/*
 * $Id$
 *
 * This file is part of the Cloud Services Integration Platform (CSIP),
 * a Model-as-a-Service framework, API and application suite.
 *
 * 2012-2017, Olaf David and others, OMSLab, Colorado State University.
 *
 * OMSLab licenses this file to you under the MIT license.
 * See the LICENSE file in the project root for more information.
 */
package csip;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.xml.bind.DatatypeConverter;

/**
 *
 * @author od
 */
interface ResultStore {

    /**
     *
     * @param request
     * @return the result json.
     * @throws Exception
     */
    String getResult(String request);


    /**
     * Returns hash
     * @param digest
     * @param results
     * @throws Exception
     */
    void putResult(String digest, String results);


    /**
     * Get the digest.
     * @param request
     * @return the sha1 digest.
     */
    default String getDigest(String request) {
        request = request.replace(" ", "").replace("\n", "").replace("\t", "");
        try {
            return DatatypeConverter.printHexBinary(MessageDigest.getInstance("SHA1").digest(request.getBytes("UTF-8"))).toLowerCase();
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException ex) {
            return null;
        }
    }


    /**
     * Purge the results.
     */
    void purge();


    /**
     * Shut down the resource
     * @throws Exception
     */
    default void shutdown() throws Exception {
    }

    /**
     *
     */
    ResultStore NONE = new ResultStore() {
        @Override
        public String getResult(String request) {
            return null;
        }


        @Override
        public void putResult(String digest, String results) {
        }


        @Override
        public String getDigest(String request) {
            return null;
        }


        @Override
        public void purge() {
        }
    };

}