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package net.brutex.xservices.ws.rs;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.jcs.JCS;
import org.apache.jcs.access.exception.CacheException;
import org.apache.log4j.Logger;
import org.netbeans.lib.cvsclient.Client;
import org.netbeans.lib.cvsclient.command.CommandAbortedException;
import org.netbeans.lib.cvsclient.command.CommandException;
import org.netbeans.lib.cvsclient.command.checkout.CheckoutCommand;
import org.netbeans.lib.cvsclient.command.checkout.ModuleListInformation;
import org.netbeans.lib.cvsclient.command.log.LogInformation;
import org.netbeans.lib.cvsclient.command.log.RlogCommand;
import org.netbeans.lib.cvsclient.connection.AuthenticationException;
import org.netbeans.lib.cvsclient.event.FileInfoEvent;

import net.brutex.xservices.types.scm.ModuleType;
import net.brutex.xservices.types.scm.FileType;
import net.brutex.xservices.types.scm.Revision;
import net.brutex.xservices.util.BasicCVSListener;
import net.brutex.xservices.util.CVSClient;

/**
 * @author Brian Rosenberger
 * @since 0.5.0-20120824
 * 
 */
public class CVSInfoImpl implements CVSInfo {
        
        final Logger logger = Logger.getLogger(CVSInfoImpl.class);

        public Response getRepositoryFiles(HttpHeaders h, File f, String modules,
                        boolean showRevisions,
                        boolean forceNoCache) {

                final List<FileType> list = new ArrayList<FileType>();

                String cachekey = "getFiles" + f.toURI().toString();
                logger.debug("forceNoCache="+forceNoCache);
                List<FileType> cacheresult = (List<FileType>) getCacheInstance().get(
                                cachekey);

                if (!forceNoCache && cacheresult != null) {
                        // Cache hit
                        list.addAll(cacheresult);
                } else {
                        // Cache miss
                        try {
                                CVSClient cvsclient = new CVSClient(f);
                                Client client = cvsclient.client;

                                client.getEventManager().addCVSListener(new BasicCVSListener() {
                                        @Override
                                        public void fileInfoGenerated(FileInfoEvent arg0) {
                                                LogInformation info = (LogInformation) arg0
                                                                .getInfoContainer();
                                                FileType cvsfile = new FileType(info.getFile(), info
                                                                .getRepositoryFilename(), info.getDescription());
                                                cvsfile.setHeadRevision(info.getHeadRevision());
                                                cvsfile.setBranch(info.getBranch());
                                                cvsfile.setTotalRevisions(info.getTotalRevisions());
                                                for (LogInformation.Revision r : info.getRevisionList()) {
                                                        cvsfile.addRevision(new Revision(r.getNumber(), r
                                                                        .getMessage()));
                                                }
                                                list.add(cvsfile);
                                        }
                                });

                                RlogCommand rlog = new RlogCommand();
                                StringTokenizer tk = new StringTokenizer(modules, ",");
                                while (tk.hasMoreTokens()) {
                                        rlog.setModule(tk.nextToken());
                                }
                                if (rlog.getModules().length == 0)
                                        rlog.setModule("");

                                rlog.setDefaultBranch(true); // -b Print information about the
                                                                                                // revisions on the default
                                                                                                // branch,
                                                                                                // normally the highest branch
                                                                                                // on
                                                                                                // the trunk.
                                rlog.setNoTags(true); // -N Do not print the list of tags for
                                                                                // this
                                                                                // file. This option can be very useful
                                                                                // when
                                                                                // your site uses a lot of tags, so
                                                                                // rather
                                                                                // than "more"'ing over 3 pages of tag
                                                                                // information, the log information is
                                                                                // presented without tags at all.
                                rlog.setHeaderAndDescOnly(false); // -t Print only the name of
                                                                                                        // the
                                                                                                        // rcs file, name of the
                                                                                                        // file in
                                                                                                        // the working directory,
                                                                                                        // head,
                                                                                                        // default branch, access
                                                                                                        // list,
                                                                                                        // locks, symbolic names,
                                                                                                        // and
                                                                                                        // suffix. + description
                                // rlog.setRevisionFilter("1.1.");
                                // rlog.setSuppressHeader(true); // -S Supress log output when
                                // no
                                // revisions are selected within a file.
                                client.executeCommand(rlog, cvsclient.getGlobalOptions());
                                logger.info("Execute CVS command '" + rlog.getCVSCommand() + "' against '"+cvsclient.getRoot().host+"@" + cvsclient.getRoot().repository+"'");
                                //need to put a new list into cache as we will filter the result 
                                //afterwards
                                getCacheInstance().put(cachekey, new ArrayList<FileType>(list));
                                
                                
                        } catch (ConfigurationException e) {
                                logger.error("CVS Configuration File '"
                                                + f.getAbsolutePath() + f.getName() + "'not found.", e);
                                
                        } catch (CommandAbortedException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        } catch (AuthenticationException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        } catch (CommandException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        } catch (CacheException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        }

                }
                
                
                // prepare output after everything is cached
                if (!showRevisions) {
                        for (FileType t : list) {
                                t.clearRevisionList();
                        }
                }
                
                GenericEntity entity = new GenericEntity<List<FileType>>(list) {};
                return Response.ok(entity).build();
        }

        @Override
        public Response getModules(HttpHeaders h, File f, boolean forceNoCache) {

                // Try to deliver from Cache
                String cachekey = "Modules" + f.toURI().toString();
                logger.debug("forceNoCache="+forceNoCache);
                List<ModuleType> response = (List<ModuleType>) getCacheInstance().get(
                                cachekey);
                if (!forceNoCache && response != null) {
                        GenericEntity entity = new GenericEntity<List<ModuleType>>(response) {
                        };
                        return Response.ok(entity).build();
                }
                // -------------------------

                try {
                        CVSClient cvsclient = new CVSClient(f);
                        Client client = cvsclient.client;

                        final List<ModuleType> list = new ArrayList<ModuleType>();

                        client.getEventManager().addCVSListener(new BasicCVSListener() {
                                public void fileInfoGenerated(FileInfoEvent e) {
                                        ModuleListInformation info = (ModuleListInformation) e
                                                        .getInfoContainer();

                                        list.add(new ModuleType(info.getModuleName(), info
                                                        .getModuleStatus(), info.getPaths(), info.getType()));
                                }
                        });

                        CheckoutCommand co = new CheckoutCommand();
                        co.setShowModulesWithStatus(true);

                        client.executeCommand(co, cvsclient.getGlobalOptions());
                        logger.info("Execute CVS command '" + co.getCVSCommand() + "' against '"+cvsclient.getRoot().host+"@" + cvsclient.getRoot().repository+"'");
                        if(list.size()==0) {
                                logger.warn("Repository '" + cvsclient.getRoot().repository + "' does not have modules");
                                list.add(new ModuleType("","","",""));
                        }
                        
                        GenericEntity entity = new GenericEntity<List<ModuleType>>(list) {
                        };
                        getCacheInstance().put(cachekey, list);
                        return Response.ok(entity).build();
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return Response.serverError().build();
        }

        /**
         * Get the caching manager for CVS objects
         * 
         * @return The CVSCaching JCS region
         */
        public JCS getCacheInstance() {
                JCS jcs = null;
                final String cacheinstance = "CVSCache";
                try {
                        logger.debug("Getting cache instance named '"+cacheinstance+"'" );
                        jcs = JCS.getInstance(cacheinstance);
                } catch (CacheException e) {
                        logger.error("Failed to get cache instance", e);
                        e.printStackTrace();
                }
                return jcs;
        }

}