/*
 * Copyright 2017 the original author or authors.
 *
 * Licensed 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.springframework.statemachine;

import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.Matchers.notNullValue;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.EnumStateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;

public class StateMachineSmokeTests extends AbstractStateMachineTests {

	@Override
	protected AnnotationConfigApplicationContext buildContext() {
		return new AnnotationConfigApplicationContext();
	}

	@Test(timeout = 10000)
	public void testLifecycleThreading() throws Exception {
		context.register(Config1.class);
		context.refresh();
		assertTrue(context.containsBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE));
		@SuppressWarnings("unchecked")
		ObjectStateMachine<TestStates,TestEvents> machine =
				context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
		assertThat(machine, notNullValue());

		int cnt = 10;
		Thread[] threads = new Thread[cnt];
		for (int i = 0; i < cnt; i++) {
			threads[i] = new Thread(() -> {
				for (int j = 0; j < 1000; j++) {
					machine.start();
					machine.sendEvent(TestEvents.E1);
					machine.stop();
				}
			});
		}
		for (Thread t : threads) {
			t.start();
		}
		for (Thread t : threads) {
			t.join();
		}
		assertThat(machine.getState(), nullValue());
	}

	@Configuration
	@EnableStateMachine
	static class Config1 extends EnumStateMachineConfigurerAdapter<TestStates, TestEvents> {

		@Override
		public void configure(StateMachineStateConfigurer<TestStates, TestEvents> states) throws Exception {
			states
				.withStates()
					.initial(TestStates.S1)
					.state(TestStates.S2);
		}

		@Override
		public void configure(StateMachineTransitionConfigurer<TestStates, TestEvents> transitions) throws Exception {
			transitions
				.withExternal()
					.source(TestStates.S1)
					.target(TestStates.S2)
					.event(TestEvents.E1)
					.and()
				.withExternal()
					.source(TestStates.S2)
					.target(TestStates.S1)
					.event(TestEvents.E1);
		}
	}

}
