/*
 * 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.streaming.util;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.metrics.MetricGroup;
import org.apache.flink.metrics.groups.UnregisteredMetricsGroup;
import org.apache.flink.runtime.jobgraph.OperatorID;
import org.apache.flink.runtime.memory.MemoryManager;
import org.apache.flink.runtime.operators.testutils.MockEnvironmentBuilder;
import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
import org.apache.flink.streaming.runtime.tasks.ProcessingTimeService;
import org.apache.flink.streaming.runtime.tasks.TestProcessingTimeService;

import java.util.Collections;

/**
 * Mock {@link StreamingRuntimeContext} to use in tests.
 */
public class MockStreamingRuntimeContext extends StreamingRuntimeContext {

	private final boolean isCheckpointingEnabled;

	private final int numParallelSubtasks;
	private final int subtaskIndex;

	public MockStreamingRuntimeContext(
		boolean isCheckpointingEnabled,
		int numParallelSubtasks,
		int subtaskIndex) {

		super(
			new MockStreamOperator(),
			new MockEnvironmentBuilder()
				.setTaskName("mockTask")
				.setMemorySize(4 * MemoryManager.DEFAULT_PAGE_SIZE)
				.build(),
			Collections.emptyMap());

		this.isCheckpointingEnabled = isCheckpointingEnabled;
		this.numParallelSubtasks = numParallelSubtasks;
		this.subtaskIndex = subtaskIndex;
	}

	@Override
	public MetricGroup getMetricGroup() {
		return new UnregisteredMetricsGroup();
	}

	@Override
	public boolean isCheckpointingEnabled() {
		return isCheckpointingEnabled;
	}

	@Override
	public int getIndexOfThisSubtask() {
		return subtaskIndex;
	}

	@Override
	public int getNumberOfParallelSubtasks() {
		return numParallelSubtasks;
	}

	private static class MockStreamOperator extends AbstractStreamOperator<Integer> {
		private static final long serialVersionUID = -1153976702711944427L;

		private transient TestProcessingTimeService testProcessingTimeService;

		@Override
		public ExecutionConfig getExecutionConfig() {
			return new ExecutionConfig();
		}

		@Override
		public OperatorID getOperatorID() {
			return new OperatorID();
		}

		@Override
		protected ProcessingTimeService getProcessingTimeService() {
			if (testProcessingTimeService == null) {
				testProcessingTimeService = new TestProcessingTimeService();
			}
			return testProcessingTimeService;
		}
	}
}