Calculate stock from DFC wholesale variants

app/controllers/admin/dfc_product_imports_controller.rb

@@ -19,15 +19,12 @@ def index
         .find(params.require(:enterprise_id))
 
       catalog_url = params.require(:catalog_url)
-      broker = FdcOfferBroker.new(spree_current_user, catalog_url)
+      catalog = DfcCatalog.load(spree_current_user, catalog_url)
+      catalog.apply_wholesale_values!
 
       # * First step: import all products for given enterprise.
       # * Second step: render table and let user decide which ones to import.
-      imported = broker.catalog.map do |subject|
-        next unless subject.is_a? DataFoodConsortium::Connector::SuppliedProduct
-
-        adjust_to_wholesale_price(broker, subject)
-
+      imported = catalog.products.map do |subject|
         existing_variant = enterprise.supplied_variants.linked_to(subject.semanticId)
 
         if existing_variant
@@ -44,24 +41,5 @@ def index
       flash[:error] = e.message
       redirect_to admin_product_import_path
     end
-
-    private
-
-    def adjust_to_wholesale_price(broker, product)
-      transformation = broker.best_offer(product.semanticId)
-
-      return if transformation.factor == 1
-
-      wholesale_variant_price = transformation.offer.price
-
-      return unless wholesale_variant_price
-
-      offer = product.catalogItems&.first&.offers&.first
-
-      return unless offer
-
-      offer.price = wholesale_variant_price.dup
-      offer.price.value = offer.price.value.to_f / transformation.factor
-    end
   end
 end

app/jobs/backorder_job.rb

@@ -117,7 +117,8 @@ def needed_quantity(line_item)
   end
 
   def load_broker(user, urls)
-    FdcOfferBroker.new(user, urls.catalog_url)
+    catalog = DfcCatalog.load(user, urls.catalog_url)
+    FdcOfferBroker.new(catalog)
   end
 
   def place_order(user, order, orderer, backorder)

app/jobs/stock_sync_job.rb

@@ -40,7 +40,10 @@ def self.catalog_ids(order)
   end
 
   def perform(user, catalog_id)
-    products = load_products(user, catalog_id)
+    catalog = DfcCatalog.load(user, catalog_id)
+    catalog.apply_wholesale_values!
+
+    products = catalog.products
     products_by_id = products.index_by(&:semanticId)
     product_ids = products_by_id.keys
     variants = linked_variants(user.enterprises, product_ids)
@@ -58,15 +61,6 @@ def perform(user, catalog_id)
     end
   end
 
-  def load_products(user, catalog_id)
-    json_catalog = DfcRequest.new(user).call(catalog_id)
-    graph = DfcIo.import(json_catalog)
-
-    graph.select do |subject|
-      subject.is_a? DataFoodConsortium::Connector::SuppliedProduct
-    end
-  end
-
   def linked_variants(enterprises, product_ids)
     Spree::Variant.where(supplier: enterprises)
       .includes(:semantic_links).references(:semantic_links)

app/services/backorder_updater.rb

@@ -40,7 +40,8 @@ def update(backorder, user, distributor, order_cycle)
     reference_link = variants[0].semantic_links[0].semantic_id
     urls = FdcUrlBuilder.new(reference_link)
     orderer = FdcBackorderer.new(user, urls)
-    broker = FdcOfferBroker.new(user, urls.catalog_url)
+    catalog = DfcCatalog.load(user, urls.catalog_url)
+    broker = FdcOfferBroker.new(catalog)
 
     updated_lines = update_order_lines(backorder, order_cycle, variants, broker, orderer)
     unprocessed_lines = backorder.lines.to_set - updated_lines

app/services/fdc_offer_broker.rb

@@ -6,19 +6,10 @@ class FdcOfferBroker
   Solution = Struct.new(:product, :factor, :offer)
   RetailSolution = Struct.new(:retail_product_id, :factor)
 
-  def self.load_catalog(user, catalog_url)
-    api = DfcRequest.new(user)
-    catalog_json = api.call(catalog_url)
-    DfcIo.import(catalog_json)
-  end
-
-  def initialize(user, catalog_url)
-    @user = user
-    @catalog_url = catalog_url
-  end
+  attr_reader :catalog
 
-  def catalog
-    @catalog ||= self.class.load_catalog(@user, @catalog_url)
+  def initialize(catalog)
+    @catalog = catalog
   end
 
   def best_offer(product_id)
@@ -30,18 +21,18 @@ def best_offer(product_id)
   end
 
   def wholesale_product(product_id)
-    production_flow = catalog_item("#{product_id}/AsPlannedProductionFlow")
+    production_flow = catalog.item("#{product_id}/AsPlannedProductionFlow")
 
     if production_flow
       production_flow.product
     else
       # We didn't find a wholesale variant, falling back to the given product.
-      catalog_item(product_id)
+      catalog.item(product_id)
     end
   end
 
   def contained_quantity(product_id)
-    consumption_flow = catalog_item("#{product_id}/AsPlannedConsumptionFlow")
+    consumption_flow = catalog.item("#{product_id}/AsPlannedConsumptionFlow")
 
     # If we don't find a transformation, we return the original product,
     # which contains exactly one of itself (identity).
@@ -53,7 +44,7 @@ def wholesale_to_retail(wholesale_product_id)
 
     return RetailSolution.new(wholesale_product_id, 1) if production_flow.nil?
 
