/* Vista Cues — client part.

   One tile: the cue list most recently fired, big, with how long ago and
   who fired it; under it the other lists still live, the recent notes, and
   which senders we are in session with. All of it comes from the server's
   one `state` event; between events only the "how long ago" clocks move. */

const MINUS_SVG = '<svg viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"><path d="M3.5 8h9"/></svg>';
const PLUS_SVG = '<svg viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"><path d="M3.5 8h9M8 3.5v9"/></svg>';
const CLEAR_SVG = '<svg viewBox="0 0 16 16" width="13" height="13" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M6.2 13.5h7.3"/><path d="M2.8 9.6 8.9 3.5a1.4 1.4 0 0 1 2 0l2.1 2.1a1.4 1.4 0 0 1 0 2l-5.9 5.9H5.6L2.8 10.7a.8.8 0 0 1 0-1.1Z"/><path d="m6 6.4 4.1 4.1"/></svg>';

const ACTION_LABEL = {
  go: 'Go',
  release: 'Release',
  releaseAll: 'Release all',
  pause: 'Pause',
  back: 'Back',
  flash: 'Flash',
  cleared: 'Cleared',
  '': '—',
};

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

/** 75 000 ms → "1:15", 3 725 000 → "1:02:05". */
function since(ms) {
  const s = Math.max(0, Math.floor(ms / 1000));
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  const ss = String(s % 60).padStart(2, '0');
  return h ? `${h}:${String(m).padStart(2, '0')}:${ss}` : `${m}:${ss}`;
}

function clockTime(ms) {
  return new Date(ms).toLocaleTimeString([], { hour: 'numeric', minute: '2-digit', second: '2-digit' });
}

export default function create({ root, moduleApi }) {
  const prefs = () => moduleApi.instanceSettings || {};
  const on = (k, dflt = true) => (prefs()[k] === undefined ? dflt : prefs()[k] !== false);
  const scale = () => Math.min(2.5, Math.max(0.5, Number(prefs().textScale) || 1));

  let state = null;
  let skew = 0;            // server clock − our clock
  let stream = null;
  let tick = null;
  let el = {};
  let resizeObserver = null;

  const serverNow = () => Date.now() + skew;

  /* ── fitting the big name to its box ─────────────────────────────── */

  function fit(node) {
    if (!node || !node.isConnected) return;
    node.style.fontSize = '';
    const avail = node.parentElement ? node.parentElement.clientWidth : node.clientWidth;
    let size = parseFloat(getComputedStyle(node).fontSize) || 16;
    for (let i = 0; i < 3 && node.scrollWidth > avail + 0.5 && size > 10; i += 1) {
      size = Math.max(10, size * (avail / node.scrollWidth) * 0.98);
      node.style.fontSize = `${size}px`;
    }
  }

  /* ── drawing ─────────────────────────────────────────────────────── */

  function build() {
    root.innerHTML = `
      <div class="vc-root">
        <div class="vc-offline" hidden></div>
        <div class="vc-body">
          <div class="vc-now">
            <div class="vc-kicker"><span class="vc-pill"></span><span class="vc-ago"></span></div>
            <div class="vc-name-wrap"><div class="vc-name"></div></div>
            <div class="vc-meta"></div>
          </div>
          <div class="vc-active"></div>
          <div class="vc-recent"></div>
          <div class="vc-sources"></div>
        </div>
      </div>`;
    const q = (s) => root.querySelector(s);
    el = {
      root: q('.vc-root'),
      offline: q('.vc-offline'),
      pill: q('.vc-pill'),
      ago: q('.vc-ago'),
      name: q('.vc-name'),
      meta: q('.vc-meta'),
      active: q('.vc-active'),
      recent: q('.vc-recent'),
      sources: q('.vc-sources'),
    };
  }

  function render() {
    if (!el.root) return;
    el.root.style.setProperty('--vc-scale', String(scale()));
    const s = state;
    if (!s) {
      el.name.textContent = 'Connecting…';
      el.root.dataset.tone = 'muted';
      return;
    }

    const connected = s.sources.filter((x) => x.connected);
    const offline = !s.listening || !connected.length;
    el.root.classList.toggle('is-offline', offline);
    el.offline.hidden = !offline;
    el.offline.textContent = !s.listening ? 'Not listening' : 'No MIDI session';

    // Now
    const cur = s.current;
    if (cur) {
      el.root.dataset.tone = cur.state === 'paused' ? 'warn' : 'ok';
      el.pill.textContent = cur.state === 'paused' ? 'Paused' : 'Live';
      el.pill.hidden = false;
      if (el.name.textContent !== cur.name) { el.name.textContent = cur.name; fit(el.name); }
      const bits = [];
      if (cur.goes > 1) bits.push(`Go ×${cur.goes}`);
      if (cur.source) bits.push(cur.source);
      if (cur.lastAction === 'back') bits.push('Back');
      el.meta.textContent = bits.join(' · ');
    } else {
      el.root.dataset.tone = 'muted';
      el.pill.hidden = true;
      const msg = s.rules ? 'No cue list live' : 'No cue lists mapped';
      if (el.name.textContent !== msg) { el.name.textContent = msg; fit(el.name); }
      el.meta.textContent = s.rules ? (s.log.length ? '' : 'Waiting for the first cue') : 'Add the cue sheet in /admin → Vista Cues';
    }

