openfoodnetwork/app/services/orders/generate_invoice_service.rb

# frozen_string_literal: true

module Orders
  class GenerateInvoiceService
    def initialize(order)
      @order = order
    end

    def generate_or_update_latest_invoice
      if comparator.can_generate_new_invoice?
        order.invoices.create!(
          date: Time.zone.today,
          number: total_invoices_created_by_distributor + 1,
          data: invoice_data
        )
      elsif comparator.can_update_latest_invoice?
        order.invoices.latest.update!(
          date: Time.zone.today,
          data: invoice_data
        )
      end
    end

    private

    attr_reader :order

    def comparator
      @comparator ||= Orders::CompareInvoiceService.new(order)
    end

    def invoice_data
      @invoice_data ||= InvoiceDataGenerator.new(order).generate
    end

    def total_invoices_created_by_distributor
      Invoice.joins(:order).where(order: { distributor: order.distributor }).count
    end
  end
end