const AVATAR_COLORS = [
  "bg-[#E7F6FD] text-[#0F9FDF]",
  "bg-emerald-100 text-emerald-700",
  "bg-amber-100 text-amber-700",
  "bg-rose-100 text-rose-700",
  "bg-sky-100 text-sky-700",
  "bg-purple-100 text-purple-700",
  "bg-teal-100 text-teal-700",
  "bg-orange-100 text-orange-700",
];

/** Cor determinística a partir do id do contato, para o avatar de iniciais na listagem —
 * o mesmo contato sempre recebe a mesma cor entre renders/páginas. */
export function getAvatarColor(id: string): string {
  let hash = 0;
  for (let i = 0; i < id.length; i++) {
    hash = (hash << 5) - hash + id.charCodeAt(i);
    hash |= 0;
  }
  return AVATAR_COLORS[Math.abs(hash) % AVATAR_COLORS.length];
}

export function getInitials(name: string | null): string {
  if (!name) return "?";
  const parts = name.trim().split(/\s+/);
  if (parts.length === 1) return parts[0].slice(0, 2).toUpperCase();
  return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase();
}