new: send stock alert email when offer stock crosses threshold

When a purchase causes an offer's ``stock_current`` to drop to or below
its ``minimum_ondemand`` threshold, an email is sent to
``commande@jardinenvie.com`` using an editable mail template (Spatie
``MailTemplate``).

The check runs in ``OfferStocks::decreaseStock()`` after updating stock.
Only threshold-crossing events trigger the alert (not every low-stock
sale).  Failures are caught and logged to avoid disrupting the order
flow.

app/Mail/AlerteStock.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Mail;
+
+use App\Models\Core\Mail\MailTemplate;
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailables\Address;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Queue\SerializesModels;
+use Spatie\MailTemplates\TemplateMailable;
+
+class AlerteStock extends TemplateMailable
+{
+    use Queueable, SerializesModels;
+
+    public $subject;
+
+    public $article;
+
+    public $offre;
+
+    public $stock_restant;
+
+    public $seuil;
+
+    protected static $templateModelClass = MailTemplate::class;
+
+    public function __construct($offer)
+    {
+        $this->article = $offer->article->title ?? 'Article #'.$offer->article_id;
+        $this->offre = $offer->id;
+        $this->stock_restant = $offer->stock_current;
+        $this->seuil = $offer->minimum_ondemand;
+    }
+
+    public function envelope()
+    {
+        return new Envelope(
+            from: new Address('boutique@jardinenvie.com', 'Jardin\'en\'Vie'),
+            subject: $this->subject,
+        );
+    }
+}

app/Repositories/Shop/OfferStocks.php

@@ -2,19 +2,62 @@
 
 namespace App\Repositories\Shop;
 
+use App\Mail\AlerteStock;
 use App\Models\Shop\Offer;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Facades\Mail;
 
 class OfferStocks
 {
     public static function decreaseStock($item)
     {
         $offer = Offers::get($item['offer_id']);
+        $previousStock = $offer->stock_current;
         $offer->stock_current = $offer->stock_current - $item['quantity'];
         if ($offer->stock_current <= 0) {
             $offer->stock_current = 0;
         }
 
-        return $offer->save();
+        $saved = $offer->save();
+
+        if ($saved) {
+            self::checkStockAlert($offer, $previousStock);
+        }
+
+        return $saved;
+    }
+
+    public static function checkStockAlert($offer, $previousStock)
+    {
+        $threshold = (float) $offer->minimum_ondemand;
+        if ($threshold <= 0) {
+            return;
+        }
+
+        $crossedThreshold = $previousStock > $threshold
+            && $offer->stock_current <= $threshold;
+
+        if (! $crossedThreshold) {
+            return;
+        }
+
+        try {
+            $offer->load('article');
+            Mail::to('commande@jardinenvie.com')
+                ->send(new AlerteStock($offer));
+            Log::info('Stock alert email sent', [
+                'offer_id' => $offer->id,
+                'article' => $offer->article->name ?? $offer->article_id,
+                'stock_current' => $offer->stock_current,
+                'threshold' => $threshold,
+            ]);
+        } catch (\Throwable $e) {
+            Log::error('Failed to send stock alert email', [
+                'offer_id' => $offer->id,
+                'stock_current' => $offer->stock_current,
+                'exception' => $e->getMessage(),
+            ]);
+        }
     }
 
     public static function getStockCurrent($id)

