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frontend/lib/thresholds.ts

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+/**
+ * Centralised operational thresholds.
+ * Import from here instead of hardcoding values in individual pages.
+ */
+export const THRESHOLDS = {
+  temp: {
+    warn: 26,      // °C
+    critical: 28,  // °C
+  },
+  humidity: {
+    low: 30,       // % RH — static risk below this
+    warn: 65,      // % RH
+    critical: 80,  // % RH
+  },
+  dewPoint: {
+    warn: 15,      // °C — condensation risk zone
+  },
+  power: {
+    warn: 0.75,    // fraction of rated capacity
+    critical: 0.85,
+  },
+  rackPower: {
+    warn: 7.5,     // kW per rack
+    critical: 9.5, // kW per rack
+    rated: 10,     // kW per rack (default rated capacity)
+  },
+  filter: {
+    warn: 80,      // Pa differential pressure
+    critical: 120, // Pa
+    ratePerDay: 1.2, // Pa/day assumed fouling rate
+    replaceAt: 120,  // Pa
+  },
+  cop: {
+    warn: 1.5,     // COP below this is inefficient
+  },
+  compressor: {
+    warn: 0.80,    // fraction of capacity
+    critical: 0.95,
+  },
+  battery: {
+    warn: 30,      // % state of charge
+    critical: 20,  // %
+  },
+  fuel: {
+    warn: 30,      // % fuel level
+    critical: 15,  // %
+  },
+  ups: {
+    loadWarn: 0.75,     // fraction of rated load
+    loadCritical: 0.90,
+  },
+  pue: {
+    target: 1.4,
+    warn: 1.6,
+    critical: 2.0,
+  },
+  phaseImbalance: {
+    warn: 5,       // %
+    critical: 15,  // %
+  },
+  network: {
+    cpuWarn: 70,       // %
+    cpuCritical: 90,   // %
+    memWarn: 70,       // %
+    memCritical: 85,   // %
+    tempWarn: 55,      // °C
+    tempCritical: 70,  // °C
+  },
+  ashrae: {
+    // ASHRAE A1 Class envelope
+    tempMin: 15,   // °C
+    tempMax: 32,   // °C
+    rhMin: 20,     // %
+    rhMax: 80,     // %
+  },
+} as const;
+
+/** Colour helper: returns a Tailwind text/bg colour token based on a value vs warn/critical pair */
+export function severityColor(
+  value: number,
+  warn: number,
+  critical: number,
+  invert = false, // set true when lower is worse (e.g. battery %)
+): "green" | "amber" | "red" {
+  if (invert) {
+    if (value <= critical) return "red";
+    if (value <= warn) return "amber";
+    return "green";
+  }
+  if (value >= critical) return "red";
+  if (value >= warn) return "amber";
+  return "green";
+}
+
+export const COLOR_CLASSES = {
+  green: {
+    text: "text-green-400",
+    bg: "bg-green-500/15",
+    border: "border-green-500/30",
+    badge: "bg-green-500/20 text-green-300",
+  },
+  amber: {
+    text: "text-amber-400",
+    bg: "bg-amber-500/15",
+    border: "border-amber-500/30",
+    badge: "bg-amber-500/20 text-amber-300",
+  },
+  red: {
+    text: "text-red-400",
+    bg: "bg-red-500/15",
+    border: "border-red-500/30",
+    badge: "bg-red-500/20 text-red-300",
+  },
+} as const;