Bl/waitlist notify (#254)

* added twilio messenger module, also tweaked the application config to autoload the module

* tried to modified messenger with text processing but failed

* added code to send out text alert to the next person on the wait list after a tool is checked back in

* added a safeguard for phone number in case someone has not put their phonenumber in the system yet

* updated messenger module with try-rescue block

* commented out code for reply forwarding. There is an issue for the forwarding and it seems to be security related. Need to discuss it with people more knowledgable before implemeting this feature

* removed commented code. Will probably add it to a seperate branch. Just trying to merge this code to goat branch

* modified messenger to keep track of error code

app/controllers/checkouts_controller.rb

@@ -160,8 +160,6 @@ def uncheckin
         format.html { redirect_to tool_path(checkout.tool), notice: "Error" }
       end
     end
-
-
   end
 
 
@@ -205,5 +203,6 @@ def checkin_bak
       end
     end
   end
+
 end
 

app/models/checkout.rb

@@ -22,6 +22,8 @@
 #
 
 class Checkout < ActiveRecord::Base
+  include Messenger
+
   # For lookups
   def card_number=( card_number )
     @card_number = card_number
@@ -35,6 +37,7 @@ def card_number
   validates_associated :tool, :organization, :participant
 
   before_save :checked_out_at, :presence => true
+  after_update :notify
 
   belongs_to :participant, :touch => true
   belongs_to :organization, :touch => true
@@ -44,4 +47,21 @@ def card_number
   scope :old, -> { where('checked_in_at IS NOT NULL') }
   scope :current, -> { where('checked_in_at IS NULL') }
 
-end
+  private
+
+  def notify
+    if (self.checked_in_at != nil)
+      toolCategory = self.tool.tool_type
+      waitlist = ToolWaitlist.for_tool_type(toolCategory.id).by_wait_start_time
+      if (waitlist.count != 0)
+        nextPerson = waitlist.first.participant
+        unless (nextPerson.phone_number.blank?)
+          number = nextPerson.phone_number
+          content = "#{toolCategory.name} is now available at the trailer. Please come pick it up within 5 minutes!"
+          send_sms(number, content)
+        end
+      end
+    end
+  end
+
+end

config/application.rb

@@ -26,8 +26,9 @@ class Application < Rails::Application
 
     config.autoload_paths += %W(#{config.root}/lib)
 
-    config.active_job.queue_adapter = :delayed_job
 
+    config.active_job.queue_adapter = :delayed_job
+
     WillPaginate::ViewHelpers.pagination_options[:inner_window] = 1
     WillPaginate::ViewHelpers.pagination_options[:outer_window] = 0
   end

lib/messenger.rb

@@ -1,3 +1,5 @@
+USER_UNSUBSCRIBED_FROM_TWILIO_ERROR_CODE = 21610
+
 module Messenger
 
   def send_sms(number, content)
@@ -6,17 +8,24 @@ def send_sms(number, content)
 
     @client = Twilio::REST::Client.new sid, auth
 
-    from = "+14123854063 "
-
-    message = @client.account.messages.create(
-             :from => from,
-             :to => '+1'+number,
-             :body => content
-    )
-  end
+    from = "+14123854063"
 
-  def receive_sms
+    # The following try-rescue block is needed in case user unsubscribe
+    # if the user ubsubscribe and we attempt to message them
+    # the api will report an error
 
+    begin
+      message = @client.account.messages.create(
+          :from => from,
+          :to => '+1'+number,
+          :body => content
+      )
+    rescue Twilio::REST::RequestError => e
+      case e.code
+        when USER_UNSUBSCRIBED_FROM_TWILIO_ERROR_CODE
+          puts e.message
+      end
+    end
   end
-
+  
 end