/* Dashboard UI layer — builds on the globals from dashboard.html (charts, makeChart, chartColors, …) */
(() => {
'use strict';

const $ = (id) => document.getElementById(id);
const num = (v) => (typeof v === 'number' && Number.isFinite(v) ? v : null);
const fmt = (v, d = 1) => (num(v) == null ? '—' : v.toFixed(d));
const mean = (a) => (a.length ? a.reduce((x, y) => x + y, 0) / a.length : null);
const sum = (a) => a.reduce((x, y) => x + y, 0);
const MS_DAY = 86400000;

let DAILY = [];      // per-day summaries from /api/station/daily (station-local days)
let RECENT = [];     // raw readings, last 48h
let LATEST = null;
let LOC = null;
let TZ = 'America/New_York';
let rainRange = 90;
let calMetric = 'hi';
const rendered = {}; // which lazy tabs have been drawn for the current data

async function getJSON(url) {
  const r = await fetch(url);
  if (r.status === 401) { location.href = '/dashboard/login'; throw new Error('auth'); }
  if (!r.ok) throw new Error(url);
  return r.json();
}

// ── Date helpers (station-local day strings, YYYY-MM-DD) ─────────────────────
function dayStr(ts, tz = TZ) {
  try { return new Intl.DateTimeFormat('en-CA', { timeZone: tz }).format(new Date(ts)); }
  catch { return new Date(ts).toISOString().slice(0, 10); }
}
const dayMs = (s) => Date.parse(s + 'T12:00:00Z');
const addDays = (s, n) => new Date(dayMs(s) + n * MS_DAY).toISOString().slice(0, 10);
const todayStr = () => dayStr(Date.now());
const prettyDay = (s) => new Date(dayMs(s)).toLocaleDateString('en-US', { month: 'short', day: 'numeric', timeZone: 'UTC' });
const prettyMonth = (m) => { const d = new Date(m + '-15T12:00:00Z'); return d.toLocaleDateString('en-US', { month: 'short', timeZone: 'UTC' }) + (d.getUTCMonth() === 0 || true ? ` '${String(d.getUTCFullYear()).slice(2)}` : ''); };
const todayRow = () => DAILY.find((d) => d.d === todayStr()) || null;

// ── Tabs ─────────────────────────────────────────────────────────────────────
const TABS = ['now', 'charts', 'rain', 'records', 'insights'];
function setTab(name, updateHash = true) {
  if (!TABS.includes(name)) name = 'now';
  document.querySelectorAll('.tab').forEach((t) => t.classList.toggle('active', t.dataset.tab === name));
  document.querySelectorAll('.tab-pane').forEach((p) => p.classList.toggle('active', p.dataset.pane === name));
  if (updateHash) history.replaceState(null, '', '#' + name);
  try { sessionStorage.setItem('dashTab', name); } catch {}
  requestAnimationFrame(() => Object.values(typeof charts !== 'undefined' ? charts : {}).forEach((c) => { try { c.resize(); } catch {} }));
  renderTab(name);
  if (updateHash) window.scrollTo({ top: 0 });
}
function activeTab() { return document.querySelector('.tab.active')?.dataset.tab || 'now'; }
function renderTab(name) {
  if (name === 'rain' && !rendered.rain) { renderRain(); rendered.rain = true; }
  if (name === 'records' && !rendered.cal) { renderCalendar(); rendered.cal = true; }
  if (name === 'insights' && !rendered.insights) { renderInsights(); rendered.insights = true; }
}
document.querySelectorAll('.tab').forEach((t) => t.addEventListener('click', () => setTab(t.dataset.tab)));
window.addEventListener('hashchange', () => setTab(location.hash.slice(1), false));

// Tabs replace the collapsible panels: keep every panel open (their lazy loaders fire on toggle)
document.querySelectorAll('details.settings-panel').forEach((d) => {
  d.classList.add('always-open');
  d.querySelector('summary')?.addEventListener('click', (e) => e.preventDefault());
  d.open = true;
});

// Keep sticky tab bar flush under the (variable-height) header
const headerEl = document.querySelector('.header');
if (headerEl && 'ResizeObserver' in window) {
  new ResizeObserver(() => document.documentElement.style.setProperty('--header-h', headerEl.offsetHeight + 'px')).observe(headerEl);
}

