fix(invoices): require settlement before completion (#739)

app/Http/Requests/ChangeInvoiceStatusRequest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\Invoice;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class ChangeInvoiceStatusRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     */
+    public function rules(): array
+    {
+        return [
+            'status' => [
+                'required',
+                Rule::in([
+                    Invoice::STATUS_SENT,
+                    Invoice::STATUS_COMPLETED,
+                ]),
+            ],
+        ];
+    }
+}