
  $("rows").innerHTML = "";
  $("champion").classList.add("hidden");
  $("strip").hidden = true;
  const b = $("banner");
  const msg = String(err.message || err);
  b.className = "alert alert-error mb-4";
  b.innerHTML = msg.includes("placings")
    ? "Couldn't reach the BCP standings feed. Try refreshing, or open the page directly in a browser."
    : `Something went wrong: <code class="font-mono text-sm ml-1">${esc(msg)}</code>`;
}

/* ---- Sample (preview only; CONFIG.useSample = true) ---- */
const SAMPLE = (() => {
  const mk = (f, l, p, w, ls, t, pl) => ({ user: { firstName: f, lastName: l }, ITCPoints: p, wins: w, losses: ls, ties: t, placing: pl });
  const kept = [
    mk("Eric",   "Darais", 920.7, 19, 4, 0, 453),
    mk("Jordan", "Vance",  812.4, 16, 6, 1, 712),
    mk("Mara",   "Singh",  770.1, 15, 7, 0, 889),
    mk("Devon",  "Cole",   655.9, 12, 8, 2, 1340),
  ];
  return { kept, rosterSize: 8, updated: Date.now(), live: true };
})();

/* ---- Go ---- */
$("refresh").addEventListener("click", () => load(true));
initSortHeaders();
paintCache();
load(false);
loadElo();