Add Slack customer registration notification functionality

services/nginx/app/classes/slack.php

@@ -6,13 +6,25 @@ use GuzzleHttp\Client;
 use interfaces\notification_i;
 use objects\departments_o;
 use objects\users_o;
+use slack\slack_c;
 use traits\notification_t;
 
+require_once WD . '/modules/slack/slack_c.php';
 
 class slack implements notification_i
 {
     use notification_t;
 
+    private ?slack_c $config = null;
+
+    public function getConfig(): slack_c
+    {
+        if ($this->config === null) {
+            $this->config = new slack_c();
+        }
+
+        return $this->config;
+    }
 
     /**
      * @inheritdoc
@@ -132,4 +144,38 @@ class slack implements notification_i
         // Send the message to the slack webhook
         self::add_log(self::send_webhook_message($string, $SLACK_DEFAULT_WEBHOOK));
     }
-}
+
+    public function send_customer_registration_notification(int $customer_number): self
+    {
+        $webhook = trim((string)$this->getConfig()->customer_registration_webhook_url->getVariableValue());
+        if ($webhook === '') {
+            return $this;
+        }
+
+        self::add_log(self::send_webhook_message(
+            $this->format_customer_registration($customer_number),
+            $webhook
+        ));
+
+        return $this;
+    }
+
+    public function format_customer_registration(int $customer_number): string
+    {
+        $customer = (new users_o())->getUserByCustomerNumber($customer_number);
+        $customerName = $customer->exists()
+            ? $customer->getCustomerName((int)$customer->customer_number->value())
+            : '';
+        $customerName = trim((string)$customerName);
+        if ($customerName === '') {
+            $customerName = 'Unknown customer';
+        }
+
+        $safeCustomerNumber = (int)$customer_number;
+        $customerUrl = 'https://truckwash.io/superuser/users?search=' . $safeCustomerNumber;
+
+        return "*New customer registered on Truck Wash*\n"
+            . "Customer: $customerName ($safeCustomerNumber)\n"
+            . "Open in Superuser: $customerUrl";
+    }
+}