// ── Astronomy ────────────────────────────────────────────────────────────────
const RAD = Math.PI / 180;
function solarPos(ts, lat, lon) {
  const d = ts / MS_DAY + 2440587.5 - 2451545.0;
  const L = (280.46 + 0.9856474 * d) % 360;
  const g = ((357.528 + 0.9856003 * d) % 360) * RAD;
  const lam = (L + 1.915 * Math.sin(g) + 0.02 * Math.sin(2 * g)) * RAD;
  const eps = (23.439 - 0.0000004 * d) * RAD;
  const dec = Math.asin(Math.sin(eps) * Math.sin(lam));
  const ra = Math.atan2(Math.cos(eps) * Math.sin(lam), Math.cos(lam));
  const gmst = ((280.46061837 + 360.98564736629 * d) % 360) * RAD;
  const H = gmst + lon * RAD - ra;
  const sinEl = Math.sin(lat * RAD) * Math.sin(dec) + Math.cos(lat * RAD) * Math.cos(dec) * Math.cos(H);
  return { sinEl, elevation: Math.asin(sinEl) / RAD };
}
// Haurwitz clear-sky global horizontal irradiance (W/m²)
window.clearSkyGHI = function (ts) {
  if (!LOC) return null;
  const s = solarPos(ts, LOC.lat, LOC.lon).sinEl;
  return s > 0.02 ? Math.round(1098 * s * Math.exp(-0.057 / s)) : 0;
};
function sunTimes(noonMs, lat, lon) {
  const jd = noonMs / MS_DAY + 2440587.5;
  const n = Math.ceil(jd - 2451545.0 + 0.0008);
  const Js = n - lon / 360;
  const M = ((357.5291 + 0.98560028 * Js) % 360) * RAD;
  const C = 1.9148 * Math.sin(M) + 0.02 * Math.sin(2 * M) + 0.0003 * Math.sin(3 * M);
  const lam = (((M / RAD + C + 180 + 102.9372) % 360)) * RAD;
  const Jt = 2451545.0 + Js + 0.0053 * Math.sin(M) - 0.0069 * Math.sin(2 * lam);
  const sinDec = Math.sin(lam) * Math.sin(23.4397 * RAD);
  const cosDec = Math.cos(Math.asin(sinDec));
  const cosW = (Math.sin(-0.833 * RAD) - Math.sin(lat * RAD) * sinDec) / (Math.cos(lat * RAD) * cosDec);
  if (cosW > 1 || cosW < -1) return null; // polar day/night
  const w = Math.acos(cosW) / RAD;
  const toMs = (j) => (j - 2440587.5) * MS_DAY;
  return { rise: toMs(Jt - w / 360), set: toMs(Jt + w / 360), noon: toMs(Jt) };
}
const SYNODIC = 29.530588853;
const NEW_MOON = Date.UTC(2000, 0, 6, 18, 14);
function moonInfo(ts) {
  const phase = ((((ts - NEW_MOON) / MS_DAY) / SYNODIC) % 1 + 1) % 1;
  const names = ['New Moon', 'Waxing Crescent', 'First Quarter', 'Waxing Gibbous', 'Full Moon', 'Waning Gibbous', 'Last Quarter', 'Waning Crescent'];
  const icons = ['🌑', '🌒', '🌓', '🌔', '🌕', '🌖', '🌗', '🌘'];
  const i = Math.round(phase * 8) % 8;
  const untilFull = ((0.5 - phase + 1) % 1) * SYNODIC;
  const untilNew = ((1 - phase) % 1) * SYNODIC;
  return { name: names[i], icon: icons[i], illum: (1 - Math.cos(2 * Math.PI * phase)) / 2, untilFull, untilNew };
}
const clock = (ms) => new Date(ms).toLocaleTimeString([], { hour: 'numeric', minute: '2-digit' });
const hm = (ms) => { const m = Math.round(ms / 60000); return `${Math.floor(m / 60)}h ${m % 60}m`; };

// ── Now tab ──────────────────────────────────────────────────────────────────
const DELTAS = [
  { id: 'sHum', key: 'humidity', unit: '%', d: 0, eps: 1 },
  { id: 'sDew', key: 'dewPoint', unit: '°', d: 1, eps: 0.5 },
  { id: 'sPres', key: 'baromrelin', unit: ' inHg', d: 2, eps: 0.01 },
  { id: 'sWind', key: 'windspeedmph', unit: ' mph', d: 1, eps: 0.5 },
  { id: 'sUV', key: 'uv', unit: '', d: 1, eps: 0.5 },
  { id: 'sSolar', key: 'solarradiation', unit: ' W/m²', d: 0, eps: 10 },
];
function nearestReading(ts, tolMs = 30 * 60000) {
  let best = null, bd = Infinity;
  for (const r of RECENT) { const dd = Math.abs(r.dateutc - ts); if (dd < bd) { bd = dd; best = r; } }
  return bd <= tolMs ? best : null;
}
function setDelta(host, key, cur, prev, unit, d, eps, after) {
  if (!host) return;
  let el = host.querySelector(`.delta[data-k="${key}"]`);
  if (!el) {
    el = document.createElement('div');
    el.className = 'delta'; el.dataset.k = key;
    if (after && after.parentNode === host) after.after(el); else host.appendChild(el);
  }
  if (num(cur) == null || num(prev) == null) { el.textContent = ''; return; }
  const diff = cur - prev;
  const cls = Math.abs(diff) < eps ? 'flat' : diff > 0 ? 'up' : 'down';
  el.className = 'delta ' + cls;
  el.textContent = cls === 'flat' ? 'Same as yesterday' : `${diff > 0 ? '▲' : '▼'} ${Math.abs(diff).toFixed(d)}${unit} vs yesterday`;
}

function drawArea(canvas, values, color) {
  if (!canvas) return;
  const dpr = window.devicePixelRatio || 1;
  const W = canvas.clientWidth || 200, H = canvas.clientHeight || 60;
  canvas.width = W * dpr; canvas.height = H * dpr;
  const ctx = canvas.getContext('2d');
  ctx.scale(dpr, dpr);
  const vals = values.filter((v) => v != null);
  if (vals.length < 2) return;
  const min = Math.min(...vals), max = Math.max(...vals), rng = max - min || 1;
  const step = W / (values.length - 1);
  const pts = [];
  values.forEach((v, i) => { if (v != null) pts.push([i * step, H - 4 - ((v - min) / rng) * (H - 12)]); });
  const g = ctx.createLinearGradient(0, 0, 0, H);
  g.addColorStop(0, color + '66'); g.addColorStop(1, color + '00');
  ctx.beginPath(); ctx.moveTo(pts[0][0], pts[0][1]);
  for (let i = 1; i < pts.length; i++) ctx.lineTo(pts[i][0], pts[i][1]);
  ctx.strokeStyle = color; ctx.lineWidth = 2; ctx.lineJoin = 'round'; ctx.stroke();
  ctx.lineTo(pts[pts.length - 1][0], H); ctx.lineTo(pts[0][0], H); ctx.closePath();
  ctx.fillStyle = g; ctx.fill();
}

