import { clsx, type ClassValue } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export function formatDate(date?: string | null): string {
  if (!date) return "—";
  return new Date(date).toLocaleDateString("en-US", {
    year: "numeric",
    month: "short",
    day: "numeric",
  });
}

export function billLabel(billType: string, billNumber: number): string {
  const labels: Record<string, string> = {
    hr: "H.R.",
    s: "S.",
    hjres: "H.J.Res.",
    sjres: "S.J.Res.",
    hconres: "H.Con.Res.",
    sconres: "S.Con.Res.",
    hres: "H.Res.",
    sres: "S.Res.",
  };
  return `${labels[billType?.toLowerCase()] ?? billType?.toUpperCase()} ${billNumber}`;
}

export function partyColor(party?: string): string {
  if (!party) return "text-muted-foreground";
  const p = party.toLowerCase();
  if (p.includes("democrat") || p === "d") return "text-blue-500";
  if (p.includes("republican") || p === "r") return "text-red-500";
  return "text-yellow-500";
}

export function partyBadgeColor(party?: string): string {
  if (!party) return "bg-muted text-muted-foreground";
  const p = party.toLowerCase();
  if (p.includes("democrat") || p === "d") return "bg-blue-600 text-white";
  if (p.includes("republican") || p === "r") return "bg-red-600 text-white";
  return "bg-slate-500 text-white";
}

export function congressLabel(congress: number): string {
  const lastTwo = congress % 100;
  if (lastTwo >= 11 && lastTwo <= 13) return `${congress}th Congress`;
  const suffixes: Record<number, string> = { 1: "st", 2: "nd", 3: "rd" };
  return `${congress}${suffixes[congress % 10] ?? "th"} Congress`;
}

export function chamberBadgeColor(chamber?: string): string {
  if (!chamber) return "bg-muted text-muted-foreground";
  const c = chamber.toLowerCase();
  if (c === "senate") return "bg-amber-100 text-amber-700 dark:bg-amber-900/30 dark:text-amber-400";
  if (c.startsWith("house")) return "bg-slate-100 text-slate-600 dark:bg-slate-700/50 dark:text-slate-300";
  return "bg-muted text-muted-foreground";
}

export function trendColor(score?: number): string {
  if (!score) return "text-muted-foreground";
  if (score >= 70) return "text-red-500";
  if (score >= 40) return "text-yellow-500";
  return "text-green-500";
}