/*
 * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.controller.netconf.persist.impl;

import org.opendaylight.controller.config.api.ConflictingVersionException;
import org.opendaylight.controller.netconf.api.NetconfMessage;
import org.opendaylight.controller.netconf.client.NetconfClient;
import org.opendaylight.controller.netconf.client.NetconfClientDispatcher;
import org.opendaylight.controller.netconf.util.xml.XMLNetconfUtil;
import org.opendaylight.controller.netconf.util.xml.XmlElement;
import org.opendaylight.controller.netconf.util.xml.XmlNetconfConstants;
import org.opendaylight.controller.netconf.util.xml.XmlUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import java.util.Set;

public final class Util {
    private static final Logger logger = LoggerFactory.getLogger(Util.class);


    public static boolean isSubset(NetconfClient netconfClient, Set<String> expectedCaps) {
        return isSubset(netconfClient.getCapabilities(), expectedCaps);

    }

    private static boolean isSubset(Set<String> currentCapabilities, Set<String> expectedCaps) {
        for (String exCap : expectedCaps) {
            if (currentCapabilities.contains(exCap) == false)
                return false;
        }
        return true;
    }


    // TODO: check if closing in correct order
    public static void closeClientAndDispatcher(NetconfClient client) {
        NetconfClientDispatcher dispatcher = client.getNetconfClientDispatcher();
        Exception fromClient = null;
        try {
            client.close();
        } catch (Exception e) {
            fromClient = e;
        } finally {
            try {
                dispatcher.close();
            } catch (Exception e) {
                if (fromClient != null) {
                    e.addSuppressed(fromClient);
                }
                throw new RuntimeException("Error closing temporary client ", e);
            }
        }
    }


    public static void checkIsOk(XmlElement element, NetconfMessage responseMessage) throws ConflictingVersionException {
        if (element.getName().equals(XmlNetconfConstants.OK)) {
            return;
        }

        if (element.getName().equals(XmlNetconfConstants.RPC_ERROR)) {
            logger.warn("Can not load last configuration, operation failed");
            // is it ConflictingVersionException ?
            XPathExpression xPathExpression = XMLNetconfUtil.compileXPath("/netconf:rpc-reply/netconf:rpc-error/netconf:error-info/netconf:error");
            String error = (String) XmlUtil.evaluateXPath(xPathExpression, element.getDomElement(), XPathConstants.STRING);
            if (error!=null && error.contains(ConflictingVersionException.class.getCanonicalName())) {
                throw new ConflictingVersionException(error);
            }
            throw new IllegalStateException("Can not load last configuration, operation failed: "
                    + XmlUtil.toString(responseMessage.getDocument()));
        }

        logger.warn("Can not load last configuration. Operation failed.");
        throw new IllegalStateException("Can not load last configuration. Operation failed: "
                + XmlUtil.toString(responseMessage.getDocument()));
    }
}