function ensureHeroExtras() {
  const main = document.querySelector('.hero-main');
  if (!main || main.querySelector('.hero-spark')) return;
  const cv = document.createElement('canvas');
  cv.className = 'hero-spark'; cv.id = 'heroSpark';
  main.prepend(cv);
  const hilo = document.createElement('div');
  hilo.className = 'hero-hilo'; hilo.id = 'heroHiLo';
  $('heroWindLine')?.after(hilo);
}

function ensureWindCompass() {
  if ($('windCompass')) return;
  const tile = $('statWindTile');
  const stats = tile?.closest('.stats');
  if (!stats) return;
  const wrap = document.createElement('div');
  wrap.className = 'wind-wrap';
  wrap.innerHTML = '<div id="windCompass"></div>';
  stats.before(wrap);
  wrap.appendChild(stats);
}
function updateCompass(r) {
  const el = $('windCompass');
  if (!el || !r) return;
  const dir = num(r.winddir), spd = num(r.windspeedmph) ?? 0;
  const gust = num(r.windgustmph);
  const rot = dir != null ? (dir + 180) % 360 : 0; // arrow shows where the wind is heading
  const ticks = Array.from({ length: 16 }, (_, i) => {
    const a = i * 22.5 * RAD, big = i % 4 === 0;
    const x1 = 58 + Math.sin(a) * (big ? 44 : 48), y1 = 58 - Math.cos(a) * (big ? 44 : 48);
    const x2 = 58 + Math.sin(a) * 52, y2 = 58 - Math.cos(a) * 52;
    return `<line x1="${x1.toFixed(1)}" y1="${y1.toFixed(1)}" x2="${x2.toFixed(1)}" y2="${y2.toFixed(1)}" stroke="var(--border)" stroke-width="${big ? 1.6 : 1}"/>`;
  }).join('');
  el.innerHTML = `<svg viewBox="0 0 116 116" role="img" aria-label="Wind ${dir != null ? cardinal(dir) : 'calm'} ${spd.toFixed(1)} mph">
    <circle cx="58" cy="58" r="52" fill="var(--paper)" stroke="var(--border)"/>${ticks}
    <g font-size="9" font-weight="700" fill="var(--ink-light)" text-anchor="middle">
      <text x="58" y="19">N</text><text x="100" y="61">E</text><text x="58" y="103">S</text><text x="16" y="61">W</text></g>
    ${spd > 0.5 && dir != null ? `<g transform="rotate(${rot} 58 58)"><path d="M58 24 L67 56 L58 50 L49 56 Z" fill="var(--accent)"/><line x1="58" y1="50" x2="58" y2="86" stroke="var(--accent)" stroke-width="2" stroke-linecap="round"/></g>` : ''}
    <text x="58" y="60" text-anchor="middle" font-size="15" font-weight="800" fill="var(--ink)">${spd > 0.5 ? spd.toFixed(0) : '0'}</text>
    <text x="58" y="72" text-anchor="middle" font-size="7.5" fill="var(--ink-light)">mph${dir != null && spd > 0.5 ? ' · ' + cardinal(dir) : ''}</text>
    ${gust != null && gust > spd + 1 ? `<text x="58" y="82" text-anchor="middle" font-size="7" fill="var(--ink-light)">gust ${gust.toFixed(0)}</text>` : ''}
  </svg>`;
}

function renderNowExtras() {
  ensureHeroExtras();
  ensureWindCompass();
  if (!LATEST) return;
  const prev = nearestReading(LATEST.dateutc - MS_DAY);
  // Delta lines under each tile
  for (const m of DELTAS) {
    const val = document.getElementById(m.id);
    const host = val?.parentElement;
    setDelta(host, m.key, LATEST[m.key], prev?.[m.key], m.unit, m.d, m.eps, host?.querySelector('.hero-stat-unit, .stat-unit') || val);
  }
  setDelta(document.querySelector('.hero-main'), 'tempf', LATEST.tempf, prev?.tempf, '°', 1, 0.5, document.querySelector('.hero-temp-row'));

  // Hero 24h temperature trace
  const last24 = RECENT.filter((r) => r.dateutc >= LATEST.dateutc - MS_DAY);
  drawArea($('heroSpark'), last24.map((r) => r.tempf), chartColors().accent);
  if (typeof updateSparklines === 'function') updateSparklines(last24);

