package nlphub;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.gcube.data.analysis.nlphub.shared.Constants;
import org.junit.Assert;
import org.junit.Test;

public class DiscoverDataMinerServiceTest {
	private static final Logger logger = LoggerFactory.getLogger(DiscoverDataMinerServiceTest.class);

	@Test
	public void discover() {
		if (Constants.TEST_ENABLE) {

			try {
				String dataMinerServiceUrl = null;
				String urlInformationSystem = "http://registry.d4science.org/icproxy/gcube/service/ServiceEndpoint/DataAnalysis/DataMiner?";

				logger.debug("Request url: " + urlInformationSystem);
				urlInformationSystem += "gcube-token=" + "f57441ac-b361-4c2d-992a-40db034f1b8c-843339462";
				URL url = new URL(urlInformationSystem);

				HttpURLConnection connection = null;

				connection = (HttpURLConnection) url.openConnection();
				connection.setRequestMethod("GET");
				connection.setDoInput(true);
				connection.setDoOutput(false);
				connection.setUseCaches(false);

				try (BufferedReader r = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
					dataMinerServiceUrl = readProfileInfo(r);
				}
				
				logger.debug("DataMinerServiceUrl: " + dataMinerServiceUrl);
				Assert.assertTrue(true);
			} catch (Throwable e) {
				logger.error("Error retrieving DataMinerServiceUrl: "+e.getLocalizedMessage(),e);
				Assert.fail("Error retrieving DataMinerServiceUrl: "+e.getLocalizedMessage());
			}
		} else {
			Assert.assertTrue(true);
		}

	}

	private String readProfileInfo(BufferedReader r) throws FactoryConfigurationError, XMLStreamException {
		String dataMinerServiceUrl = null;
		XMLInputFactory xmlInFact = XMLInputFactory.newInstance();
		XMLStreamReader reader = xmlInFact.createXMLStreamReader(r);
		while (reader.hasNext()) {
			int eventType = reader.next();
			if (eventType == XMLStreamConstants.START_ELEMENT) {
				logger.debug("Read Element: " + reader.getLocalName());
				if (reader.getLocalName().compareToIgnoreCase("EndPoint") == 0) {
					logger.debug("Attribute count:" + reader.getAttributeCount());
					for (int i = 0; i < reader.getAttributeCount(); i++) {
						logger.debug("Attribute Name: " + reader.getAttributeName(i));
						logger.debug("Attribute Value: " + reader.getAttributeValue(i));
						if (reader.getAttributeName(i).toString().compareToIgnoreCase("EntryName") == 0
								&& reader.getAttributeValue(i).toString()
										.compareToIgnoreCase("dataminer-prototypes.d4science.org") == 0) {
							dataMinerServiceUrl = reader.getElementText();
							dataMinerServiceUrl = dataMinerServiceUrl.replace("\\n", "").replace("\\r", "");
							logger.debug("DataMiner service url retrieved: " + dataMinerServiceUrl);
							return dataMinerServiceUrl;
						}

					}

				}
			}
		}
		return dataMinerServiceUrl;
	}
}