package com.ankurm.resttestclient;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.server.LocalServerPort;
import org.springframework.http.client.JdkClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestClient;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * Not a RestTestClient test -- this is plain {@code RestClient} against the same running
 * server, isolating exactly one variable: which {@link org.springframework.http.client.ClientHttpRequestFactory}
 * handles the socket. It exists to prove the claim made in {@link PersonEndToEndTest}: that
 * "bind to a real server" does not by itself guarantee you can observe real HTTP-level
 * behavior, because the client you get by default may have already undone it for you.
 */
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class HttpClientChoiceComparisonTest {

    @LocalServerPort
    int port;

    @Test
    void theJdkHttpClientDecodesGzipAndHidesTheHeader() {
        RestClient client = RestClient.builder()
                .requestFactory(new JdkClientHttpRequestFactory())
                .baseUrl("http://localhost:" + port)
                .build();

        Boolean hasContentEncoding = client.get().uri("/api/persons")
                .header("Accept-Encoding", "gzip")
                .exchange((request, response) -> response.getHeaders().get("Content-Encoding") != null);

        assertThat(hasContentEncoding).isFalse();
    }

    @Test
    void theOldHttpUrlConnectionFactoryShowsTheRealHeader() {
        RestClient client = RestClient.builder()
                .requestFactory(new SimpleClientHttpRequestFactory())
                .baseUrl("http://localhost:" + port)
                .build();

        String contentEncoding = client.get().uri("/api/persons")
                .header("Accept-Encoding", "gzip")
                .exchange((request, response) -> response.getHeaders().getFirst("Content-Encoding"));

        assertThat(contentEncoding).isEqualTo("gzip");
    }
}