chore: update document approval workflow and bug fixes

Modules/ContractorManagement/app/Enums/InvoiceStatus.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Modules\ContractorManagement\Enums;
+
+enum InvoiceStatus: string
+{
+    case Draft = 'draft';
+    case Submitted = 'submitted';
+    case Approved = 'approved';
+    case Paid = 'paid';
+    case Rejected = 'rejected';
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::Draft => 'Draft',
+            self::Submitted => 'Submitted',
+            self::Approved => 'Approved',
+            self::Paid => 'Paid',
+            self::Rejected => 'Rejected',
+        };
+    }
+
+    public function allowedTransitions(): array
+    {
+        return match ($this) {
+            self::Draft => [self::Submitted],
+            self::Submitted => [self::Approved, self::Rejected],
+            self::Approved => [self::Paid],
+            self::Paid => [],
+            self::Rejected => [self::Draft],
+        };
+    }
+}