Email volunteers when their reimbursement request is marked complete

app/mailers/volunteer_mailer.rb

@@ -18,4 +18,11 @@ def case_contacts_reminder(user, cc_recipients)
     @casa_organization = user.casa_org
     mail(to: @user.email, cc: cc_recipients, subject: "Reminder to input case contacts")
   end
+
+  def reimbursement_complete_email(user, case_contact)
+    @user = user
+    @case_contact = case_contact
+    @casa_organization = @user.casa_org
+    mail(to: @user.email, subject: "Your reimbursement request has been processed")
+  end
 end

app/notifications/reimbursement_complete_notifier.rb

@@ -3,12 +3,16 @@
 # ReimbursementCompleteNotifier.with(case_contact: @case_contact).deliver(current_user)
 #
 class ReimbursementCompleteNotifier < BaseNotifier
-  # deliver_by :email do |config|
-  #   config.mailer = "UserMailer"
-  #   ...
-  # end
-  # deliver_by :slack
-  # deliver_by :custom, class: "MyDeliveryMethod"
+  # This notifier is delivered to both the volunteer who submitted the
+  # reimbursement and their supervisor (see ReimbursementsController#change_complete_status).
+  # The email delivery is scoped to volunteer recipients only, since the
+  # supervisor already knows they just marked it complete.
+  deliver_by :email do |config|
+    config.mailer = "VolunteerMailer"
+    config.method = "reimbursement_complete_email"
+    config.args = -> { [recipient, params[:case_contact]] }
+    config.if = -> { recipient.volunteer? && recipient.receive_email_notifications? }
+  end
 
   required_param :case_contact
 

app/views/volunteer_mailer/reimbursement_complete_email.html.erb

@@ -0,0 +1,29 @@
+<meta itemprop="name" content="Reimbursement Processed" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+<style>/* Email styles need to be inline */</style>
+<table width="100%" cellpadding="0" cellspacing="0" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+  <tr style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+    <td class="content-block" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; vertical-align: top; margin: 0; padding: 0 0 20px;" valign="top">
+      Hello <%= @user.display_name %>,
+    </td>
+  </tr>
+  <tr style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+    <td class="content-block" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; vertical-align: top; margin: 0; padding: 0 0 20px;" valign="top">
+      Your reimbursement request for <%= @case_contact.miles_driven %>mi
+      <% if @case_contact.reimbursement_amount %>
+        (<%= number_to_currency(@case_contact.reimbursement_amount) %>)
+      <% end %>
+      on <%= @case_contact.occurred_at_display %> has been processed and is en route.
+    </td>
+  </tr>
+  <tr style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+    <td class="content-block" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; vertical-align: top; margin: 0; padding: 0 0 20px;" valign="top">
+      You can view your case contacts and their reimbursement status by visiting
+      <a href="<%= "#{case_contacts_url(casa_case_id: @case_contact.casa_case_id)}" %>" target="_blank">this link</a>.
+    </td>
+  </tr>
+  <tr style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; margin: 0;">
+    <td class="content-block" style="font-family: Helvetica,Arial,sans-serif; box-sizing: border-box; font-size: 14px; vertical-align: top; margin: 0; padding: 0 0 20px;" valign="top">
+      If you have any questions, please contact your most recent CASA supervisor for assistance.
+    </td>
+  </tr>
+</table>

lib/mailers/debug_preview_mailer.rb

@@ -7,4 +7,17 @@ def invalid_user(role)
       body: "User does not exist or is not a #{role}"
     )
   end
+
+  # Use when the looked-up user is valid but has no related record to preview
+  # with, e.g. a volunteer with no case contact wanting reimbursement. Keeps
+  # the "missing_#{role}@example.com" convention so existing preview specs
+  # asserting on that address don't need to change.
+  def no_data(role)
+    mail(
+      from: "reply@example.com",
+      to: "missing_#{role}@example.com",
+      subject: "no_preview_data",
+      body: "No #{role} record was found to preview"
+    )
+  end
 end

lib/mailers/previews/volunteer_mailer_preview.rb

@@ -28,5 +28,23 @@ def case_contacts_reminder
       VolunteerMailer.court_report_reminder(volunteer, true)
     end
   end
+
+  # Unlike the other previews above, a valid volunteer here isn't enough on
+  # its own, they also need a case contact wanting reimbursement to render
+  # against. If they don't have one, DebugPreviewMailer.no_data renders that
+  # distinctly from invalid_user, which is reserved for a failed ID lookup.
+  def reimbursement_complete_email
+    volunteer = params.has_key?(:id) ? Volunteer.find_by(id: params[:id]) : Volunteer.last
+    if volunteer.nil?
+      DebugPreviewMailer.invalid_user("volunteer")
+    else
+      case_contact = CaseContact.where(creator: volunteer, want_driving_reimbursement: true).last
+      if case_contact.nil?
+        DebugPreviewMailer.no_data("case_contact")
+      else
+        VolunteerMailer.reimbursement_complete_email(volunteer, case_contact)
+      end
+    end
+  end
 end
 # :nocov:

