Cost units can be edited

app/ValueObjects/Amount.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\ValueObjects;
+
+class Amount {
+    private string $currency;
+    private float $amount;
+
+    public static function fromString(string $amountString, string $currency = ' Euro') : Amount {
+        return new self(
+            (float)str_replace(',', '.', $amountString)
+            , $currency);
+    }
+
+
+    public function __construct(float $amount, string $currency) {
+        $this->currency = $currency;
+        $this->amount = $amount;
+    }
+
+    public function getAmount() : float {
+        return $this->amount;
+    }
+
+    public function getCurrency() : string {
+        return $this->currency;
+    }
+
+    public function toString() : string {
+        $value = number_format( round( $this->amount, 2 ), 2, ',', '.' );
+        return sprintf('%1$s %2$s', $value, $this->currency)
+        |> trim(...)
+        |> function (string $value) : string { return str_replace('.', ',', $value); };
+    }
+}