database/migrations/shop/2026_02_13_120000_insert_mail_template_alerte_stock.php

@@ -0,0 +1,75 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        DB::table('mail_templates')->insert([
+            'mailable' => 'App\\Mail\\AlerteStock',
+            'subject' => json_encode(['fr' => '[Stock bas] {{article}} — {{stock_restant}} unités restantes'], JSON_UNESCAPED_UNICODE),
+            'html_template' => json_encode(['fr' => $this->getHtmlTemplate()], JSON_UNESCAPED_UNICODE),
+            'text_template' => json_encode(['fr' => $this->getTextTemplate()], JSON_UNESCAPED_UNICODE),
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        DB::table('mail_templates')
+            ->where('mailable', 'App\\Mail\\AlerteStock')
+            ->delete();
+    }
+
+    private function getHtmlTemplate(): string
+    {
+        return '<table style="min-width: 100%;" width="100%" cellspacing="0" cellpadding="0">'
+            .'<tbody><tr><td>'
+            .'<table style="border-collapse: collapse; background-color: #ffffff; margin: 0 auto; width: 600px;" cellspacing="0" cellpadding="0" border="0" align="center">'
+            .'<tbody><tr>'
+            .'<td style="margin: 0px auto; padding: 32px 0px 24px 4px; vertical-align: top;" align="center">'
+            .'<a href="https://www.jardinenvie.com/" style="text-decoration: none; color: #000000;">'
+            .'<img alt="Jardin\'enVie" src="https://boutique.jardinenvie.com/img/logo.png" style="margin: 0px auto; display: block;" width="300" height="138" border="0" /></a></td>'
+            .'</tr></tbody></table>'
+            .'<table style="border-collapse: collapse; background-color: #ffffff; margin: 0 auto; width: 600px;" cellspacing="0" cellpadding="0" border="0" align="center">'
+            .'<tbody><tr><td style="margin: 0 auto; padding: 0px; vertical-align: top;">'
+            .'<table style="border-collapse: collapse; margin: 0 auto; width: 512px;" cellspacing="0" cellpadding="0" border="0" align="center">'
+            .'<tbody>'
+            .'<tr><td style="font-family: \'Nunito Sans\', Arial, sans-serif; line-height: 40px; color: #000000; font-size: 28px; padding: 20px 0px 10px 0px; font-weight: 800; text-align: center;">'
+            .'Alerte stock bas</td></tr>'
+            .'<tr><td style="font-family: \'Nunito Sans\', Arial, sans-serif; line-height: 28px; color: #000000; font-size: 16px; text-align: center; padding: 10px 0 30px 0;">'
+            .'<p>Le stock de l\'article <strong>{{article}}</strong> (offre n&deg;{{offre}}) '
+            .'a atteint le seuil d\'alerte.</p>'
+            .'<p style="font-size: 24px; font-weight: bold; color: #c0392b; padding: 10px 0;">{{stock_restant}} unit&eacute;s restantes</p>'
+            .'<p>Seuil d\'alerte configur&eacute; : {{seuil}} unit&eacute;s</p>'
+            .'<p style="padding-top: 15px; color: #666;">Pensez &agrave; r&eacute;approvisionner cet article.</p>'
+            .'</td></tr>'
+            .'</tbody></table>'
+            .'</td></tr></tbody></table>'
+            .'<table style="border-collapse: collapse; background-color: #ffffff; margin: 0 auto; width: 600px; text-align: center;" cellspacing="0" cellpadding="0" border="0" align="center">'
+            .'<tbody><tr><td style="font-family: \'Nunito Sans\', Arial, sans-serif; font-size: 12px; font-weight: 600; line-height: 20px; padding: 16px; color: #999999;">'
+            .'Jardin\'enVie Artisan Semencier<br />429 route des chaux, 26500 Bourg les Valence - Dr&ocirc;me'
+            .'</td></tr></tbody></table>'
+            .'</td></tr></tbody></table>';
+    }
+
+    private function getTextTemplate(): string
+    {
+        return "ALERTE STOCK BAS\n\n"
+            ."Article : {{article}} (offre n°{{offre}})\n"
+            ."Stock restant : {{stock_restant}} unités\n"
+            ."Seuil d'alerte : {{seuil}} unités\n\n"
+            ."Pensez à réapprovisionner cet article.\n\n"
+            ."Jardin'enVie Artisan Semencier\n"
+            .'429 route des chaux, 26500 Bourg les Valence - Drôme';
+    }
+};