/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.beam.runners.dataflow.worker;

import static org.apache.beam.runners.dataflow.worker.util.common.worker.ExecutionStateTracker.ABORT_STATE_NAME;
import static org.apache.beam.runners.dataflow.worker.util.common.worker.ExecutionStateTracker.FINISH_STATE_NAME;
import static org.apache.beam.runners.dataflow.worker.util.common.worker.ExecutionStateTracker.PROCESS_STATE_NAME;
import static org.apache.beam.runners.dataflow.worker.util.common.worker.ExecutionStateTracker.START_STATE_NAME;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.sameInstance;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.google.api.services.dataflow.model.CounterUpdate;
import com.google.common.base.Joiner;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import javax.annotation.Nullable;
import org.apache.beam.runners.core.SimpleDoFnRunner;
import org.apache.beam.runners.dataflow.worker.BatchModeExecutionContext.BatchModeExecutionStateRegistry;
import org.apache.beam.runners.dataflow.worker.DataflowOperationContext.DataflowExecutionState;
import org.apache.beam.runners.dataflow.worker.counters.CounterFactory;
import org.apache.beam.runners.dataflow.worker.counters.NameContext;
import org.apache.beam.runners.dataflow.worker.logging.DataflowWorkerLoggingInitializer;
import org.apache.beam.runners.dataflow.worker.profiler.ScopedProfiler;
import org.apache.beam.runners.dataflow.worker.profiler.ScopedProfiler.ProfileScope;
import org.apache.beam.runners.dataflow.worker.util.common.worker.ExecutionStateTracker;
import org.apache.beam.sdk.metrics.MetricsContainer;
import org.apache.beam.sdk.testing.RestoreSystemProperties;
import org.hamcrest.Matchers;
import org.joda.time.Duration;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.rules.TemporaryFolder;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;

/** Tests for {@link DataflowOperationContext}. */
@RunWith(Enclosed.class)
public class DataflowOperationContextTest {

  /** Tests for the management of {@link ExecutionState} in {@link DataflowOperationContext}. */
  @RunWith(JUnit4.class)
  public static class ContextStatesTest {

    @Mock private CounterFactory counterFactory;
    @Mock private MetricsContainer metricsContainer;

    private ExecutionStateRegistry stateRegistry = new BatchModeExecutionStateRegistry();

    @Mock private ScopedProfiler scopedProfiler;

    @Mock private ProfileScope emptyScope;
    @Mock private ProfileScope profileScope;

    private DataflowExecutionState otherState;
    private DataflowExecutionState startState;
    private DataflowExecutionState processState;
    private DataflowExecutionState abortState;

    private ExecutionStateTracker stateTracker = ExecutionStateTracker.newForTest();
    private DataflowOperationContext operationContext;

    @Before
    public void setUp() {
      MockitoAnnotations.initMocks(this);

      otherState = stateRegistry.getState(NameContext.forStage("STAGE"), "other", null, emptyScope);
      startState =
          stateRegistry.getState(
              NameContextsForTests.nameContextForTest(),
              START_STATE_NAME,
              metricsContainer,
              profileScope);
      processState =
          stateRegistry.getState(
              NameContextsForTests.nameContextForTest(),
              PROCESS_STATE_NAME,
              metricsContainer,
              profileScope);
      abortState =
          stateRegistry.getState(
              NameContextsForTests.nameContextForTest(),
              ABORT_STATE_NAME,
              metricsContainer,
              profileScope);
      stateRegistry.getState(
          NameContextsForTests.nameContextForTest(),
          FINISH_STATE_NAME,
          metricsContainer,
          profileScope);

      operationContext =
          new DataflowOperationContext(
              counterFactory,
              NameContextsForTests.nameContextForTest(),
              metricsContainer,
              stateTracker,
              stateRegistry);

      // MapTaskExecutor ensures we start in the "other" (outside of a step) state.
      stateTracker.enterState(otherState);
      Mockito.reset(emptyScope); // reset so tests don't need to expect the activation above
    }

    @Test
    public void enterStart() {
      operationContext.enterStart();

      assertThat(stateTracker.getCurrentState(), sameInstance(startState));
      verify(profileScope).activate();
    }

    @Test
    public void exitStart() throws IOException {
      operationContext.enterStart().close();

      assertThat(stateTracker.getCurrentState(), sameInstance(otherState));
      verify(profileScope).activate();
      verify(emptyScope).activate();
    }

