/*-
 * ============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.sliapi;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.Properties;
import java.util.concurrent.Future;
import org.onap.ccsdk.sli.core.sli.provider.SvcLogicService;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.NotificationPublishService;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.binding.impl.AbstractForwardedDataBroker;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.OptimisticLockFailedException;
import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
import org.opendaylight.controller.sal.binding.api.BindingAwareBroker;
import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.ExecuteGraphInput;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.ExecuteGraphInput.Mode;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.ExecuteGraphInputBuilder;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.ExecuteGraphOutput;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.ExecuteGraphOutputBuilder;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.HealthcheckOutput;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.HealthcheckOutputBuilder;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.SLIAPIService;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.TestResults;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.VlbcheckOutput;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.VlbcheckOutputBuilder;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.execute.graph.input.SliParameter;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.test.results.TestResult;
import org.opendaylight.yang.gen.v1.org.onap.ccsdk.sli.core.sliapi.rev161110.test.results.TestResultBuilder;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.common.RpcError.ErrorType;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableLeafSetEntryNodeBuilder;
import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableLeafSetNodeBuilder;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.util.concurrent.Futures;


/**
 * Defines a base implementation for your provider. This class extends from a helper class
 * which provides storage for the most commonly used components of the MD-SAL. Additionally the
 * base class provides some basic logging and initialization / clean up methods.
 *
 * To use this, copy and paste (overwrite) the following method into the TestApplicationProviderModule
 * class which is auto generated under src/main/java in this project
 * (created only once during first compilation):
 *
 * <pre>

    @Override
    public java.lang.AutoCloseable createInstance() {

         final sliapiProvider provider = new sliapiProvider();
         provider.setDataBroker( getDataBrokerDependency() );
         provider.setNotificationService( getNotificationServiceDependency() );
         provider.setRpcRegistry( getRpcRegistryDependency() );
         provider.initialize();
         return new AutoCloseable() {

            @Override
            public void close() throws Exception {
                //TODO: CLOSE ANY REGISTRATION OBJECTS CREATED USING ABOVE BROKER/NOTIFICATION
                //SERVIE/RPC REGISTRY
                provider.close();
            }
        };
    }


    </pre>
 */
public class sliapiProvider implements AutoCloseable, SLIAPIService{

    private final Logger LOG = LoggerFactory.getLogger( sliapiProvider.class );
    private final String appName = "slitester";

    protected DataBroker dataBroker;
    protected DOMDataBroker domDataBroker;
    protected NotificationPublishService notificationService;
    protected RpcProviderRegistry rpcRegistry;

	protected BindingAwareBroker.RpcRegistration<SLIAPIService> rpcRegistration;

	private static String SLIAPI_NAMESPACE = "org:onap:ccsdk:sli:core:sliapi";
	private static String SLIAPI_REVISION = "2016-11-10";
	private static String SDNC_STATUS_FILE = "SDNC_STATUS_FILE";
	private static String sdncStatusFile = null;

	private static QName TEST_RESULTS_QNAME = null;
	private static QName TEST_RESULT_QNAME = null;
	private static QName TEST_ID_QNAME = null;
	private static QName RESULTS_QNAME = null;

	static {

		TEST_RESULTS_QNAME = QName.create(SLIAPI_NAMESPACE, SLIAPI_REVISION, "test-results");
		TEST_RESULT_QNAME = QName.create(TEST_RESULTS_QNAME, "test-result");
		TEST_ID_QNAME = QName.create(TEST_RESULT_QNAME, "test-identifier");
		RESULTS_QNAME = QName.create(TEST_RESULT_QNAME, "results");
	}


    public sliapiProvider(
			DataBroker dataBroker,
			NotificationPublishService notificationPublishService,
			RpcProviderRegistry rpcProviderRegistry) {
        this.LOG.info( "Creating provider for " + appName );
        this.dataBroker = dataBroker;
        this.notificationService = notificationPublishService;
        this.rpcRegistry = rpcProviderRegistry;
        initialize();
    }



    public void initialize(){
        LOG.info( "Initializing provider for " + appName );
        //initialization code goes here.
        sdncStatusFile = System.getenv(SDNC_STATUS_FILE);
        LOG.info( "SDNC STATUS FILE = " + sdncStatusFile );
        LOG.info( "Initialization complete for " + appName );
    }

    protected void initializeChild() {
        //Override if you have custom initialization intelligence
    }

