/* Courtside Manager — score keeper for one court. Big buttons, one job: keep the running score of
   whatever match is on this court and finalize it. Corrections after that are the organizer's. */
(() => {
  const root = document.getElementById('keeper');
  const court = +root.dataset.court, k = root.dataset.k;
  let state = JSON.parse(document.getElementById('state').textContent);
  const esc = s => String(s ?? '').replace(/[&<>"']/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
  const base = `/keeper/${state.slug}/${court}`;
  const post = (path, body) => fetch(`${base}/${path}`, { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify({ k, ...body }) }).then(async r => { const j = await r.json().catch(() => ({})); if (!r.ok || !j.ok) throw new Error(j.error || r.statusText); return j; });

  // local scoring state for the match currently on this court
  let cur = null;           // { matchId, a, b, sets: [[a,b],...], history: [] }
  let busy = false, note = '', confirming = false;

  function courtMatch() { const c = state.courts.find(c => c.court === court); return c?.match && c.match.status === 'live' ? c.match : null; }

  function syncFromState() {
    const m = courtMatch();
    if (!m) { cur = null; return; }
    if (!cur || cur.matchId !== m.id) {
      cur = { matchId: m.id, a: m.live?.[0] ?? 0, b: m.live?.[1] ?? 0, sets: m.liveSets ? m.liveSets.map(s => [...s]) : [], history: [] };
      confirming = false; note = '';
    }
  }

  const rules = () => state.rules;
  function setOver(a, b) {
    const { pointsTo, winBy, cap } = rules();
    const hi = Math.max(a, b), lo = Math.min(a, b);
    if (cap && hi >= cap && hi > lo) return true;
    return hi >= pointsTo && hi - lo >= winBy;
  }
  const setsNeeded = () => Math.ceil(rules().bestOf / 2);
  const setsWon = side => cur.sets.filter(s => (side === 0 ? s[0] > s[1] : s[1] > s[0])).length;

  function render() {
    syncFromState();
    const c = state.courts.find(c => c.court === court);
    const m = courtMatch();
    const head = `<div class="khead"><span class="kcourt">Court ${court}</span><span class="pill ${state.phase}">${esc(state.name)}</span></div>`;
    if (!m) {
      const next = state.upNext.find(u => u.court === court);
      root.innerHTML = `${head}<div class="kwait"><h1>${c?.status === 'paused' ? 'Court paused' : 'No match on this court'}</h1>
        <p class="muted">${next ? `Next up: <b>${esc(next.a?.name)} vs ${esc(next.b?.name)}</b> (~${next.etaMin} min). This page will switch to it automatically.` : state.phase === 'final' ? 'Tournament is over.' : 'Waiting for the organizer to assign the next match. This page updates on its own.'}</p>
        ${note ? `<p class="knote">${esc(note)}</p>` : ''}</div>`;
      return;
    }
    const r = rules();
    const over = setOver(cur.a, cur.b);
    const matchDone = over && (setsWon(0) + (cur.a > cur.b ? 1 : 0) >= setsNeeded() || setsWon(1) + (cur.b > cur.a ? 1 : 0) >= setsNeeded());
    const setNo = cur.sets.length + 1;
    root.innerHTML = `${head}
      <div class="klbl">${m.stage === 'pool' ? `Pool play · round ${m.round}` : esc(m.label ?? `Bracket round ${m.round}`)} · to ${r.pointsTo}, win by ${r.winBy}${r.cap ? `, cap ${r.cap}` : ''}${r.bestOf > 1 ? ` · best of ${r.bestOf}, set ${setNo}` : ''}</div>
      <div class="kpad">
        <div class="kside ${cur.a > cur.b ? 'lead' : ''}"><div class="kname">${esc(m.a?.name)}</div><div class="kpts mono">${cur.a}</div><button type="button" class="kbtn plus" data-op="a+" ${over ? 'disabled' : ''} aria-label="Point ${esc(m.a?.name)}">+</button><button type="button" class="kbtn minus" data-op="a-" aria-label="Undo point ${esc(m.a?.name)}">−</button></div>
        <div class="kside ${cur.b > cur.a ? 'lead' : ''}"><div class="kname">${esc(m.b?.name)}</div><div class="kpts mono">${cur.b}</div><button type="button" class="kbtn plus" data-op="b+" ${over ? 'disabled' : ''} aria-label="Point ${esc(m.b?.name)}">+</button><button type="button" class="kbtn minus" data-op="b-" aria-label="Undo point ${esc(m.b?.name)}">−</button></div>
      </div>
      ${cur.sets.length ? `<div class="ksets mono">Sets: ${cur.sets.map(s => `${s[0]}–${s[1]}`).join(', ')}</div>` : ''}
      <div class="kactions">
        ${r.bestOf > 1 && over && !matchDone ? `<button type="button" class="primary" data-act="endset">End set ${setNo}</button>` : ''}
        ${over && matchDone && !confirming ? `<button type="button" class="primary big" data-act="finalize">Finalize · ${esc((cur.a > cur.b ? m.a : m.b)?.name)} wins</button>` : ''}
        ${confirming ? `<div class="kconfirm"><p>Final score <b class="mono">${[...cur.sets, [cur.a, cur.b]].map(s => `${s[0]}–${s[1]}`).join(', ')}</b>. Once finalized, only the organizer desk can change it.</p><button type="button" class="primary big" data-act="confirm">Yes, finalize</button> <button type="button" data-act="cancel">Not yet</button></div>` : ''}
        ${!over ? `<p class="muted small">Finalize appears when a side reaches ${r.pointsTo} with a ${r.winBy}-point lead${r.cap ? ` or hits the cap of ${r.cap}` : ''}.</p>` : ''}
        <button type="button" class="small" data-act="undo" ${cur.history.length ? '' : 'disabled'}>Undo last</button>
      </div>
      ${note ? `<p class="knote">${esc(note)}</p>` : ''}`;
  }

