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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.netbeans.modules.git;

import java.io.File;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.netbeans.api.progress.ProgressHandle;
import org.netbeans.libs.git.GitException;
import org.netbeans.libs.git.GitRevisionInfo;
import org.netbeans.libs.git.GitRevisionInfo.GitFileInfo;
import org.netbeans.libs.git.SearchCriteria;
import org.netbeans.libs.git.progress.ProgressMonitor;
import org.netbeans.modules.git.client.GitClient;
import org.netbeans.modules.git.client.GitProgressSupport;
import org.netbeans.modules.git.utils.GitUtils;
import org.openide.util.NbBundle;

/**
 *
 * @author Tomas Stupka
 */
public class HistoryRegistry {
    private static HistoryRegistry instance;

    private static final Logger LOG = Logger.getLogger("org.netbeans.modules.mercurial.HistoryRegistry"); // NOI18N
    
    private Map> logs = Collections.synchronizedMap(new HashMap>());
    private Map>> changesets = new HashMap>>();
    
    private HistoryRegistry() {}
    
    public static synchronized HistoryRegistry getInstance() {
        if(instance == null) {
            instance = new HistoryRegistry();
        }
        return instance;
    }
    
    public GitRevisionInfo[] getLogs (File repository, File[] files, Date from, Date to, ProgressMonitor pm) throws GitException {
        GitClient client = Git.getInstance().getClient(repository);
        SearchCriteria crit = new SearchCriteria();
        crit.setFrom(from);
        crit.setTo(to);
        crit.setRevisionTo(GitUtils.HEAD);
        crit.setFiles(files);
        crit.setFollowRenames(true);
        crit.setIncludeMerges(false);
        try {
            GitRevisionInfo[] history = client.log(crit, false, pm);
            if (!pm.isCanceled() && history.length > 0) {
                for (File f : files) {
                    logs.put(f, Arrays.asList(history));
                }
            }
            return history;
        } finally {
            if (client != null) {
                client.release();
            }
        }
    }
    
    public File getHistoryFile(final File repository, final File originalFile, final String revision, final boolean dryTry) {
        long t = System.currentTimeMillis();
        String originalPath = GitUtils.getRelativePath(repository, originalFile);
        try {
            final List history = logs.get(originalFile);
            final String path = originalPath;
            Map> fileChangesets = changesets.get(originalFile);
            if(fileChangesets == null) {
                fileChangesets = new HashMap>();
                changesets.put(originalFile, fileChangesets);
            }
            final Map> fcs = fileChangesets;
            final String[] ret = new String[] {null};
            if(history != null) {
                GitProgressSupport support = new GitProgressSupport() {
                    @Override
                    protected void perform() {
                        ret[0] = getRepositoryPathIntern(history, revision, fcs, repository, originalFile, path, dryTry, getProgressHandle(), getProgressMonitor());
                    }
                };
                support.start(Git.getInstance().getRequestProcessor(repository), repository, NbBundle.getMessage(HistoryRegistry.class, "LBL_LookingUp")).waitFinished(); //NOI18N
            }
            if(ret[0] != null && !ret[0].equals(originalPath)) {
                return new File(repository, ret[0]);
            }
            return null;

        } finally { 
            if(LOG.isLoggable(Level.FINE)) {
                LOG.log(Level.FINE, " resolving historyFile for {0} took {1}", new Object[]{originalPath, System.currentTimeMillis() - t}); //NOI18N
            }
        }
    }

    private String getRepositoryPathIntern (List history, String revision, Map> fileChangesets, 
            File repository, File originalFile, final String path, boolean dryTry, ProgressHandle progressHandle, ProgressMonitor pm) {
        int count = 0;
        String historyPath = path;
        Iterator it = history.iterator();
        while(it.hasNext() && !revision.equals(it.next().getRevision())) {
            count++;
        }
        progressHandle.switchToDeterminate(count);
        
        // XXX try dry first, might be it will lead to the in in the revision
        for (int i = 0; i < history.size() && !pm.isCanceled(); i ++) {
            GitRevisionInfo lm = history.get(i);
            String historyRevision = lm.getRevision();
            if(historyRevision.equals(revision)) {
                break;
            }
            progressHandle.progress(NbBundle.getMessage(HistoryRegistry.class, "LBL_LookingUpAtRevision", originalFile.getName(), historyRevision), i); //NOI18N
            List changePaths = fileChangesets.get(historyRevision);
            if(changePaths == null && !dryTry) {
                long t1 = System.currentTimeMillis();
                Map cps = null;
                GitClient client = null;
                try {
                    client = Git.getInstance().getClient(repository);
                    GitRevisionInfo lms = client.log(historyRevision, pm);
                    assert lms != null;
                    cps = lms.getModifiedFiles();
                } catch (GitException ex) {
                    LOG.log(Level.INFO, null, ex);
                } finally {
                    if (client != null) {
                        client.release();
                    }
                }
                if (cps == null) {
                    changePaths = Collections.emptyList();
                } else {
                    changePaths = new ArrayList(cps.values());
                }
                fileChangesets.put(historyRevision, changePaths);
                if(LOG.isLoggable(Level.FINE)) {
                    LOG.log(Level.FINE, " loading changePaths for {0} took {1}", new Object[]{historyRevision, System.currentTimeMillis() - t1}); // NOI18N
                }
            }
            if(changePaths != null) {
                for (GitFileInfo cp : changePaths) {
                    String copy = cp.getOriginalPath();
                    if (copy != null && historyPath.equals(cp.getRelativePath())) {
                        historyPath = copy;
                        break;
                    }
                }
            }
        }
        // XXX check if found path exists in the revision we search for ...
        return pm.isCanceled() ? path : historyPath;
    }
}