    @Override
    public void close() throws Exception {
        LOG.info( "Closing provider for " + appName );
        //closing code goes here

	    rpcRegistration.close();
        LOG.info( "Successfully closed provider for " + appName );
    }

    public void setDataBroker(DataBroker dataBroker) {
        this.dataBroker = dataBroker;
		if (dataBroker instanceof AbstractForwardedDataBroker) {
			domDataBroker = ((AbstractForwardedDataBroker) dataBroker).getDelegate();
		}
        if( LOG.isDebugEnabled() ){
            LOG.debug( "DataBroker set to " + (dataBroker==null?"null":"non-null") + "." );
        }
    }

    public void setNotificationService(
            NotificationPublishService notificationService) {
        this.notificationService = notificationService;
        if( LOG.isDebugEnabled() ){
            LOG.debug( "Notification Service set to " + (notificationService==null?"null":"non-null") + "." );
        }
    }

    public void setRpcRegistry(RpcProviderRegistry rpcRegistry) {
        this.rpcRegistry = rpcRegistry;
        if( LOG.isDebugEnabled() ){
            LOG.debug( "RpcRegistry set to " + (rpcRegistry==null?"null":"non-null") + "." );
        }
    }

	@Override
	public Future<RpcResult<ExecuteGraphOutput>> executeGraph(ExecuteGraphInput input) {
		RpcResult<ExecuteGraphOutput> rpcResult = null;

		SvcLogicService svcLogic = getSvcLogicService();
		ExecuteGraphOutputBuilder respBuilder = new ExecuteGraphOutputBuilder();

		String calledModule = input.getModuleName();
		String calledRpc = input.getRpcName();
		Mode calledMode = input.getMode();
		String modeStr = "sync";

		if (calledMode == Mode.Async) {
			modeStr = "async";
		}

		if (svcLogic == null) {
			respBuilder.setResponseCode("500");
			respBuilder.setResponseMessage("Could not locate OSGi SvcLogicService service");
			respBuilder.setAckFinalIndicator("Y");

		    rpcResult = RpcResultBuilder.<ExecuteGraphOutput> status(true).withResult(respBuilder.build()).build();
		    return(Futures.immediateFuture(rpcResult));
		}


		try {
			if (!svcLogic.hasGraph(calledModule, calledRpc, null, modeStr)) {
				respBuilder.setResponseCode("404");
				respBuilder.setResponseMessage("Directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr+" not found");
				respBuilder.setAckFinalIndicator("Y");

			    rpcResult = RpcResultBuilder.<ExecuteGraphOutput> status(true).withResult(respBuilder.build()).build();
			    return(Futures.immediateFuture(rpcResult));
			}
		} catch (Exception e) {
			LOG.error("Caught exception looking for directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr, e);

			respBuilder.setResponseCode("500");
			respBuilder.setResponseMessage("Internal error : could not determine if target graph exists");
			respBuilder.setAckFinalIndicator("Y");

		    rpcResult = RpcResultBuilder.<ExecuteGraphOutput> status(true).withResult(respBuilder.build()).build();
		    return(Futures.immediateFuture(rpcResult));
		}

		// Load properties
		Properties parms = new Properties();

		// Pass properties using names from sli-parameters
		for (SliParameter sliParm : input.getSliParameter()) {

			String propValue = "";

			Boolean boolval = sliParm.isBooleanValue();

			if (boolval != null) {
				propValue = boolval.toString();
			} else {
				Integer intval = sliParm.getIntValue();
				if (intval != null) {
					propValue = intval.toString();
				} else {
					propValue = sliParm.getStringValue();
					if (propValue == null) {
						propValue = "";
					}
				}
			}
			parms.setProperty(sliParm.getParameterName(), propValue);
		}

		// Also, pass "meta" properties (i.e. pass SliParameter objects themselves)
		ExecuteGraphInputBuilder inputBuilder = new ExecuteGraphInputBuilder(input);

