Created a new InvoiceGeneration class

It should work similar to TotalOrderValue and we can then move the Pricing::Offer logic of splitting things into invoice items, to this process.

Author: andrzejkrzywda

rails_application/.mutant.yml

@@ -51,3 +51,4 @@ matcher:
     - Processes::NotifyPaymentsAboutOrderValue*
     - Processes::WelcomeMessageProcess*
     - Processes::TotalOrderValue#fetch_id
+    - Processes::InvoiceGeneration#fetch_id

rails_application/app/processes/processes/configuration.rb

@@ -21,6 +21,7 @@ def call(event_store, command_bus)
       enable_reservation_process(event_store, command_bus)
       enable_welcome_message_process(event_store, command_bus)
       enable_total_order_value_process(event_store, command_bus)
+      enable_invoice_generation_process(event_store, command_bus)
     end
 
     private
@@ -133,5 +134,12 @@ def enable_total_order_value_process(event_store, command_bus)
         to: TotalOrderValue.subscribed_events
       )
     end
+
+    def enable_invoice_generation_process(event_store, command_bus)
+      event_store.subscribe(
+        InvoiceGeneration.new(event_store, command_bus),
+        to: InvoiceGeneration.subscribed_events
+      )
+    end
   end
 end

rails_application/app/processes/processes/invoice_generation.rb

@@ -0,0 +1,25 @@
+module Processes
+  class InvoiceGeneration
+    include Infra::ProcessManager.with_state { Invoice }
+
+    subscribes_to(
+      Pricing::PriceItemAdded,
+      Pricing::PriceItemRemoved,
+      Pricing::PercentageDiscountSet,
+      Pricing::PercentageDiscountChanged,
+      Pricing::PercentageDiscountRemoved
+    )
+
+
+    private
+
+    def fetch_id(event)
+      event.data.fetch(:order_id)
+    end
+
+  end
+
+  Invoice = Data.define do
+  end
+
+end

rails_application/app/processes/processes/total_order_value.rb

@@ -10,8 +10,6 @@ class TotalOrderValue
       Pricing::PercentageDiscountRemoved
     )
 
-    private
-
     def act
       publish_total_order_value(state.subtotal, state.discounted_value)
     end
@@ -33,6 +31,7 @@ def apply(event)
         state
       end
     end
+
     private
 
     def publish_total_order_value(total_amount, discounted_amount)

rails_application/test/processes/invoice_generation_test.rb

@@ -0,0 +1,14 @@
+require "test_helper"
+
+module Processes
+  class InvoiceGenerationTest < ProcessTest
+    cover "Processes::InvoiceGeneration"
+
+    def test_basic_invoice_generation
+      assert true
+    end
+
+    private
+
+  end
+end