  // Today's range (from the persistent daily store — always the station-local day)
  const t = todayRow();
  if (t) {
    if ($('heroHiLo')) $('heroHiLo').innerHTML = `<span>Today</span><span class="hi">↑ ${fmt(t.hi)}°</span><span class="lo">↓ ${fmt(t.lo)}°</span>`;
    $('todayHigh').textContent = fmt(t.hi); $('todayLow').textContent = fmt(t.lo);
    $('todayRain').textContent = fmt(t.rain, 2); $('todayGust').textContent = fmt(t.gust);
    $('todayBar').style.display = '';
  }
  updateCompass(LATEST);
  renderSunCard();
  renderHealthCard();
  renderHighlights();
}

function renderSunCard() {
  const host = $('sunCard');
  if (!host) return;
  if (!LOC) {
    host.innerHTML = `<div class="ui-card"><h3>Sun &amp; Moon</h3><p class="note">Set your station location in <a href="/dashboard/settings">Settings</a> to see sunrise, sunset, day length and moon phase.</p></div>`;
    return;
  }
  const now = Date.now();
  const n = new Date();
  const noon = new Date(n.getFullYear(), n.getMonth(), n.getDate(), 12).getTime();
  const st = sunTimes(noon, LOC.lat, LOC.lon);
  const stTomorrow = sunTimes(noon + MS_DAY, LOC.lat, LOC.lon);
  const moon = moonInfo(now);
  const el = solarPos(now, LOC.lat, LOC.lon).elevation;
  let arc = '';
  let body = '<p class="note">No sunrise/sunset at this latitude today.</p>';
  if (st) {
    const f = Math.max(0, Math.min(1, (now - st.rise) / (st.set - st.rise)));
    const day = now >= st.rise && now <= st.set;
    const x = 20 + 260 * f, y = 76 - 58 * Math.sin(Math.PI * f);
    arc = `<svg class="sun-arc" viewBox="0 0 300 86" preserveAspectRatio="xMidYMid meet" aria-hidden="true">
      <line x1="10" y1="76" x2="290" y2="76" stroke="var(--border)"/>
      <path d="M20 76 A130 58 0 0 1 280 76" fill="none" stroke="var(--border)" stroke-dasharray="4 4"/>
      <circle cx="${x.toFixed(1)}" cy="${y.toFixed(1)}" r="8" fill="${day ? '#f5b82e' : 'var(--ink-light)'}" opacity="${day ? 1 : 0.5}"/></svg>`;
    const delta = stTomorrow ? (stTomorrow.set - stTomorrow.rise) - (st.set - st.rise) : null;
    body = `<div class="kv">
      <div><b>${clock(st.rise)}</b><span>Sunrise</span></div>
      <div><b>${clock(st.set)}</b><span>Sunset</span></div>
      <div><b>${hm(st.set - st.rise)}</b><span>Daylight</span>${delta != null ? `<small>${delta >= 0 ? '+' : '−'}${Math.abs(Math.round(delta / 1000))}s tomorrow</small>` : ''}</div>
      <div><b>${clock(st.noon)}</b><span>Solar noon</span><small>sun ${el > 0 ? Math.round(el) + '° up' : 'below horizon'}</small></div>
    </div>`;
  }
  host.innerHTML = `<div class="ui-card"><h3>Sun &amp; Moon</h3>${arc}${body}
    <div class="kv" style="margin-top:0.9rem;padding-top:0.8rem;border-top:1px solid var(--border)">
      <div><b>${moon.icon} ${Math.round(moon.illum * 100)}%</b><span>${moon.name}</span></div>
      <div><b>${prettyDay(dayStr(now + moon.untilFull * MS_DAY))}</b><span>Next full</span></div>
      <div><b>${prettyDay(dayStr(now + moon.untilNew * MS_DAY))}</b><span>Next new</span></div>
    </div></div>`;
}

function medianIntervalMin() {
  const d = [];
  for (let i = 1; i < RECENT.length; i++) { const x = RECENT[i].dateutc - RECENT[i - 1].dateutc; if (x > 0 && x < 20 * 60000) d.push(x); }
  if (!d.length) return null;
  d.sort((a, b) => a - b);
  return d[d.length >> 1] / 60000;
}
function coverageFor(row, perDay) { return row && perDay ? Math.min(100, (row.n / perDay) * 100) : null; }

function renderHealthCard() {
  const host = $('healthCard');
  if (!host || !LATEST) return;
  const ageMin = Math.round((Date.now() - LATEST.dateutc) / 60000);
  const ok = ageMin <= 10;
  const interval = medianIntervalMin();
  const perDay = interval ? 1440 / interval : null;
  const past = DAILY.filter((d) => d.d !== todayStr()).slice(-30);
  const cov = perDay && past.length ? mean(past.map((d) => coverageFor(d, perDay))) : null;
  const t = todayRow();
  host.innerHTML = `<div class="ui-card"><h3>Station Health</h3><div class="kv">
    <div><b><span class="pill ${ok ? 'ok' : 'warn'}">${ok ? 'Online' : 'Delayed'}</span></b><span>Last report</span><small>${ageMin <= 0 ? 'just now' : ageMin + ' min ago'}</small></div>
    <div><b>${LATEST.battout == null ? '—' : LATEST.battout === 1 ? 'OK' : 'Low'}</b><span>Battery</span></div>
    <div><b>${interval ? interval.toFixed(interval % 1 ? 1 : 0) + ' min' : '—'}</b><span>Report interval</span></div>
    <div><b>${t ? t.n.toLocaleString() : '—'}</b><span>Readings today</span></div>
    <div><b>${cov != null ? cov.toFixed(0) + '%' : '—'}</b><span>30-day coverage</span>${cov != null ? `<div class="bar-meter"><i style="width:${cov.toFixed(0)}%"></i></div>` : ''}</div>
    <div><b>${DAILY.length}</b><span>Days recorded</span><small>${DAILY[0] ? 'since ' + prettyDay(DAILY[0].d) : ''}</small></div>
  </div></div>`;
}

