/*
 * 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.dolphinscheduler.plugin.task.emr;

import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_FAILURE;
import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_KILL;
import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_SUCCESS;
import static org.mockito.ArgumentMatchers.any;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.TaskCallBack;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;

import org.apache.commons.io.IOUtils;

import java.io.InputStream;
import java.nio.charset.StandardCharsets;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

import com.amazonaws.services.elasticmapreduce.AmazonElasticMapReduce;
import com.amazonaws.services.elasticmapreduce.model.AmazonElasticMapReduceException;
import com.amazonaws.services.elasticmapreduce.model.Cluster;
import com.amazonaws.services.elasticmapreduce.model.ClusterState;
import com.amazonaws.services.elasticmapreduce.model.ClusterStateChangeReason;
import com.amazonaws.services.elasticmapreduce.model.ClusterStateChangeReasonCode;
import com.amazonaws.services.elasticmapreduce.model.ClusterStatus;
import com.amazonaws.services.elasticmapreduce.model.DescribeClusterResult;
import com.amazonaws.services.elasticmapreduce.model.RunJobFlowResult;

@ExtendWith(MockitoExtension.class)
public class EmrJobFlowTaskTest {

    private final ClusterStatus startingStatus =
            new ClusterStatus().withState(ClusterState.STARTING)
                    .withStateChangeReason(new ClusterStateChangeReason());

    private final ClusterStatus softwareConfigStatus =
            new ClusterStatus().withState(ClusterState.STARTING)
                    .withStateChangeReason(
                            new ClusterStateChangeReason()
                                    .withMessage("Configuring cluster software"));

    private final ClusterStatus runningStatus =
            new ClusterStatus().withState(ClusterState.RUNNING)
                    .withStateChangeReason(
                            new ClusterStateChangeReason().withMessage("Running step"));

    private final ClusterStatus terminatingStatus =
            new ClusterStatus().withState(ClusterState.TERMINATING.toString())
                    .withStateChangeReason(
                            new ClusterStateChangeReason()
                                    .withCode(ClusterStateChangeReasonCode.ALL_STEPS_COMPLETED)
                                    .withMessage("Steps completed"));

    private final ClusterStatus waitingStatus =
            new ClusterStatus().withState(ClusterState.WAITING)
                    .withStateChangeReason(
                            new ClusterStateChangeReason()
                                    .withMessage("Cluster ready after last step completed."));

    private final ClusterStatus userRequestTerminateStatus =
            new ClusterStatus().withState(ClusterState.TERMINATING)
                    .withStateChangeReason(
                            new ClusterStateChangeReason()
                                    .withCode(ClusterStateChangeReasonCode.USER_REQUEST)
                                    .withMessage("Terminated by user request"));

    private final ClusterStatus terminatedWithErrorsStatus =
            new ClusterStatus().withState(ClusterState.TERMINATED_WITH_ERRORS)
                    .withStateChangeReason(
                            new ClusterStateChangeReason()
                                    .withCode(ClusterStateChangeReasonCode.STEP_FAILURE));

    private EmrJobFlowTask emrJobFlowTask;
    private AmazonElasticMapReduce emrClient;
    private Cluster cluster;
    private TaskCallBack taskCallBack = (taskInstanceId, appIds) -> {

    };

    @BeforeEach
    public void before() throws Exception {
        String emrParameters = buildEmrTaskParameters();
        TaskExecutionContext taskExecutionContext = Mockito.mock(TaskExecutionContext.class);
        Mockito.when(taskExecutionContext.getTaskParams()).thenReturn(emrParameters);
        emrJobFlowTask = Mockito.spy(new EmrJobFlowTask(taskExecutionContext));

        // mock emrClient and behavior
        emrClient = Mockito.mock(AmazonElasticMapReduce.class);
        RunJobFlowResult runJobFlowResult = Mockito.mock(RunJobFlowResult.class);
        Mockito.lenient().when(emrClient.runJobFlow(any())).thenReturn(runJobFlowResult);
        Mockito.lenient().when(runJobFlowResult.getJobFlowId()).thenReturn("xx");
        Mockito.doReturn(emrClient).when(emrJobFlowTask).createEmrClient();
        DescribeClusterResult describeClusterResult = Mockito.mock(DescribeClusterResult.class);
        Mockito.lenient().when(emrClient.describeCluster(any())).thenReturn(describeClusterResult);

        // mock cluster
        cluster = Mockito.mock(Cluster.class);
        Mockito.lenient().when(describeClusterResult.getCluster()).thenReturn(cluster);

        emrJobFlowTask.init();
    }

    @Test
    public void testHandle() throws Exception {

        Mockito.when(cluster.getStatus()).thenReturn(startingStatus, softwareConfigStatus, runningStatus,
                terminatingStatus);

        emrJobFlowTask.handle(taskCallBack);
        Assertions.assertEquals(EXIT_CODE_SUCCESS, emrJobFlowTask.getExitStatusCode());

    }

    @Test
    public void testHandleAliveWhenNoSteps() throws Exception {
        Mockito.when(cluster.getStatus()).thenReturn(startingStatus, softwareConfigStatus, runningStatus,
                waitingStatus);

        emrJobFlowTask.handle(taskCallBack);
        Assertions.assertEquals(EXIT_CODE_SUCCESS, emrJobFlowTask.getExitStatusCode());
    }

    @Test
    public void testHandleUserRequestTerminate() throws Exception {
        Mockito.when(cluster.getStatus()).thenReturn(startingStatus, userRequestTerminateStatus);

        emrJobFlowTask.handle(taskCallBack);
        Assertions.assertEquals(EXIT_CODE_KILL, emrJobFlowTask.getExitStatusCode());
    }

    @Test
    public void testHandleTerminatedWithError() throws Exception {
        Mockito.when(cluster.getStatus()).thenReturn(startingStatus, softwareConfigStatus, runningStatus,
                terminatedWithErrorsStatus);

        emrJobFlowTask.handle(taskCallBack);
        Assertions.assertEquals(EXIT_CODE_FAILURE, emrJobFlowTask.getExitStatusCode());
    }

    @Test
    public void testCanNotParseJson() throws Exception {
        Mockito.when(emrJobFlowTask.createRunJobFlowRequest())
                .thenThrow(new EmrTaskException("can not parse RunJobFlowRequest from json", new Exception("error")));
        Assertions.assertThrows(TaskException.class, () -> {
            emrJobFlowTask.handle(taskCallBack);
        });
    }

    @Test
    public void testClusterStatusNull() throws Exception {
        Mockito.when(emrClient.describeCluster(any())).thenReturn(null);
        Assertions.assertThrows(TaskException.class, () -> {
            emrJobFlowTask.handle(taskCallBack);
        });
    }

    @Test
    public void testRunJobFlowError() throws Exception {
        Mockito.when(emrClient.runJobFlow(any())).thenThrow(new AmazonElasticMapReduceException("error"),
                new EmrTaskException());
        Assertions.assertThrows(TaskException.class, () -> {
            emrJobFlowTask.handle(taskCallBack);
        });
    }

    private String buildEmrTaskParameters() {
        EmrParameters emrParameters = new EmrParameters();
        String jobFlowDefineJson;
        try (InputStream i = this.getClass().getResourceAsStream("EmrJobFlowDefine.json")) {
            assert i != null;
            jobFlowDefineJson = IOUtils.toString(i, StandardCharsets.UTF_8);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        emrParameters.setProgramType(ProgramType.RUN_JOB_FLOW);
        emrParameters.setJobFlowDefineJson(jobFlowDefineJson);

        return JSONUtils.toJsonString(emrParameters);
    }
}
