{% extends "base.html" %}
{% block title %}Link Debug – GANDALF{% endblock %}

{% block content %}

<div class="g-page-header">
  <h1 class="g-page-title">Link Debug</h1>
  <p class="g-page-sub">
    Per-interface stats: speed, duplex, SFP optical levels, TX/RX rates, errors, and carrier changes.
    Data collected via Prometheus node_exporter + SSH ethtool (servers) and UniFi API (switches) every poll cycle.
    <span id="links-updated" style="margin-left:10px; color:var(--text-muted); font-size:.85em;"></span>
  </p>
</div>

<div id="links-container">
  <div class="link-loading">Loading link statistics</div>
</div>

{% endblock %}

{% block scripts %}
<script>
const escHtml = s => lt.escHtml(s);

// ── Formatting helpers ────────────────────────────────────────────
function fmtRate(bytesPerSec) {
  if (bytesPerSec === null || bytesPerSec === undefined) return '–';
  const bps = bytesPerSec * 8;
  if (bps < 1e3)  return bps.toFixed(0) + ' bps';
  if (bps < 1e6)  return (bps/1e3).toFixed(1) + ' Kbps';
  if (bps < 1e9)  return (bps/1e6).toFixed(2) + ' Mbps';
  return (bps/1e9).toFixed(3) + ' Gbps';
}

function fmtRateBar(bytesPerSec, linkSpeedMbps) {
  if (!linkSpeedMbps || linkSpeedMbps <= 0) return 0;
  const mbps = (bytesPerSec * 8) / 1e6;
  return Math.min(100, (mbps / linkSpeedMbps) * 100);
}

function fmtSpeed(mbps) {
  if (mbps === null || mbps === undefined) return '–';
  if (mbps >= 1000) return (mbps/1000).toFixed(0) + ' Gbps';
  return mbps + ' Mbps';
}

function fmtDuplex(d) {
  if (!d) return '–';
  return d.charAt(0).toUpperCase() + d.slice(1);
}

function fmtTemp(c) {
  if (c === null || c === undefined) return '–';
  return c.toFixed(1) + ' °C';
}

function fmtVoltage(v) {
  if (v === null || v === undefined) return '–';
  return v.toFixed(2) + ' V';
}

function fmtPower(dbm) {
  if (dbm === null || dbm === undefined) return '–';
  return dbm.toFixed(2) + ' dBm';
}

function fmtBias(ma) {
  if (ma === null || ma === undefined) return '–';
  return ma.toFixed(2) + ' mA';
}

function fmtErrors(rate) {
  if (rate === null || rate === undefined) return '–';
  if (rate < 0.001) return '<span class="val-good">0 /s</span>';
  return `<span class="val-crit">${rate.toFixed(3)} /s</span>`;
}

function fmtCarrier(n) {
  if (n === null || n === undefined) return '–';
  if (n === 0) return '<span class="counter-zero">0</span>';
  return `<span class="counter-nonzero">${n}</span>`;
}

// ── SFP/DOM value classification ─────────────────────────────────
function rxPowerClass(dbm) {
  if (dbm === null || dbm === undefined) return 'val-neutral';
  if (dbm < -15) return 'val-crit';
  if (dbm < -10) return 'val-warn';
  return 'val-good';
}
function txPowerClass(dbm) {
  if (dbm === null || dbm === undefined) return 'val-neutral';
  if (dbm < -5) return 'val-crit';
  return 'val-good';
}
function tempClass(c) {
  if (c === null || c === undefined) return 'val-neutral';
  if (c > 80) return 'val-crit';
  if (c > 70) return 'val-warn';
  return 'val-good';
}
function voltageClass(v) {
  if (v === null || v === undefined) return 'val-neutral';
  if (v < 3.0 || v > 3.6) return 'val-crit';
  if (v < 3.1 || v > 3.5) return 'val-warn';
  return 'val-good';
}

function errorBadges(d) {
  const badges = [];
  if ((d.tx_errs_rate || 0) > 0.001 || (d.rx_errs_rate || 0) > 0.001)
    badges.push('<span class="link-alert-badge">ERR</span>');
  if ((d.tx_drops_rate || 0) > 0.001 || (d.rx_drops_rate || 0) > 0.001)
    badges.push('<span class="link-alert-badge link-alert-amber">DROP</span>');
  if ((d.carrier_changes || 0) > 3)
    badges.push('<span class="link-alert-badge link-alert-amber">FLAP</span>');
  return badges.join('');
}

