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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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 */

package org.glassfish.web.admin.monitor.statistics;

import org.jvnet.hk2.annotations.Service;

import org.glassfish.hk2.api.PerLookup;
import javax.inject.Inject;
import org.glassfish.api.ActionReport;
import org.glassfish.api.ActionReport.ExitCode;
import org.glassfish.external.statistics.CountStatistic; 
import org.glassfish.external.statistics.RangeStatistic; 
import org.glassfish.admin.monitor.cli.MonitorContract;
import org.glassfish.flashlight.datatree.TreeNode;
import org.glassfish.flashlight.MonitoringRuntimeDataRegistry;
import org.glassfish.web.admin.LogFacade;
import java.util.List;
import java.util.ResourceBundle;

@Service
@PerLookup
public class AltServletStatsImpl implements MonitorContract {

    private static final ResourceBundle rb = LogFacade.getLogger().getResourceBundle();

    @Inject
    private MonitoringRuntimeDataRegistry mrdr;

    private final static String name = "servlet";

    private final static String displayFormat = "%1$-10s %2$-10s %3$-10s";

    public String getName() {
        return name;
    }

    public ActionReport process(final ActionReport report, final String filter) {

        if (mrdr == null) {
            report.setActionExitCode(ActionReport.ExitCode.FAILURE);
            report.setMessage(rb.getString(LogFacade.MRDR_NULL));
            return report;
        }

        TreeNode serverNode = mrdr.get("server");
        if (serverNode == null) {
            report.setActionExitCode(ActionReport.ExitCode.FAILURE);
            report.setMessage(rb.getString(LogFacade.MRDR_NULL));
            return report;
        }

        String [] patternArr = new String [] {"server.web.servlet.*"};
        
	long activeServletsLoadedCount = 0; 
	long maxServletsLoadedCount = 0; 
	long totalServletsLoadedCount = 0;

        for (String pattern : patternArr) {
            List tnL = serverNode.getNodes(pattern);
            for (TreeNode tn : tnL) {
                if (tn.hasChildNodes()) {
                    continue;
                }
                if ("activeservletsloadedcount".equals(tn.getName())) { 
                    activeServletsLoadedCount = getRangeStatisticValue(tn.getValue());
                } else if ("maxservletsloadedcount".equals(tn.getName())) { 
                    maxServletsLoadedCount = getCountStatisticValue(tn.getValue());
                } else if ("totalservletsloadedcount".equals(tn.getName())) { 
                    totalServletsLoadedCount = getCountStatisticValue(tn.getValue());
                }
            }
        }

        report.setMessage(String.format(displayFormat, 
                activeServletsLoadedCount, maxServletsLoadedCount,
                totalServletsLoadedCount));

        report.setActionExitCode(ExitCode.SUCCESS);
        return report;
    }

    private long getCountStatisticValue(Object obj) {
        long l = 0L;
        if (obj == null) return l;
        if (obj instanceof CountStatistic) {
            return ((CountStatistic)obj).getCount();
        }
        return l;
    }

    private long getRangeStatisticValue(Object obj) {
        long l = 0L;
        if (obj == null) return l;
        if (obj instanceof RangeStatistic) {
            return ((RangeStatistic)obj).getCurrent();
        }
        return l;
    }
}