/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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 com.facebook.buck.util;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import com.facebook.buck.core.exceptions.HumanReadableException;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import org.junit.Test;

public class PkillProcessManagerTest {

  @Test
  public void processIsRunningIfPkill0Succeeds() throws IOException, InterruptedException {
    ProcessExecutorParams pkill0Params =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "-0", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkill0Params, new FakeProcess(0)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    assertTrue(processManager.isProcessRunning("processName"));
    assertTrue(processExecutor.isProcessLaunched(pkill0Params));
  }

  @Test
  public void processIsNotRunningIfPkill0Fails() throws IOException, InterruptedException {
    ProcessExecutorParams pkill0Params =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "-0", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkill0Params, new FakeProcess(1)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    assertFalse(processManager.isProcessRunning("processName"));
    assertTrue(processExecutor.isProcessLaunched(pkill0Params));
  }

  @Test(expected = HumanReadableException.class)
  public void isProcessRunningThrowsOnUnexpectedExitCode()
      throws IOException, InterruptedException {
    ProcessExecutorParams pkill0Params =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "-0", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkill0Params, new FakeProcess(49152)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    processManager.isProcessRunning("processName");
  }

  @Test
  public void killProcessLaunchesProcessWithSuccess() throws IOException, InterruptedException {
    ProcessExecutorParams pkillParams =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkillParams, new FakeProcess(0)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    processManager.killProcess("processName");
    assertTrue(processExecutor.isProcessLaunched(pkillParams));
  }

  @Test
  public void killProcessLaunchesProcessWithFailure() throws IOException, InterruptedException {
    ProcessExecutorParams pkillParams =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkillParams, new FakeProcess(1)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    processManager.killProcess("processName");
    assertTrue(processExecutor.isProcessLaunched(pkillParams));
  }

  @Test(expected = HumanReadableException.class)
  public void killProcessThrowsWithUnexpectedExitCode() throws IOException, InterruptedException {
    ProcessExecutorParams pkillParams =
        ProcessExecutorParams.builder()
            .setCommand(ImmutableList.of("pkill", "processName"))
            .build();
    FakeProcessExecutor processExecutor =
        new FakeProcessExecutor(ImmutableMap.of(pkillParams, new FakeProcess(64738)));
    PkillProcessManager processManager = new PkillProcessManager(processExecutor);
    processManager.killProcess("processName");
  }
}
