4 files changed, 71 insertions, 0 deletions
diff --git a/app/models/order.rb b/app/models/order.rb
index ae5a0d5..213bde9 100644
--- a/app/models/order.rb
+++ b/app/models/order.rb
@@ -7,4 +7,5 @@ class Order < ApplicationRecord
   has_one :payment
   has_many :product_orders
   has_many :products, through: :product_orders
+  accepts_nested_attributes_for :product_orders
 end
diff --git a/app/models/payment.rb b/app/models/payment.rb
index 5d5e862..4839de8 100644
--- a/app/models/payment.rb
+++ b/app/models/payment.rb
@@ -5,4 +5,11 @@
 class Payment < ApplicationRecord
   has_one :order
   belongs_to :card
+  validate :card_belongs_to_user
+
+  def card_belongs_to_user
+    return unless order.user_account.cards.find_by(id: card.id).nil?
+
+    errors.add(:card_id, "doesn't belong to user")
+  end
 end
diff --git a/app/services/payment/cart_to_order_service.rb b/app/services/payment/cart_to_order_service.rb
new file mode 100644
index 0000000..8dff43e
--- /dev/null
+++ b/app/services/payment/cart_to_order_service.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Payment
+  # CartToOrderService
+  class CartToOrderService
+    def initialize(user_account)
+      @user_account = user_account
+      @cart = @user_account.cart
+    end
+
+    def call
+      order = Order.create(user_account_id: @user_account.id)
+
+      @cart.product_carts.pluck(:product_id, :quantity).each do |data|
+        ProductOrder.create(order_id: order.id, product_id: data[0], quantity: data[1])
+      end
+
+      order
+    end
+  end
+end
diff --git a/app/services/payment/payment_service.rb b/app/services/payment/payment_service.rb
new file mode 100644
index 0000000..9f44f87
--- /dev/null
+++ b/app/services/payment/payment_service.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Payment
+  # PaymentService
+  class PaymentService
+    attr_reader :error_messages
+
+    def initialize(params, user_account)
+      @user_account = user_account
+      @params = params
+      @order = Order.new(params.except(:card_id))
+      @card_id = params[:card_id]
+      @order = CartToOrderService.new(@user_account).call
+    end
+
+    def call
+      payment = Payment.new(order_id: @order.id, card_id: @card_id, total:)
+
+      @error_messages = { errors: @payment.errors.as_json } and return unless payment.save
+
+      @order.update(payment_id: payment.id)
+      user_account.cart.product_carts.destroy_all
+      @order
+    end
+
+    private
+
+    def total
+      total = 0
+
+      @order.product_orders.joins(:product).select(
+        'product_orders.*, products.bulk_price AS bulk_price, products.unitary_price AS unitary_price'
+      ).each do |product_order|
+        total += if product_order.quantity < 5
+                   unitary_price * product_order.quantity
+                 else
+                   bulk_price * product_order.quantity
+                 end
+      end
+    end
+  end
+end