/*-
 * ============LICENSE_START=======================================================
 * ONAP : CCSDK
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights
 * 						reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.ccsdk.sli.core.sli.provider;

import org.onap.ccsdk.sli.core.sli.MetricLogger;
import org.onap.ccsdk.sli.core.sli.SvcLogicAdaptor;
import org.onap.ccsdk.sli.core.sli.SvcLogicContext;
import org.onap.ccsdk.sli.core.sli.SvcLogicException;
import org.onap.ccsdk.sli.core.sli.SvcLogicJavaPlugin;
import org.onap.ccsdk.sli.core.sli.SvcLogicNode;
import org.onap.ccsdk.sli.core.sli.SvcLogicRecorder;
import org.onap.ccsdk.sli.core.sli.SvcLogicResource;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class SvcLogicNodeExecutor {

	public abstract SvcLogicNode execute(SvcLogicService svc, SvcLogicNode node, SvcLogicContext ctx) throws SvcLogicException;

    private static final Logger LOG = LoggerFactory.getLogger(SvcLogicNodeExecutor.class);

    protected String evaluateNodeTest(SvcLogicNode node, SvcLogicContext ctx)
			throws SvcLogicException {
		if (node == null) {
			return null;
		}

		return (SvcLogicExpressionResolver.evaluate(node.getAttribute("test"),
				node, ctx));

	}


    protected SvcLogicAdaptor getAdaptor(String adaptorName) {
        return SvcLogicAdaptorFactory.getInstance(adaptorName);
    }

    protected SvcLogicResource getSvcLogicResource(String plugin) {
        BundleContext bctx = FrameworkUtil.getBundle(this.getClass())
                .getBundleContext();

        ServiceReference sref = bctx.getServiceReference(plugin);
        if (sref != null) {
            SvcLogicResource resourcePlugin = (SvcLogicResource) bctx
                    .getService(sref);
            return resourcePlugin;
        }
        else {
            LOG.warn("Could not find service reference object for plugin " + plugin);
            return null;
        }
    }

    protected SvcLogicRecorder getSvcLogicRecorder(String plugin) {
        BundleContext bctx = FrameworkUtil.getBundle(this.getClass())
                .getBundleContext();

        ServiceReference sref = bctx.getServiceReference(plugin);
        if (sref != null) {
            SvcLogicRecorder resourcePlugin = (SvcLogicRecorder) bctx
                    .getService(sref);
            return resourcePlugin;
        }
        else {
            return null;
        }
    }

    protected SvcLogicJavaPlugin getSvcLogicJavaPlugin(String pluginName){
        BundleContext bctx = FrameworkUtil.getBundle(this.getClass())
                 .getBundleContext();

         ServiceReference sref = bctx.getServiceReference(pluginName);

         if (sref == null) {
             LOG.warn("Could not find service reference object for plugin " + pluginName);
             return null;
         } else {
             SvcLogicJavaPlugin plugin  = (SvcLogicJavaPlugin) bctx
                     .getService(sref);
             return plugin;
         }
 }
    protected SvcLogicNode getNextNode(SvcLogicNode node, String outValue) {
        MetricLogger.resetContext();
        SvcLogicNode nextNode = node.getOutcomeValue(outValue);
        if (nextNode != null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("about to execute " + outValue + " branch");
            }
            return (nextNode);
        }

        nextNode = node.getOutcomeValue("Other");
        if (nextNode != null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("about to execute Other branch");
            }
        } else {
            if (LOG.isDebugEnabled()) {
                LOG.debug("no " + outValue + " or Other branch found");
            }
        }
        return (nextNode);
    }
}