/*
 * 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.query;

import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.runtime.state.KeyGroupRange;
import org.junit.Test;

import java.net.InetAddress;
import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertEquals;

public class KvStateLocationTest {

	/**
	 * Simple test registering/unregistereing state and looking it up again.
	 */
	@Test
	public void testRegisterAndLookup() throws Exception {
		JobID jobId = new JobID();
		JobVertexID jobVertexId = new JobVertexID();
		int numKeyGroups = 123;
		int numRanges = 10;
		int fract = numKeyGroups / numRanges;
		int remain = numKeyGroups % numRanges;
		List<KeyGroupRange> keyGroupRanges = new ArrayList<>(numRanges);

		int start = 0;
		for (int i = 0; i < numRanges; ++i) {
			int end = start + fract - 1;
			if(remain > 0) {
				--remain;
				++end;
			}
 			KeyGroupRange range = new KeyGroupRange(start, end);
			keyGroupRanges.add(range);
			start = end + 1;
		}

		String registrationName = "asdasdasdasd";

		KvStateLocation location = new KvStateLocation(jobId, jobVertexId, numKeyGroups, registrationName);

		KvStateID[] kvStateIds = new KvStateID[numRanges];
		KvStateServerAddress[] serverAddresses = new KvStateServerAddress[numRanges];

		InetAddress host = InetAddress.getLocalHost();

		// Register
		int registeredCount = 0;
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			kvStateIds[rangeIdx] = new KvStateID();
			serverAddresses[rangeIdx] = new KvStateServerAddress(host, 1024 + rangeIdx);
			KeyGroupRange keyGroupRange = keyGroupRanges.get(rangeIdx);
			location.registerKvState(keyGroupRange, kvStateIds[rangeIdx], serverAddresses[rangeIdx]);
			registeredCount += keyGroupRange.getNumberOfKeyGroups();
			assertEquals(registeredCount, location.getNumRegisteredKeyGroups());
		}

		// Lookup
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			KeyGroupRange keyGroupRange = keyGroupRanges.get(rangeIdx);
			for(int keyGroup = keyGroupRange.getStartKeyGroup(); keyGroup <= keyGroupRange.getEndKeyGroup(); ++keyGroup) {
				assertEquals(kvStateIds[rangeIdx], location.getKvStateID(keyGroup));
				assertEquals(serverAddresses[rangeIdx], location.getKvStateServerAddress(keyGroup));
			}
		}

		// Overwrite
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			kvStateIds[rangeIdx] = new KvStateID();
			serverAddresses[rangeIdx] = new KvStateServerAddress(host, 1024 + rangeIdx);

			location.registerKvState(keyGroupRanges.get(rangeIdx), kvStateIds[rangeIdx], serverAddresses[rangeIdx]);
			assertEquals(registeredCount, location.getNumRegisteredKeyGroups());
		}

		// Lookup
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			KeyGroupRange keyGroupRange = keyGroupRanges.get(rangeIdx);
			for(int keyGroup = keyGroupRange.getStartKeyGroup(); keyGroup <= keyGroupRange.getEndKeyGroup(); ++keyGroup) {
				assertEquals(kvStateIds[rangeIdx], location.getKvStateID(keyGroup));
				assertEquals(serverAddresses[rangeIdx], location.getKvStateServerAddress(keyGroup));
			}
		}

		// Unregister
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			KeyGroupRange keyGroupRange = keyGroupRanges.get(rangeIdx);
			location.unregisterKvState(keyGroupRange);
			registeredCount -= keyGroupRange.getNumberOfKeyGroups();
			assertEquals(registeredCount, location.getNumRegisteredKeyGroups());
		}

		// Lookup
		for (int rangeIdx = 0; rangeIdx < numRanges; rangeIdx++) {
			KeyGroupRange keyGroupRange = keyGroupRanges.get(rangeIdx);
			for(int keyGroup = keyGroupRange.getStartKeyGroup(); keyGroup <= keyGroupRange.getEndKeyGroup(); ++keyGroup) {
				assertEquals(null, location.getKvStateID(keyGroup));
				assertEquals(null, location.getKvStateServerAddress(keyGroup));
			}
		}

		assertEquals(0, location.getNumRegisteredKeyGroups());
	}
}