/*
 * 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.flink.runtime.webmonitor.handlers;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import org.apache.flink.runtime.execution.ExecutionState;
import org.apache.flink.runtime.executiongraph.AccessExecutionGraph;
import org.apache.flink.runtime.executiongraph.AccessExecutionJobVertex;
import org.apache.flink.runtime.executiongraph.AccessExecutionVertex;
import org.apache.flink.runtime.taskmanager.TaskManagerLocation;
import org.apache.flink.runtime.webmonitor.history.ArchivedJson;
import org.apache.flink.runtime.webmonitor.history.JsonArchivist;
import org.apache.flink.runtime.webmonitor.utils.ArchivedJobGenerationUtils;
import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;
import java.util.Collection;

public class JobVertexDetailsHandlerTest {

	@Test
	public void testArchiver() throws Exception {
		JsonArchivist archivist = new JobVertexDetailsHandler.JobVertexDetailsJsonArchivist();
		AccessExecutionGraph originalJob = ArchivedJobGenerationUtils.getTestJob();
		AccessExecutionJobVertex originalTask = ArchivedJobGenerationUtils.getTestTask();

		Collection<ArchivedJson> archives = archivist.archiveJsonWithPath(originalJob);
		Assert.assertEquals(1, archives.size());

		ArchivedJson archive = archives.iterator().next();
		Assert.assertEquals("/jobs/" + originalJob.getJobID() + "/vertices/" + originalTask.getJobVertexId(), archive.getPath());
		compareVertexDetails(originalTask, archive.getJson());
	}

	@Test
	public void testGetPaths() {
		JobVertexDetailsHandler handler = new JobVertexDetailsHandler(null, null);
		String[] paths = handler.getPaths();
		Assert.assertEquals(1, paths.length);
		Assert.assertEquals("/jobs/:jobid/vertices/:vertexid", paths[0]);
	}

	@Test
	public void testJsonGeneration() throws Exception {
		AccessExecutionJobVertex originalTask = ArchivedJobGenerationUtils.getTestTask();
		String json = JobVertexDetailsHandler.createVertexDetailsJson(
			originalTask, ArchivedJobGenerationUtils.getTestJob().getJobID().toString(), null);

		compareVertexDetails(originalTask, json);
	}

	private static void compareVertexDetails(AccessExecutionJobVertex originalTask, String json) throws IOException {
		JsonNode result = ArchivedJobGenerationUtils.mapper.readTree(json);

		Assert.assertEquals(originalTask.getJobVertexId().toString(), result.get("id").asText());
		Assert.assertEquals(originalTask.getName(), result.get("name").asText());
		Assert.assertEquals(originalTask.getParallelism(), result.get("parallelism").asInt());
		Assert.assertTrue(result.get("now").asLong() > 0);

		ArrayNode subtasks = (ArrayNode) result.get("subtasks");

		Assert.assertEquals(originalTask.getTaskVertices().length, subtasks.size());
		for (int x = 0; x < originalTask.getTaskVertices().length; x++) {
			AccessExecutionVertex expectedSubtask = originalTask.getTaskVertices()[x];
			JsonNode subtask = subtasks.get(x);

			Assert.assertEquals(x, subtask.get("subtask").asInt());
			Assert.assertEquals(expectedSubtask.getExecutionState().name(), subtask.get("status").asText());
			Assert.assertEquals(expectedSubtask.getCurrentExecutionAttempt().getAttemptNumber(), subtask.get("attempt").asInt());

			TaskManagerLocation location = expectedSubtask.getCurrentAssignedResourceLocation();
			String expectedLocationString = location.getHostname() + ":" + location.dataPort();
			Assert.assertEquals(expectedLocationString, subtask.get("host").asText());
			long start = expectedSubtask.getStateTimestamp(ExecutionState.DEPLOYING);
			Assert.assertEquals(start, subtask.get("start-time").asLong());
			long end = expectedSubtask.getStateTimestamp(ExecutionState.FINISHED);
			Assert.assertEquals(end, subtask.get("end-time").asLong());
			Assert.assertEquals(end - start, subtask.get("duration").asLong());

			ArchivedJobGenerationUtils.compareIoMetrics(expectedSubtask.getCurrentExecutionAttempt().getIOMetrics(), subtask.get("metrics"));
		}
	}
}