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

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

export function getCalendarNameFromUrl(icsUrl: string | null | undefined): string | null {
  if (!icsUrl) return null;
  try {
    const url = new URL(icsUrl);
    const pathname = url.pathname;
    const filename = pathname.split('/').pop() || '';
    // Decode URL encoding (e.g., %20 -> space) and remove .ics extension
    const decoded = decodeURIComponent(filename).replace(/\.ics$/i, '');
    return decoded || null;
  } catch {
    return null;
  }
}

export function getAvatarColor(name?: string): string {
  const colors = [
    'hsl(var(--tag-green))',
    'hsl(var(--tag-blue))',
    'hsl(var(--tag-orange))',
    'hsl(var(--tag-purple))',
    'hsl(var(--tag-brown))',
  ];

  if (!name) return colors[0];

  const hash = name.split('').reduce((acc, char) => acc + char.charCodeAt(0), 0);
  return colors[hash % colors.length];
}