<dependency>
  <groupId>org.wiremock</groupId>
  <artifactId>wiremock</artifactId>
  <version>3.4.1</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.assertj</groupId>
  <artifactId>assertj-core</artifactId>
  <scope>test</scope>
</dependency>

dependencies {
  testImplementation("org.wiremock:wiremock:3.4.1")
  testImplementation("org.junit.jupiter:junit-jupiter")
  testImplementation("org.assertj:assertj-core")
}

import com.github.tomakehurst.wiremock.junit5.WireMockExtension;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;
import static com.github.tomakehurst.wiremock.client.WireMock.*;
import static org.assertj.core.api.Assertions.assertThat;

class ExternalWeatherServiceTest {

  @RegisterExtension
  static WireMockExtension wireMock = WireMockExtension.newInstance()
    .options(wireMockConfig().dynamicPort())
    .build();

  @Test
  void shouldFetchWeatherDataFromExternalApi() {
    wireMock.stubFor(get(urlEqualTo("/weather?city=London"))
      .withHeader("Accept", containing("application/json"))
      .willReturn(aResponse()
        .withStatus(200)
        .withHeader("Content-Type", "application/json")
        .withBody("{\"city\":\"London\",\"temperature\":15,\"condition\":\"Cloudy\"}")));

    String baseUrl = wireMock.getRuntimeInfo().getHttpBaseUrl();
    WeatherApiClient client = new WeatherApiClient(baseUrl);
    WeatherData weather = client.getWeather("London");

    assertThat(weather.getCity()).isEqualTo("London");
    assertThat(weather.getTemperature()).isEqualTo(15);

    wireMock.verify(getRequestedFor(urlEqualTo("/weather?city=London"))
      .withHeader("Accept", containing("application/json")));
  }
}

@Test
void shouldHandleNotFoundError() {
  wireMock.stubFor(get(urlEqualTo("/api/users/999"))
    .willReturn(aResponse()
      .withStatus(404)
      .withBody("{\"error\":\"User not found\"}")));

  WeatherApiClient client = new WeatherApiClient(wireMock.getRuntimeInfo().getHttpBaseUrl());
  
  assertThatThrownBy(() -> client.getUser(999))
    .isInstanceOf(UserNotFoundException.class)
    .hasMessageContaining("User not found");
}

@Test
void shouldRetryOnServerError() {
  wireMock.stubFor(get(urlEqualTo("/api/data"))
    .willReturn(aResponse()
      .withStatus(500)
      .withBody("{\"error\":\"Internal server error\"}")));

  ApiClient client = new ApiClient(wireMock.getRuntimeInfo().getHttpBaseUrl());
  
  assertThatThrownBy(() -> client.fetchData())
    .isInstanceOf(ServerErrorException.class);
}

@Test
void shouldVerifyRequestBody() {
  wireMock.stubFor(post(urlEqualTo("/api/users"))
    .willReturn(aResponse()
      .withStatus(201)
      .withBody("{\"id\":123,\"name\":\"Alice\"}")));

  ApiClient client = new ApiClient(wireMock.getRuntimeInfo().getHttpBaseUrl());
  UserResponse response = client.createUser("Alice");

  assertThat(response.getId()).isEqualTo(123);
  
  wireMock.verify(postRequestedFor(urlEqualTo("/api/users"))
    .withRequestBody(matchingJsonPath("$.name", equalTo("Alice")))
    .withHeader("Content-Type", containing("application/json")));
}