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package org.simplity.ide;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.simplity.kernel.MessageType;
import org.simplity.kernel.Tracer;
import org.simplity.kernel.comp.ComponentManager;
import org.simplity.kernel.file.FileManager;
import org.simplity.kernel.util.XmlUtil;
import org.simplity.kernel.value.Value;
import org.simplity.service.ServiceContext;
import org.simplity.service.ServiceInterface;
import org.simplity.tp.LogicInterface;
import org.simplity.tp.Service;

/**
 * We send the service.xml file as it is to client
 *
 * @author simplity.org
 * @version $Id: $Id
 */
public class GetService implements LogicInterface {

	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * org.simplity.tp.LogicInterface#execute(org.simplity.service.ServiceContext
	 * )
	 */
	/** {@inheritDoc} */
	@Override
	public Value execute(ServiceContext ctx) {
		String serviceName = ctx.getTextValue("serviceName");
		/*
		 * do we have the required input?
		 */
		if (serviceName == null) {
			ctx.addMessageRow("serviceNameRequired", MessageType.ERROR,
					"service name is required for this service", "serviceName",
					null, null, 0);
			return Value.VALUE_FALSE;
		}

		/*
		 * do we have that service?
		 */
		ServiceInterface service = ComponentManager
				.getServiceOrNull(serviceName);
		if (service == null) {
			ctx.addMessageRow("noService", MessageType.ERROR, serviceName
					+ "  is not a vaid service name.", "serviceName", null,
					null, 0);
			return Value.VALUE_FALSE;
		}

		String xml = null;
		if (service instanceof Service) {
			xml = XmlUtil.objectToXmlString(service);
		} else {
			xml = this.getJavaSource(service);
		}

		if (xml == null) {
			xml = serviceName;
		}

		ctx.setTextValue("xml", xml);
		return Value.VALUE_TRUE;
	}

	/**
	 * @param service
	 * @return
	 */
	private String getJavaSource(ServiceInterface service) {
		Class cls = service.getClass();
		String sourceName = '/' + cls.getName().replace('.', '/') + ".java";
		sourceName = "/org/simplity/test/GetService.class";
		InputStream in = cls.getResourceAsStream(sourceName);
		if (in == null) {
			Tracer.trace("Unable to locate source for " + sourceName);
			return null;
		}
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		try {
			FileManager.copyOut(in, out);
			return out.toString();
		} catch (IOException e) {
			Tracer.trace("Error while copying reource " + e.getMessage());
			return null;
		} finally {
			try {
				in.close();
			} catch (Exception ignore) {
				//
			}
			try {
				out.close();
			} catch (Exception ignore) {
				//
			}
		}
	}
}