package org.gcube.resourcemanagement.manager.webapp.context;

import java.util.Objects;

import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryContextClient;
import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryContextClientFactory;
import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryContextClientImpl;
import org.gcube.resourcemanagement.manager.io.exceptions.CodeException;
import org.gcube.resourcemanagement.manager.io.exceptions.RMCode;

/**
 * Base request to an operation exposed by the Resource Registry.
 * 
 * @author Manuele Simi (ISTI-CNR)
 *
 */
public abstract class RequestToResourceRegistry {

	protected ResourceRegistryContextClient resourceRegistryContextClient;

	/**
	 * Forces to use a RR instance at the given url.
	 * 
	 * @param forceURL
	 */
	public RequestToResourceRegistry forceURL(String forceURL) {
		this.resourceRegistryContextClient = new ResourceRegistryContextClientImpl(forceURL);
		return this;
	}

	/**
	 * Validates the request.
	 * 
	 * @return the response from the service.
	 */
	abstract public RequestToResourceRegistry validate() throws Exception;

	public ResponseFromResourceRegistry submit() {
		try {
			this.validate();
		} catch (Exception e) {
			ResponseFromResourceRegistry response = ResponseFromResourceRegistry.
					fromException(new CodeException(RMCode.INVALID_REQUEST));
			return response;
		}
		if (Objects.isNull(this.resourceRegistryContextClient))
			this.resourceRegistryContextClient = ResourceRegistryContextClientFactory.create();
		return this.validateResponse(this.send());
	}

	/**
	 * Gives a chance to sub-classes to validate the response.
	 * 
	 * @param response
	 * @return
	 */
	protected ResponseFromResourceRegistry validateResponse(ResponseFromResourceRegistry response) {
		// by default, returns the response as it is
		return response;
	}

	/**
	 * Submits the request to the RR.
	 * 
	 * @return the response from the service.
	 */
	abstract protected ResponseFromResourceRegistry send();

}