refactoring create cart service

app/controllers/api/cart_controller.rb

@@ -9,22 +9,7 @@ class API::CartController < API::ApiController
 
   def create
     authorize :cart, :create?
-    @order = Order.find_by(token: order_token, state: 'cart')
-    if @order.nil?
-      if current_user&.member?
-        @order = Order.where(statistic_profile_id: current_user.statistic_profile.id,
-                             state: 'cart').last
-      end
-      if current_user&.privileged?
-        @order = Order.where(operator_profile_id: current_user.invoicing_profile.id,
-                             state: 'cart').last
-      end
-    end
-    if @order
-      @order.update(statistic_profile_id: current_user.statistic_profile.id) if @order.statistic_profile_id.nil? && current_user&.member?
-      @order.update(operator_profile_id: current_user.invoicing_profile.id) if @order.operator_profile_id.nil? && current_user&.privileged?
-    end
-    @order ||= Cart::CreateService.new.call(current_user)
+    @order ||= Cart::FindOrCreateService.new.call(order_token, current_user)
     render 'api/orders/show'
   end
 

app/services/cart/create_service.rb

@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-# Provides methods for create cart
-class Cart::CreateService
-  def call(user)
-    token = GenerateTokenService.new.call(Order)
-    order_param = {
-      token: token,
-      state: 'cart',
-      total: 0
-    }
-    if user
-      order_param[:statistic_profile_id] = user.statistic_profile.id if user.member?
-
-      order_param[:operator_profile_id] = user.invoicing_profile.id if user.privileged?
-    end
-    Order.create!(order_param)
-  end
-end

app/services/cart/find_or_create_service.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+# Provides methods for find or create a cart
+class Cart::FindOrCreateService
+  def call(order_token, user)
+    order = Order.find_by(token: order_token, state: 'cart')
+
+    if order && user && ((user.member? && order.statistic_profile_id.present? && order.statistic_profile_id != user.statistic_profile.id) ||
+        (user.privileged? && order.operator_profile_id.present? && order.operator_profile_id != user.invoicing_profile.id))
+      order = nil
+    end
+    order = nil if order && !user && order.statistic_profile_id.present?
+    if order && order.statistic_profile_id.present? && Order.where(statistic_profile_id: order.statistic_profile_id,
+                                                                   payment_state: 'paid').where('created_at > ?', order.created_at).last.present?
+      order = nil
+    end
+
+    if order.nil?
+      if user&.member?
+        last_paid_order = Order.where(statistic_profile_id: user.statistic_profile.id,
+                                      payment_state: 'paid').last
+        order = if last_paid_order
+                  Order.where(statistic_profile_id: user.statistic_profile.id,
+                              state: 'cart').where('created_at > ?', last_paid_order.created_at).last
+                else
+                  Order.where(statistic_profile_id: user.statistic_profile.id, state: 'cart').last
+                end
+      end
+      if user&.privileged?
+        last_paid_order = Order.where(operator_profile_id: user.invoicing_profile.id,
+                                      payment_state: 'paid').last
+        order = if last_paid_order
+                  Order.where(operator_profile_id: user.invoicing_profile.id,
+                              state: 'cart').where('created_at > ?', last_paid_order.created_at).last
+                else
+                  Order.where(operator_profile_id: user.invoicing_profile.id, state: 'cart').last
+                end
+      end
+    end
+
+    if order
+      order.update(statistic_profile_id: user.statistic_profile.id) if order.statistic_profile_id.nil? && user&.member?
+      order.update(operator_profile_id: user.invoicing_profile.id) if order.operator_profile_id.nil? && user&.privileged?
+      return order
+    end
+
+    token = GenerateTokenService.new.call(Order)
+    order_param = {
+      token: token,
+      state: 'cart',
+      total: 0
+    }
+    if user
+      order_param[:statistic_profile_id] = user.statistic_profile.id if user.member?
+
+      order_param[:operator_profile_id] = user.invoicing_profile.id if user.privileged?
+    end
+    Order.create!(order_param)
+  end
+end