/*
 * Copyright 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 */

package org.hyperledger.besu;

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

import org.hyperledger.besu.cli.config.EthNetworkConfig;
import org.hyperledger.besu.cli.config.NetworkName;
import org.hyperledger.besu.config.GenesisConfigFile;
import org.hyperledger.besu.config.GenesisConfigOptions;
import org.hyperledger.besu.consensus.merge.MergeProtocolSchedule;
import org.hyperledger.besu.consensus.merge.PostMergeContext;
import org.hyperledger.besu.consensus.merge.TransitionProtocolSchedule;
import org.hyperledger.besu.consensus.merge.TransitionUtils;
import org.hyperledger.besu.ethereum.chain.Blockchain;
import org.hyperledger.besu.ethereum.chain.GenesisState;
import org.hyperledger.besu.ethereum.core.BlockHeader;
import org.hyperledger.besu.ethereum.core.MilestoneStreamingProtocolSchedule;
import org.hyperledger.besu.ethereum.forkid.ForkId;
import org.hyperledger.besu.ethereum.forkid.ForkIdManager;
import org.hyperledger.besu.ethereum.mainnet.DefaultProtocolSchedule;
import org.hyperledger.besu.ethereum.mainnet.MainnetProtocolSchedule;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import com.google.common.collect.Streams;
import org.apache.tuweni.bytes.Bytes;
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Enclosed.class)
public class ForkIdsNetworkConfigTest {

  public static class NotParameterized {
    @Test
    public void testFromRaw() {
      final ForkId forkId = new ForkId(Bytes.ofUnsignedInt(0xfe3366e7L), 1735371L);
      final List<List<Bytes>> forkIdAsBytesList = List.of(forkId.getForkIdAsBytesList());
      assertThat(ForkId.fromRawForkId(forkIdAsBytesList).get()).isEqualTo(forkId);
    }
  }

  @RunWith(Parameterized.class)
  public static class ParametrizedForkIdTest {

    @Parameterized.Parameter public NetworkName chainName;

    @Parameterized.Parameter(1)
    public List<ForkId> expectedForkIds;

    @Parameterized.Parameters(name = "{0}")
    public static Collection<Object[]> parameters() {
      return List.of(
          new Object[] {
            NetworkName.SEPOLIA,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0xfe3366e7L), 1735371L),
                new ForkId(Bytes.ofUnsignedInt(0xb96cbd13L), 1677557088L),
                new ForkId(Bytes.ofUnsignedInt(0xf7f9bc08L), 0L),
                new ForkId(Bytes.ofUnsignedInt(0xf7f9bc08L), 0L))
          },
          new Object[] {
            NetworkName.GOERLI,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0xa3f5ab08L), 1561651L),
                new ForkId(Bytes.ofUnsignedInt(0xc25efa5cL), 4460644L),
                new ForkId(Bytes.ofUnsignedInt(0x757a1c47L), 5062605L),
                new ForkId(Bytes.ofUnsignedInt(0xb8c6299dL), 1678832736L),
                new ForkId(Bytes.ofUnsignedInt(0xf9843abfL), 0L),
                new ForkId(Bytes.ofUnsignedInt(0xf9843abfL), 0L))
          },
          new Object[] {
            NetworkName.MAINNET,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0xfc64ec04L), 1150000L),
                new ForkId(Bytes.ofUnsignedInt(0x97c2c34cL), 1920000L),
                new ForkId(Bytes.ofUnsignedInt(0x91d1f948L), 2463000L),
                new ForkId(Bytes.ofUnsignedInt(0x91d1f948L), 2463000L),
                new ForkId(Bytes.ofUnsignedInt(0x91d1f948L), 2463000L),
                new ForkId(Bytes.ofUnsignedInt(0x7a64da13L), 2675000L),
                new ForkId(Bytes.ofUnsignedInt(0x3edd5b10L), 4370000L),
                new ForkId(Bytes.ofUnsignedInt(0xa00bc324L), 7280000L),
                new ForkId(Bytes.ofUnsignedInt(0x668db0afL), 9069000L),
                new ForkId(Bytes.ofUnsignedInt(0x879d6e30L), 9200000L),
                new ForkId(Bytes.ofUnsignedInt(0xe029e991L), 12244000L),
                new ForkId(Bytes.ofUnsignedInt(0xeb440f6L), 12965000L),
                new ForkId(Bytes.ofUnsignedInt(0xb715077dL), 13773000L),
                new ForkId(Bytes.ofUnsignedInt(0x20c327fcL), 15050000L),
                new ForkId(Bytes.ofUnsignedInt(0xf0afd0e3L), 1681338455L),
                new ForkId(Bytes.ofUnsignedInt(0xdce96c2dL), 0L),
                new ForkId(Bytes.ofUnsignedInt(0xdce96c2dL), 0L))
          },
          new Object[] {
            NetworkName.MORDOR,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0x175782aaL), 301243L),
                new ForkId(Bytes.ofUnsignedInt(0x604f6ee1L), 999983L),
                new ForkId(Bytes.ofUnsignedInt(0xf42f5539L), 2520000L),
                new ForkId(Bytes.ofUnsignedInt(0x66b5c286L), 3985893),
                new ForkId(Bytes.ofUnsignedInt(0x92b323e0L), 5520000L),
                new ForkId(Bytes.ofUnsignedInt(0x8c9b1797L), 0L),
                new ForkId(Bytes.ofUnsignedInt(0x8c9b1797L), 0L))
          },
          new Object[] {
            NetworkName.KOTTI,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0x550152eL), 716617L),
                new ForkId(Bytes.ofUnsignedInt(0xa3270822L), 1705549L),
                new ForkId(Bytes.ofUnsignedInt(0x8f3698e0L), 2200013L),
                new ForkId(Bytes.ofUnsignedInt(0x6f402821L), 4368634),
                new ForkId(Bytes.ofUnsignedInt(0xf03e54e7L), 5578000L),
                new ForkId(Bytes.ofUnsignedInt(0xc5459816L), 0L),
                new ForkId(Bytes.ofUnsignedInt(0xc5459816L), 0L))
          },
          new Object[] {
            NetworkName.CLASSIC,
            List.of(
                new ForkId(Bytes.ofUnsignedInt(0xfc64ec04L), 1150000L),
                new ForkId(Bytes.ofUnsignedInt(0x97c2c34cL), 2500000L),
                new ForkId(Bytes.ofUnsignedInt(0x97c2c34cL), 2500000L),
                new ForkId(Bytes.ofUnsignedInt(0x97c2c34cL), 2500000L),
                new ForkId(Bytes.ofUnsignedInt(0xdb06803fL), 3000000L),
                new ForkId(Bytes.ofUnsignedInt(0xaff4bed4L), 5000000L),
                new ForkId(Bytes.ofUnsignedInt(0xf79a63c0L), 5900000L),
                new ForkId(Bytes.ofUnsignedInt(0x744899d6L), 8772000L),
                new ForkId(Bytes.ofUnsignedInt(0x518b59c6L), 9573000L),
                new ForkId(Bytes.ofUnsignedInt(0x7ba22882L), 10500839L),
                new ForkId(Bytes.ofUnsignedInt(0x9007bfccL), 11700000L),
                new ForkId(Bytes.ofUnsignedInt(0xdb63a1caL), 13189133),
                new ForkId(Bytes.ofUnsignedInt(0x0f6bf187L), 14525000L),
                new ForkId(Bytes.ofUnsignedInt(0x7fd1bb25L), 0L),
                new ForkId(Bytes.ofUnsignedInt(0x7fd1bb25L), 0L))
          });
    }