function ordinal(n) { const s = ['th', 'st', 'nd', 'rd'], v = n % 100; return n + (s[(v - 20) % 10] || s[v] || s[0]); }
function renderHighlights() {
  const host = $('highlights');
  if (!host) return;
  const t = todayRow();
  const hist = DAILY.filter((d) => d.d !== todayStr());
  if (!t || hist.length < 7) { host.innerHTML = ''; return; }
  const chips = [];
  const check = (key, label, better, minVal, icon, cool, unit, d = 1, partial = true) => {
    const v = t[key];
    if (num(v) == null || (minVal != null && v < minVal)) return;
    const others = hist.filter((x) => num(x[key]) != null);
    if (others.length < 7) return;
    const rank = others.filter((x) => better(x[key], v)).length + 1;
    const val = `${v.toFixed(d)}${unit}`;
    const so = partial ? ' so far' : '';
    if (rank === 1) { chips.push({ t: `${icon} ${label} on record (${val}${so})`, cool }); return; }
    if (rank <= 3) { chips.push({ t: `${icon} ${ordinal(rank)} ${label.toLowerCase()} on record (${val}${so})`, cool }); return; }
    let since = 0;
    for (let i = hist.length - 1; i >= 0; i--) { if (num(hist[i][key]) != null && !better(v, hist[i][key]) && hist[i][key] !== v) { since = hist.length - i; break; } }
    if (since >= 14) chips.push({ t: `${icon} ${label} in ${since} days (${val}${so})`, cool });
  };
  check('hi', 'Hottest day', (a, b) => a >= b, null, '🔥', false, '°');
  check('lo', 'Coldest night', (a, b) => a <= b, null, '❄️', true, '°', 1, true);
  check('gust', 'Windiest day', (a, b) => a >= b, 10, '💨', true, ' mph');
  check('rain', 'Wettest day', (a, b) => a >= b, 0.1, '🌧', true, '"', 2);
  host.innerHTML = chips.slice(0, 4).map((c) => `<span class="chip${c.cool ? ' cool' : ''}">${c.t}</span>`).join('');
}

// ── Rain tab ─────────────────────────────────────────────────────────────────
function windowDays(n) {
  const end = todayStr();
  const map = new Map(DAILY.map((d) => [d.d, d]));
  const out = [];
  for (let i = n - 1; i >= 0; i--) { const s = addDays(end, -i); out.push({ d: s, row: map.get(s) || null }); }
  return out;
}
function renderRain() {
  const host = $('rainTab');
  if (!host) return;
  if (!DAILY.length) { host.innerHTML = '<div class="status">No daily data recorded yet.</div>'; return; }
  const win = windowDays(rainRange).filter((x, i, a) => x.row || i >= a.findIndex((y) => y.row));
  const known = win.filter((x) => x.row && num(x.row.rain) != null);
  const total = sum(known.map((x) => x.row.rain));
  const rainy = known.filter((x) => x.row.rain >= 0.01);
  const wettest = known.reduce((b, x) => (!b || x.row.rain > b.row.rain ? x : b), null);
  let dry = 0, run = 0;
  for (const x of win) { if (x.row && x.row.rain < 0.01) { run++; dry = Math.max(dry, run); } else run = 0; }
  host.innerHTML = `
    <div class="range-bar" id="rainRange"><span>Window:</span>
      ${[30, 90, 365].map((n) => `<button class="range-btn${n === rainRange ? ' active' : ''}" data-rr="${n}">${n === 365 ? '1y' : n + 'd'}</button>`).join('')}</div>
    <div class="stats secondary" style="margin-bottom:1rem">
      <div class="stat"><div class="stat-label">Total</div><div class="stat-val">${total.toFixed(2)}</div><div class="stat-unit">in</div></div>
      <div class="stat"><div class="stat-label">Rainy days</div><div class="stat-val">${rainy.length}</div><div class="stat-unit">of ${known.length} days</div></div>
      <div class="stat"><div class="stat-label">Wettest day</div><div class="stat-val">${wettest ? wettest.row.rain.toFixed(2) : '—'}</div><div class="stat-unit">${wettest ? prettyDay(wettest.d) : ''}</div></div>
      <div class="stat"><div class="stat-label">Avg / rainy day</div><div class="stat-val">${rainy.length ? (total / rainy.length).toFixed(2) : '—'}</div><div class="stat-unit">in</div></div>
      <div class="stat"><div class="stat-label">Longest dry spell</div><div class="stat-val">${dry}</div><div class="stat-unit">days</div></div>
    </div>
    <div class="charts">
      <div class="chart-card wide"><div class="chart-title">Daily rain &amp; cumulative total</div><div class="chart-wrap"><canvas id="rnDaily"></canvas></div></div>
      <div class="chart-card wide"><div class="chart-title">Monthly totals</div><div class="chart-wrap" style="height:200px"><canvas id="rnMonthly"></canvas></div></div>
    </div>`;
  host.querySelectorAll('[data-rr]').forEach((b) => b.addEventListener('click', () => { rainRange = +b.dataset.rr; renderRain(); }));

  const c = chartColors();
  let cum = 0;
  const cumul = win.map((x) => { if (x.row && num(x.row.rain) != null) cum += x.row.rain; return +cum.toFixed(2); });
  makeChart('rnDaily', 'bar', [
    { ...barDataset('Daily rain (in)', win.map((x) => (x.row ? x.row.rain : null)), c.cool), yAxisID: 'y' },
    { type: 'line', label: 'Cumulative (in)', data: cumul, borderColor: c.accent, backgroundColor: c.accent + '00', borderWidth: 2, pointRadius: 0, tension: 0.2, yAxisID: 'y2' },
  ], win.map((x) => prettyDay(x.d)), 'in/day', {
    scales: { y: { min: 0 }, y2: { position: 'right', min: 0, grid: { drawOnChartArea: false }, ticks: { color: c.inkLight, font: { size: 11 } } } },
  });
  const byMonth = {};
  for (const d of DAILY) if (num(d.rain) != null) { const m = d.d.slice(0, 7); byMonth[m] = (byMonth[m] || 0) + d.rain; }
  const months = Object.keys(byMonth).sort();
  makeChart('rnMonthly', 'bar', [barDataset('Total rain (in)', months.map((m) => +byMonth[m].toFixed(2)), c.cool)],
    months.map(prettyMonth), 'in', { scales: { y: { min: 0 } } });
}

