const fmtPct1 = new Intl.NumberFormat("fr-CA", { minimumFractionDigits: 1, maximumFractionDigits: 1 });
const fmtPct0 = new Intl.NumberFormat("fr-CA", { maximumFractionDigits: 0 });
const fmtInt = new Intl.NumberFormat("fr-CA");

export function pct(v: number | null | undefined, digits: 0 | 1 = 1, suffix = " %"): string {
  if (v === null || v === undefined || Number.isNaN(v)) return "—";
  return (digits === 1 ? fmtPct1 : fmtPct0).format(v) + suffix;
}
export function prob(p: number | null | undefined): string {
  if (p === null || p === undefined) return "—";
  if (p > 0.995) return "> 99 %";
  if (p < 0.005) return "< 1 %";
  return fmtPct0.format(p * 100) + " %";
}
export function delta(v: number | null | undefined, digits: 0 | 1 = 1, suffix = ""): string {
  if (v === null || v === undefined || Number.isNaN(v)) return "—";
  const f = (digits === 1 ? fmtPct1 : fmtPct0).format(Math.abs(v));
  if (Math.abs(v) < (digits === 1 ? 0.05 : 0.5)) return "0" + suffix;
  return (v > 0 ? "+" : "−") + f + suffix;
}
export function int(v: number | null | undefined): string {
  if (v === null || v === undefined) return "—";
  return fmtInt.format(Math.round(v));
}
export function dateFr(iso: string | null | undefined, opts: Intl.DateTimeFormatOptions = { day: "numeric", month: "long", year: "numeric" }): string {
  if (!iso) return "—";
  const d = iso.length === 10 ? new Date(iso + "T12:00:00") : new Date(iso);
  return new Intl.DateTimeFormat("fr-CA", { timeZone: "America/Toronto", ...opts }).format(d);
}
export function dateShort(iso: string | null | undefined): string {
  return dateFr(iso, { day: "numeric", month: "short" });
}
export function dateTimeFr(iso: string | null | undefined): string {
  if (!iso) return "—";
  return new Intl.DateTimeFormat("fr-CA", { timeZone: "America/Toronto", day: "numeric", month: "long", hour: "2-digit", minute: "2-digit" }).format(new Date(iso));
}
export function timeFr(iso: string | null | undefined): string {
  if (!iso) return "—";
  return new Intl.DateTimeFormat("fr-CA", { timeZone: "America/Toronto", hour: "2-digit", minute: "2-digit", second: "2-digit" }).format(new Date(iso));
}
export function relTime(iso: string | null | undefined): string {
  if (!iso) return "—";
  const s = Math.round((Date.now() - new Date(iso).getTime()) / 1000);
  if (s < 60) return `il y a ${s} s`;
  if (s < 3600) return `il y a ${Math.round(s / 60)} min`;
  if (s < 86400) return `il y a ${Math.round(s / 3600)} h`;
  return `il y a ${Math.round(s / 86400)} j`;
}
export function daysLabel(d: number): string {
  if (d > 0) return `J-${d}`;
  if (d === 0) return "JOUR J";
  return `J+${-d}`;
}
export function ratingLabel(r: string | null | undefined): string {
  return ({ safe: "Acquis", likely: "Probable", lean: "Favori fragile", tossup: "Serré" } as Record<string, string>)[r ?? ""] ?? "—";
}
export function statusLabel(s: string | null | undefined): string {
  return ({ NOT_STARTED: "En attente", REPORTING: "Dépouillement", LEADING: "En avance", PROJECTED: "Projeté QC26", ELECTED: "Élu·e", FINAL: "Final" } as Record<string, string>)[s ?? ""] ?? "—";
}
export function modeLabel(m: string | null | undefined): string {
  return ({ web: "Web", phone: "Téléphone", ivr: "IVR (automatisé)", mixed: "Mixte", sms: "SMS", unknown: "Non précisé" } as Record<string, string>)[m ?? ""] ?? (m ?? "—");
}
export function cls(...xs: (string | false | null | undefined)[]): string {
  return xs.filter(Boolean).join(" ");
}