// ── Render a single server interface card ─────────────────────────
function renderIfaceCard(ifaceName, d) {
  const isDown   = d.link_detected === false;
  const pt       = (d.port_type || '').toUpperCase();
  const mediaTag = pt === 'FIBRE' || pt === 'SFP' || pt.includes('FIBRE') ? 'type-fibre'
                 : pt === 'DA' ? 'type-da'
                 : 'type-copper';
  const mediaLabel = d.port_type || '–';
  const speedStr   = d.speed_mbps ? fmtSpeed(d.speed_mbps) : '–';
  const txPct      = fmtRateBar(d.tx_bytes_rate, d.speed_mbps);
  const rxPct      = fmtRateBar(d.rx_bytes_rate, d.speed_mbps);

  let sfpHtml = '';
  if (d.sfp && Object.keys(d.sfp).length > 0) {
    const s = d.sfp;
    const rxClass  = rxPowerClass(s.rx_power_dbm);
    const txClass  = txPowerClass(s.tx_power_dbm);
    const tmpClass = tempClass(s.temp_c);
    const vClass   = voltageClass(s.voltage_v);
    const rxPct2   = s.rx_power_dbm != null ? Math.min(100, Math.max(0, (s.rx_power_dbm + 20) / 15 * 100)) : 0;
    const txPct2   = s.tx_power_dbm != null ? Math.min(100, Math.max(0, (s.tx_power_dbm + 10) / 8  * 100)) : 0;

    sfpHtml = `
      <div class="sfp-panel">
        <div class="sfp-vendor-row">
          ${s.vendor ? `<span>${escHtml(s.vendor)}</span>` : ''}
          ${s.part_no ? ` / <span>${escHtml(s.part_no)}</span>` : ''}
        </div>
        <div class="sfp-grid">
          <div class="sfp-stat">
            <span class="sfp-stat-label">Temp</span>
            <span class="sfp-stat-value ${tmpClass}">${fmtTemp(s.temp_c)}</span>
          </div>
          <div class="sfp-stat">
            <span class="sfp-stat-label">Voltage</span>
            <span class="sfp-stat-value ${vClass}">${fmtVoltage(s.voltage_v)}</span>
          </div>
          <div class="sfp-stat">
            <span class="sfp-stat-label">Bias</span>
            <span class="sfp-stat-value">${fmtBias(s.bias_ma)}</span>
          </div>
          <div class="sfp-stat">
            <span class="sfp-stat-label">TX Power</span>
            <span class="sfp-stat-value ${txClass}">${fmtPower(s.tx_power_dbm)}</span>
            <div class="power-row">
              <div class="power-track"><div class="power-fill ${txClass === 'val-good' ? 'power-ok' : txClass === 'val-warn' ? 'power-warn' : 'power-crit'}" style="width:${txPct2}%"></div></div>
            </div>
          </div>
          <div class="sfp-stat">
            <span class="sfp-stat-label">RX Power</span>
            <span class="sfp-stat-value ${rxClass}">${fmtPower(s.rx_power_dbm)}</span>
            <div class="power-row">
              <div class="power-track"><div class="power-fill ${rxClass === 'val-good' ? 'power-ok' : rxClass === 'val-warn' ? 'power-warn' : 'power-crit'}" style="width:${rxPct2}%"></div></div>
            </div>
          </div>
          ${s.rx_power_dbm != null && s.tx_power_dbm != null ? `
          <div class="sfp-stat">
            <span class="sfp-stat-label">RX−TX Δ</span>
            <span class="sfp-stat-value">${(s.rx_power_dbm - s.tx_power_dbm).toFixed(2)} dBm</span>
          </div>` : ''}
        </div>
      </div>`;
  }

