package sonia.scm.boot;

import com.github.legman.Subscribe;
import com.google.common.base.Charsets;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
import sonia.scm.Stage;
import sonia.scm.event.ScmEventBus;
import sonia.scm.event.ScmTestEventBus;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@RunWith(MockitoJUnitRunner.class)
public class RestartServletTest {

  @Mock
  private HttpServletRequest request;

  @Mock
  private HttpServletResponse response;

  private RestartServlet restartServlet;

  private EventListener listener;

  private void setUpObjectUnderTest(Stage stage) {
    listener = new EventListener();
    ScmEventBus eventBus = ScmTestEventBus.getInstance();
    eventBus.register(listener);

    restartServlet = new RestartServlet(eventBus, stage);
  }

  @Test
  public void testRestart() throws IOException {
    setUpObjectUnderTest(Stage.DEVELOPMENT);
    setRequestInputReason("something changed");

    restartServlet.doPost(request, response);

    verify(response).setStatus(HttpServletResponse.SC_ACCEPTED);

    RestartEvent restartEvent = listener.restartEvent;
    assertThat(restartEvent).isNotNull();
    assertThat(restartEvent.getCause()).isEqualTo(RestartServlet.class);
    assertThat(restartEvent.getReason()).isEqualTo("something changed");
  }

  @Test
  public void testRestartCalledTwice() throws IOException {
    setUpObjectUnderTest(Stage.DEVELOPMENT);

    setRequestInputReason("initial change");
    restartServlet.doPost(request, response);
    verify(response).setStatus(HttpServletResponse.SC_ACCEPTED);

    setRequestInputReason("changed again");
    restartServlet.doPost(request, response);
    verify(response).setStatus(HttpServletResponse.SC_CONFLICT);
  }

  @Test
  public void testRestartWithInvalidContent() throws IOException {
    setUpObjectUnderTest(Stage.DEVELOPMENT);

    setRequestInputContent("invalid json");

    restartServlet.doPost(request, response);

    verify(response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
  }

  @Test
  public void testRestartInProductionStage() throws IOException {
    setUpObjectUnderTest(Stage.PRODUCTION);

    setRequestInputReason("initial change");

    restartServlet.doPost(request, response);

    verify(response).setStatus(HttpServletResponse.SC_NOT_ACCEPTABLE);
  }

  private void setRequestInputReason(String message) throws IOException {
    String content = createReason(message);
    setRequestInputContent(content);
  }

  private void setRequestInputContent(String content) throws IOException {
    InputStream input = createReasonAsInputStream(content);
    when(request.getInputStream()).thenReturn(createServletInputStream(input));
  }

  private ServletInputStream createServletInputStream(final InputStream inputStream) {
    return new ServletInputStream() {
      @Override
      public int read() throws IOException {
        return inputStream.read();
      }
    };
  }

  private InputStream createReasonAsInputStream(String content) {
    return new ByteArrayInputStream(content.getBytes(Charsets.UTF_8));
  }

  private String createReason(String message) {
    return String.format("{\"message\": \"%s\"}", message);
  }

  public static class EventListener {

    private RestartEvent restartEvent;

    @Subscribe(async = false)
    public void store(RestartEvent restartEvent) {
      this.restartEvent = restartEvent;
    }

  }
}