		SliapiHelper.toProperties(parms, "input", inputBuilder);

		try {
			LOG.info("Calling directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr);

			if (LOG.isTraceEnabled()) {
				StringBuffer argList = new StringBuffer();
				argList.append("Parameters : {");
				Enumeration e = parms.propertyNames();
				while (e.hasMoreElements()) {
					String propName = (String) e.nextElement();
					argList.append(" ("+propName+","+parms.getProperty(propName)+") ");
				}
				argList.append("}");
				LOG.trace(argList.toString());
				argList = null;
			}



			Properties respProps = svcLogic.execute(calledModule, calledRpc,
					null, modeStr, parms, domDataBroker);

			StringBuilder sb = new StringBuilder("{");

			for (Object key : respProps.keySet()) {
				String keyValue = (String) key;
				if (keyValue != null && !"".equals(keyValue) && !keyValue.contains("input.sli-parameter")) {
					sb.append("\"").append(keyValue).append("\": \"").append(respProps.getProperty(keyValue)).append("\",");
				}
			}

			sb.setLength(sb.length() - 1);
			sb.append("}");

			respBuilder.setResponseCode(respProps.getProperty("error-code", "0"));
			respBuilder.setResponseMessage(respProps.getProperty("error-message", ""));// TODO change response-text to response-message to match other BVC APIs
			respBuilder.setAckFinalIndicator(respProps.getProperty("ack-final", "Y"));
			respBuilder.setContextMemoryJson(sb.toString());

			TestResultBuilder testResultBuilder = new TestResultBuilder();

			SliapiHelper.toBuilder(respProps, testResultBuilder);

			String testIdentifier = testResultBuilder.getTestIdentifier();

			if ((testIdentifier != null) && (testIdentifier.length() > 0)) {

				// Add test results to config tree
				LOG.debug("Saving test results for test id "+testIdentifier);

				DomSaveTestResult(testResultBuilder.build(), true, LogicalDatastoreType.CONFIGURATION);

			}

		} catch (Exception e) {
			LOG.error("Caught exception executing directed graph for"
					+ calledModule + ":" + calledRpc + "," + modeStr + ">", e);

			respBuilder.setResponseCode("500");
			respBuilder
					.setResponseMessage("Internal error : caught exception executing directed graph "
							+ calledModule
							+ "/"
							+ calledRpc
							+ "/"
							+ modeStr);
			respBuilder.setAckFinalIndicator("Y");

		}

		rpcResult = RpcResultBuilder.<ExecuteGraphOutput> status(true)
				.withResult(respBuilder.build()).build();
		return (Futures.immediateFuture(rpcResult));
	}


	private SvcLogicService getSvcLogicService() {
		BundleContext bctx = FrameworkUtil.getBundle(SvcLogicService.class).getBundleContext();

		SvcLogicService svcLogic = null;

    	// Get SvcLogicService reference
		ServiceReference sref = bctx.getServiceReference(SvcLogicService.NAME);
		if (sref  != null)
		{
			svcLogic =  (SvcLogicService) bctx.getService(sref);

		}
		else
		{
			LOG.warn("Cannot find service reference for "+SvcLogicService.NAME);

		}

		return(svcLogic);
	}

	@Override
	public Future<RpcResult<HealthcheckOutput>> healthcheck() {

		RpcResult<HealthcheckOutput> rpcResult = null;
		SvcLogicService svcLogic = getSvcLogicService();

		HealthcheckOutputBuilder respBuilder = new HealthcheckOutputBuilder();

		String calledModule = "sli";
		String calledRpc = "healthcheck";
		String modeStr = "sync";

		if (svcLogic == null) {
			respBuilder.setResponseCode("500");
			respBuilder.setResponseMessage("Could not locate OSGi SvcLogicService service");
			respBuilder.setAckFinalIndicator("Y");

		    rpcResult = RpcResultBuilder.<HealthcheckOutput> failed().withResult(respBuilder.build()).build();
		    return(Futures.immediateFuture(rpcResult));
		}

		try {
			if (!svcLogic.hasGraph(calledModule, calledRpc, null, modeStr)) {
				respBuilder.setResponseCode("404");
				respBuilder.setResponseMessage("Directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr+" not found");

