/*
 * File: WebServicesPDPClient.java
 *
 * Copyright 2007 Macquarie E-Learning Centre Of Excellence
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.fcrepo.server.security.xacml.pep;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.net.URL;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.fcrepo.server.security.RequestCtx;
import org.fcrepo.server.security.xacml.pdp.client.MelcoePDP;
import org.fcrepo.server.security.xacml.pdp.client.MelcoePDPPortType;
import org.jboss.security.xacml.sunxacml.ctx.ResponseCtx;

/**
 * This is the Web Services based client for the MelcoePDP. It uses the classes
 * in org.fcrepo.server.security.xacml.pdp.client which are the Web Service
 * client stubs.
 *
 * @author nishen@melcoe.mq.edu.au
 */
public class WebServicesPDPClient
        implements PDPClient {

    private static final Logger logger = LoggerFactory
            .getLogger(WebServicesPDPClient.class);

    private MelcoePDPPortType client = null;

    /**
     * Initialises the WebServicesPEPClient class.
     *
     * @param options
     *        a Map of options for this class
     * @throws PEPException
     */
    public WebServicesPDPClient(Map<String, String> options)
            throws PEPException {
        try {
            String serviceEndpoint = options.get("ServiceEndpoint");
            if (serviceEndpoint == null || serviceEndpoint.isEmpty()) {
                throw new PEPException("The serviceEnpoint option has not been set in the configuration file.");
            }
            MelcoePDP service = new MelcoePDP(new URL("wsdl"));//TODO
            client = service.getMelcoePDPSOAP11PortHttp();
        } catch (Exception e) {
            logger.error("Could not initialise the PEP Client.");
            throw new PEPException("Could not initialise the PEP Client.", e);
        }
    }

    /*
     * (non-Javadoc)
     * @see
     * org.fcrepo.server.security.xacml.pep.PEPClient#evaluate(java.lang.String)
     */
    @Override
    public String evaluate(String request) throws PEPException {
        if (logger.isDebugEnabled()) {
            logger.debug("Resolving String request:\n" + request);
        }

        String response = null;
        try {
            response = client.evaluate(request);
        } catch (Exception e) {
            logger.error("Error evaluating request.", e);
            throw new PEPException("Error evaluating request", e);
        }

        return response;
    }

    public ResponseCtx evaluate(RequestCtx request) throws PEPException {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            request.encode(bos);
            String response = this.client.evaluate(bos.toString());
            ByteArrayInputStream bis = new ByteArrayInputStream(response.getBytes());
            return ResponseCtx.getInstance(bis);
        } catch (Exception e) {
            logger.error("Error evaluating request.", e);
            throw new PEPException("Error evaluating request", e);
        }
    }
    /*
     * (non-Javadoc)
     * @see
     * org.fcrepo.server.security.xacml.pep.PEPClient#evaluateBatch(java.lang
     * .String[])
     */
    @Override
    public String evaluateBatch(List<String> request) throws PEPException {
        if (request == null) {
            throw new NullPointerException("evaluateBatch(request=null)");
        }
        if (logger.isDebugEnabled()) {
            logger.debug("Resolving request batch (" + request.size()
                    + " requests)");
        }

        String response = null;
        try {
            response = client.evaluateBatch(request);
        } catch (Exception e) {
            logger.error("Error evaluating request.", e);
            throw new PEPException("Error evaluating request", e);
        }

        return response;
    }
}