add how to fix bulk upload mailer

app/mailers/bulk_upload_mailer.rb

@@ -1,11 +1,30 @@
 class BulkUploadMailer < NotifyMailer
   include ActionView::Helpers::TextHelper
 
-  BULK_UPLOAD_COMPLETE_TEMPLATE_ID = "83279578-c890-4168-838b-33c9cf0dc9f0".freeze
-  BULK_UPLOAD_FAILED_CSV_ERRORS_TEMPLATE_ID = "e27abcd4-5295-48c2-b127-e9ee4b781b75".freeze
-  BULK_UPLOAD_FAILED_FILE_SETUP_ERROR_TEMPLATE_ID = "24c9f4c7-96ad-470a-ba31-eb51b7cbafd9".freeze
-  BULK_UPLOAD_FAILED_SERVICE_ERROR_TEMPLATE_ID = "c3f6288c-7a74-4e77-99ee-6c4a0f6e125a".freeze
-  BULK_UPLOAD_WITH_ERRORS_TEMPLATE_ID = "eb539005-6234-404e-812d-167728cf4274".freeze
+  COMPLETE_TEMPLATE_ID = "83279578-c890-4168-838b-33c9cf0dc9f0".freeze
+  FAILED_CSV_ERRORS_TEMPLATE_ID = "e27abcd4-5295-48c2-b127-e9ee4b781b75".freeze
+  FAILED_FILE_SETUP_ERROR_TEMPLATE_ID = "24c9f4c7-96ad-470a-ba31-eb51b7cbafd9".freeze
+  FAILED_SERVICE_ERROR_TEMPLATE_ID = "c3f6288c-7a74-4e77-99ee-6c4a0f6e125a".freeze
+  WITH_ERRORS_TEMPLATE_ID = "eb539005-6234-404e-812d-167728cf4274".freeze
+  HOW_FIX_UPLOAD_TEMPLATE_ID = "21a07b26-f625-4846-9f4d-39e30937aa24".freeze
+
+  def send_how_fix_upload_mail(bulk_upload:)
+    title = "We found #{pluralize(bulk_upload.bulk_upload_errors.count, 'error')} in your bulk upload"
+    description = "There was a problem with your #{bulk_upload.year_combo} #{bulk_upload.log_type} data. Check the error report below to fix these errors."
+    cta_link = start_bulk_upload_lettings_resume_url(bulk_upload)
+
+    send_email(
+      bulk_upload.user.email,
+      HOW_FIX_UPLOAD_TEMPLATE_ID,
+      {
+        title:,
+        filename: bulk_upload.filename,
+        upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
+        description:,
+        cta_link:,
+      },
+    )
+  end
 
   def send_bulk_upload_complete_mail(user:, bulk_upload:)
     url = if bulk_upload.lettings?
@@ -22,7 +41,7 @@ class BulkUploadMailer < NotifyMailer
 
     send_email(
       user.email,
-      BULK_UPLOAD_COMPLETE_TEMPLATE_ID,
+      COMPLETE_TEMPLATE_ID,
       {
         title:,
         filename: bulk_upload.filename,
@@ -42,7 +61,7 @@ class BulkUploadMailer < NotifyMailer
 
     send_email(
       bulk_upload.user.email,
-      BULK_UPLOAD_FAILED_CSV_ERRORS_TEMPLATE_ID,
+      FAILED_CSV_ERRORS_TEMPLATE_ID,
       {
         filename: bulk_upload.filename,
         upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
@@ -75,7 +94,7 @@ class BulkUploadMailer < NotifyMailer
 
     send_email(
       bulk_upload.user.email,
-      BULK_UPLOAD_FAILED_FILE_SETUP_ERROR_TEMPLATE_ID,
+      FAILED_FILE_SETUP_ERROR_TEMPLATE_ID,
       {
         filename: bulk_upload.filename,
         upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
@@ -96,7 +115,7 @@ class BulkUploadMailer < NotifyMailer
 
     send_email(
       bulk_upload.user.email,
-      BULK_UPLOAD_FAILED_SERVICE_ERROR_TEMPLATE_ID,
+      FAILED_SERVICE_ERROR_TEMPLATE_ID,
       {
         filename: bulk_upload.filename,
         upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
@@ -119,7 +138,7 @@ class BulkUploadMailer < NotifyMailer
 
     send_email(
       bulk_upload.user.email,
-      BULK_UPLOAD_WITH_ERRORS_TEMPLATE_ID,
+      WITH_ERRORS_TEMPLATE_ID,
       {
         title:,
         filename: bulk_upload.filename,

spec/mailers/bulk_upload_mailer_spec.rb

@@ -29,7 +29,7 @@ RSpec.describe BulkUploadMailer do
     it "sends correctly formed email" do
       expect(notify_client).to receive(:send_email).with(
         email_address: bulk_upload.user.email,
-        template_id: described_class::BULK_UPLOAD_FAILED_FILE_SETUP_ERROR_TEMPLATE_ID,
+        template_id: described_class::FAILED_FILE_SETUP_ERROR_TEMPLATE_ID,
         personalisation: {
           filename: bulk_upload.filename,
           upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
@@ -48,7 +48,7 @@ RSpec.describe BulkUploadMailer do
     it "sends correctly formed email" do
       expect(notify_client).to receive(:send_email).with(
         email_address: user.email,
-        template_id: described_class::BULK_UPLOAD_COMPLETE_TEMPLATE_ID,
+        template_id: described_class::COMPLETE_TEMPLATE_ID,
         personalisation: {
           title: "You’ve successfully uploaded 0 logs",
           filename: bulk_upload.filename,
@@ -66,7 +66,7 @@ RSpec.describe BulkUploadMailer do
     it "sends correctly formed email" do
       expect(notify_client).to receive(:send_email).with(
         email_address: user.email,
-        template_id: described_class::BULK_UPLOAD_FAILED_SERVICE_ERROR_TEMPLATE_ID,
+        template_id: described_class::FAILED_SERVICE_ERROR_TEMPLATE_ID,
         personalisation: {
           filename: bulk_upload.filename,
           upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),
@@ -94,7 +94,7 @@ RSpec.describe BulkUploadMailer do
       it "sends correctly formed email" do
         expect(notify_client).to receive(:send_email).with(
           email_address: bulk_upload.user.email,
-          template_id: described_class::BULK_UPLOAD_WITH_ERRORS_TEMPLATE_ID,
+          template_id: described_class::WITH_ERRORS_TEMPLATE_ID,
           personalisation: {
             title: "We found 1 log with errors",
             filename: bulk_upload.filename,
@@ -119,7 +119,7 @@ RSpec.describe BulkUploadMailer do
       it "sends correctly formed email" do
         expect(notify_client).to receive(:send_email).with(
           email_address: user.email,
-          template_id: described_class::BULK_UPLOAD_FAILED_CSV_ERRORS_TEMPLATE_ID,
+          template_id: described_class::FAILED_CSV_ERRORS_TEMPLATE_ID,
           personalisation: {
             filename: bulk_upload.filename,
             upload_timestamp: bulk_upload.created_at.to_fs(:govuk_date_and_time),