    // Other live lists
    el.active.hidden = !on('showActive') || !s.active.length;
    if (!el.active.hidden) {
      el.active.innerHTML = s.active.map((l) => `
        <div class="vc-chip${l.state === 'paused' ? ' is-paused' : ''}" title="${esc(l.source || '')}">
          ${l.group ? `<span class="vc-chip-group">${esc(l.group)}</span>` : ''}
          <span class="vc-chip-name">${esc(l.name)}</span>
          <span class="vc-chip-ago" data-since="${l.lastAt}"></span>
        </div>`).join('');
    }

    // Recent
    const showUnmapped = on('showUnmapped', false);
    const rows = s.log.filter((e) => e.mapped || showUnmapped).slice(0, 12);
    el.recent.hidden = !on('showRecent') || !rows.length;
    if (!el.recent.hidden) {
      el.recent.innerHTML = rows.map((e) => `
        <div class="vc-row${e.mapped ? '' : ' is-unmapped'}" data-action="${esc(e.action)}">
          <span class="vc-row-time">${esc(clockTime(e.at))}</span>
          <span class="vc-row-action">${esc(e.mapped ? (ACTION_LABEL[e.action] ?? e.action) : 'Unmapped')}</span>
          <span class="vc-row-list">${esc(e.mapped ? e.list : e.trigger)}</span>
          <span class="vc-row-source">${esc(e.source)}</span>
        </div>`).join('');
    }

    // Senders
    el.sources.hidden = !on('showSources') || !s.sources.length;
    if (!el.sources.hidden) {
      el.sources.innerHTML = s.sources.map((x) => `
        <span class="vc-src${x.connected ? ' is-on' : ''}" title="${esc(x.connected ? `${x.name || x.label} · ${x.address}` : (x.error || 'Joining…'))}">
          <span class="vc-dot"></span>${esc(x.label)}
        </span>`).join('');
    }

    updateClocks();
    reportStatus();
  }

  function updateClocks() {
    if (!state || !el.root) return;
    const now = serverNow();
    const cur = state.current;
    el.ago.textContent = cur ? since(now - cur.lastAt) : '';
    el.ago.title = cur ? `Fired ${clockTime(cur.firedAt)}` : '';
    root.querySelectorAll('[data-since]').forEach((n) => {
      n.textContent = since(now - Number(n.dataset.since));
    });
  }

  function reportStatus() {
    const s = state;
    if (!s) return;
    if (!s.listening) return moduleApi.setStatus('error', s.error || 'Not listening for MIDI');
    const connected = s.sources.filter((x) => x.connected);
    const waiting = s.sources.filter((x) => !x.connected);
    if (!connected.length) {
      const why = waiting.length ? `Joining ${waiting.map((x) => `${x.label}${x.error ? ` (${x.error})` : ''}`).join(', ')}` : 'No MIDI session connected';
      return moduleApi.setStatus('error', why);
    }
    const msg = `Hearing ${connected.map((x) => x.label).join(', ')}${waiting.length ? ` · not ${waiting.map((x) => x.label).join(', ')}` : ''}`;
    return moduleApi.setStatus(waiting.length ? 'connecting' : 'ok', msg);
  }

  function take(next) {
    if (!next) return;
    skew = Number(next.now) ? Number(next.now) - Date.now() : 0;
    state = next;
    render();
  }

  async function refresh() {
    try {
      const r = await moduleApi.fetch('/state');
      if (r.ok) take((await r.json()).state);
    } catch { /* the stream will say so */ }
  }

  /* ── title bar ───────────────────────────────────────────────────── */

  function bump(delta) {
    const next = Math.round(Math.min(2.5, Math.max(0.5, scale() + delta)) * 10) / 10;
    moduleApi.saveInstanceSettings({ textScale: next });
    render();
    fit(el.name);
  }

  return {
    start() {
      build();
      render();
      moduleApi.header.addButton({ icon: MINUS_SVG, title: 'Smaller text', onClick: () => bump(-0.1) });
      moduleApi.header.addButton({ icon: PLUS_SVG, title: 'Larger text', onClick: () => bump(0.1) });
      moduleApi.header.addButton({
        icon: CLEAR_SVG,
        title: 'Clear live lists',
        async onClick() {
          try { await moduleApi.fetch('/clear', { method: 'POST' }); } catch { /* status says why */ }
        },
      });
      moduleApi.setStatus('connecting', 'Connecting…');
      stream = moduleApi.sse('/stream', {
        open() { refresh(); },
        error() { moduleApi.setStatus('error', 'Lost connection to ProdDash'); },
        events: {
          state(e) {
            try { take(JSON.parse(e.data)); } catch { /* malformed frame */ }
          },
        },
      });
      refresh();
      tick = setInterval(updateClocks, 1000);
      if (typeof ResizeObserver === 'function') {
        resizeObserver = new ResizeObserver(() => fit(el.name));
        resizeObserver.observe(root);
      }
    },
    stop() {
      clearInterval(tick);
      tick = null;
      if (stream) { stream.close(); stream = null; }
      if (resizeObserver) { resizeObserver.disconnect(); resizeObserver = null; }
      root.innerHTML = '';
      el = {};
    },
    onResize() {
      fit(el.name);
    },
  };
}