package demo;

import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.statemachine.event.OnStateEntryEvent;
import org.springframework.statemachine.event.OnStateExitEvent;
import org.springframework.statemachine.event.StateMachineEvent;

@Configuration
public class CommonConfiguration {

	private final static Log log = LogFactory.getLog(CommonConfiguration.class);

	@Configuration
	static class ApplicationConfig {

		@Bean
		public TestEventListener testEventListener() {
			return new TestEventListener();
		}

		@Bean
		public String stateChartModel() throws IOException {
			ClassPathResource model = new ClassPathResource("statechartmodel.txt");
			InputStream inputStream = model.getInputStream();
			Scanner scanner = new Scanner(inputStream);
			String content = scanner.useDelimiter("\\Z").next();
			scanner.close();
			return content;
		}

	}

	static class TestEventListener implements ApplicationListener<StateMachineEvent> {

		@Override
		public void onApplicationEvent(StateMachineEvent event) {
			if (event instanceof OnStateEntryEvent) {
				OnStateEntryEvent e = (OnStateEntryEvent)event;
				log.info("Entry state " + e.getState().getId());
			} else if (event instanceof OnStateExitEvent) {
				OnStateExitEvent e = (OnStateExitEvent)event;
				log.info("Exit state " + e.getState().getId());
			}
		}

	}

}