export function renderStorage(state) {
  const storage = state.storage || {};
  const grid = document.getElementById("storage-grid");
  if (!grid) return;

  const root = storage.root || storage.disks?.[0] || null;
  const disks = storage.disks || [];
  const rootPct = root?.usage_percent ?? 0;
  const rootTone = pickTone(rootPct);
  const warningCount = disks.filter((disk) => between(disk.usage_percent, 70, 85)).length;
  const criticalCount = disks.filter((disk) => (disk.usage_percent ?? 0) > 85).length;
  const highest = disks.length
    ? disks.reduce((current, disk) => ((disk.usage_percent ?? 0) > (current.usage_percent ?? 0) ? disk : current), disks[0])
    : null;
  const matrixPill = criticalCount > 0 ? "pill-offline" : warningCount > 0 ? "pill-degraded" : "pill-online";
  const strip = disks.length
    ? disks.slice(0, 4).map((disk) => {
        const pct = disk.usage_percent ?? 0;
        return `<span class="storage-chip" style="color:${pickColor(pct)}">${disk.name || disk.mount} ${pct.toFixed(0)}%</span>`;
      }).join("")
    : '<span class="storage-chip">No disk data</span>';

  grid.innerHTML = `
    <div class="card service-card storage-card storage-primary">
      <div class="card-title">
        <div class="card-title-left">
          <span class="service-icon icon-storage"><span class="icon-glyph glyph-storage"></span></span>
          <span class="service-name">ROOT STORAGE</span>
        </div>
        <span class="status-pill ${statusPill(root?.status)}">${(root?.status || "stable").toUpperCase()}</span>
      </div>
      <div class="stats-grid">
        <div class="stat-block"><div class="stat-num ${rootTone}">${root ? `${rootPct.toFixed(1)}%` : "\u2014"}</div><div class="stat-label">Usage</div></div>
        <div class="stat-block"><div class="stat-num dim">${root ? fmtNum(root.used_gb) : "\u2014"}</div><div class="stat-label">Used GB</div></div>
        <div class="stat-block"><div class="stat-num dim">${root ? fmtNum(root.free_gb) : "\u2014"}</div><div class="stat-label">Free GB</div></div>
      </div>
      <div class="progress-wrap">
        <div class="progress-meta"><span>${root?.mount || "/"}</span><span>${root ? `${rootPct.toFixed(1)}%` : "0%"}</span></div>
        <div class="progress-bar"><div class="progress-fill ${rootTone}" style="width:${Math.min(100, rootPct)}%"></div></div>
      </div>
    </div>
    <div class="card service-card storage-card storage-matrix-card">
      <div class="card-title">
        <div class="card-title-left">
          <span class="service-icon icon-matrix"><span class="icon-glyph glyph-matrix"></span></span>
          <span class="service-name">DISK MATRIX</span>
        </div>
        <span class="status-pill ${matrixPill}">${disks.length}</span>
      </div>
      <div class="stats-grid">
        <div class="stat-block"><div class="stat-num">${disks.length || "\u2014"}</div><div class="stat-label">Volumes</div></div>
        <div class="stat-block"><div class="stat-num warn">${warningCount}</div><div class="stat-label">Warning</div></div>
        <div class="stat-block"><div class="stat-num danger">${criticalCount}</div><div class="stat-label">Critical</div></div>
        <div class="stat-block"><div class="stat-num ${pickTone(highest?.usage_percent ?? 0)}">${highest ? `${(highest.usage_percent ?? 0).toFixed(0)}%` : "\u2014"}</div><div class="stat-label">Peak</div></div>
      </div>
      <div class="service-footer"><span>Mounted Volumes</span><div class="storage-strip">${strip}</div></div>
    </div>
  `;
}

function fmtNum(value) {
  return value == null ? "\u2014" : Number(value).toFixed(1);
}

function between(value, min, max) {
  const num = value ?? 0;
  return num > min && num <= max;
}

function pickTone(pct) {
  if (pct > 85) return "danger";
  if (pct > 70) return "warn";
  return "";
}

function pickColor(pct) {
  if (pct > 85) return "var(--red)";
  if (pct > 70) return "var(--yellow)";
  return "var(--teal-bright)";
}

function statusPill(status) {
  if (status === "critical") return "pill-offline";
  if (status === "warning") return "pill-degraded";
  return "pill-online";
}