feat(admin): email affected customers when maintenance is cancelled (ledger-guarded)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Livewire/Admin/Maintenance.php

@@ -3,10 +3,13 @@
 namespace App\Livewire\Admin;
 
 use App\Mail\MaintenanceAnnouncementMail;
+use App\Mail\MaintenanceCancelledMail;
+use App\Models\Customer;
 use App\Models\Datacenter;
 use App\Models\Host;
 use App\Models\MaintenanceNotification;
 use App\Models\MaintenanceWindow;
+use Illuminate\Mail\Mailable;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Mail;
@@ -147,33 +150,53 @@ class Maintenance extends Component
         if ($window === null || $window->state === 'cancelled') {
             return;
         }
+        $wasPublished = $window->state === 'scheduled';
         $window->update(['state' => 'cancelled', 'cancelled_at' => now()]);
+
+        // Customers who received an announcement must be told it's cancelled.
+        if ($wasPublished) {
+            $notified = MaintenanceNotification::query()
+                ->where('maintenance_window_id', $window->id)
+                ->where('event', 'announcement')
+                ->pluck('customer_id');
+            foreach (Customer::query()->whereIn('id', $notified)->get() as $customer) {
+                $this->deliverOnce($window, $customer, 'cancelled', new MaintenanceCancelledMail($window, $customer));
+            }
+        }
+
         $this->dispatch('notify', message: __('maintenance.cancelled'));
     }
 
-    /** Send the announcement to each affected customer exactly once (ledger-guarded). */
+    /** Announce to each affected customer exactly once (ledger-guarded). */
     private function sendAnnouncements(MaintenanceWindow $window): void
     {
         foreach ($window->affectedCustomers() as $customer) {
-            $delivery = MaintenanceNotification::query()->firstOrCreate(
-                ['maintenance_window_id' => $window->id, 'customer_id' => $customer->id, 'event' => 'announcement'],
-                ['email' => $customer->email],
-            );
-            if ($delivery->wasRecentlyCreated) {
-                // The ledger row is the idempotency marker (queue at most once).
-                // If dispatch itself fails, drop the row so a re-publish retries;
-                // sent_at stays null until real delivery (a MessageSent listener
-                // could stamp it) — we never claim delivery merely on dispatch.
-                try {
-                    Mail::to($customer->email)
-                        ->locale($customer->locale ?: config('app.locale'))
-                        ->queue(new MaintenanceAnnouncementMail($window, $customer));
-                } catch (\Throwable $e) {
-                    $delivery->delete();
+            $this->deliverOnce($window, $customer, 'announcement', new MaintenanceAnnouncementMail($window, $customer));
+        }
+    }
 
-                    throw $e;
-                }
-            }
+    /**
+     * Queue one mail per (window, customer, event). The ledger row is the
+     * idempotency marker; if dispatch itself fails, drop the row so it retries.
+     * sent_at stays null until real delivery — we never claim delivery on dispatch.
+     */
+    private function deliverOnce(MaintenanceWindow $window, Customer $customer, string $event, Mailable $mail): void
+    {
+        $delivery = MaintenanceNotification::query()->firstOrCreate(
+            ['maintenance_window_id' => $window->id, 'customer_id' => $customer->id, 'event' => $event],
+            ['email' => $customer->email],
+        );
+        if (! $delivery->wasRecentlyCreated) {
+            return;
+        }
+        try {
+            Mail::to($customer->email)
+                ->locale($customer->locale ?: config('app.locale'))
+                ->queue($mail);
+        } catch (\Throwable $e) {
+            $delivery->delete();
+
+            throw $e;
         }
     }
 

app/Mail/MaintenanceCancelledMail.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Mail;
+
+use App\Models\Customer;
+use App\Models\MaintenanceWindow;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+
+class MaintenanceCancelledMail extends Mailable implements ShouldQueue
+{
+    use Queueable, SerializesModels;
+
+    public function __construct(
+        public MaintenanceWindow $window,
+        public Customer $customer,
+    ) {}
+
+    public function envelope(): Envelope
+    {
+        return new Envelope(subject: __('maintenance.mail_cancel_subject', ['title' => $this->window->title]));
+    }
+
+    public function content(): Content
+    {
+        return new Content(markdown: 'mail.maintenance-cancelled', with: [
+            'title' => $this->window->title,
+            'name' => $this->customer->name,
+        ]);
+    }
+}

lang/de/maintenance.php

@@ -49,4 +49,8 @@ return [
     'mail_window' => 'Zeitraum: :start bis :end.',
     'mail_no_action' => 'Es ist nichts zu tun. Ihre Daten bleiben sicher.',
     'mail_signoff' => 'Viele Grüße',
+
+    'mail_cancel_subject' => 'Wartung abgesagt: :title',
+    'mail_cancel_heading' => 'Wartung abgesagt',
+    'mail_cancel_body' => 'Die geplante Wartung „:title" wurde abgesagt. Es ist nichts weiter zu tun.',
 ];

lang/en/maintenance.php

@@ -49,4 +49,8 @@ return [
     'mail_window' => 'Window: :start to :end.',
     'mail_no_action' => 'No action is required. Your data stays safe.',
     'mail_signoff' => 'Best regards',
+
+    'mail_cancel_subject' => 'Maintenance cancelled: :title',
+    'mail_cancel_heading' => 'Maintenance cancelled',
+    'mail_cancel_body' => 'The scheduled maintenance “:title” has been cancelled. Nothing further is needed.',
 ];

resources/views/mail/maintenance-cancelled.blade.php

@@ -0,0 +1,10 @@
+<x-mail::message>
+# {{ __('maintenance.mail_cancel_heading') }}
+
+{{ __('maintenance.mail_greeting', ['name' => $name]) }}
+
+{{ __('maintenance.mail_cancel_body', ['title' => $title]) }}
+
+{{ __('maintenance.mail_signoff') }}<br>
+{{ config('app.name') }}
+</x-mail::message>

tests/Feature/Admin/MaintenanceTest.php

@@ -44,6 +44,23 @@ it('publishes a window and emails affected customers once (idempotent)', functio
     ]))->toThrow(Illuminate\Database\UniqueConstraintViolationException::class);
 });
 
+it('emails a cancellation to customers who were announced', function () {
+    Mail::fake();
+    $host = Host::factory()->active()->create();
+    $customer = affectedCustomerOn($host);
+    $window = MaintenanceWindow::factory()->scheduled()->create();
+    $window->hosts()->attach($host->id);
+    // Simulate the customer having received the announcement.
+    \App\Models\MaintenanceNotification::create([
+        'maintenance_window_id' => $window->id, 'customer_id' => $customer->id, 'event' => 'announcement', 'email' => $customer->email,
+    ]);
+
+    Livewire::actingAs(operator('Owner'))->test(Maintenance::class)->call('cancel', $window->uuid);
+
+    expect($window->fresh()->state)->toBe('cancelled');
+    Mail::assertQueued(\App\Mail\MaintenanceCancelledMail::class, 1);
+});
+
 it('requires a host to publish', function () {
     Livewire::actingAs(operator('Owner'))->test(Maintenance::class)
         ->set('title', 'X')