// Copyright 2015 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.runtime;

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

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.testutil.TestConstants;
import com.google.devtools.build.lib.util.ExitCode;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionsBase;
import com.google.devtools.common.options.OptionsParser;
import com.google.devtools.common.options.OptionsProvider;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
 * Tests {@link BlazeCommand}.
 */
@RunWith(JUnit4.class)
public class AbstractCommandTest {

  public static class FooOptions extends OptionsBase {
    @Option(name = "foo", category = "one", defaultValue = "0")
    public int foo;
  }

  public static class BarOptions extends OptionsBase {
    @Option(name = "bar", category = "two", defaultValue = "42")
    public int foo;

    @Option(name = "baz", category = "one", defaultValue = "oops")
    public String baz;
  }

  private static class ConcreteCommand implements BlazeCommand {
    @Override
    public ExitCode exec(CommandEnvironment env, OptionsProvider options) {
      throw new UnsupportedOperationException();
    }

    @Override
    public void editOptions(CommandEnvironment env, OptionsParser optionsParser) {}
  }

  @Command(name = "test_name",
          help = "Usage: some funny usage for %{command} ...;\n\n%{options}; end",
          options = {FooOptions.class, BarOptions.class},
          shortDescription = "a short description",
          allowResidue = false)
  private static class TestCommand extends ConcreteCommand {}

  @Test
  public void testGetNameYieldsAnnotatedName() {
    assertEquals("test_name",
        new TestCommand().getClass().getAnnotation(Command.class).name());
  }

  @Test
  public void testGetOptionsYieldsAnnotatedOptions() {
    ConfiguredRuleClassProvider ruleClassProvider = new ConfiguredRuleClassProvider.Builder()
        .setToolsRepository(TestConstants.TOOLS_REPOSITORY)
        .build();

    assertThat(
            BlazeCommandUtils.getOptions(
                TestCommand.class, ImmutableList.<BlazeModule>of(), ruleClassProvider))
        .containsExactlyElementsIn(optionClassesWithDefault(FooOptions.class, BarOptions.class));
  }

  /***************************************************************************
   * The tests below test how a command interacts with the dispatcher except *
   * for execution, which is tested in {@link BlazeCommandDispatcherTest}.   *
   ***************************************************************************/

  @Command(name = "a", options = {FooOptions.class}, shortDescription = "", help = "")
  private static class CommandA extends ConcreteCommand {}

  @Command(name = "b", options = {BarOptions.class}, inherits = {CommandA.class},
           shortDescription = "", help = "")
  private static class CommandB extends ConcreteCommand {}

  @Test
  public void testOptionsAreInherited() {
    ConfiguredRuleClassProvider ruleClassProvider = new ConfiguredRuleClassProvider.Builder()
        .setToolsRepository(TestConstants.TOOLS_REPOSITORY)
        .build();
    assertThat(
            BlazeCommandUtils.getOptions(
                CommandA.class, ImmutableList.<BlazeModule>of(), ruleClassProvider))
        .containsExactlyElementsIn(optionClassesWithDefault(FooOptions.class));
    assertThat(
            BlazeCommandUtils.getOptions(
                CommandB.class, ImmutableList.<BlazeModule>of(), ruleClassProvider))
        .containsExactlyElementsIn(optionClassesWithDefault(FooOptions.class, BarOptions.class));
  }

  private Collection<Class<?>> optionClassesWithDefault(Class<?>... optionClasses) {
    List<Class<?>> result = new ArrayList<>();
    Collections.addAll(result, optionClasses);
    result.add(BlazeCommandEventHandler.Options.class);
    result.add(CommonCommandOptions.class);
    return result;
  }
}