Introduce class to handle param generation

This leaves the API class to just be resonsible for calling the right
methods on the TaxJar gem.

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/super_good/solidus_taxjar/api_params.rb b/lib/super_good/solidus_taxjar/api_params.rb
new file mode 100644
index 0000000..eba0947
--- /dev/null
+++ b/lib/super_good/solidus_taxjar/api_params.rb
@@ -0,0 +1,44 @@
+module SuperGood
+  module SolidusTaxJar
+    module APIParams
+      class << self
+        def order_params(order)
+          {}
+            .merge(address_params(order.tax_address))
+            .merge(line_items_params(order.line_items))
+            .merge(shipping: order.shipment_total)
+        end
+
+        private
+
+        def address_params(address)
+          {
+            to_country: address.country.iso,
+            to_zip: address.zipcode,
+            to_city: address.city,
+            to_state: address&.state&.abbr || address.state_name,
+            to_street: address.address1,
+          }
+        end
+
+        def line_items_params(line_items)
+          {
+            line_items: line_items.map do |line_item|
+              {
+                id: line_item.id,
+                quantity: line_item.quantity,
+                unit_price: line_item.price,
+                discount: discount(line_item),
+                product_tax_code: line_item.tax_category&.tax_code
+              }
+            end
+          }
+        end
+
+        def discount(line_item)
+          ::SuperGood::SolidusTaxJar.discount_calculator.new(line_item).discount
+        end
+      end
+    end
+  end
+end