// ── Calendar (Records tab) ───────────────────────────────────────────────────
const CAL = {
  hi: { label: 'High temp', get: (d) => d.hi, color: (v) => { if (v == null) return 'var(--border)'; const n = Math.max(0, Math.min(1, (v - 20) / 90)); return `rgb(${Math.round(42 + n * 182)},${Math.round(107 + n * 13)},${Math.round(138 - n * 96)})`; }, fmt: (v) => v.toFixed(1) + '°F', legend: [20, 40, 60, 80, 100] },
  lo: { label: 'Low temp', get: (d) => d.lo, color: (v) => CAL.hi.color(v), fmt: (v) => v.toFixed(1) + '°F', legend: [20, 40, 60, 80, 100] },
  rain: { label: 'Rain', get: (d) => d.rain, color: (v) => (v == null ? 'var(--border)' : v < 0.01 ? 'color-mix(in srgb, var(--border) 60%, transparent)' : `color-mix(in srgb, var(--cool) ${Math.round(25 + Math.min(1, v / 1.5) * 75)}%, transparent)`), fmt: (v) => v.toFixed(2) + '"', legend: [0, 0.1, 0.4, 0.8, 1.5] },
  gust: { label: 'Peak gust', get: (d) => d.gust, color: (v) => (v == null ? 'var(--border)' : `color-mix(in srgb, var(--accent) ${Math.round(10 + Math.min(1, v / 40) * 90)}%, transparent)`), fmt: (v) => v.toFixed(0) + ' mph', legend: [0, 10, 20, 30, 40] },
};
function renderCalendar() {
  const host = $('calendarCard');
  if (!host) return;
  if (!DAILY.length) { host.innerHTML = '<div class="status">No daily data yet.</div>'; return; }
  const M = CAL[calMetric];
  const map = new Map(DAILY.map((d) => [d.d, d]));
  const end = todayStr();
  let start = addDays(end, -364);
  const dow = new Date(dayMs(start)).getUTCDay();
  start = addDays(start, -dow);
  const cells = [], labels = [];
  let col = 0, lastMonth = '';
  for (let s = start, i = 0; s <= end; s = addDays(s, 1), i++) {
    if (i % 7 === 0) {
      col = i / 7;
      const m = s.slice(0, 7);
      if (m !== lastMonth && s >= addDays(end, -364)) { labels.push(`<span style="grid-column:${col + 1}">${new Date(dayMs(s)).toLocaleDateString('en-US', { month: 'short', timeZone: 'UTC' })}</span>`); lastMonth = m; }
    }
    const row = map.get(s), v = row ? M.get(row) : null;
    const before = s < addDays(end, -364);
    cells.push(`<div class="heatmap-cell${s === end ? ' today' : ''}" style="background:${before ? 'transparent' : M.color(num(v))}" title="${prettyDay(s)}${num(v) != null ? ': ' + M.fmt(v) : ''}"></div>`);
  }
  host.innerHTML = `<div class="section-card-hdr">Calendar</div>
    <div class="cal-bar">${Object.entries(CAL).map(([k, m]) => `<button class="range-btn${k === calMetric ? ' active' : ''}" data-cal="${k}">${m.label}</button>`).join('')}</div>
    <div class="heatmap-wrap"><div class="cal-months">${labels.join('')}</div><div class="heatmap">${cells.join('')}</div></div>
    <div class="heatmap-legend"><span>Low</span>${M.legend.map((v) => `<div class="heatmap-legend-swatch" style="background:${M.color(v)}"></div>`).join('')}<span>High</span></div>`;
  host.querySelectorAll('[data-cal]').forEach((b) => b.addEventListener('click', () => { calMetric = b.dataset.cal; renderCalendar(); }));
  const wrap = host.querySelector('.heatmap-wrap');
  if (wrap) wrap.scrollLeft = wrap.scrollWidth; // show the most recent weeks on phones
}