    @Test
    public void enterAllStates() {
      operationContext.enterStart();
      operationContext.enterProcess();
      operationContext.enterFinish();
      operationContext.enterAbort();

      assertThat(stateTracker.getCurrentState(), sameInstance(abortState));
      verify(profileScope, times(4)).activate(); // start, process, finish, abort
    }

    @Test
    public void enterAllStatesAndExit() throws IOException {
      operationContext.enterStart();
      operationContext.enterProcess();
      Closeable finish = operationContext.enterFinish();
      Closeable abort = operationContext.enterAbort();
      abort.close();
      finish.close();

      assertThat(stateTracker.getCurrentState(), sameInstance(processState));
      verify(profileScope, times(6)).activate(); // start, process, finish, abort, finish, process
    }
  }

  /** Tests for the lull logging in {@link DataflowOperationContext}. */
  @RunWith(JUnit4.class)
  public static class LullLoggingTest {

    @Rule public TemporaryFolder tempFolder = new TemporaryFolder();

    @Rule public RestoreSystemProperties restoreSystemProperties = new RestoreSystemProperties();

    private File logFolder;

    @Before
    public void setUp() throws IOException {
      logFolder = tempFolder.newFolder();
      System.setProperty(
          DataflowWorkerLoggingInitializer.RUNNER_FILEPATH_PROPERTY,
          new File(logFolder, "dataflow-json.log").getAbsolutePath());
      // We need to reset *first* because some other test may have already initialized the
      // logging initializer.
      DataflowWorkerLoggingInitializer.reset();
      DataflowWorkerLoggingInitializer.initialize();
    }

    @After
    public void tearDown() {
      DataflowWorkerLoggingInitializer.reset();
    }

    @Test
    public void testLullReportsRightTrace() throws Exception {
      Thread mockThread = mock(Thread.class);

      DataflowExecutionState executionState =
          new DataflowExecutionState(
              NameContextsForTests.nameContextForTest(),
              "somestate",
              null /* requestingStepName */,
              null /* inputIndex */,
              null /* metricsContainer */,
              ScopedProfiler.INSTANCE.emptyScope()) {
            @Nullable
            @Override
            public CounterUpdate extractUpdate(boolean isFinalUpdate) {
              // not being used for extracting updates
              return null;
            }

            @Override
            public void takeSample(long millisSinceLastSample) {
              // Not being used for sampling
            }
          };

      when(mockThread.getStackTrace())
          .thenReturn(
              new StackTraceElement[] {
                new StackTraceElement(
                    "userpackage.SomeUserDoFn", "helperMethod", "SomeUserDoFn.java", 250),
                new StackTraceElement(
                    "userpackage.SomeUserDoFn", "process", "SomeUserDoFn.java", 450),
                new StackTraceElement(
                    SimpleDoFnRunner.class.getName(),
                    "processElement",
                    "SimpleDoFnRunner.java",
                    500),
              });
      executionState.reportLull(mockThread, 6000);

      File[] files = logFolder.listFiles();
      assertThat(files, Matchers.arrayWithSize(1));
      String contents = Joiner.on("\n").join(Files.readAllLines(files[0].toPath()));
      assertThat(
          contents,
          Matchers.allOf(
              Matchers.containsString("Processing stuck in step " + NameContextsForTests.USER_NAME),
              Matchers.containsString(" without outputting or completing in state somestate"),
              Matchers.containsString("userpackage.SomeUserDoFn.helperMethod"),
              Matchers.not(Matchers.containsString(SimpleDoFnRunner.class.getName()))));
    }

    @Test
    public void testDurationFormatting() {
      assertThat(
          DataflowOperationContext.formatDuration(getDuration(0, 0, 5, 10, 500)),
          equalTo("05m10s"));
      assertThat(
          DataflowOperationContext.formatDuration(getDuration(0, 2, 10, 23, 500)),
          equalTo("02h10m23s"));
      assertThat(
          DataflowOperationContext.formatDuration(getDuration(1, 0, 0, 23, 500)),
          equalTo("24h00m23s"));
      assertThat(
          DataflowOperationContext.formatDuration(getDuration(1, 0, 10, 23, 500)),
          equalTo("24h10m23s"));
      assertThat(
          DataflowOperationContext.formatDuration(getDuration(2, 0, 0, 23, 500)),
          equalTo("48h00m23s"));
    }

    private Duration getDuration(int days, int hours, int minutes, int seconds, int millis) {
      return Duration.standardDays(days)
          .plus(Duration.standardHours(hours))
          .plus(Duration.standardMinutes(minutes))
          .plus(Duration.standardSeconds(seconds))
          .plus(Duration.millis(millis));
    }
  }
}