  return `
    <div class="link-iface-card ${isDown ? 'port-down' : ''}">
      <div class="link-iface-header">
        <span class="link-iface-name">${escHtml(ifaceName)}</span>
        <span class="link-iface-speed">${speedStr}</span>
        <span class="link-iface-type ${mediaTag}">${escHtml(mediaLabel)}</span>
        ${errorBadges(d)}
      </div>
      <div class="link-stats-grid">
        <div class="link-stat">
          <span class="link-stat-label">Link</span>
          <span class="link-stat-value ${isDown ? 'val-crit' : 'val-good'}">${isDown ? 'DOWN' : 'UP'}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">Duplex</span>
          <span class="link-stat-value">${fmtDuplex(d.duplex)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">Auto-neg</span>
          <span class="link-stat-value">${d.auto_neg == null ? '–' : d.auto_neg ? 'On' : 'Off'}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">Carrier Δ</span>
          <span class="link-stat-value">${fmtCarrier(d.carrier_changes)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">TX Err/s</span>
          <span class="link-stat-value">${fmtErrors(d.tx_errs_rate)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">RX Err/s</span>
          <span class="link-stat-value">${fmtErrors(d.rx_errs_rate)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">TX Drop/s</span>
          <span class="link-stat-value">${fmtErrors(d.tx_drops_rate)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">RX Drop/s</span>
          <span class="link-stat-value">${fmtErrors(d.rx_drops_rate)}</span>
        </div>
      </div>
      <div class="traffic-section">
        <div class="traffic-row">
          <span class="traffic-label">TX</span>
          <div class="traffic-bar-track"><div class="traffic-bar-fill traffic-tx" style="width:${txPct}%"></div></div>
          <span class="traffic-value">${fmtRate(d.tx_bytes_rate)}</span>
        </div>
        <div class="traffic-row">
          <span class="traffic-label">RX</span>
          <div class="traffic-bar-track"><div class="traffic-bar-fill traffic-rx" style="width:${rxPct}%"></div></div>
          <span class="traffic-value">${fmtRate(d.rx_bytes_rate)}</span>
        </div>
      </div>
      ${sfpHtml}
    </div>`;
}

// ── Render a single UniFi switch port card ────────────────────────
function renderPortCard(portName, d) {
  const isDown   = !d.up;
  const speedStr = d.speed_mbps ? fmtSpeed(d.speed_mbps) : '–';
  const txPct    = fmtRateBar(d.tx_bytes_rate, d.speed_mbps);
  const rxPct    = fmtRateBar(d.rx_bytes_rate, d.speed_mbps);
  const numBadge = d.port_idx != null ? `<span class="port-badge port-badge-num">#${d.port_idx}</span>` : '';
  const uplinkBadge = d.is_uplink ? `<span class="port-badge port-badge-uplink">UPLINK</span>` : '';
  const poeBadge    = d.poe_power ? `<span class="port-badge port-badge-poe">PoE ${d.poe_power.toFixed(1)}W</span>` : '';
  const lldpLine  = d.lldp ? `<div class="port-lldp">→ ${escHtml(d.lldp.system_name || '')} (${escHtml(d.lldp.port_id || '')})</div>` : '';
  const poeLine   = d.poe_class ? `<div class="port-poe-info">PoE ${escHtml(d.poe_class)} · max ${d.poe_max_power != null ? d.poe_max_power.toFixed(1)+'W' : '–'}</div>` : '';

