/*
 * Copyright Consensys Software Inc., 2022
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

package tech.pegasys.teku.beaconrestapi.handlers.tekuv1.beacon;

import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.when;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_BAD_REQUEST;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_INTERNAL_SERVER_ERROR;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_NOT_FOUND;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_NO_CONTENT;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_OK;
import static tech.pegasys.teku.infrastructure.http.HttpStatusCodes.SC_SERVICE_UNAVAILABLE;
import static tech.pegasys.teku.infrastructure.http.RestApiConstants.PARAM_BLOCK_ID;
import static tech.pegasys.teku.infrastructure.restapi.MetadataTestUtil.getResponseSszFromMetadata;
import static tech.pegasys.teku.infrastructure.restapi.MetadataTestUtil.verifyMetadataEmptyResponse;
import static tech.pegasys.teku.infrastructure.restapi.MetadataTestUtil.verifyMetadataErrorResponse;

import com.fasterxml.jackson.core.JsonProcessingException;
import java.io.IOException;
import java.util.Optional;
import org.apache.tuweni.bytes.Bytes;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import tech.pegasys.teku.beaconrestapi.AbstractMigratedBeaconHandlerTest;
import tech.pegasys.teku.infrastructure.async.SafeFuture;
import tech.pegasys.teku.spec.datastructures.state.beaconstate.BeaconState;

public class GetStateByBlockRootTest extends AbstractMigratedBeaconHandlerTest {

  @BeforeEach
  void setup() {
    setHandler(new GetStateByBlockRoot(chainDataProvider, spec));
  }

  @Test
  public void shouldReturnStateByBlockId() throws JsonProcessingException {
    final BeaconState state = dataStructureUtil.randomBeaconState();
    request.setPathParameter(PARAM_BLOCK_ID, "head");
    when(chainDataProvider.getBeaconStateByBlockId(eq("head")))
        .thenReturn(SafeFuture.completedFuture(Optional.of(state)));

    handler.handleRequest(request);

    assertThat(request.getResponseCode()).isEqualTo(SC_OK);
    assertThat(request.getResponseBody()).isEqualTo(state);
  }

  @Test
  void metadata_shouldHandle400() throws JsonProcessingException {
    verifyMetadataErrorResponse(handler, SC_BAD_REQUEST);
  }

  @Test
  void metadata_shouldHandle404() throws JsonProcessingException {
    verifyMetadataErrorResponse(handler, SC_NOT_FOUND);
  }

  @Test
  void metadata_shouldHandle500() throws JsonProcessingException {
    verifyMetadataErrorResponse(handler, SC_INTERNAL_SERVER_ERROR);
  }

  @Test
  void metadata_shouldHandle200() throws IOException {
    final BeaconState data = dataStructureUtil.randomBeaconState();

    final byte[] response = getResponseSszFromMetadata(handler, SC_OK, data);
    final BeaconState expected = spec.deserializeBeaconState(Bytes.wrap(response));
    assertThat(data).isEqualTo(expected);
  }

  @Test
  void metadata_shouldHandle204() {
    verifyMetadataEmptyResponse(handler, SC_NO_CONTENT);
  }

  @Test
  void metadata_shouldHandle503() throws JsonProcessingException {
    verifyMetadataErrorResponse(handler, SC_SERVICE_UNAVAILABLE);
  }
}