// ── Insights tab ─────────────────────────────────────────────────────────────
function drawRose(canvas, buckets) {
  const dpr = window.devicePixelRatio || 1, S = 170;
  canvas.width = S * dpr; canvas.height = S * dpr;
  const ctx = canvas.getContext('2d');
  ctx.scale(dpr, dpr);
  const cs = getComputedStyle(document.documentElement);
  const border = cs.getPropertyValue('--border').trim(), accent = cs.getPropertyValue('--accent').trim(), light = cs.getPropertyValue('--ink-light').trim();
  const cx = S / 2, R = S / 2 - 18, max = Math.max(...buckets, 1), sl = (Math.PI * 2) / 16;
  for (let i = 1; i <= 3; i++) { ctx.beginPath(); ctx.arc(cx, cx, (R * i) / 3, 0, Math.PI * 2); ctx.strokeStyle = border + '88'; ctx.lineWidth = 0.6; ctx.stroke(); }
  ctx.fillStyle = light; ctx.font = '10px sans-serif'; ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
  ['N', 'E', 'S', 'W'].forEach((l, i) => { const a = (i * Math.PI) / 2 - Math.PI / 2; ctx.fillText(l, cx + Math.cos(a) * (R + 10), cx + Math.sin(a) * (R + 10)); });
  buckets.forEach((b, i) => {
    const len = (b / max) * R; if (len < 1) return;
    const a = i * sl - Math.PI / 2 - sl / 2;
    ctx.beginPath(); ctx.moveTo(cx, cx); ctx.arc(cx, cx, len, a, a + sl); ctx.closePath();
    ctx.fillStyle = accent + 'cc'; ctx.fill(); ctx.strokeStyle = accent; ctx.lineWidth = 0.5; ctx.stroke();
  });
}
function seasonOf(month, south) {
  const m = +month;
  const s = m === 12 || m <= 2 ? 0 : m <= 5 ? 1 : m <= 8 ? 2 : 3; // DJF MAM JJA SON
  return south ? (s + 2) % 4 : s;
}
function trendRow(label, cur, prev, d, unit, goodUp) {
  if (cur == null || prev == null) return `<div class="cmp-row"><span>${label}</span><b>—</b></div>`;
  const diff = cur - prev;
  const cls = Math.abs(diff) < Math.pow(10, -d) ? 'flat' : diff > 0 ? 'up' : 'down';
  return `<div class="cmp-row"><span>${label}</span><span><b>${cur.toFixed(d)}${unit}</b> <span class="delta ${cls}" style="display:inline">${cls === 'flat' ? '=' : (diff > 0 ? '▲ ' : '▼ ') + Math.abs(diff).toFixed(d) + unit}</span></span></div>`;
}
function renderInsights() {
  const host = $('insightsBody');
  if (!host) return;
  if (DAILY.length < 3) { host.innerHTML = '<div class="status">Insights unlock after a few days of recorded data.</div>'; return; }
  const past = DAILY.filter((d) => d.d !== todayStr());
  const W = Math.min(30, Math.floor(past.length / 2));
  let compare = '<p class="note">Needs at least 14 recorded days to compare periods.</p>';
  if (W >= 7) {
    const cur = past.slice(-W), prev = past.slice(-2 * W, -W);
    const col = (a, k) => a.map((x) => x[k]).filter((v) => num(v) != null);
    compare = `<p class="note" style="margin-bottom:0.5rem">Last ${W} days vs the ${W} before</p>
      ${trendRow('Avg temp', mean(col(cur, 'avg')), mean(col(prev, 'avg')), 1, '°')}
      ${trendRow('Avg high', mean(col(cur, 'hi')), mean(col(prev, 'hi')), 1, '°')}
      ${trendRow('Avg low', mean(col(cur, 'lo')), mean(col(prev, 'lo')), 1, '°')}
      ${trendRow('Rain total', sum(col(cur, 'rain')), sum(col(prev, 'rain')), 2, '"')}
      ${trendRow('Rainy days', col(cur, 'rain').filter((v) => v >= 0.01).length, col(prev, 'rain').filter((v) => v >= 0.01).length, 0, '')}
      ${trendRow('Peak gust', Math.max(...col(cur, 'gust'), 0), Math.max(...col(prev, 'gust'), 0), 0, ' mph')}`;
  }
  // Normals: this calendar month vs the same month in earlier years
  const thisMonth = todayStr().slice(5, 7), thisYear = todayStr().slice(0, 4);
  const monthRows = (y) => DAILY.filter((d) => d.d.startsWith(`${y}-${thisMonth}`));
  const years = [...new Set(DAILY.map((d) => d.d.slice(0, 4)))].filter((y) => y !== thisYear && monthRows(y).length >= 20);
  const curRows = monthRows(thisYear);
  let normals = `<p class="note">Station normals unlock once a full year of data is recorded — ${DAILY.length} day${DAILY.length === 1 ? '' : 's'} so far. Until then, use the period comparison.</p>`;
  if (years.length && curRows.length) {
    const avgOf = (y, k) => mean(monthRows(y).map((d) => d[k]).filter((v) => num(v) != null));
    const normAvg = (k) => mean(years.map((y) => avgOf(y, k)).filter((v) => v != null));
    const rainNorm = mean(years.map((y) => sum(monthRows(y).map((d) => d.rain || 0))));
    normals = `<p class="note" style="margin-bottom:0.5rem">This month vs ${years.length}-year station average</p>
      ${trendRow('Avg temp', mean(curRows.map((d) => d.avg).filter((v) => v != null)), normAvg('avg'), 1, '°')}
      ${trendRow('Avg high', mean(curRows.map((d) => d.hi).filter((v) => v != null)), normAvg('hi'), 1, '°')}
      ${trendRow('Avg low', mean(curRows.map((d) => d.lo).filter((v) => v != null)), normAvg('lo'), 1, '°')}
      ${trendRow('Rain (month to date vs full month avg)', sum(curRows.map((d) => d.rain || 0)), rainNorm, 2, '"')}`;
  }
  host.innerHTML = `
    <div class="insight-grid">
      <div class="ui-card"><h3>Trends</h3>${compare}</div>
      <div class="ui-card"><h3>Vs normal</h3>${normals}</div>
    </div>
    <div class="charts" style="margin-bottom:1rem">
      <div class="chart-card wide"><div class="chart-title">Daily temperature range (last 60 days)</div><div class="chart-wrap"><canvas id="inDiurnal"></canvas></div></div>
      <div class="chart-card wide"><div class="chart-title">Data coverage by day</div><div class="chart-wrap" style="height:150px"><canvas id="inCoverage"></canvas></div></div>
    </div>
    <div class="ui-card" style="margin-bottom:1rem"><h3>Prevailing wind by season</h3><div class="roses" id="seasonRoses"></div>
      <p class="note" style="margin-top:0.7rem">Share of readings with measurable wind, by direction it blows from.</p></div>`;

