add FormatterServiceInterface

src/Services/FormatterService.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Services;
+
+use Brick\Math\BigDecimal;
+use Brick\Math\RoundingMode;
+
+final readonly class FormatterService implements FormatterServiceInterface
+{
+    public function intValue(string|int|float $amount, int $decimalPlaces): string
+    {
+        return (string) BigDecimal::ten()
+            ->power($decimalPlaces)
+            ->multipliedBy(BigDecimal::of($amount))
+            ->toScale(0, RoundingMode::DOWN);
+    }
+
+    public function floatValue(string|int|float $amount, int $decimalPlaces): string
+    {
+        return (string) BigDecimal::ofUnscaledValue($amount, $decimalPlaces);
+    }
+}

src/Services/FormatterServiceInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Services;
+
+/**
+ * @internal
+ */
+interface FormatterServiceInterface
+{
+    public function intValue(string|int|float $amount, int $decimalPlaces): string;
+
+    public function floatValue(string|int|float $amount, int $decimalPlaces): string;
+}

tests/Units/Service/FormatterTest.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Test\Units\Service;
+
+use Bavix\Wallet\Internal\Exceptions\ExceptionInterface;
+use Bavix\Wallet\Services\FormatterServiceInterface;
+use Bavix\Wallet\Test\Infra\TestCase;
+
+/**
+ * @internal
+ */
+final class FormatterTest extends TestCase
+{
+    /**
+     * @throws ExceptionInterface
+     */
+    public function testFloatValueDP3(): void
+    {
+        $result = app(FormatterServiceInterface::class)->floatValue('12345', 3);
+
+        self::assertSame('12.345', $result);
+    }
+
+    /**
+     * @throws ExceptionInterface
+     */
+    public function testFloatValueDP2(): void
+    {
+        $result = app(FormatterServiceInterface::class)->floatValue('12345', 2);
+
+        self::assertSame('123.45', $result);
+    }
+
+    /**
+     * @throws ExceptionInterface
+     */
+    public function testIntValueDP3(): void
+    {
+        $result = app(FormatterServiceInterface::class)->intValue('12.345', 3);
+
+        self::assertSame('12345', $result);
+    }
+
+    /**
+     * @throws ExceptionInterface
+     */
+    public function testIntValueDP2(): void
+    {
+        $result = app(FormatterServiceInterface::class)->intValue('123.45', 2);
+
+        self::assertSame('12345', $result);
+    }
+}