/*
 * Copyright 2019 ConsenSys AG.
 *
 * 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.pantheon.consensus.ibft.jsonrpc.methods;

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

import tech.pegasys.pantheon.consensus.ibft.IbftBlockInterface;
import tech.pegasys.pantheon.ethereum.core.Address;
import tech.pegasys.pantheon.ethereum.core.BlockHeader;
import tech.pegasys.pantheon.ethereum.jsonrpc.internal.JsonRpcRequest;
import tech.pegasys.pantheon.ethereum.jsonrpc.internal.parameters.BlockParameter;
import tech.pegasys.pantheon.ethereum.jsonrpc.internal.parameters.JsonRpcParameter;
import tech.pegasys.pantheon.ethereum.jsonrpc.internal.queries.BlockchainQueries;

import java.util.Collections;
import java.util.List;
import java.util.Optional;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class IbftGetValidatorsByBlockNumberTest {

  @Mock private BlockchainQueries blockchainQueries;
  @Mock private BlockHeader blockHeader;
  @Mock private IbftBlockInterface ibftBlockInterface;
  @Mock private JsonRpcRequest request;

  private final JsonRpcParameter parameters = new JsonRpcParameter();
  private IbftGetValidatorsByBlockNumber method;

  @Before
  public void setUp() {
    method = new IbftGetValidatorsByBlockNumber(blockchainQueries, ibftBlockInterface, parameters);
  }

  @Test
  public void blockParameterIsParameter0() {
    request = new JsonRpcRequest("?", "ignore", new String[] {"0x1245"});
    BlockParameter blockParameter = method.blockParameter(request);
    assertThat(blockParameter.getNumber().getAsLong()).isEqualTo(0x1245);
  }

  @Test
  public void nameShouldBeCorrect() {
    assertThat(method.getName()).isEqualTo("ibft_getValidatorsByBlockNumber");
  }

  @Test
  public void shouldReturnListOfValidatorsFromBlock() {
    when(blockchainQueries.getBlockHeaderByNumber(12)).thenReturn(Optional.of(blockHeader));
    final List<Address> addresses = Collections.singletonList(Address.ID);
    final List<String> expectedOutput = Collections.singletonList(Address.ID.toString());
    when(ibftBlockInterface.validatorsInBlock(blockHeader)).thenReturn(addresses);
    Object result = method.resultByBlockNumber(request, 12);
    assertThat(result).isEqualTo(expectedOutput);
  }
}
