2 files changed, 169 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
diff --git a/spec/super_good/solidus_taxjar/api_params_spec.rb b/spec/super_good/solidus_taxjar/api_params_spec.rb
new file mode 100644
index 0000000..d880e7f
--- /dev/null
+++ b/spec/super_good/solidus_taxjar/api_params_spec.rb
@@ -0,0 +1,125 @@
+require 'spec_helper'
+
+RSpec.describe SuperGood::SolidusTaxJar::APIParams do
+  let(:order) do
+    Spree::Order.create!(
+      item_total: 28.00,
+      shipment_total: 3.01,
+      store: store,
+      ship_address: ship_address,
+      line_items: [line_item]
+    )
+  end
+
+  let(:store) do
+    Spree::Store.create!(
+      name: "Default Store",
+      url: "https://store.example.com",
+      code: "store",
+      mail_from_address: "contact@example.com",
+      cart_tax_country_iso: "US"
+    )
+  end
+
+  let(:ship_address) do
+    Spree::Address.create!(
+      country: country_us,
+      state: state_california,
+      zipcode: "90210",
+      city: "Los Angeles",
+      address1: "475 N Beverly Dr",
+
+      first_name: "Chuck",
+      last_name: "Schuldiner",
+      phone: "1-250-555-4444"
+    )
+  end
+
+  let(:country_us) do
+    Spree::Country.create!(
+      iso_name: "UNITED STATES",
+      iso: "US",
+      iso3: "USA",
+      name: "United States",
+      numcode: 840,
+      states_required: true
+    )
+  end
+
+  let(:state_california) do
+    Spree::State.create!(
+      country: country_us,
+      name: "California",
+      abbr: "CA"
+    )
+  end
+
+  let(:line_item) do
+    Spree::LineItem.new(
+      variant: variant,
+      price: 10,
+      quantity: 3,
+      promo_total: -2
+    )
+  end
+
+  let(:variant) do
+    Spree::Variant.create!(
+      product: product,
+      price: 10
+    )
+  end
+
+  let(:product) do
+    Spree::Product.create!(
+      name: "Product Name",
+      shipping_category: shipping_category,
+      tax_category: tax_category,
+      master: master_variant,
+      variants: [master_variant]
+    )
+  end
+
+  let(:shipping_category) do
+    Spree::ShippingCategory.create!(name: "Default Category")
+  end
+
+  let(:tax_category) do
+    Spree::TaxCategory.create!(
+      name: "Default",
+      is_default: true,
+      tax_code: "A_GEN_TAX"
+    )
+  end
+
+  let(:master_variant) do
+    Spree::Variant.new(
+      is_master: true,
+      price: 10
+    )
+  end
+
+  describe "#order_params" do
+    subject { described_class.order_params(order) }
+
+    it "returns params for fetching the tax for the order" do
+      expect(subject).to eq(
+        to_country: "US",
+        to_zip: "90210",
+        to_city: "Los Angeles",
+        to_state: "CA",
+        to_street: "475 N Beverly Dr",
+
+        shipping: 3.01,
+
+        line_items: [{
+          id: order.line_items.first.id,
+          quantity: 3,
+          unit_price: 10.00,
+          discount: 2.00,
+          product_tax_code: "A_GEN_TAX"
+        }]
+      )
+    end
+  end
+end