From eca5238abd2658c0122699b066c82cb431692442 Mon Sep 17 00:00:00 2001
From: Linus Gasser <linus.gasser@epfl.ch>
Date: Fri, 10 Oct 2025 17:16:25 +0200
Subject: [PATCH] Adding bulk email functionality

---
 app/controllers/admin/emails_controller.rb | 54 +++++++++++++++++++
 app/mailers/mailbot.rb                     |  7 +++
 app/views/admin/emails/bulk.html.haml      | 61 ++++++++++++++++++++++
 app/views/admin/emails/index.html.haml     | 13 +++++
 config/routes.rb                           |  7 ++-
 5 files changed, 141 insertions(+), 1 deletion(-)
 create mode 100644 app/views/admin/emails/bulk.html.haml

diff --git a/app/controllers/admin/emails_controller.rb b/app/controllers/admin/emails_controller.rb
index ba456efe..f9aa4200 100644
--- a/app/controllers/admin/emails_controller.rb
+++ b/app/controllers/admin/emails_controller.rb
@@ -22,8 +22,62 @@ module Admin
       @settings = @conference.email_settings
     end
 
+    def bulk
+      authorize! :index, @conference.email_settings
+      @registrations = @conference.registrations.includes(:user, :qanswers)
+      @questions = @conference.questions.includes(:qanswers)
+    end
+
+    def send_bulk
+      authorize! :index, @conference.email_settings
+
+      subject = params[:subject]
+      body = params[:body]
+      filter_type = params[:filter_type]
+
+      if subject.blank? || body.blank?
+        redirect_to bulk_admin_conference_emails_path(@conference.short_title), alert: 'Subject and body are required.'
+        return
+      end
+
+      recipients = get_filtered_recipients(filter_type)
+
+      if recipients.empty?
+        redirect_to bulk_admin_conference_emails_path(@conference.short_title), alert: 'No recipients found with the selected filter.'
+        return
+      end
+
+      recipients.each do |user|
+        Mailbot.bulk_mail(@conference, user, subject, body).deliver_later
+      end
+
+      redirect_to bulk_admin_conference_emails_path(@conference.short_title),
+                  notice: "Bulk email sent to #{recipients.count} recipients."
+    end
+
     private
 
