'use strict';

/* ── Config from Flask ── */
const ROOT    = document.getElementById('mirror-root');
const POLL_MS = parseInt(ROOT.dataset.pollMs || '2500', 10);
const SENSORS = JSON.parse(ROOT.dataset.sensors || '[]');

/* ── State ── */
let lastLogCount = 0;
let alertsSeen   = 0;
let chartData    = [];    // {ts, v} for temp channel (field_index 0)
let firstPoll    = true;

/* ══════════════════════════════
   CLOCK
══════════════════════════════ */
const DAYS   = ['Sonntag','Montag','Dienstag','Mittwoch','Donnerstag','Freitag','Samstag'];
const MONTHS = ['Januar','Februar','März','April','Mai','Juni',
                'Juli','August','September','Oktober','November','Dezember'];

function tickClock() {
  const n = new Date();
  const pad = x => String(x).padStart(2, '0');
  document.getElementById('clock-time').textContent =
    `${pad(n.getHours())}:${pad(n.getMinutes())}:${pad(n.getSeconds())}`;
  document.getElementById('clock-date').textContent =
    `${DAYS[n.getDay()]}, ${n.getDate()}. ${MONTHS[n.getMonth()]} ${n.getFullYear()}`;
}
setInterval(tickClock, 1000);
tickClock();

/* ══════════════════════════════
   CANVAS CHART
══════════════════════════════ */
const canvas = document.getElementById('chart');
const ctx    = canvas.getContext('2d');

function resizeCanvas() {
  canvas.width  = canvas.parentElement.clientWidth - 36;
  canvas.height = 130;
}
window.addEventListener('resize', () => { resizeCanvas(); drawChart(); });
resizeCanvas();

function drawChart() {
  const W = canvas.width, H = canvas.height;
  ctx.clearRect(0, 0, W, H);

  const pts = chartData.slice(-80).map(d => d.v);

  if (pts.length < 2) {
    ctx.fillStyle = 'rgba(228,233,245,.15)';
    ctx.font = `11px 'JetBrains Mono', monospace`;
    ctx.fillText('Warte auf Messdaten …', 10, H / 2 + 4);
    return;
  }

  const mn  = Math.min(...pts);
  const mx  = Math.max(...pts);
  const rng = (mx - mn) || 1;
  const sx  = W / (pts.length - 1);
  const yp  = v => H - ((v - mn) / rng) * H * 0.80 - H * 0.10;

  /* grid */
  ctx.strokeStyle = 'rgba(255,255,255,.04)';
  ctx.lineWidth   = 1;
  ctx.font        = `9px 'JetBrains Mono', monospace`;
  for (let i = 0; i <= 4; i++) {
    const y = H - (i / 4) * H * 0.80 - H * 0.10;
    ctx.beginPath(); ctx.moveTo(0, y); ctx.lineTo(W, y); ctx.stroke();
    ctx.fillStyle = 'rgba(228,233,245,.18)';
    ctx.fillText((mn + (i / 4) * rng).toFixed(1) + '°', 4, y - 3);
  }

  /* gradient fill */
  const grd = ctx.createLinearGradient(0, 0, 0, H);
  grd.addColorStop(0, 'rgba(59,130,246,.2)');
  grd.addColorStop(1, 'rgba(59,130,246,.0)');

  ctx.beginPath();
  pts.forEach((v, i) => {
    const x = i * sx, y = yp(v);
    i === 0 ? ctx.moveTo(x, y) : ctx.lineTo(x, y);
  });
  ctx.lineTo((pts.length - 1) * sx, H);
  ctx.lineTo(0, H);
  ctx.closePath();
  ctx.fillStyle = grd;
  ctx.fill();

  /* line */
  ctx.beginPath();
  pts.forEach((v, i) => {
    const x = i * sx, y = yp(v);
    i === 0 ? ctx.moveTo(x, y) : ctx.lineTo(x, y);
  });
  ctx.strokeStyle = '#3b82f6';
  ctx.lineWidth   = 2;
  ctx.shadowColor = 'rgba(59,130,246,.5)';
  ctx.shadowBlur  = 10;
  ctx.stroke();
  ctx.shadowBlur  = 0;

  /* last dot */
  const lv = pts[pts.length - 1];
  const lx = (pts.length - 1) * sx;
  const ly = yp(lv);
  ctx.beginPath();
  ctx.arc(lx, ly, 4, 0, Math.PI * 2);
  ctx.fillStyle   = '#3b82f6';
  ctx.shadowColor = '#3b82f6';
  ctx.shadowBlur  = 14;
  ctx.fill();
  ctx.shadowBlur  = 0;
}

