module InvoicePrinter
  # Invoice and receipt representation
  #
  # Example:
  #
  #   invoice = InvoicePrinter::Document.new(
  #     number: '198900000001',
  #     provider_name: 'Business s.r.o.',
  #     provider_ic: '56565656',
  #     provider_dic: '465454',
  #     provider_street: 'Rolnicka',
  #     provider_street_number: '1',
  #     provider_postcode: '747 05',
  #     provider_city: 'Opava',
  #     provider_city_part: 'Katerinky',
  #     provider_extra_address_line: 'Czech Republic',
  #     purchaser_name: 'Adam',
  #     purchaser_ic: '',
  #     purchaser_dic: '',
  #     purchaser_street: 'Ostravska',
  #     purchaser_street_number: '1',
  #     purchaser_postcode: '747 70',
  #     purchaser_city: 'Opava',
  #     purchaser_city_part: '',
  #     purchaser_extra_address_line: '',
  #     issue_date: '19/03/3939',
  #     due_date: '19/03/3939',
  #     subtotal: '$ 150',
  #     tax: '$ 50',
  #     total: '$ 200',
  #     bank_account_number: '156546546465',
  #     account_iban: 'IBAN464545645',
  #     account_swift: 'SWIFT5456',
  #     items: [
  #       InvoicePrinter::Document::Item.new,
  #       InvoicePrinter::Document::Item.new
  #     ]
  #   )
  #
  # +amount should equal the sum of all item's +amount+,
  # but this is not enforced.
  class Document
    class InvalidInput < StandardError; end

    attr_reader :number,
                # Provider fields
                :provider_name,
                :provider_ic,
                :provider_dic,
                # Provider address fields
                :provider_street,
                :provider_street_number,
                :provider_postcode,
                :provider_city,
                :provider_city_part,
                :provider_extra_address_line,
                # Purchaser fields
                :purchaser_name,
                :purchaser_ic,
                :purchaser_dic,
                # Purchaser address fields
                :purchaser_street,
                :purchaser_street_number,
                :purchaser_postcode,
                :purchaser_city,
                :purchaser_city_part,
                :purchaser_extra_address_line,
                :issue_date,
                :due_date,
                # Account details
                :subtotal,
                :tax,
                :tax2,
                :tax3,
                :total,
                :bank_account_number,
                :account_iban,
                :account_swift,
                # Collection of InvoicePrinter::Invoice::Items
                :items

    def initialize(number: nil,
                   provider_name: nil,
                   provider_ic: nil,
                   provider_dic: nil,
                   provider_street: nil,
                   provider_street_number: nil,
                   provider_postcode: nil,
                   provider_city: nil,
                   provider_city_part: nil,
                   provider_extra_address_line: nil,
                   purchaser_name: nil,
                   purchaser_ic: nil,
                   purchaser_dic: nil,
                   purchaser_street: nil,
                   purchaser_street_number: nil,
                   purchaser_postcode: nil,
                   purchaser_city: nil,
                   purchaser_city_part: nil,
                   purchaser_extra_address_line: nil,
                   issue_date: nil,
                   due_date: nil,
                   subtotal: nil,
                   tax: nil,
                   tax2: nil,
                   tax3: nil,
                   total: nil,
                   bank_account_number: nil,
                   account_iban: nil,
                   account_swift: nil,
                   items: nil)
      @number = String(number)
      @provider_name = String(provider_name)
      @provider_ic = String(provider_ic)
      @provider_dic = String(provider_dic)
      @provider_street = String(provider_street)
      @provider_street_number = String(provider_street_number)
      @provider_postcode = String(provider_postcode)
      @provider_city = String(provider_city)
      @provider_city_part = String(provider_city_part)
      @provider_extra_address_line = String(provider_extra_address_line)
      @purchaser_name = String(purchaser_name)
      @purchaser_ic = String(purchaser_ic)
      @purchaser_dic = String(purchaser_dic)
      @purchaser_street = String(purchaser_street)
      @purchaser_street_number = String(purchaser_street_number)
      @purchaser_postcode = String(purchaser_postcode)
      @purchaser_city = String(purchaser_city)
      @purchaser_city_part = String(purchaser_city_part)
      @purchaser_extra_address_line = String(purchaser_extra_address_line)
      @issue_date = String(issue_date)
      @due_date = String(due_date)
      @subtotal = String(subtotal)
      @tax = String(tax)
      @tax2 = String(tax2)
      @tax3 = String(tax3)
      @total = String(total)
      @bank_account_number = String(bank_account_number)
      @account_iban = String(account_iban)
      @account_swift = String(account_swift)
      @items = items

      raise InvalidInput, 'items are not only a type of InvoicePrinter::Document::Item' \
        unless @items.select{ |i| !i.is_a?(InvoicePrinter::Document::Item) }.empty?
    end
  end
end