import type { Account, PeerView } from "#lib/api/types.js";
import { t } from "#lib/i18n/locale.svelte.js";

const PEER_COLOR_COUNT = 7;

export function peerColorIndex(id: number): number {
  return Math.abs(id) % PEER_COLOR_COUNT;
}

export function peerName(peer: PeerView | null): string {
  if (!peer) {
    return "";
  }
  if (peer.is_deleted_account) {
    return t("chat.deletedAccount");
  }
  const parts = [peer.first_name, peer.last_name].filter(Boolean);
  if (parts.length > 0) {
    return parts.join(" ");
  }
  if (peer.username) {
    return `@${peer.username}`;
  }
  return t("chat.deletedAccount");
}

export function accountName(account: Account): string {
  return (
    account.label ??
    account.phone ??
    String(account.tg_user_id ?? account.account_id)
  );
}

const WHITESPACE = /\s+/;

export function initials(name: string): string {
  const words = name.trim().split(WHITESPACE).filter(Boolean);
  if (words.length === 0) {
    return "?";
  }
  const first = words[0].charAt(0);
  if (words.length === 1) {
    return first.toUpperCase();
  }
  const lastWord = words.at(-1);
  const last = lastWord ? lastWord[0] : "";
  return (first + last).toUpperCase();
}

export function formatPhone(phone: string): string {
  return phone.startsWith("+") ? phone : `+${phone}`;
}