/**
 * 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;