/**
 * Shared severity ladder for calls and incidents: routine < minor < moderate < major.
 * Every call/incident gets one of these four. `"unknown"` (and any other
 * unrecognized value) is a legacy value still present on historical docs —
 * treat it as "no severity", not as a fifth level.
 */
import type { ReactElement } from "react";

export type Severity = "routine" | "minor" | "moderate" | "major";

export const SEVERITY_ORDER: Record<Severity, number> = { routine: 0, minor: 1, moderate: 2, major: 3 };
export const SEVERITY_LABEL: Record<Severity, string> = { routine: "Routine", minor: "Minor", moderate: "Moderate", major: "Major" };
export const SEVERITY_COLORS: Record<Severity, string> = {
  routine:  "bg-gray-800/40 text-gray-600",
  minor:    "bg-gray-800 text-gray-400",
  moderate: "bg-orange-950 text-orange-400",
  major:    "bg-red-950 text-red-400",
};

export function isKnownSeverity(s: string | null | undefined): s is Severity {
  return s === "routine" || s === "minor" || s === "moderate" || s === "major";
}

/** Legacy/unset severities rank below `routine` so a recency-sorted list never confuses them with a real (low) severity. */
export function severityRank(s: string | null | undefined): number {
  return isKnownSeverity(s) ? SEVERITY_ORDER[s] : -1;
}

export function severityBadge(severity: string | null | undefined): ReactElement | null {
  if (!isKnownSeverity(severity)) return null;
  return (
    <span className={`text-xs font-mono px-2 py-0.5 rounded-full ${SEVERITY_COLORS[severity]}`}>
      {SEVERITY_LABEL[severity]}
    </span>
  );
}