  let pushTimer = null;
  function push() {
    clearTimeout(pushTimer);
    pushTimer = setTimeout(() => post('live', { match: cur.matchId, a: cur.a, b: cur.b, sets: cur.sets }).then(() => { note = ''; }).catch(e => { note = e.message; render(); }), 120);
  }
  function point(side, delta) {
    if (!cur) return;
    cur.history.push({ a: cur.a, b: cur.b, sets: cur.sets.map(s => [...s]) });
    if (side === 'a') cur.a = Math.max(0, cur.a + delta); else cur.b = Math.max(0, cur.b + delta);
    confirming = false; try { navigator.vibrate?.(15); } catch {}
    render(); push();
  }

  root.addEventListener('click', e => {
    const op = e.target.closest('[data-op]')?.dataset.op; const act = e.target.closest('[data-act]')?.dataset.act;
    if (op) return point(op[0], op[1] === '+' ? 1 : -1);
    if (!act || !cur) return;
    if (act === 'undo') { const h = cur.history.pop(); if (h) { cur.a = h.a; cur.b = h.b; cur.sets = h.sets; confirming = false; render(); push(); } }
    if (act === 'endset') { cur.history.push({ a: cur.a, b: cur.b, sets: cur.sets.map(s => [...s]) }); cur.sets.push([cur.a, cur.b]); cur.a = 0; cur.b = 0; render(); push(); }
    if (act === 'finalize') { confirming = true; render(); }
    if (act === 'cancel') { confirming = false; render(); }
    if (act === 'confirm') {
      if (busy) return; busy = true;
      const sets = [...cur.sets, [cur.a, cur.b]];
      post('final', { match: cur.matchId, sets }).then(j => { note = j.msg; cur = null; confirming = false; busy = false; }).catch(e => { note = e.message; confirming = false; busy = false; render(); });
    }
  });

  // live state: switch to the next match automatically, notice if the desk finalized this one
  let retry = 1000;
  function connect() {
    const ws = new WebSocket(`${location.protocol === 'https:' ? 'wss' : 'ws'}://${location.host}/ws/${state.slug}`);
    ws.onmessage = ev => { state = JSON.parse(ev.data); retry = 1000; render(); };
    ws.onclose = () => { setTimeout(connect, retry); retry = Math.min(retry * 2, 15000); };
    ws.onerror = () => ws.close();
  }
  render(); connect();
  // keep the screen awake while scoring, where supported
  navigator.wakeLock?.request?.('screen').catch(() => {});
  document.addEventListener('visibilitychange', () => { if (document.visibilityState === 'visible') navigator.wakeLock?.request?.('screen').catch(() => {}); });
})();