import type { StageTone } from "./stageStatus";

// The line invents no colours. Every value below is one of the semantic tokens
// the repo already carries across the two bases, light and dark
// (common/styles/tokens.css); a bespoke hue here would be wrong on every base
// at once.

export const STATION_DOT: Record<StageTone, string> = {
  // A station with nothing to say is an outline, not a filled dot: "○" in the
  // sketch. Notably this is also where a DISABLED lane lands — see the tone rule
  // in channelFlow.ts.
  neutral: "border border-border-strong bg-transparent",
  ok: "bg-success",
  attention: "bg-warning",
  danger: "bg-destructive",
  // The travelling pulse. The only animated thing on the page.
  running: "bg-info animate-pulse",
};

export const STATION_TEXT: Record<StageTone, string> = {
  neutral: "text-muted-foreground",
  ok: "text-foreground",
  attention: "text-warning",
  danger: "text-destructive",
  running: "text-info",
};

export function formatCount(n: number | null): string {
  // "—", never "0". A zero here would claim a measurement nobody took.
  return n == null ? "—" : n.toLocaleString();
}

export function formatCoverage(coverage: number | null): string {
  if (coverage == null) return "—";
  const pct = coverage * 100;
  // Whole percents once you are past 10% — the third significant figure on
  // "94.37%" is noise at this size. Below that, one decimal, because the
  // difference between 6.8% and 6% is the difference between a sweep that is
  // moving and one that is not.
  return `${pct >= 10 ? Math.round(pct) : Math.round(pct * 10) / 10}%`;
}