class Faker::Bank

def iban(legacy_country_code = NOT_GIVEN, country_code: 'GB')
  # Each country has it's own format for bank accounts
  # Many of them use letters in certain parts of the account
  # Using regex patterns we can create virtually any type of bank account
  warn_for_deprecated_arguments do |keywords|
    keywords << :country_code if legacy_country_code != NOT_GIVEN
  end
  begin
    pattern = fetch("bank.iban_details.#{country_code.downcase}.bban_pattern")
  rescue I18n::MissingTranslationData
    raise ArgumentError, "Could not find iban details for #{country_code}"
  end
  # Use Faker::Base.regexify for creating a sample from bank account format regex
  account = Base.regexify(/#{pattern}/)
  # Add country code and checksum to the generated account to form valid IBAN
  country_code.upcase + iban_checksum(country_code, account) + account
end