  return `
    <div class="link-iface-card ${isDown ? 'port-down' : ''}">
      <div class="link-iface-header">
        <span class="link-iface-name">${numBadge} ${escHtml(portName)}</span>
        <span class="link-iface-speed">${speedStr}</span>
        ${uplinkBadge}${poeBadge}
        ${errorBadges(d)}
      </div>
      ${lldpLine}${poeLine}
      <div class="link-stats-grid">
        <div class="link-stat">
          <span class="link-stat-label">Link</span>
          <span class="link-stat-value ${isDown ? 'val-crit' : 'val-good'}">${isDown ? 'DOWN' : 'UP'}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">Duplex</span>
          <span class="link-stat-value">${d.full_duplex == null ? '–' : d.full_duplex ? 'Full' : 'Half'}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">Auto-neg</span>
          <span class="link-stat-value">${d.autoneg == null ? '–' : d.autoneg ? 'On' : 'Off'}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">TX Err/s</span>
          <span class="link-stat-value">${fmtErrors(d.tx_errs_rate)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">RX Err/s</span>
          <span class="link-stat-value">${fmtErrors(d.rx_errs_rate)}</span>
        </div>
        <div class="link-stat">
          <span class="link-stat-label">TX Drop/s</span>
          <span class="link-stat-value">${fmtErrors(d.tx_drops_rate)}</span>
        </div>
      </div>
      <div class="traffic-section">
        <div class="traffic-row">
          <span class="traffic-label">TX</span>
          <div class="traffic-bar-track"><div class="traffic-bar-fill traffic-tx" style="width:${txPct}%"></div></div>
          <span class="traffic-value">${fmtRate(d.tx_bytes_rate)}</span>
        </div>
        <div class="traffic-row">
          <span class="traffic-label">RX</span>
          <div class="traffic-bar-track"><div class="traffic-bar-fill traffic-rx" style="width:${rxPct}%"></div></div>
          <span class="traffic-value">${fmtRate(d.rx_bytes_rate)}</span>
        </div>
      </div>
    </div>`;
}

// ── Render all UniFi switches ─────────────────────────────────────
function renderUnifiSwitches(unifiSwitches, dataUpdated) {
  if (!unifiSwitches || !Object.keys(unifiSwitches).length) return '';
  const updStr = dataUpdated
    ? new Date(dataUpdated.replace(' UTC', 'Z').replace(' ', 'T')).toLocaleTimeString()
    : '';
  const html = Object.entries(unifiSwitches).map(([swName, sw]) => {
    const ports = sw.ports || {};
    const portValues = Object.values(ports);
    const portCards = Object.entries(ports)
      .sort(([,a],[,b]) => (a.port_idx||0) - (b.port_idx||0))
      .map(([pname, d]) => renderPortCard(pname, d)).join('');
    const poe_total_w = portValues.reduce((s, p) => s + (p.poe_power || 0), 0);
    const poe_max_w   = portValues.reduce((s, p) => s + (p.poe_max_power || 0), 0);
    const poeLoad = poe_total_w > 0 ? ` · PoE ${poe_total_w.toFixed(1)}W` : '';

    // PoE utilisation bar
    let poebar = '';
    if (poe_total_w > 0 && poe_max_w > 0) {
      const pct = Math.min(100, (poe_total_w / poe_max_w) * 100);
      const cls = pct > 80 ? 'poe-bar-crit' : pct > 60 ? 'poe-bar-warn' : 'poe-bar-ok';
      poebar = `<div class="poe-bar-track"><div class="poe-bar-fill ${cls}" style="width:${pct}%"></div></div>`;
    }

    return `
      <div class="link-host-panel" id="panel-${CSS.escape(swName)}">
        <div class="link-host-title" data-action="toggle-panel">
          <span class="link-host-name">${escHtml(swName)}</span>
          <span class="link-host-ip">${escHtml(sw.ip || '')}</span>
          <span class="link-host-upd">${escHtml(sw.model || '')}${updStr ? ' · ' + updStr : ''}${poeLoad}</span>
          ${poebar}
          <span class="panel-toggle">[–]</span>
        </div>
        <div class="link-ifaces-grid">${portCards}</div>
      </div>`;
  }).join('');