				respBuilder.setAckFinalIndicator("Y");

			    rpcResult = RpcResultBuilder.<HealthcheckOutput> status(true).withResult(respBuilder.build()).build();
			    return(Futures.immediateFuture(rpcResult));
			}
		} catch (Exception e) {
			LOG.error("Caught exception looking for directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr, e);

			respBuilder.setResponseCode("500");
			respBuilder.setResponseMessage("Internal error : could not determine if target graph exists");
			respBuilder.setAckFinalIndicator("Y");

		    rpcResult = RpcResultBuilder.<HealthcheckOutput> failed().withResult(respBuilder.build()).build();
		    return(Futures.immediateFuture(rpcResult));
		}

		try {
			LOG.info("Calling directed graph for "+calledModule+"/"+calledRpc+"/"+modeStr);

			Properties parms = new Properties();

			Properties respProps = svcLogic.execute(calledModule, calledRpc,
					null, modeStr, parms);

			respBuilder.setResponseCode(respProps.getProperty("error-code", "0"));
			respBuilder.setResponseMessage(respProps.getProperty("error-message", ""));
			respBuilder.setAckFinalIndicator(respProps.getProperty("ack-final", "Y"));

		} catch (Exception e) {
			LOG.error("Caught exception executing directed graph for"
					+ calledModule + ":" + calledRpc + "," + modeStr + ">", e);

			respBuilder.setResponseCode("500");
			respBuilder
					.setResponseMessage("Internal error : caught exception executing directed graph "
							+ calledModule
							+ "/"
							+ calledRpc
							+ "/"
							+ modeStr);
			respBuilder.setAckFinalIndicator("Y");

		}

		rpcResult = RpcResultBuilder.<HealthcheckOutput> status(true)
				.withResult(respBuilder.build()).build();
		return (Futures.immediateFuture(rpcResult));
	}

	private void DomSaveTestResult(final TestResult entry, boolean merge, LogicalDatastoreType storeType) {


		if (domDataBroker == null) {
			LOG.error("domDataBroker unset - cannot save test result using DOMDataBroker");
			return;
		}

		MapEntryNode resultNode = null;

		try {
			resultNode = toMapEntryNode(entry);
		} catch (Exception e) {
			LOG.error("Caught exception trying to create map entry node", e);
		}

		if (resultNode == null) {
			LOG.error("Could not convert entry to MapEntryNode");
			return;
		}


		YangInstanceIdentifier testResultsPid = YangInstanceIdentifier.builder().node(TEST_RESULTS_QNAME).node(QName.create(TEST_RESULTS_QNAME, "test-result")).build();
		YangInstanceIdentifier testResultPid = testResultsPid.node(new NodeIdentifierWithPredicates(TEST_RESULT_QNAME, resultNode.getIdentifier().getKeyValues()));



		int tries = 2;
		while(true) {
			try {
				DOMDataWriteTransaction wtx = domDataBroker.newWriteOnlyTransaction();
				if (merge) {
					LOG.info("Merging test identifier "+entry.getTestIdentifier());
					wtx.merge(storeType, testResultPid, resultNode);
				} else {
					LOG.info("Putting test identifier "+entry.getTestIdentifier());
					wtx.put(storeType,  testResultPid, resultNode);
				}
				wtx.submit().checkedGet();
				LOG.trace("Update DataStore succeeded");
				break;
			} catch (final TransactionCommitFailedException e) {
				if(e instanceof OptimisticLockFailedException) {
					if(--tries <= 0) {
						LOG.trace("Got OptimisticLockFailedException on last try - failing ");
						throw new IllegalStateException(e);
					}
					LOG.trace("Got OptimisticLockFailedException - trying again ");
				} else {
					LOG.trace("Update DataStore failed");
					throw new IllegalStateException(e);
				}
			}
		}

