/*
 * SonarQube
 * Copyright (C) 2009-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.application.process;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.rules.TemporaryFolder;
import org.sonar.process.AllProcessesCommands;
import org.sonar.process.ProcessId;

import static org.assertj.core.api.Java6Assertions.assertThat;
import static org.assertj.core.data.MapEntry.entry;
import static org.mockito.Mockito.RETURNS_MOCKS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class JavaProcessLauncherImplTest {

  @Rule
  public TemporaryFolder temp = new TemporaryFolder();
  @Rule
  public ExpectedException expectedException = ExpectedException.none();

  private AllProcessesCommands commands = mock(AllProcessesCommands.class, RETURNS_MOCKS);

  @Test
  public void launch_forks_a_new_process() throws Exception {
    File tempDir = temp.newFolder();
    TestProcessBuilder processBuilder = new TestProcessBuilder();
    JavaProcessLauncher underTest = new JavaProcessLauncherImpl(tempDir, commands, () -> processBuilder);
    JavaCommand command = new JavaCommand(ProcessId.ELASTICSEARCH);
    command.addClasspath("lib/*.class");
    command.addClasspath("lib/*.jar");
    command.setArgument("foo", "bar");
    command.setClassName("org.sonarqube.Main");
    command.setEnvVariable("VAR1", "valueOfVar1");
    command.setWorkDir(temp.newFolder());

    ProcessMonitor monitor = underTest.launch(command);

    assertThat(monitor).isNotNull();
    assertThat(processBuilder.started).isTrue();
    assertThat(processBuilder.commands.get(0)).endsWith("java");
    assertThat(processBuilder.commands).containsSequence(
      "-Djava.io.tmpdir=" + tempDir.getAbsolutePath(),
      "-cp",
      "lib/*.class" + System.getProperty("path.separator") + "lib/*.jar",
      "org.sonarqube.Main");
    assertThat(processBuilder.dir).isEqualTo(command.getWorkDir());
    assertThat(processBuilder.redirectErrorStream).isTrue();
    assertThat(processBuilder.environment)
      .contains(entry("VAR1", "valueOfVar1"))
      .containsAllEntriesOf(command.getEnvVariables());
  }

  @Test
  public void properties_are_passed_to_command_via_a_temporary_properties_file() throws Exception {
    File tempDir = temp.newFolder();
    TestProcessBuilder processBuilder = new TestProcessBuilder();
    JavaProcessLauncher underTest = new JavaProcessLauncherImpl(tempDir, commands, () -> processBuilder);
    JavaCommand command = new JavaCommand(ProcessId.ELASTICSEARCH);
    command.setArgument("foo", "bar");
    command.setArgument("baz", "woo");

    underTest.launch(command);

    String propsFilePath = processBuilder.commands.get(processBuilder.commands.size() - 1);
    File file = new File(propsFilePath);
    assertThat(file).exists().isFile();
    try (FileReader reader = new FileReader(file)) {
      Properties props = new Properties();
      props.load(reader);
      assertThat(props).containsOnly(
        entry("foo", "bar"),
        entry("baz", "woo"),
        entry("process.terminationTimeout", "60000"),
        entry("process.key", ProcessId.ELASTICSEARCH.getKey()),
        entry("process.index", String.valueOf(ProcessId.ELASTICSEARCH.getIpcIndex())),
        entry("process.sharedDir", tempDir.getAbsolutePath()));
    }
  }

  @Test
  public void throw_ISE_if_command_fails() throws IOException {
    File tempDir = temp.newFolder();
    JavaProcessLauncher.SystemProcessBuilder processBuilder = mock(JavaProcessLauncher.SystemProcessBuilder.class, RETURNS_MOCKS);
    when(processBuilder.start()).thenThrow(new IOException("error"));
    JavaProcessLauncher underTest = new JavaProcessLauncherImpl(tempDir, commands, () -> processBuilder);

    expectedException.expect(IllegalStateException.class);
    expectedException.expectMessage("Fail to launch process [es]");

    underTest.launch(new JavaCommand(ProcessId.ELASTICSEARCH));
  }

  private static class TestProcessBuilder extends JavaProcessLauncher.SystemProcessBuilder {
    private List<String> commands = null;
    private File dir = null;
    private Boolean redirectErrorStream = null;
    private final Map<String, String> environment = new HashMap<>();
    private boolean started = false;

    @Override
    public List<String> command() {
      return commands;
    }

    @Override
    public TestProcessBuilder command(List<String> commands) {
      this.commands = commands;
      return this;
    }

    @Override
    public TestProcessBuilder directory(File dir) {
      this.dir = dir;
      return this;
    }

    @Override
    public Map<String, String> environment() {
      return environment;
    }

    @Override
    public TestProcessBuilder redirectErrorStream(boolean b) {
      this.redirectErrorStream = b;
      return this;
    }

    @Override
    public Process start() throws IOException {
      this.started = true;
      return mock(Process.class);
    }
  }
}