    @Test
    public void testForkId() {
      final GenesisConfigFile genesisConfigFile =
          GenesisConfigFile.fromConfig(EthNetworkConfig.jsonConfig(chainName));
      final MilestoneStreamingTransitionProtocolSchedule schedule =
          createSchedule(genesisConfigFile);
      final GenesisState genesisState = GenesisState.fromConfig(genesisConfigFile, schedule);
      final Blockchain mockBlockchain = mock(Blockchain.class);
      final BlockHeader mockBlockHeader = mock(BlockHeader.class);

      when(mockBlockchain.getGenesisBlock()).thenReturn(genesisState.getBlock());

      final AtomicLong blockNumber = new AtomicLong();
      when(mockBlockchain.getChainHeadHeader()).thenReturn(mockBlockHeader);
      when(mockBlockHeader.getNumber()).thenAnswer(o -> blockNumber.get());
      when(mockBlockHeader.getTimestamp()).thenAnswer(o -> blockNumber.get());

      final ForkIdManager forkIdManager =
          new ForkIdManager(
              mockBlockchain,
              genesisConfigFile.getForkBlockNumbers(),
              genesisConfigFile.getForkTimestamps(),
              false);

      final List<ForkId> actualForkIds =
          Streams.concat(schedule.streamMilestoneBlocks(), Stream.of(Long.MAX_VALUE))
              .map(
                  block -> {
                    blockNumber.set(block);
                    return forkIdManager.getForkIdForChainHead();
                  })
              .collect(Collectors.toList());

      assertThat(actualForkIds).containsExactlyElementsOf(expectedForkIds);
    }

    private static MilestoneStreamingTransitionProtocolSchedule createSchedule(
        final GenesisConfigFile genesisConfigFile) {
      final GenesisConfigOptions configOptions = genesisConfigFile.getConfigOptions();
      MilestoneStreamingProtocolSchedule preMergeProtocolSchedule =
          new MilestoneStreamingProtocolSchedule(
              (DefaultProtocolSchedule) MainnetProtocolSchedule.fromConfig(configOptions));
      MilestoneStreamingProtocolSchedule postMergeProtocolSchedule =
          new MilestoneStreamingProtocolSchedule(
              (DefaultProtocolSchedule) MergeProtocolSchedule.create(configOptions, false));
      final MilestoneStreamingTransitionProtocolSchedule schedule =
          new MilestoneStreamingTransitionProtocolSchedule(
              preMergeProtocolSchedule, postMergeProtocolSchedule);
      return schedule;
    }

    public static class MilestoneStreamingTransitionProtocolSchedule
        extends TransitionProtocolSchedule {

      private final TransitionUtils<MilestoneStreamingProtocolSchedule> transitionUtils;

      public MilestoneStreamingTransitionProtocolSchedule(
          final MilestoneStreamingProtocolSchedule preMergeProtocolSchedule,
          final MilestoneStreamingProtocolSchedule postMergeProtocolSchedule) {
        super(preMergeProtocolSchedule, postMergeProtocolSchedule, PostMergeContext.get());
        transitionUtils =
            new TransitionUtils<>(
                preMergeProtocolSchedule, postMergeProtocolSchedule, PostMergeContext.get());
      }

      public Stream<Long> streamMilestoneBlocks() {
        return transitionUtils.dispatchFunctionAccordingToMergeState(
            MilestoneStreamingProtocolSchedule::streamMilestoneBlocks);
      }
    }
  }
}
