/**
 *
 */
package org.gcube.portlets.user.uriresolvermanager.readers;

import static org.gcube.resources.discovery.icclient.ICFactory.clientFor;
import static org.gcube.resources.discovery.icclient.ICFactory.queryFor;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.gcube.common.resources.gcore.ServiceEndpoint;
import org.gcube.common.resources.gcore.ServiceEndpoint.AccessPoint;
import org.gcube.common.resources.gcore.ServiceEndpoint.Property;
import org.gcube.common.resources.gcore.utils.Group;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.portlets.user.uriresolvermanager.entity.ServiceAccessPoint;
import org.gcube.portlets.user.uriresolvermanager.entity.ServiceParameter;
import org.gcube.resources.discovery.client.api.DiscoveryClient;
import org.gcube.resources.discovery.client.queries.api.SimpleQuery;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class RuntimeResourceReader.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Apr 30, 2015
 */
public class RuntimeResourceReader {

	public static final Logger logger = LoggerFactory.getLogger(RuntimeResourceReader.class);

	public List<ServiceAccessPoint> serviceAccessPoints;

	private String resourceName;

	private String entryName;

	/**
	 * Instantiates a new runtime resource reader.
	 *
	 * @param resourceName the resource name
	 * @throws Exception the exception
	 */
	public RuntimeResourceReader(String resourceName) throws Exception {
		this.resourceName = resourceName;
		readResource(resourceName);
	}

	/**
	 * Read resource.
	 *
	 * @param scope        the scope
	 * @param resourceName the resource name
	 * @return the application URI
	 * @throws Exception the exception
	 */
	private void readResource(String resourceName) throws Exception {

		try {
			String scope = ScopeProvider.instance.get();
			logger.info("Trying to read resource: " + resourceName + ", in the scope: " + scope);

			this.resourceName = resourceName;

			SimpleQuery query = queryFor(ServiceEndpoint.class);
			query.addCondition("$resource/Profile/Name/string() eq '" + resourceName + "'");

			DiscoveryClient<ServiceEndpoint> client = clientFor(ServiceEndpoint.class);

			List<ServiceEndpoint> r = client.submit(query);
			if (r == null || r.isEmpty())
				throw new Exception(
						"Cannot retrieve the runtime resource with name: " + resourceName + " in the scope: " + scope);

			ServiceEndpoint se = r.get(0);
			if (se.profile() == null) {
				String msg = "Runtime reosource with resource name: " + resourceName + " is null in the scope: "
						+ scope;
				logger.error(msg);
				throw new Exception(msg);
			}

			Group<AccessPoint> accessPoints = se.profile().accessPoints();
			if (accessPoints.size() == 0)
				throw new Exception("Accesspoint in resource " + resourceName + " not found");

			Iterator<AccessPoint> acIt = accessPoints.iterator();
			serviceAccessPoints = new ArrayList<ServiceAccessPoint>(accessPoints.size());

			while (acIt.hasNext()) {

				AccessPoint ap = acIt.next();

				Group<Property> properties = ap.properties();

				if (properties.size() == 0) {
					logger.warn("Properties in resource " + resourceName + " not found");
				} else {

					List<ServiceParameter> serviceParameters = new ArrayList<ServiceParameter>(properties.size());

					Iterator<Property> iter = properties.iterator();

					while (iter.hasNext()) {

						Property prop = iter.next();

						serviceParameters.add(new ServiceParameter(prop.value(), true));
					}

					serviceAccessPoints.add(new ServiceAccessPoint(ap.name(), ap.address(), serviceParameters));
				}

			}
			logger.debug("Found properties: " + serviceAccessPoints);
			// parameters.setUser(ap.username()); //username
			// String decryptedPassword =
			// StringEncrypter.getEncrypter().decrypt(ap.password());
			// parameters.setPassword(decryptedPassword); //password
			// Group<Property> properties = ap.properties();

		} catch (Exception e) {
			logger.error("Sorry, an error occurred on reading the resource " + resourceName + " Runtime Resource", e);
			throw new Exception(
					"Sorry, an error occurred on reading the resource " + resourceName + " Runtime Reosurce");
		}
	}

	/**
	 * Gets the service access point for entry name.
	 *
	 * @param entryName the entry name
	 * @return the service access point for entry name
	 */
	public ServiceAccessPoint getServiceAccessPointForEntryName(String entryName) {

		for (ServiceAccessPoint serviceAccessPoint : serviceAccessPoints) {
			if (serviceAccessPoint.getEntryName().equals(entryName))
				return serviceAccessPoint;
		}
		return null;
	}

	/**
	 * Gets the resource name.
	 *
	 * @return the resource name
	 */
	public String getResourceName() {
		return resourceName;
	}

	/**
	 * Gets the entry name.
	 *
	 * @return the entryName
	 */
	public String getEntryName() {
		return entryName;
	}

	/**
	 * Gets the service access points.
	 *
	 * @return the serviceAccessPoints
	 */
	public List<ServiceAccessPoint> getServiceAccessPoints() {
		return serviceAccessPoints;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {

		StringBuilder builder = new StringBuilder();
		builder.append("RuntimeResourceReader [serviceAccessPoints=");
		builder.append(serviceAccessPoints);
		builder.append(", resourceName=");
		builder.append(resourceName);
		builder.append(", entryName=");
		builder.append(entryName);
		builder.append("]");
		return builder.toString();
	}

//	public static void main(String[] args) {
//		try {
//			RuntimeResourceReader rr = new RuntimeResourceReader("/gcube", "Gis-Resolver");
//			System.out.println(rr);
//
//			System.out.println(rr.getServiceAccessPointForEntryName("gis"));
//		} catch (Exception e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		}
//	}

}