require_relative 'iban/validator'
require_relative 'swift_bic/bank_db'
require_relative 'ibanizator/bank_db'
require_relative 'ibanizator/bank'

class Ibanizator
  def self.bank_db
    @bank_db ||= BankDb.new
  end

  def calculate_iban options
    # Error handling
    # TODO

    # delete spaces
    validator                = Iban::Validator.new
    options[:account_number] = validator.sanitize_input(options[:account_number])
    options[:bank_code]      = validator.sanitize_input(options[:bank_code])

    # Fill account number to 10 digits
    while options[:account_number].size < 10 do
      options[:account_number] = options[:account_number].rjust(10, '0')
    end

    country_code_num = character_to_digit options[:country_code].to_s
    checksum = calculate_checksum options[:bank_code], options[:account_number], country_code_num

    options[:country_code].to_s.upcase + checksum + options[:bank_code] + options[:account_number]
  end

  def validate_iban iban
    # for the sake of compatibility
    validator = Iban::Validator.new
    validator.validate_iban(iban)
  end

  # <b>DEPRECATED:</b> Please use <tt>Ibanizator.bank_db.bank_by_bank_code</tt> instead.
  def bic bank_code
    warn "[DEPRECATION] `Ibanizator#bank_name` is deprecated.  Please use `Ibanizator::bank_db.bank_by_bank_code` instead."
    bank_db = SwiftBic::BankDb.new bank_code
    bank_db.bic
  end

  # <b>DEPRECATED:</b> Please use <tt>Ibanizator.bank_db.bank_by_bank_code</tt> instead.
  def bank_name bank_code
    warn "[DEPRECATION] `Ibanizator#bank_name` is deprecated.  Please use `Ibanizator::bank_db.bank_by_bank_code` instead."
    bank_db = SwiftBic::BankDb.new bank_code
    bank_db.bank_name
  end

  def character_to_digit char
    char.upcase.split('').inject('') { |code, c| code + (c.ord - 55).to_s }
  end

  def calculate_checksum bank_code, account_number, country_code_num
    x = (bank_code + account_number + country_code_num + '00').to_i % 97
    checksum = (98 - x).to_s
    checksum.length == 1 ? checksum.insert(0, '0') : checksum
  end
end