package com.bookshop.structural.adapter;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import com.bookshop.domain.Customer;
import java.math.BigDecimal;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

@DisplayName("Adapter -- checkout talks pounds and domain objects, the legacy gateway never leaks")
class LegacyGatewayAdapterTest {

    private final CardPayments payments = new LegacyGatewayAdapter(new LegacyPaymentGateway());
    private final Customer alice = new Customer("42", "Alice", "alice@example.com", 0);

    @Test
    @DisplayName("a clean domain call is translated into the gateway's reference-and-pence API")
    void successfulChargeIsTranslated() {
        PaymentResult result = payments.charge(alice, new BigDecimal("19.99"));

        assertTrue(result.successful());
    }

    @Test
    @DisplayName("magic status codes come back as meaningful domain results")
    void statusCodesBecomeMeaningfulResults() {
        PaymentResult result = payments.charge(alice, new BigDecimal("2000.00"));

        assertFalse(result.successful());
        assertEquals("insufficient funds", result.message());
    }
}

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