/*
 * 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.cep.nfa;

import org.apache.flink.cep.Event;
import org.apache.flink.cep.pattern.Pattern;
import org.apache.flink.cep.pattern.conditions.IterativeCondition;
import org.apache.flink.cep.utils.NFATestHarness;
import org.apache.flink.cep.utils.TestTimerService;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.util.TestLogger;

import org.junit.Test;

import java.util.Collections;
import java.util.List;

import static org.apache.flink.cep.utils.EventBuilder.event;
import static org.apache.flink.cep.utils.NFATestHarness.forPattern;
import static org.apache.flink.cep.utils.NFATestUtilities.compareMaps;

/**
 * Tests for accesing time properties from {@link IterativeCondition}.
 */
public class NFAIterativeConditionTimeContextTest extends TestLogger {

	@Test
	public void testEventTimestamp() throws Exception {
		final Event event = event().withId(1).build();
		final long timestamp = 3;

		final Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new IterativeCondition<Event>() {
			@Override
			public boolean filter(Event value, Context<Event> ctx) throws Exception {
				return ctx.timestamp() == timestamp;
			}
		});

		final NFATestHarness testHarness = forPattern(pattern).build();

		final List<List<Event>> resultingPattern = testHarness.feedRecord(new StreamRecord<>(event, timestamp));

		compareMaps(resultingPattern, Collections.singletonList(
			Collections.singletonList(event)
		));
	}

	@Test
	public void testCurrentProcessingTime() throws Exception {
		final Event event1 = event().withId(1).build();
		final Event event2 = event().withId(2).build();

		final Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new IterativeCondition<Event>() {
			@Override
			public boolean filter(Event value, Context<Event> ctx) throws Exception {
				return ctx.currentProcessingTime() == 3;
			}
		});

		final TestTimerService cepTimerService = new TestTimerService();
		final NFATestHarness testHarness = forPattern(pattern)
			.withTimerService(cepTimerService)
			.build();

		cepTimerService.setCurrentProcessingTime(1);
		final List<List<Event>> resultingPatterns1 = testHarness.feedRecord(new StreamRecord<>(event1, 7));
		cepTimerService.setCurrentProcessingTime(3);
		final List<List<Event>> resultingPatterns2 = testHarness.feedRecord(new StreamRecord<>(event2, 8));

		compareMaps(resultingPatterns1, Collections.emptyList());
		compareMaps(resultingPatterns2, Collections.singletonList(
			Collections.singletonList(event2)
		));
	}
}