-    consumption_flow = catalog_item(
+    consumption_flow = catalog.item(
       production_flow.semanticId.sub("AsPlannedProductionFlow", "AsPlannedConsumptionFlow")
     )
     retail_product_id = consumption_flow.product.semanticId
@@ -70,19 +61,12 @@ def offer_of(product)
     end
   end
 
-  def catalog_item(id)
-    @catalog_by_id ||= catalog.index_by(&:semanticId)
-    @catalog_by_id[id]
-  end
-
   def flow_producing(wholesale_product_id)
     @production_flows_by_product_id ||= production_flows.index_by { |flow| flow.product.semanticId }
     @production_flows_by_product_id[wholesale_product_id]
   end
 
   def production_flows
-    @production_flows ||= catalog.select do |i|
-      i.semanticType == "dfc-b:AsPlannedProductionFlow"
-    end
+    @production_flows ||= catalog.select_type("dfc-b:AsPlannedProductionFlow")
   end
 end

engines/dfc_provider/app/services/dfc_catalog.rb

@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+class DfcCatalog
+  def self.load(user, catalog_url)
+    api = DfcRequest.new(user)
+    catalog_json = api.call(catalog_url)
+    graph = DfcIo.import(catalog_json)
+
+    new(graph)
+  end
+
+  def initialize(graph)
+    @graph = graph
+  end
+
+  def products
+    @products ||= @graph.select do |subject|
+      subject.is_a? DataFoodConsortium::Connector::SuppliedProduct
+    end
+  end
+
+  def item(semantic_id)
+    @items ||= @graph.index_by(&:semanticId)
+    @items[semantic_id]
+  end
+
+  def select_type(semantic_type)
+    @graph.select { |i| i.semanticType == semantic_type }
+  end
+
+  def apply_wholesale_values!
+    broker = FdcOfferBroker.new(self)
+    products.each do |product|
+      transformation = broker.best_offer(product.semanticId)
+
+      next if transformation.factor == 1
+
+      adjust_to_wholesale_price(product, transformation)
+      adjust_to_wholesale_stock(product, transformation)
+    end
+  end
+
+  private
+
+  def adjust_to_wholesale_price(product, transformation)
+    wholesale_variant_price = transformation.offer.price
+
+    return unless wholesale_variant_price
+
+    offer = product.catalogItems&.first&.offers&.first
+
+    return unless offer
+
+    offer.price = wholesale_variant_price.dup
+    offer.price.value = offer.price.value.to_f / transformation.factor
+  end
+
+  def adjust_to_wholesale_stock(product, transformation)
+    adjust_item_stock(product, transformation)
+    adjust_offer_stock(product, transformation)
+  end
+
+  def adjust_item_stock(product, transformation)
+    item = product.catalogItems&.first
+    wholesale_item = transformation.product.catalogItems&.first
+
+    return unless item && wholesale_item&.stockLimitation.present?
+
+    item.stockLimitation = wholesale_item.stockLimitation.to_i * transformation.factor
+  end
+
+  def adjust_offer_stock(product, transformation)
+    offer = product.catalogItems&.first&.offers&.first
+    wholesale_offer = transformation.offer
+
+    return unless offer && wholesale_offer&.stockLimitation.present?
+
+    offer.stockLimiation = wholesale_offer.stockLimitation.to_i * transformation.factor
+  end
+end

