require "active_model"

module UnionBank
  module ECrediting
    # Describes UnionBank's eCrediting Transaction File's detail line
    class TransactionFile::DetailLine
      include ActiveModel::Model

      AMOUNT_RANGE = BigDecimal("0")..BigDecimal("9999999999.99")

      attr_accessor :payee_id,
                    :ref_number,
                    :amount,
                    :ref_values

      validates :payee_id, length: { maximum: 50 }
      validates :ref_number, length: { maximum: 20 }
      validates :amount, inclusion: { in: AMOUNT_RANGE, message: "must be between 0.00 to 9,999,999,999.99" }

      validates :payee_id,
                :ref_number,
                :amount,
                presence: true

      # @param [String] payee_id
      # @param [Integer] ref_number
      # @param [BigDecimal] amount
      # @param [Array] ref_values
      def initialize(payee_id:, ref_number:, amount:, ref_values: [])
        @payee_id = payee_id
        @ref_number = ref_number
        @amount = BigDecimal(amount.to_s)
        @ref_values = ref_values

        raise ArgumentError, errors.full_messages.to_sentence unless valid?
      end

      # @return [Array]
      def ordered_field_values
        [
          "D",                  # identifier
          payee_id,
          ref_number,
          formatted_amount,
        ] + ref_values
      end

      private

      def formatted_amount
        "%012d" % (amount * BigDecimal("100"))
      end
    end
  end
end