/*
 * 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.evm.operation;

import static org.assertj.core.api.Assertions.assertThat;

import org.hyperledger.besu.evm.MainnetEVMs;
import org.hyperledger.besu.evm.frame.MessageFrame;
import org.hyperledger.besu.evm.frame.MessageFrame.State;
import org.hyperledger.besu.evm.internal.EvmConfiguration;
import org.hyperledger.besu.evm.testutils.TestCodeExecutor;

import org.apache.tuweni.units.bigints.UInt256;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

public class LondonSStoreOperationGasCostTest {

  public static Object[][] scenarios() {
    // Tests specified in EIP-3539.
    return new Object[][] {
      {"0x60006000556000600055", 0, 212, 0},
      {"0x60006000556001600055", 0, 20112, 0},
      {"0x60016000556000600055", 0, 20112, 19900},
      {"0x60016000556002600055", 0, 20112, 0},
      {"0x60016000556001600055", 0, 20112, 0},
      {"0x60006000556000600055", 1, 3012, 4800},
      {"0x60006000556001600055", 1, 3012, 2800},
      {"0x60006000556002600055", 1, 3012, 0},
      {"0x60026000556000600055", 1, 3012, 4800},
      {"0x60026000556003600055", 1, 3012, 0},
      {"0x60026000556001600055", 1, 3012, 2800},
      {"0x60026000556002600055", 1, 3012, 0},
      {"0x60016000556000600055", 1, 3012, 4800},
      {"0x60016000556002600055", 1, 3012, 0},
      {"0x60016000556001600055", 1, 212, 0},
      {"0x600160005560006000556001600055", 0, 40118, 19900},
      {"0x600060005560016000556000600055", 1, 5918, 7600},
    };
  }

  private TestCodeExecutor codeExecutor;

  @BeforeEach
  public void setUp() {
    codeExecutor = new TestCodeExecutor(MainnetEVMs.london(EvmConfiguration.DEFAULT));
  }

  @ParameterizedTest
  @MethodSource("scenarios")
  void shouldCalculateGasAccordingToEip3529(
      final String code,
      final int originalValue,
      final int expectedGasUsed,
      final int expectedGasRefund) {
    final long gasLimit = 1_000_000;
    final MessageFrame frame =
        codeExecutor.executeCode(
            code,
            gasLimit,
            account -> account.setStorageValue(UInt256.ZERO, UInt256.valueOf(originalValue)));
    assertThat(frame.getState()).isEqualTo(State.COMPLETED_SUCCESS);
    assertThat(frame.getRemainingGas()).isEqualTo(gasLimit - (expectedGasUsed + 2100));
    assertThat(frame.getGasRefund()).isEqualTo(expectedGasRefund);
  }

  @Test
  void dryRunDetector() {
    assertThat(true)
        .withFailMessage("This test is here so gradle --dry-run executes this class")
        .isTrue();
  }
}