engines/dfc_provider/spec/services/dfc_catalog_spec.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require_relative "../spec_helper"
+
+RSpec.describe DfcCatalog do
+  subject(:catalog) {
+    VCR.use_cassette(:fdc_catalog) {
+      DfcCatalog.load(user, catalog_url)
+    }
+  }
+  let(:user) { build(:testdfc_user) }
+  let(:catalog_url) {
+    "https://env-0105831.jcloud-ver-jpe.ik-server.com/api/dfc/Enterprises/test-hodmedod/SuppliedProducts"
+  }
+
+  describe "#products" do
+    let(:products) { catalog.products }
+
+    it "returns only products" do
+      expect(products.count).to eq 4
+      expect(products.map(&:semanticType).uniq).to eq ["dfc-b:SuppliedProduct"]
+    end
+  end
+
+  describe "#apply_wholesale_values!" do
+    let(:offer) { beans.catalogItems.first.offers.first }
+    let(:catalog_item) { beans.catalogItems.first }
+    let(:beans) { catalog.item(beans_id) }
+    let(:beans_id) {
+      "https://env-0105831.jcloud-ver-jpe.ik-server.com/api/dfc/Enterprises/test-hodmedod/SuppliedProducts/44519466467635"
+    }
+
+    it "changes price of retail variants" do
+      expect { catalog.apply_wholesale_values! }.to change {
+        offer.price.value.to_f.round(2)
+      }.from(2.09).to(1.57) # 18.85 wholesale price divided by 12
+    end
+
+    it "changes stock level of retail variants" do
+      expect { catalog.apply_wholesale_values! }.to change {
+        catalog_item.stockLimitation
+      }.from("-1").to(-12)
+    end
+  end
+end

spec/jobs/complete_backorder_job_spec.rb

@@ -14,13 +14,14 @@
   let(:orderer) { FdcBackorderer.new(user, urls) }
   let(:order) {
     backorder = orderer.find_or_build_order(ofn_order)
-    broker = FdcOfferBroker.new(user, urls.catalog_url)
+    catalog = DfcCatalog.load(user, urls.catalog_url)
+    broker = FdcOfferBroker.new(catalog)
 
     bean_offer = broker.best_offer(product_link).offer
     bean_line = orderer.find_or_build_order_line(backorder, bean_offer)
     bean_line.quantity = 3
 
-    chia = broker.catalog_item(chia_seed_retail_link)
+    chia = catalog.item(chia_seed_retail_link)
     chia_offer = broker.offer_of(chia)
     chia_line = orderer.find_or_build_order_line(backorder, chia_offer)
     chia_line.quantity = 5

spec/services/fdc_backorderer_spec.rb

@@ -33,9 +33,9 @@
     expect(backorder.lines).to eq []
 
     # Add items and place the new order:
-    catalog = FdcOfferBroker.load_catalog(order.distributor.owner, urls.catalog_url)
-    product = catalog.find { |i| i.semanticType == "dfc-b:SuppliedProduct" }
-    offer = FdcOfferBroker.new(nil, nil).offer_of(product)
+    catalog = DfcCatalog.load(order.distributor.owner, urls.catalog_url)
+    product = catalog.products.first
+    offer = FdcOfferBroker.new(nil).offer_of(product)
     line = subject.find_or_build_order_line(backorder, offer)
     line.quantity = 3
     placed_order = subject.send_order(backorder)
@@ -80,7 +80,7 @@
 
   describe "#find_or_build_order_line" do
     it "add quantity to an existing line item", vcr: true do
-      catalog = FdcOfferBroker.load_catalog(order.distributor.owner, urls.catalog_url)
+      catalog = DfcCatalog.load(order.distributor.owner, urls.catalog_url)
       backorder = subject.find_or_build_order(order)
       existing_line = backorder.lines[0]
 
@@ -89,10 +89,8 @@
       # the catalog offer here which is different to the offer on the
       # existing order line.
       ordered_product = existing_line.offer.offeredItem
-      catalog_product = catalog.find do |i|
-        i.semanticId == ordered_product.semanticId
-      end
-      catalog_offer = FdcOfferBroker.new(nil, nil).offer_of(catalog_product)
+      catalog_product = catalog.item(ordered_product.semanticId)
+      catalog_offer = FdcOfferBroker.new(nil).offer_of(catalog_product)
 
       # The API response is missing this connection:
       catalog_offer.offeredItem = catalog_product

spec/services/fdc_offer_broker_spec.rb

@@ -3,9 +3,11 @@
 require 'spec_helper'
 
 RSpec.describe FdcOfferBroker do
-  subject { FdcOfferBroker.new(user, catalog_url) }
+  subject { FdcOfferBroker.new(catalog) }
   let(:catalog) {
-    VCR.use_cassette(:fdc_catalog) { subject.catalog }
+    VCR.use_cassette(:fdc_catalog) {
+      DfcCatalog.load(user, catalog_url)
+    }
   }
   let(:catalog_url) {
     "https://env-0105831.jcloud-ver-jpe.ik-server.com/api/dfc/Enterprises/test-hodmedod/SuppliedProducts"
@@ -15,7 +17,7 @@
   }
   let(:user) { build(:testdfc_user) }
   let(:product) {
-    catalog.find { |item| item.semanticType == "dfc-b:SuppliedProduct" }
+    catalog.products.first
   }
 
   describe ".best_offer" do