// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.util;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableList;
import java.util.Arrays;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for the {@link CommandBuilder} class.
 */
@RunWith(JUnit4.class)
public class CommandBuilderTest {

  private CommandBuilder linuxBuilder() {
    return new CommandBuilder(OS.LINUX).useTempDir();
  }

  private CommandBuilder winBuilder() {
    return new CommandBuilder(OS.WINDOWS).useTempDir();
  }

  private void assertArgv(CommandBuilder builder, String... expected) {
    assertThat(builder.build().getCommandLineElements())
        .asList()
        .containsExactlyElementsIn(Arrays.asList(expected))
        .inOrder();
  }

  private void assertWinCmdArgv(CommandBuilder builder, String expected) {
    assertArgv(builder, "CMD.EXE", "/S", "/E:ON", "/V:ON", "/D", "/C", expected);
  }

  private void assertFailure(CommandBuilder builder, String expected) {
    Exception e = assertThrows(Exception.class, () -> builder.build());
    assertThat(e).hasMessageThat().isEqualTo(expected);
  }

  @Test
  public void linuxBuilderTest() {
    assertArgv(linuxBuilder().addArg("abc"), "abc");
    assertArgv(linuxBuilder().addArg("abc def"), "abc def");
    assertArgv(linuxBuilder().addArgs("abc", "def"), "abc", "def");
    assertArgv(linuxBuilder().addArgs(ImmutableList.of("abc", "def")), "abc", "def");
    assertArgv(linuxBuilder().addArg("abc").useShell(true), "/bin/sh", "-c", "abc");
    assertArgv(linuxBuilder().addArg("abc def").useShell(true), "/bin/sh", "-c", "abc def");
    assertArgv(linuxBuilder().addArgs("abc", "def").useShell(true), "/bin/sh", "-c", "abc def");
    assertArgv(linuxBuilder().addArgs("/bin/sh", "-c", "abc").useShell(true),
        "/bin/sh", "-c", "abc");
    assertArgv(linuxBuilder().addArgs("/bin/sh", "-c"), "/bin/sh", "-c");
    assertArgv(linuxBuilder().addArgs("/bin/bash", "-c"), "/bin/bash", "-c");
    assertArgv(linuxBuilder().addArgs("/bin/sh", "-c").useShell(true), "/bin/sh", "-c");
    assertArgv(linuxBuilder().addArgs("/bin/bash", "-c").useShell(true), "/bin/bash", "-c");
  }

  @Test
  public void windowsBuilderTest() {
    assertArgv(winBuilder().addArg("abc.exe"), "abc.exe");
    assertArgv(winBuilder().addArg("abc.exe -o"), "abc.exe -o");
    assertArgv(winBuilder().addArg("ABC.EXE"), "ABC.EXE");
    assertWinCmdArgv(winBuilder().addArg("abc def.exe"), "abc def.exe");
    assertArgv(winBuilder().addArgs("abc.exe", "def"), "abc.exe", "def");
    assertArgv(winBuilder().addArgs(ImmutableList.of("abc.exe", "def")), "abc.exe", "def");
    assertWinCmdArgv(winBuilder().addArgs("abc.exe", "def").useShell(true), "abc.exe def");
    assertWinCmdArgv(winBuilder().addArg("abc"), "abc");
    assertWinCmdArgv(winBuilder().addArgs("abc", "def"), "abc def");
    assertWinCmdArgv(winBuilder().addArgs("/bin/sh", "-c", "abc", "def"), "abc def");
    assertWinCmdArgv(winBuilder().addArgs("/bin/sh", "-c"), "");
    assertWinCmdArgv(winBuilder().addArgs("/bin/bash", "-c"), "");
    assertWinCmdArgv(winBuilder().addArgs("/bin/sh", "-c").useShell(true), "");
    assertWinCmdArgv(winBuilder().addArgs("/bin/bash", "-c").useShell(true), "");
  }

  @Test
  public void failureScenarios() {
    assertFailure(linuxBuilder(), "At least one argument is expected");
    assertFailure(new CommandBuilder(OS.UNKNOWN).useTempDir().addArg("a"),
        "Unidentified operating system");
    assertFailure(new CommandBuilder(OS.LINUX).addArg("a"),
        "Working directory must be set");
  }

}