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Gemfile

@@ -29,6 +29,8 @@ gem "discard"
 gem "activeadmin"
 # Admin charts
 gem "chartkick"
+# Spreadsheet parsing
+gem "roo"
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

Gemfile.lock

@@ -292,6 +292,9 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     rexml (3.2.5)
+    roo (2.8.3)
+      nokogiri (~> 1)
+      rubyzip (>= 1.3.0, < 3.0.0)
     rubocop (1.21.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
@@ -405,6 +408,7 @@ DEPENDENCIES
   puma (~> 5.0)
   rack-mini-profiler (~> 2.0)
   rails (~> 6.1.4)
+  roo
   rspec-core!
   rspec-expectations!
   rspec-mocks!

app/controllers/bulk_upload_controller.rb

@@ -1,5 +1,13 @@
 class BulkUploadController < ApplicationController
+  XLS = "application/vnd.ms-excel".freeze
+
   def show
     render "case_logs/bulk_upload"
   end
+
+  def process_bulk_upload
+    if params["case_log_bulk_upload"].content_type == XLS
+      xlsx = Roo::Spreadsheet.open(params["case_log_bulk_upload"].tempfile, extension: :xlsx)
+    end
+  end
 end

app/views/case_logs/bulk_upload.html.erb

@@ -1,10 +1,9 @@
-<h1 class="govuk-heading-xl">
-  Bulk Upload
-</h1>
-
 <div class="govuk-form-group">
-  <label class="govuk-label" for="file-upload-1">
-    Upload a file
-  </label>
-  <input class="govuk-file-upload" id="file-upload-1" name="file-upload-1" type="file">
+  <%= form_with url: "/case_logs/bulk_upload", method: "post", builder: GOVUKDesignSystemFormBuilder::FormBuilder do |f| %>
+    <%= f.govuk_file_field :case_log_bulk_upload,
+        label: { text: "Bulk Upload", size: "l" },
+        hint: { text: "Upload a spreadsheet using the template" }
+    %>
+    <%= f.govuk_submit "Upload"  %>
+  <% end %>
 </div>

config/routes.rb

@@ -4,7 +4,8 @@ Rails.application.routes.draw do
   root to: "test#index"
   get "about", to: "about#index"
 
-  post "/case_logs/:id", to: "case_logs#submit_form"
+  post "/case_logs/:id", to: "case_logs#submit_form", constraints: { id: /\d/ }
+  post "/case_logs/bulk_upload", to: "bulk_upload#process_bulk_upload"
   get "/case_logs/bulk_upload", to: "bulk_upload#show"
 
   form_handler = FormHandler.instance