spec/mailers/previews/volunteer_mailer_preview_spec.rb

@@ -72,4 +72,39 @@
       it { expect(email.to).to eq ["missing_volunteer@example.com"] }
     end
   end
+
+  describe "#reimbursement_complete_email" do
+    let!(:case_contact) { create(:case_contact, :wants_reimbursement, creator: volunteer) }
+
+    context "When no ID is passed" do
+      let(:preview) { described_class.new }
+      let(:email) { preview.reimbursement_complete_email }
+
+      it { expect(email.to).to eq [volunteer.email] }
+    end
+
+    context "When passed ID is valid" do
+      let(:preview) { described_class.new(id: volunteer.id) }
+      let(:email) { preview.reimbursement_complete_email }
+
+      it { expect(email.to).to eq [volunteer.email] }
+    end
+
+    context "When passed ID is invalid" do
+      let(:preview) { described_class.new(id: -1) }
+      let(:email) { preview.reimbursement_complete_email }
+
+      it { expect(email.to).to eq ["missing_volunteer@example.com"] }
+    end
+
+    context "When the volunteer has no case contact wanting reimbursement" do
+      let(:other_volunteer) { create(:volunteer) }
+      let(:preview) { described_class.new(id: other_volunteer.id) }
+      let(:email) { preview.reimbursement_complete_email }
+
+      it "does not fall back to a different volunteer's case contact" do
+        expect(email.to).to eq ["missing_case_contact@example.com"]
+      end
+    end
+  end
 end

spec/mailers/volunteer_mailer_spec.rb

@@ -41,6 +41,26 @@
     end
   end
 
+  describe ".reimbursement_complete_email" do
+    let(:case_contact) { create(:case_contact, :wants_reimbursement, creator: volunteer) }
+    let(:mail) { VolunteerMailer.reimbursement_complete_email(volunteer, case_contact) }
+
+    it "sends an email confirming the reimbursement was processed" do
+      expect(mail.to).to eq([volunteer.email])
+      expect(mail.subject).to eq("Your reimbursement request has been processed")
+      expect(mail.body.encoded).to match("#{case_contact.miles_driven}mi")
+      expect(mail.body.encoded).to match(case_contact.occurred_at_display)
+    end
+
+    context "when the casa org has a mileage rate" do
+      let!(:mileage_rate) { create(:mileage_rate, casa_org: case_contact.casa_case.casa_org, amount: 6.50, effective_date: 3.days.ago) }
+
+      it "includes the reimbursement amount" do
+        expect(mail.body.encoded).to match("$")
+      end
+    end
+  end
+
   describe ".invitation_instructions for a volunteer" do
     let(:mail) { volunteer.invite! }
     let(:expiration_date) { I18n.l(volunteer.invitation_due_at, format: :full, default: nil) }

spec/notifications/reimbursement_complete_notifier_spec.rb

@@ -1,6 +1,8 @@
 require "rails_helper"
 
 RSpec.describe ReimbursementCompleteNotifier, type: :model do
+  include ActiveJob::TestHelper
+
   describe "title" do
     it "returns 'Reimbursement Approved'" do
       case_contact = build(:case_contact, :wants_reimbursement)
@@ -31,6 +33,40 @@
     end
   end
 
+  describe "email delivery" do
+    let(:volunteer) { create(:volunteer, receive_email_notifications: true) }
+    let(:supervisor) { create(:supervisor, receive_email_notifications: true) }
+    let(:case_contact) { create(:case_contact, :wants_reimbursement, creator: volunteer) }
+
+    it "emails the volunteer recipient" do
+      perform_enqueued_jobs do
+        ReimbursementCompleteNotifier.with(case_contact: case_contact).deliver(volunteer)
+      end
+
+      expect(ActionMailer::Base.deliveries.map(&:to).flatten).to include(volunteer.email)
+    end
+
+    it "does not email a volunteer who has opted out of email notifications" do
+      # UserValidator requires at least one communication channel enabled, so
+      # disabling email requires enabling SMS, which in turn requires a phone number.
+      volunteer.update!(receive_email_notifications: false, receive_sms_notifications: true, phone_number: "5555555555")
+
+      perform_enqueued_jobs do
+        ReimbursementCompleteNotifier.with(case_contact: case_contact).deliver(volunteer)
+      end
+
+      expect(ActionMailer::Base.deliveries.map(&:to).flatten).not_to include(volunteer.email)
+    end
+
+    it "does not email a supervisor recipient" do
+      perform_enqueued_jobs do
+        ReimbursementCompleteNotifier.with(case_contact: case_contact).deliver(supervisor)
+      end
+
+      expect(ActionMailer::Base.deliveries.map(&:to).flatten).not_to include(supervisor.email)
+    end
+  end
+
   describe "url" do
     it "returns the case contacts URL path for the given case contact" do
       case_contact = create(:case_contact, :wants_reimbursement)