Implement shipment formatter

lib/planet_express.rb

@@ -13,7 +13,7 @@ require 'planet_express/invalid_shipment'
 require 'planet_express/shipment'
 require 'planet_express/shipment_repository'
 require 'planet_express/shipment_reader'
-# require 'planet_express/shipment_formatter'
+require 'planet_express/shipment_formatter'
 
 require 'planet_express/shipping_option'
 require 'planet_express/shipping_option_repository'

lib/planet_express/invalid_shipment.rb

@@ -1,5 +1,7 @@
 module PlanetExpress
   class InvalidShipment
+    attr_reader :raw_string
+
     def initialize(raw_string)
       @raw_string = raw_string
     end

lib/planet_express/shipment_formatter.rb

@@ -0,0 +1,29 @@
+module PlanetExpress
+  class ShipmentFormatter
+    def format(shipment)
+      return format_invalid_shipment(shipment) if shipment.instance_of?(InvalidShipment)
+
+      format_valid_shipment(shipment)
+    end
+
+    private
+
+    def format_invalid_shipment(shipment)
+      "#{shipment.raw_string} IGNORED"
+    end
+
+    def format_valid_shipment(shipment)
+      date = shipment.date.iso8601
+      package_size = shipment.shipping_option.package_size
+      provider = shipment.shipping_option.provider
+      price = shipment.price_with_discounts
+      discount = shipment.total_discount_amount
+
+      "#{date} #{package_size} #{provider} #{format_money(price)} #{discount.zero? ? '-' : format_money(discount)}"
+    end
+
+    def format_money(amount)
+      amount.to_s.rjust(3,'0').insert(-3, '.')
+    end
+  end
+end

spec/shipment_formatter_spec.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+RSpec.describe PlanetExpress::ShipmentFormatter do
+  subject do
+    described_class.new
+  end
+
+  describe '#format' do
+    context 'invalid shipment' do
+      let(:shipment) do
+        PlanetExpress::InvalidShipment.new("Invalid Shipment")
+      end
+
+      it 'returns a well formatted string' do
+        expect(subject.format(shipment)).to eq('Invalid Shipment IGNORED')
+      end
+    end
+
+    context 'valid shipment' do
+      let(:date) { Date.today }
+      let(:shipping_option) do
+        build(:shipping_option,
+              provider: 'T',
+              package_size: 'S',
+              price_in_cents: 120)
+      end
+
+      let(:shipment) do
+        PlanetExpress::Shipment.new(date, shipping_option)
+      end
+
+      it 'returns a well formatted string' do
+        result = subject.format(shipment)
+        parts = result.split(' ')
+
+        expect(parts[0]).to eq(date.iso8601)
+        expect(parts[1]).to eq(shipping_option.package_size)
+        expect(parts[2]).to eq(shipping_option.provider)
+        expect(parts[3]).to eq('1.20')
+        expect(parts[4]).to eq('-')
+      end
+
+      context 'with discounts' do
+        before(:each) do
+          shipment.add_discount(PlanetExpress::Discount.new(50, nil))
+          shipment.add_discount(PlanetExpress::Discount.new(25, nil))
+        end
+
+        it 'includes the discounts' do
+          result = subject.format(shipment)
+          parts = result.split(' ')
+
+          expect(parts[0]).to eq(date.iso8601)
+          expect(parts[1]).to eq(shipping_option.package_size)
+          expect(parts[2]).to eq(shipping_option.provider)
+          expect(parts[3]).to eq('0.45')
+          expect(parts[4]).to eq('0.75')
+        end
+      end
+    end
+  end
+end