show coupon details in invoice

app/models/reservation.rb

@@ -152,8 +152,7 @@ class Reservation < ActiveRecord::Base
           self.stp_invoice_id = invoice_items.first.refresh.invoice
           self.invoice.stp_invoice_id = invoice_items.first.refresh.invoice
           self.invoice.invoice_items.push InvoiceItem.new(amount: subscription.plan.amount, stp_invoice_item_id: subscription.stp_subscription_id, description: subscription.plan.name, subscription_id: subscription.id)
-          total = invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+)
-          self.invoice.total = total
+          set_total_and_coupon(coupon_code)
           save!
           #
           # IMPORTANT NOTE: here, we don't have to create a stripe::invoice and pay it
@@ -188,7 +187,7 @@ class Reservation < ActiveRecord::Base
           card.delete if card
           self.stp_invoice_id = stp_invoice.id
           self.invoice.stp_invoice_id = stp_invoice.id
-          self.invoice.total = invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+)
+          set_total_and_coupon(coupon_code)
           save!
         rescue Stripe::CardError => card_error
           clear_payment_info(card, stp_invoice, invoice_items)
@@ -285,16 +284,14 @@ class Reservation < ActiveRecord::Base
         self.subscription.attributes = {plan_id: plan_id, user_id: user.id, expired_at: nil}
         if subscription.save_with_local_payment(false)
           self.invoice.invoice_items.push InvoiceItem.new(amount: subscription.plan.amount, description: subscription.plan.name, subscription_id: subscription.id)
-          total = invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+)
-          self.invoice.total = total
+          set_total_and_coupon(coupon_code)
           save!
         else
           errors[:card] << subscription.errors[:card].join
           return false
         end
       else
-        total = invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+)
-        self.invoice.total = total
+        set_total_and_coupon(coupon_code)
         save!
       end
 
@@ -303,6 +300,7 @@ class Reservation < ActiveRecord::Base
     end
   end
 
+  private
   def machine_not_already_reserved
     already_reserved = false
     self.slots.each do |slot|
@@ -372,4 +370,21 @@ class Reservation < ActiveRecord::Base
       end
     end
   end
+
+  ##
+  # Set the total price to the reservation's invoice, summing its whole items.
+  # Additionally a coupon may be applied to this invoice to make a discount on the total price
+  # @param [coupon_code] {String} optional coupon code to apply to the invoice
+  ##
+  def set_total_and_coupon(coupon_code = nil)
+    total = invoice.invoice_items.map(&:amount).map(&:to_i).reduce(:+)
+
+    unless coupon_code.nil?
+      cp = Coupon.find_by_code(coupon_code)
+      total = total - (total  * cp.percent_off / 100)
+      self.invoice.coupon_id = cp.id
+    end
+
+    self.invoice.total = total
+  end
 end

app/pdfs/pdf/invoice.rb

@@ -83,6 +83,8 @@ module PDF
               object = subscription_verbose(invoice.invoiced, invoice.user)
             when 'OfferDay'
               object = offer_day_verbose(invoice.invoiced, invoice.user)
+            else
+              puts "ERROR : specified invoiced type (#{invoice.invoiced_type}) is unknown"
           end
         end
         text I18n.t('invoices.object')+' '+object
@@ -136,6 +138,16 @@ module PDF
           total_calc += price
         end
 
+        # subtract the coupon, if any
+        unless invoice.coupon_id.nil?
+          cp = invoice.coupon
+          discount = total_calc  * cp.percent_off / 100
+          total_calc = total_calc - discount
+
+          # add a row for the coupon
+          data += [ [I18n.t('invoices.coupon_CODE_discount_of_PERCENT', CODE: cp.code, PERCENT: cp.percent_off), number_to_currency(-discount)] ]
+        end
+
         # total verification
         total = invoice.total / 100.0
         if total_calc != total
@@ -215,16 +227,20 @@ module PDF
           payment_verbose += ' '+I18n.t('invoices.for_an_amount_of_AMOUNT', AMOUNT: number_to_currency(total))
 
         else
+          # subtract the wallet amount for this invoice from the total
           if invoice.wallet_amount
             wallet_amount = invoice.wallet_amount / 100.0
             total = total - wallet_amount
           end
 
+          # payment method
           if invoice.stp_invoice_id
             payment_verbose = I18n.t('invoices.settlement_by_debit_card')
           else
             payment_verbose = I18n.t('invoices.settlement_done_at_the_reception')
           end
+
+          # if the invoice was 100% payed with the wallet ...
           if total == 0 and wallet_amount
             payment_verbose = I18n.t('invoices.settlement_by_wallet')
           end

config/locales/en.yml

@@ -86,6 +86,7 @@ en:
       one: "One reduced rate ticket"
       other: "%{count} reduced rate tickets"
     reservation_other: "Reservation (other)"
+    coupon_CODE_discount_of_PERCENT: "Coupon %{CODE}: discount of %{PERCENT}%"
     total_including_all_taxes: "Total incl. all taxes"
     including_VAT_RATE: "Including VAT %{RATE}%"
     including_total_excluding_taxes: "Including Total excl. taxes"

config/locales/fr.yml

@@ -86,6 +86,7 @@ fr:
       one: "Une place à tarif réduit"
       other: "%{count} places à tarif réduit"
     reservation_other: "Réservation (autre)"
+    coupon_CODE_discount_of_PERCENT: "Code %{CODE} : remise de %{PERCENT} %"
     total_including_all_taxes: "Total TTC"
     including_VAT_RATE: "Dont TVA %{RATE}%"
     including_total_excluding_taxes: "Dont total HT"