format usage estimates refactoring & test

src/App/Users/Actions/FormatUsageEstimatesAction.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Users\Actions;
+
+use ByteUnits\Metric;
+use Illuminate\Support\Collection;
+
+class FormatUsageEstimatesAction
+{
+    public function __invoke(string $currency, Collection $usage)
+    {
+        return $usage->map(function ($estimate) use ($currency) {
+
+            // Format usage
+            $usage = match ($estimate['feature']) {
+                'bandwidth' => Metric::megabytes($estimate['usage'])->format(),
+                'storage' => Metric::megabytes($estimate['usage'])->format(),
+            };
+
+            // Normalize units
+            $amount = $estimate['amount'] / 1000;
+
+            return [
+                'feature' => $estimate['feature'],
+                'amount'  => $amount,
+                'cost'    => format_currency($amount, $currency),
+                'usage'   => $usage,
+            ];
+        });
+    }
+}