  const c = chartColors();
  const last60 = past.slice(-60);
  makeChart('inDiurnal', 'bar', [
    { label: 'Low–High', data: last60.map((d) => (d.lo != null && d.hi != null ? [d.lo, d.hi] : null)), backgroundColor: c.accent + '77', borderColor: c.accent, borderWidth: 1, borderRadius: 3, borderSkipped: false },
    { type: 'line', label: 'Average', data: last60.map((d) => d.avg), borderColor: c.cool, backgroundColor: c.cool + '00', borderWidth: 2, pointRadius: 0, tension: 0.3 },
  ], last60.map((d) => prettyDay(d.d)), '°F', (() => {
    const los = last60.map((d) => d.lo).filter((v) => v != null), his = last60.map((d) => d.hi).filter((v) => v != null);
    return los.length ? { scales: { y: { min: Math.floor(Math.min(...los) - 3), max: Math.ceil(Math.max(...his) + 3) } } } : {};
  })());

  const interval = medianIntervalMin();
  const perDay = interval ? 1440 / interval : null;
  const cov = past.slice(-45);
  if (perDay) {
    const vals = cov.map((d) => +coverageFor(d, perDay).toFixed(0));
    const ds = barDataset('Coverage %', vals, c.cool);
    ds.backgroundColor = vals.map((v) => (v < 90 ? c.accent + 'bb' : c.cool + 'bb'));
    makeChart('inCoverage', 'bar', [ds], cov.map((d) => prettyDay(d.d)), '%', { scales: { y: { min: 0, max: 100 } } });
  }

  const south = LOC && LOC.lat < 0;
  const names = south ? ['Summer', 'Autumn', 'Winter', 'Spring'] : ['Winter', 'Spring', 'Summer', 'Fall'];
  const seasons = names.map(() => new Array(16).fill(0));
  for (const d of DAILY) if (d.wd) { const s = seasonOf(d.d.slice(5, 7), south); d.wd.forEach((v, i) => { seasons[s][i] += v; }); }
  const roses = $('seasonRoses');
  const cards = seasons.map((b, i) => ({ name: names[i], b, total: sum(b) })).filter((x) => x.total > 0);
  if (!cards.length) roses.innerHTML = '<p class="note">Wind direction history builds up as new readings are saved.</p>';
  cards.forEach((x) => {
    const div = document.createElement('div');
    const top = x.b.indexOf(Math.max(...x.b));
    div.innerHTML = `<canvas></canvas><small><b>${x.name}</b> · from ${cardinal(top * 22.5)} (${Math.round((x.b[top] / x.total) * 100)}%)</small>`;
    roses.appendChild(div);
    drawRose(div.querySelector('canvas'), x.b);
  });
}

// ── Who's signed in: role-aware header links ─────────────────────────────────
(async function roleAwareHeader() {
  try {
    const me = await getJSON('/api/dashboard/me');
    const right = document.querySelector('.header-right');
    if (!right) return;
    const settings = right.querySelector('a[href="/dashboard/settings"]');
    if (me.role !== 'admin' && settings) settings.remove();
    const acct = document.createElement('a');
    acct.href = '/dashboard/account'; acct.className = 'logout'; acct.textContent = me.role === 'admin' ? 'Account & Users' : 'Account';
    acct.title = `Signed in as ${me.username} (${me.role})`;
    (settings && me.role === 'admin' ? settings : right.querySelector('a[href="/dashboard/logout"]'))?.before(acct);
    const nm = $('stationName');
    if (nm && !nm.textContent) nm.textContent = me.username;
    window.DASH_USER = me;
  } catch {}
})();

// ── Data refresh ─────────────────────────────────────────────────────────────
async function refreshData() {
  try {
    const [daily, recent] = await Promise.all([
      getJSON('/api/station/daily').catch(() => []),
      getJSON('/api/station/history?range=2d').catch(() => []),
    ]);
    DAILY = daily; RECENT = recent;
    LATEST = RECENT[RECENT.length - 1] || null;
    if (LATEST?.tz) TZ = LATEST.tz;
    if (!LOC) {
      const loc = await getJSON('/api/dashboard/location').catch(() => null);
      if (loc && num(loc.lat) != null) {
        LOC = loc; window.STATION_LOC = loc;
        if (typeof loadHistory === 'function') loadHistory(currentRange); // redraw so clear-sky overlay appears
      }
    }
    renderNowExtras();
    rendered.rain = rendered.cal = rendered.insights = false;
    renderTab(activeTab());
  } catch (e) { if (e && e.message !== 'auth') console.error('[dashboard-ui]', e); }
}

document.getElementById('refreshBtn')?.addEventListener('click', refreshData);
setInterval(refreshData, 120000);

let initial = location.hash.slice(1);
if (!TABS.includes(initial)) { try { initial = sessionStorage.getItem('dashTab') || 'now'; } catch { initial = 'now'; } }
setTab(initial, false);
refreshData();
})();