export type CounterpartyRoleHint = "ordinary_counterparty" | "bank_or_financial_institution";

const FINANCIAL_INSTITUTION_PATTERNS: RegExp[] = [
  /(?:^|[\s"«(,-])банк(?:$|[\s"»),.-])/u,
  /сбербанк/u,
  /(?:^|[\s"«(,-])сбер(?:$|[\s"»),.-])/u,
  /(?:^|[\s"«(,-])втб(?:$|[\s"»),.-])/u,
  /альфа[\s-]*банк/u,
  /тинькофф/u,
  /(?:^|[\s"«(,-])т[\s-]*банк(?:$|[\s"»),.-])/u,
  /газпромбанк/u,
  /росбанк/u,
  /райффайзен/u,
  /совкомбанк/u,
  /промсвязьбанк/u,
  /(?:^|[\s"«(,-])псб(?:$|[\s"»),.-])/u,
  /(?:^|[\s"«(,-])мкб(?:$|[\s"»),.-])/u,
  /ак[\s-]*барс/u,
  /уралсиб/u,
  /юникредит/u,
  /почта[\s-]*банк/u,
  /(?:^|[\s"«(,-])открытие(?:$|[\s"»),.-])/u,
  /кредитн(?:ая|ый|ое|ые)\s+организац/u
];

function normalizeCounterpartyRoleText(value: unknown): string {
  return String(value ?? "")
    .toLowerCase()
    .replace(/ё/g, "е")
    .replace(/[._]+/g, " ")
    .replace(/\s+/g, " ")
    .trim();
}

export function isLikelyFinancialInstitutionCounterparty(value: unknown): boolean {
  const normalized = normalizeCounterpartyRoleText(value);
  if (!normalized) {
    return false;
  }
  return FINANCIAL_INSTITUTION_PATTERNS.some((pattern) => pattern.test(normalized));
}

export function counterpartyRoleHintForName(value: unknown): CounterpartyRoleHint {
  return isLikelyFinancialInstitutionCounterparty(value)
    ? "bank_or_financial_institution"
    : "ordinary_counterparty";
}