/* ══════════════════════════════
   SENSOR TILES
══════════════════════════════ */
function updateSensorTiles(values) {
  SENSORS.forEach((s, i) => {
    const idx  = s.field_index;
    if (idx >= values.length) return;

    const v    = values[idx];
    const tile = document.getElementById(`sc-${i}`);
    const valEl= document.getElementById(`sv-${i}`);
    if (!tile || !valEl) return;

    const fmt = Number.isInteger(v) ? String(v) : v.toFixed(1);
    valEl.textContent = `${fmt}${s.unit ? ' ' + s.unit : ''}`;

    tile.querySelectorAll('.sensor-alert-badge').forEach(b => b.remove());
    tile.classList.remove('breach-high', 'breach-low');

    const isHigh = s.notify_on_high && s.threshold_high != null && v > s.threshold_high;
    const isLow  = s.notify_on_low  && s.threshold_low  != null && v < s.threshold_low;

    if (isHigh) {
      tile.classList.add('breach-high');
      const b = document.createElement('span');
      b.className   = 'sensor-alert-badge';
      b.textContent = '↑ Überschritten';
      tile.querySelector('.sensor-meta').appendChild(b);
    } else if (isLow) {
      tile.classList.add('breach-low');
      const b = document.createElement('span');
      b.className   = 'sensor-alert-badge low';
      b.textContent = '↓ Unterschritten';
      tile.querySelector('.sensor-meta').appendChild(b);
    }
  });
}

/* ══════════════════════════════
   TABS
══════════════════════════════ */
function switchTab(name) {
  document.querySelectorAll('.tab').forEach(t =>
    t.classList.toggle('active', t.dataset.tab === name));
  document.querySelectorAll('.tab-pane').forEach(p =>
    p.classList.toggle('active', p.id === `pane-${name}`));
  if (name === 'alerts') {
    const b = document.getElementById('alert-badge');
    b.classList.remove('visible');
    b.textContent = '';
  }
}

/* ══════════════════════════════
   POLL
══════════════════════════════ */
async function poll() {
  try {
    const [dataRes, alertRes] = await Promise.all([
      fetch('/api/data'),
      fetch('/api/alerts'),
    ]);
    const data   = await dataRes.json();
    const alerts = await alertRes.json();

    /* Connection badge */
    const badge = document.getElementById('conn-badge');
    const ok    = data.status.connected;
    badge.className = `conn-badge card ${ok ? 'ok' : 'err'}`;
    document.getElementById('conn-text').textContent = ok
      ? `${data.status.port}  ·  ${data.status.baud} Bd`
      : 'Getrennt — warte …';

    /* Stat cards */
    document.getElementById('stat-total').textContent  = data.status.total_lines;
    document.getElementById('stat-errors').textContent = data.status.errors;
    document.getElementById('stat-port').textContent   = data.status.port || '—';
    document.getElementById('stat-baud').textContent   = data.status.baud
      ? `${data.status.baud} baud` : '—';

    if (data.entries.length) {
      const latest = data.entries[data.entries.length - 1];
      const disp   = latest.values?.length
        ? latest.values[0].toFixed(2)
        : latest.raw.slice(0, 14);
      document.getElementById('stat-last').textContent = disp;
      document.getElementById('stat-ts').textContent   = latest.ts.split('T')[1].slice(0,8);

      if (latest.values?.length) {
        updateSensorTiles(latest.values);
        chartData.push({ ts: latest.ts, v: latest.values[0] });
        if (chartData.length > 200) chartData = chartData.slice(-200);
      }
    }

    /* Log — only new entries */
    const newEntries = data.entries.slice(lastLogCount);
    lastLogCount     = data.entries.length;
    const logPane    = document.getElementById('pane-log');

    if (firstPoll && newEntries.length === 0) {
      /* keep placeholder */
    } else if (firstPoll) {
      logPane.innerHTML = '';
      firstPoll = false;
    }

    newEntries.forEach(e => {
      const row   = document.createElement('div');
      row.className = 'log-entry';
      const numStr  = e.values?.map(v => v.toFixed(2)).join('  ') || '';
      row.innerHTML =
        `<span class="log-ts">${e.ts.split('T')[1].slice(0,8)}</span>` +
        `<span class="log-raw">${e.raw}</span>` +
        (numStr ? `<span class="log-num">${numStr}</span>` : '<span></span>');
      logPane.prepend(row);

      /* trim log DOM to 100 rows */
      while (logPane.children.length > 100) {
        logPane.removeChild(logPane.lastChild);
      }
    });

    /* Alerts */
    if (alerts.length > alertsSeen) {
      const newAlerts = alerts.slice(alertsSeen);
      alertsSeen = alerts.length;

      const alertPane = document.getElementById('pane-alerts');
      if (alertsSeen === newAlerts.length) alertPane.innerHTML = '';

      newAlerts.forEach(a => {
        const row = document.createElement('div');
        row.className = 'alert-entry';
        row.innerHTML =
          `<span class="alert-icon">⚠</span>` +
          `<span class="alert-ts">${a.ts.split('T')[1].slice(0,8)}</span>` +
          `<span class="alert-msg">${a.subject}</span>`;
        alertPane.prepend(row);
      });

      const ab = document.getElementById('alert-badge');
      if (!document.getElementById('pane-alerts').classList.contains('active')) {
        ab.textContent = newAlerts.length > 9 ? '9+' : String(newAlerts.length);
        ab.classList.add('visible');
      }
    }

    drawChart();

  } catch (err) {
    console.warn('[Mirror] Poll error:', err);
  }

  setTimeout(poll, POLL_MS);
}

poll();