  return `<div class="unifi-section-header">UNIFI SWITCH PORTS</div>${html}`;
}

// ── Panel collapse / expand ───────────────────────────────────────
function togglePanel(panel) {
  panel.classList.toggle('collapsed');
  const btn = panel.querySelector('.panel-toggle');
  if (btn) btn.textContent = panel.classList.contains('collapsed') ? '[+]' : '[–]';
  const id = panel.id;
  if (id) {
    const collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}');
    collapsed[id] = panel.classList.contains('collapsed');
    sessionStorage.setItem('linksCollapsed', JSON.stringify(collapsed));
  }
}

function restoreCollapseState() {
  const collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}');
  for (const [id, isCollapsed] of Object.entries(collapsed)) {
    const panel = document.getElementById(id);
    if (!panel) continue;
    if (isCollapsed) {
      panel.classList.add('collapsed');
      const btn = panel.querySelector('.panel-toggle');
      if (btn) btn.textContent = '[+]';
    }
  }
}

// ── Build summary stats header ────────────────────────────────────
function buildLinkSummary(hosts, unifiSwitches) {
  let totalIfaces = 0, downIfaces = 0, errIfaces = 0, totalPoe = 0;
  for (const ifaces of Object.values(hosts || {})) {
    for (const d of Object.values(ifaces)) {
      totalIfaces++;
      if (d.link_detected === false) downIfaces++;
      if ((d.tx_errs_rate || 0) > 0 || (d.rx_errs_rate || 0) > 0) errIfaces++;
    }
  }
  for (const sw of Object.values(unifiSwitches || {})) {
    for (const p of Object.values(sw.ports || {})) {
      totalPoe += p.poe_power || 0;
    }
  }
  const hasAlerts = downIfaces > 0 || errIfaces > 0;
  return `
    <div class="link-summary-panel ${hasAlerts ? 'link-summary-has-alerts' : ''}">
      <div class="link-summary-grid">
        <div class="link-summary-stat">
          <span class="lss-label">Total Interfaces</span>
          <span class="lss-value">${totalIfaces}</span>
        </div>
        <div class="link-summary-stat ${downIfaces ? 'lss-alert' : ''}">
          <span class="lss-label">Interfaces Down</span>
          <span class="lss-value ${downIfaces ? 'val-crit' : 'val-good'}">${downIfaces}</span>
        </div>
        <div class="link-summary-stat ${errIfaces ? 'lss-alert' : ''}">
          <span class="lss-label">With Errors</span>
          <span class="lss-value ${errIfaces ? 'val-warn' : 'val-good'}">${errIfaces}</span>
        </div>
        ${totalPoe > 0 ? `
        <div class="link-summary-stat">
          <span class="lss-label">PoE Load</span>
          <span class="lss-value">${totalPoe.toFixed(1)} <span class="lss-sub">W</span></span>
        </div>` : ''}
      </div>
    </div>`;
}

// ── Main render ───────────────────────────────────────────────────
function renderLinks(data) {
  const hosts       = data.hosts || {};
  const unifiSwitches = data.unifi_switches || {};
  const parts       = [];

  parts.push(buildLinkSummary(hosts, unifiSwitches));
  parts.push(`<div class="link-collapse-bar">
    <button class="lt-btn lt-btn-ghost lt-btn-sm" data-action="collapse-all">Collapse All</button>
    <button class="lt-btn lt-btn-ghost lt-btn-sm" data-action="expand-all">Expand All</button>
  </div>`);
  parts.push('<div class="link-host-list">');