	}

		private void SaveTestResult(final TestResult entry, boolean merge, LogicalDatastoreType storeType) throws IllegalStateException
		{
			// Each entry will be identifiable by a unique key, we have to create that identifier
			InstanceIdentifier.InstanceIdentifierBuilder<TestResult> testResultIdBuilder =
					InstanceIdentifier.<TestResults>builder(TestResults.class)
					.child(TestResult.class, entry.getKey());
			InstanceIdentifier<TestResult> path = testResultIdBuilder.toInstance();
			int tries = 2;
			while(true) {
				try {
					WriteTransaction tx = dataBroker.newWriteOnlyTransaction();
					if (merge) {
						tx.merge(storeType, path, entry);
					} else {
						tx.put(storeType, path, entry);
					}
					tx.submit().checkedGet();
					LOG.trace("Update DataStore succeeded");
					break;
				} catch (final TransactionCommitFailedException e) {
					if(e instanceof OptimisticLockFailedException) {
						if(--tries <= 0) {
							LOG.trace("Got OptimisticLockFailedException on last try - failing ");
							throw new IllegalStateException(e);
						}
						LOG.trace("Got OptimisticLockFailedException - trying again ");
					} else {
						LOG.trace("Update DataStore failed");
						throw new IllegalStateException(e);
					}
				}
			}
		}

		private MapEntryNode toMapEntryNode(TestResult testResult) {


			YangInstanceIdentifier testResultId = YangInstanceIdentifier.builder().node(TEST_RESULTS_QNAME).node(TEST_RESULT_QNAME).build();

			// Construct results list
			LinkedList<LeafSetEntryNode<Object>> entryList = new LinkedList<LeafSetEntryNode<Object>>();
			for (String result : testResult.getResults()) {
				LeafSetEntryNode<Object> leafSetEntryNode = ImmutableLeafSetEntryNodeBuilder.create()
																				.withNodeIdentifier(new NodeWithValue(RESULTS_QNAME, result))
																				.withValue(result)
																				.build();
				entryList.add(leafSetEntryNode);
			}
			// Construct results LeafSetNode
			LeafSetNode<?> resultsNode = ImmutableLeafSetNodeBuilder.create().withNodeIdentifier(new NodeIdentifier(RESULTS_QNAME)).withValue(entryList).build();



			// Construct test result ContainerNode with 2 children - test-identifier leaf and results leaf-set
			MapEntryNode testResultNode = ImmutableNodes.mapEntryBuilder()
					.withNodeIdentifier(new NodeIdentifierWithPredicates(TEST_RESULT_QNAME, TEST_ID_QNAME, testResult.getTestIdentifier()))
					.withChild(ImmutableNodes.leafNode(TEST_ID_QNAME, testResult.getTestIdentifier()))
					.withChild(resultsNode)
					.build();

			return(testResultNode);

		}

		@Override
		public Future<RpcResult<VlbcheckOutput>> vlbcheck() {
			RpcResult<VlbcheckOutput> rpcResult = null;
			VlbcheckOutputBuilder respBuilder = new VlbcheckOutputBuilder();
			boolean suspended = false;
			BufferedReader br = null;
			String line = "";

			// check the state based on the config file

			if (sdncStatusFile != null) {
				try	{
					br = new BufferedReader(new FileReader(sdncStatusFile));
					while((line = br.readLine()) != null)
					{
						if ("ODL_STATE=SUSPENDED".equals(line)) {
							suspended = true;
							LOG.debug("vlbcheck: server is suspended");
						}
					}
					br.close();
				} catch (FileNotFoundException e) {
					LOG.trace("Caught File not found exception " + sdncStatusFile +"\n",e);
				} catch (Exception e) {
					LOG.trace("Failed to read status file " + sdncStatusFile +"\n",e);
				} finally {
					if (br != null) {
						try {
							br.close();
						} catch (IOException e) {
							LOG.warn("Failed to close status file " + sdncStatusFile +"\n",e);
						}
					}
				}
			}

			if (suspended) {
				rpcResult = RpcResultBuilder.<VlbcheckOutput>failed().withError(ErrorType.APPLICATION,
						"resource-denied", "Server Suspended").build();
			} else {
				respBuilder.setResponseMessage("server is normal");
				rpcResult = RpcResultBuilder.<VlbcheckOutput> status(true)
						.withResult(respBuilder.build()).build();
			}
			return (Futures.immediateFuture(rpcResult));
		}
}