// Copyright 2018 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.exec;

import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Mockito.when;

import com.google.common.collect.ImmutableList;
import com.google.common.eventbus.EventBus;
import com.google.devtools.build.lib.actions.ActionContext;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionExecutionMetadata;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnActionContext;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.analysis.test.TestActionContext;
import com.google.devtools.build.lib.analysis.test.TestResult;
import com.google.devtools.build.lib.analysis.test.TestRunnerAction;
import com.google.devtools.build.lib.events.Reporter;
import com.google.devtools.build.lib.testutil.Suite;
import com.google.devtools.build.lib.testutil.TestSpec;
import com.google.devtools.build.lib.util.RegexFilter.RegexFilterConverter;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.view.test.TestStatus.TestResultData;
import java.io.IOException;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mockito;

/** Tests of {@link SpawnActionContextMaps}. */
@RunWith(JUnit4.class)
@TestSpec(size = Suite.SMALL_TESTS)
public class SpawnActionContextMapsTest {

  private SpawnActionContextMaps.Builder builder;
  private final RegexFilterConverter converter = new RegexFilterConverter();
  private final EventBus bus = new EventBus();
  private final Reporter reporter = new Reporter(bus);

  private static final ImmutableList<ActionContextProvider> PROVIDERS =
      ImmutableList.of(
          new ActionContextProvider() {
            @Override
            public Iterable<? extends ActionContext> getActionContexts() {
              return ImmutableList.of(new AC1(), new AC2(), new ACTest());
            }
          });

  @Before
  public void setUp() {
    builder = new SpawnActionContextMaps.Builder();
  }

  @Test
  public void duplicateMnemonics_lastOneWins() throws Exception {
    builder.strategyByMnemonicMap().put("Spawn1", "ac1").put("Spawn1", "ac2");
    SpawnActionContextMaps maps = builder.build(PROVIDERS, "actest");
    SpawnActionContext result = maps.getSpawnActionContext(mockSpawn("Spawn1", null), reporter);
    assertThat(result).isInstanceOf(AC2.class);
  }

  @Test
  public void emptyStrategyFallsBackToEmptyMnemonicNotToDefault() throws Exception {
    builder.strategyByMnemonicMap().put("Spawn1", "").put("", "ac2");
    SpawnActionContextMaps maps = builder.build(PROVIDERS, "actest");
    SpawnActionContext result = maps.getSpawnActionContext(mockSpawn("Spawn1", null), reporter);
    assertThat(result).isInstanceOf(AC2.class);
  }

  @Test
  public void multipleRegexps_firstMatchWins() throws Exception {
    builder.addStrategyByRegexp(converter.convert("foo"), "ac1");
    builder.addStrategyByRegexp(converter.convert("foo/bar"), "ac2");
    SpawnActionContextMaps maps = builder.build(PROVIDERS, "actest");

    SpawnActionContext result =
        maps.getSpawnActionContext(mockSpawn(null, "Doing something with foo/bar/baz"), reporter);

    assertThat(result).isInstanceOf(AC1.class);
  }

  @Test
  public void regexpAndMnemonic_regexpWins() throws Exception {
    builder.strategyByMnemonicMap().put("Spawn1", "ac1");
    builder.addStrategyByRegexp(converter.convert("foo/bar"), "ac2");
    SpawnActionContextMaps maps = builder.build(PROVIDERS, "actest");

    SpawnActionContext result =
        maps.getSpawnActionContext(
            mockSpawn("Spawn1", "Doing something with foo/bar/baz"), reporter);

    assertThat(result).isInstanceOf(AC2.class);
  }

  @Test
  public void duplicateContext_noException() throws Exception {
    builder.strategyByContextMap().put(AC1.class, "one");
    builder.strategyByContextMap().put(AC1.class, "two");
    builder.strategyByContextMap().put(AC1.class, "");
  }

  private Spawn mockSpawn(String mnemonic, String message) {
    Spawn mockSpawn = Mockito.mock(Spawn.class);
    ActionExecutionMetadata mockOwner = Mockito.mock(ActionExecutionMetadata.class);
    when(mockOwner.getProgressMessage()).thenReturn(message);
    when(mockSpawn.getResourceOwner()).thenReturn(mockOwner);
    when(mockSpawn.getMnemonic()).thenReturn(mnemonic);
    return mockSpawn;
  }

  @ExecutionStrategy(contextType = SpawnActionContext.class, name = "ac1")
  private static class AC1 implements SpawnActionContext {
    @Override
    public List<SpawnResult> exec(Spawn spawn, ActionExecutionContext actionExecutionContext)
        throws ExecException, InterruptedException {
      throw new UnsupportedOperationException();
    }
  }

  @ExecutionStrategy(contextType = SpawnActionContext.class, name = "ac2")
  private static class AC2 implements SpawnActionContext {
    @Override
    public List<SpawnResult> exec(Spawn spawn, ActionExecutionContext actionExecutionContext)
        throws ExecException, InterruptedException {
      throw new UnsupportedOperationException();
    }
  }

  @ExecutionStrategy(contextType = TestActionContext.class, name = "actest")
  private static class ACTest implements TestActionContext {
    @Override
    public List<SpawnResult> exec(
        TestRunnerAction action, ActionExecutionContext actionExecutionContext)
        throws ExecException, InterruptedException {
      throw new UnsupportedOperationException();
    }

    @Override
    public TestResult newCachedTestResult(
        Path execRoot, TestRunnerAction action, TestResultData cached) throws IOException {
      throw new UnsupportedOperationException();
    }
  }
}