  for (const [hostname, ifaces] of Object.entries(hosts)) {
    const ifaceCards = Object.entries(ifaces)
      .sort(([a],[b]) => a.localeCompare(b))
      .map(([iname, d]) => renderIfaceCard(iname, d)).join('');
    const sample  = Object.values(ifaces)[0] || {};
    const ip      = sample.host_ip || '';
    const updStr  = sample.updated
      ? new Date(sample.updated + (sample.updated.includes('Z') ? '' : 'Z')).toLocaleTimeString()
      : '';

    parts.push(`
      <div class="link-host-panel" id="panel-${CSS.escape(hostname)}">
        <div class="link-host-title" data-action="toggle-panel">
          <span class="link-host-name">${escHtml(hostname)}</span>
          <span class="link-host-ip">${escHtml(ip)}</span>
          <span class="link-host-upd">${updStr}</span>
          <span class="panel-toggle">[–]</span>
        </div>
        <div class="link-ifaces-grid">${ifaceCards}</div>
      </div>`);
  }

  parts.push(renderUnifiSwitches(unifiSwitches, data.updated));
  parts.push('</div>');
  document.getElementById('links-container').innerHTML = parts.join('');
  restoreCollapseState();
}

function collapseAll() {
  document.querySelectorAll('.link-host-panel').forEach(p => {
    p.classList.add('collapsed');
    const btn = p.querySelector('.panel-toggle');
    if (btn) btn.textContent = '[+]';
  });
  sessionStorage.setItem('linksCollapsed', JSON.stringify(
    Object.fromEntries([...document.querySelectorAll('.link-host-panel')].map(p => [p.id, true]))
  ));
}

function expandAll() {
  document.querySelectorAll('.link-host-panel').forEach(p => {
    p.classList.remove('collapsed');
    const btn = p.querySelector('.panel-toggle');
    if (btn) btn.textContent = '[–]';
  });
  sessionStorage.setItem('linksCollapsed', '{}');
}

// ── Stale data warning ────────────────────────────────────────────
function checkLinksStale(updatedStr) {
  if (!updatedStr) return;
  const age = (Date.now() - new Date(updatedStr + (updatedStr.includes('Z') ? '' : 'Z'))) / 1000;
  let banner = document.getElementById('links-stale-banner');
  if (age > 120) {
    if (!banner) {
      banner = document.createElement('div');
      banner.id = 'links-stale-banner';
      banner.className = 'stale-banner';
      document.getElementById('links-container').prepend(banner);
    }
    banner.textContent = `⚠ Link data may be stale — last updated ${Math.floor(age/60)}m ago.`;
    banner.style.display = '';
  } else if (banner) {
    banner.style.display = 'none';
  }
}

// ── Fetch + render ────────────────────────────────────────────────
async function loadLinks() {
  try {
    const data = await lt.api.get('/api/links');
    if (!data.hosts && !data.unifi_switches) {
      document.getElementById('links-container').innerHTML =
        '<div class="link-no-data">No link data yet — monitor has not completed a full cycle.</div>';
      return;
    }
    const updEl = document.getElementById('links-updated');
    if (updEl && data.updated) {
      updEl.textContent = 'Updated: ' + new Date(data.updated + (data.updated.includes('Z') ? '' : 'Z')).toLocaleTimeString();
    }
    renderLinks(data);
    checkLinksStale(data.updated);
  } catch (e) {
    document.getElementById('links-container').innerHTML =
      '<div class="error-state">Network error loading link statistics.</div>';
    lt.toast.error('Failed to load link statistics');
  }
}

loadLinks();
lt.autoRefresh.start(loadLinks, 60000);

document.addEventListener('click', e => {
  const toggleTitle = e.target.closest('[data-action="toggle-panel"]');
  if (toggleTitle) { togglePanel(toggleTitle.closest('.link-host-panel')); return; }

  if (e.target.closest('[data-action="collapse-all"]')) { collapseAll(); return; }
  if (e.target.closest('[data-action="expand-all"]'))   { expandAll();   return; }
});
</script>
{% endblock %}