import { clsx, type ClassValue } from "clsx";

import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]): string {

  return twMerge(clsx(inputs));

}

export function formatPriceRange(

  minCents: number | null,

  maxCents: number | null,

  currency = "USD",

): string {

  if (minCents == null && maxCents == null) return "Price TBA";

  const fmt = new Intl.NumberFormat("en-US", {

    style: "currency",

    currency,

    minimumFractionDigits: 0,

    maximumFractionDigits: minCents != null && minCents % 100 === 0 ? 0 : 2,

  });

  if (minCents != null && maxCents != null && minCents !== maxCents) {

    return `${fmt.format(minCents / 100)} - ${fmt.format(maxCents / 100)}`;

  }

  const single = (minCents ?? maxCents) as number;

  return fmt.format(single / 100);

}

export function formatCompact(n: number): string {

  if (Math.abs(n) >= 10_000) {

    return new Intl.NumberFormat("en-US", { notation: "compact", maximumFractionDigits: 1 }).format(n);

  }

  return new Intl.NumberFormat("en-US").format(n);

}

export function formatLatency(ms: number | null): string {

  if (ms == null) return "-";

  if (ms < 1000) return `${Math.round(ms)}ms`;

  return `${(ms / 1000).toFixed(1)}s`;

}

export function sourceInitials(name: string): string {

  const words = name.replace(/\b(api|discovery)\b/gi, "").trim().split(/\s+/).filter(Boolean);

  if (words.length === 0) return "?";

  if (words.length === 1) return words[0]!.slice(0, 2).toUpperCase();

  return (words[0]![0]! + words[1]![0]!).toUpperCase();

}

export function sourceHue(id: string): number {

  let h = 0;

  for (let i = 0; i < id.length; i += 1) h = (h * 31 + id.charCodeAt(i)) % 360;

  return h;

}