TrivialService

Author: arokettu

src/Services/TrivialService.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Peso\Core\Services;
+
+use Arokettu\Date\Date;
+use Override;
+use Peso\Core\Exceptions\ExchangeRateNotFoundException;
+use Peso\Core\Exceptions\RequestNotSupportedException;
+use Peso\Core\Requests\CurrentExchangeRateRequest;
+use Peso\Core\Requests\HistoricalExchangeRateRequest;
+use Peso\Core\Responses\ErrorResponse;
+use Peso\Core\Responses\ExchangeRateResponse;
+use Peso\Core\Types\Decimal;
+
+final readonly class TrivialService implements PesoServiceInterface
+{
+    #[Override]
+    public function send(object $request): ExchangeRateResponse|ErrorResponse
+    {
+        if ($request instanceof CurrentExchangeRateRequest || $request instanceof HistoricalExchangeRateRequest) {
+            if ($request->baseCurrency === $request->quoteCurrency) {
+                return new ExchangeRateResponse(new Decimal('1'), Date::today());
+            } else {
+                return new ErrorResponse(ExchangeRateNotFoundException::fromRequest($request));
+            }
+        }
+
+        return new ErrorResponse(RequestNotSupportedException::fromRequest($request));
+    }
+
+    #[Override]
+    public function supports(object $request): bool
+    {
+        return
+            ($request instanceof CurrentExchangeRateRequest || $request instanceof HistoricalExchangeRateRequest) &&
+            $request->baseCurrency === $request->quoteCurrency;
+    }
+}

tests/Services/TrivialServiceTest.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Peso\Core\Tests\Services;
+
+use Arokettu\Date\Calendar;
+use Arokettu\Date\Date;
+use Peso\Core\Exceptions\ExchangeRateNotFoundException;
+use Peso\Core\Exceptions\RequestNotSupportedException;
+use Peso\Core\Requests\CurrentConversionRequest;
+use Peso\Core\Requests\CurrentExchangeRateRequest;
+use Peso\Core\Requests\HistoricalExchangeRateRequest;
+use Peso\Core\Responses\ErrorResponse;
+use Peso\Core\Responses\ExchangeRateResponse;
+use Peso\Core\Services\TrivialService;
+use Peso\Core\Types\Decimal;
+use PHPUnit\Framework\TestCase;
+
+final class TrivialServiceTest extends TestCase
+{
+    public function testSupports(): void
+    {
+        $service = new TrivialService();
+
+        self::assertTrue($service->supports(new CurrentExchangeRateRequest('EUR', 'EUR')));
+        self::assertTrue($service->supports(new HistoricalExchangeRateRequest('PHP', 'PHP', Date::today())));
+        self::assertFalse($service->supports(new CurrentExchangeRateRequest('TRY', 'RUB')));
+        self::assertFalse($service->supports(new HistoricalExchangeRateRequest('HUF', 'ZAR', Date::today())));
+        self::assertFalse($service->supports(new CurrentConversionRequest(Decimal::init(1), 'EUR', 'EUR')));
+    }
+
+    public function testRate(): void
+    {
+        $service = new TrivialService();
+
+        $response = $service->send(new CurrentExchangeRateRequest('EUR', 'EUR'));
+        self::assertInstanceOf(ExchangeRateResponse::class, $response);
+        self::assertEquals('1', $response->rate->value);
+
+        $response = $service->send(new HistoricalExchangeRateRequest('HUF', 'HUF', Calendar::parse('2025-06-13')));
+        self::assertInstanceOf(ExchangeRateResponse::class, $response);
+        self::assertEquals('1', $response->rate->value);
+
+        $response = $service->send(new CurrentExchangeRateRequest('USD', 'CAD'));
+        self::assertInstanceOf(ErrorResponse::class, $response);
+        self::assertInstanceOf(ExchangeRateNotFoundException::class, $response->exception);
+        self::assertEquals('Unable to find exchange rate for USD/CAD', $response->exception->getMessage());
+
+        // does not perform conversions
+        $response = $service->send(new CurrentConversionRequest(Decimal::init('1.00'), 'USD', 'USD'));
+        self::assertInstanceOf(ErrorResponse::class, $response);
+        self::assertInstanceOf(RequestNotSupportedException::class, $response->exception);
+        self::assertEquals(
+            'Unsupported request type: "Peso\Core\Requests\CurrentConversionRequest"',
+            $response->exception->getMessage(),
+        );
+    }
+}