+    def get_filtered_recipients(filter_type)
+      registrations = @conference.registrations.includes(:user, :qanswers)
+
+      case filter_type
+      when 'no_questions_answered'
+        registrations.select { |r| r.qanswers.empty? }.map(&:user)
+      when 'some_questions_answered'
+        registrations.select { |r| r.qanswers.any? && r.qanswers.count < @conference.questions.count }.map(&:user)
+      when 'all_questions_answered'
+        registrations.select { |r| r.qanswers.count >= @conference.questions.count }.map(&:user)
+      when 'all_registered'
+        registrations.map(&:user)
+      else
+        []
+      end
+    end
+
+    def bulk_email_params
+      params.permit(:subject, :body, :filter_type)
+    end
+
     def email_params
       params.require(:email_settings).permit(:send_on_registration,
                                              :send_on_accepted, :send_on_rejected, :send_on_confirmed_without_registration,
diff --git a/app/mailers/mailbot.rb b/app/mailers/mailbot.rb
index 52e15b80..7561a912 100644
--- a/app/mailers/mailbot.rb
+++ b/app/mailers/mailbot.rb
@@ -137,4 +137,11 @@ class Mailbot < ActionMailer::Base
          template_name: 'comment_template',
          subject:       "New comment has been posted for #{@event.title}")
   end
+
+  def bulk_mail(conference, user, subject, body)
+    mail(to:      user.email,
+         from:    conference.contact.email,
+         subject: subject,
+         body:    EmailSettings.new.generate_email_on_conf_updates(conference, user, body))
+  end
 end
diff --git a/app/views/admin/emails/bulk.html.haml b/app/views/admin/emails/bulk.html.haml
new file mode 100644
index 00000000..a3b3b245
--- /dev/null
+++ b/app/views/admin/emails/bulk.html.haml
@@ -0,0 +1,61 @@
+.row
+  .col-md-8
+    %h2 Bulk Email
+    %p Send customized emails to registered users based on their registration status.
+
+    = form_tag send_bulk_admin_conference_emails_path(@conference.short_title), method: :post, class: 'form-horizontal' do
+      .form-group
+        = label_tag :subject, 'Subject', class: 'col-sm-2 control-label'
+        .col-sm-10
+          = text_field_tag :subject, params[:subject], class: 'form-control', required: true
+
+      .form-group
+        = label_tag :body, 'Body', class: 'col-sm-2 control-label'
+        .col-sm-10
+          = text_area_tag :body, params[:body], rows: 10, class: 'form-control', required: true
+          %p.help-block You can use the following variables in your email: {name}, {conference}, {registrationlink}
+
+      .form-group
+        = label_tag :filter_type, 'Send to', class: 'col-sm-2 control-label'
+        .col-sm-10
+          = select_tag :filter_type, options_for_select([
+            ['All registered users', 'all_registered'],
+            ['Users who haven\'t answered any questions', 'no_questions_answered'],
+            ['Users who answered some but not all questions', 'some_questions_answered'],
+            ['Users who answered all questions', 'all_questions_answered']
+          ], params[:filter_type]), { class: 'form-control', required: true }
+
+      - if @questions.any?
+        .form-group
+          .col-sm-offset-2.col-sm-10
+            %h4 Registration Questions
+            %ul
+              - @questions.each do |question|
+                %li= question.title
+
+      .form-group
+        .col-sm-offset-2.col-sm-10
+          = submit_tag 'Send Bulk Email', class: 'btn btn-primary', data: { confirm: 'Are you sure you want to send this email to all selected recipients?' }
+          = link_to 'Cancel', admin_conference_emails_path(@conference.short_title), class: 'btn btn-default'
+
+  .col-md-4
+    .panel.panel-default
+      .panel-heading
+        %h4 Recipient Preview
+      .panel-body
+        %p
+          %strong All registered users:
+          = @conference.registrations.count
+        - if @questions.any?
+          %p
+            %strong No questions answered:
+            = @registrations.select { |r| r.qanswers.empty? }.count
+          %p
+            %strong Some questions answered:
+            = @registrations.select { |r| r.qanswers.any? && r.qanswers.count < @questions.count }.count
+          %p
+            %strong All questions answered:
+            = @registrations.select { |r| r.qanswers.count >= @questions.count }.count
+        - else
+          %p
+            %em No registration questions configured for this conference.
diff --git a/app/views/admin/emails/index.html.haml b/app/views/admin/emails/index.html.haml
index e296d824..dc4cd328 100644
--- a/app/views/admin/emails/index.html.haml
+++ b/app/views/admin/emails/index.html.haml
@@ -16,6 +16,8 @@
                 %a{ 'aria-controls' => 'cfp', 'data-toggle' => 'tab', href: '#cfp', role: 'tab' } Call for Papers
               %li{ role: 'presentation' }
                 %a{ 'aria-controls' => 'booths', 'data-toggle' => 'tab', href: '#booth', role: 'tab' } Booth
+              %li{ role: 'presentation' }
+                %a{ 'aria-controls' => 'bulk', 'data-toggle' => 'tab', href: '#bulk', role: 'tab' } Bulk Email
             / Tab panes
             .tab-content
               #onboarding.tab-pane.active{ role: 'tabpanel' }
@@ -211,6 +213,17 @@
                 'data-body-text' => "Dear {name},\n\nThank you for your #{t'booth'} request {booth_title} for the conference {conference}.\n\nUnfortunately, we are sorry to inform you that your request has been rejected.\n\n\nBest wishes\n\n{conference} Team" } Load Template
                 %a.btn.btn-link.control_label.template_help_link{ 'data-name' => 'booth_rejection_help' } Show help
                 =  render partial: 'help', locals: {id: 'booth_rejection_help', show_event_variables: false}
+              #bulk.tab-pane{ role: 'tabpanel' }
+                %p Send customized emails to registered users based on their registration status.
+                .form-group
+                  = link_to 'Go to Bulk Email', bulk_admin_conference_emails_path(@conference.short_title), class: 'btn btn-success'
+                %p
+                  %strong Available filters:
+                %ul
+                  %li All registered users
+                  %li Users who haven't answered any registration questions
+                  %li Users who answered some but not all questions
+                  %li Users who answered all questions
 
       .row
         .col-md-12
diff --git a/config/routes.rb b/config/routes.rb
index 730d43cf..04dba8cd 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -115,7 +115,12 @@ Osem::Application.routes.draw do
       resources :tickets
       resources :sponsors, except: [:show]
       resources :lodgings, except: [:show]
-      resources :emails, only: [:show, :update, :index]
+      resources :emails, only: [:show, :update, :index] do
+        collection do
+          get :bulk
+          post :send_bulk
+        end
+      end
       resources :physical_tickets, only: [:index]
       resources :roles, except: [:new, :create] do
         member do