/*
 * 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.apache.maven.scm.provider.local.command.changelog;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.maven.scm.ChangeFile;
import org.apache.maven.scm.ChangeSet;
import org.apache.maven.scm.ScmBranch;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFileSet;
import org.apache.maven.scm.command.changelog.AbstractChangeLogCommand;
import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
import org.apache.maven.scm.command.changelog.ChangeLogSet;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.scm.provider.local.repository.LocalScmProviderRepository;
import org.codehaus.plexus.util.FileUtils;

/**
 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
 * @author Olivier Lamy
 */
public class LocalChangeLogCommand extends AbstractChangeLogCommand {
    /**
     * {@inheritDoc}
     */
    protected ChangeLogScmResult executeChangeLogCommand(
            ScmProviderRepository repository,
            ScmFileSet fileSet,
            Date startDate,
            Date endDate,
            ScmBranch branch,
            String datePattern)
            throws ScmException {
        LocalScmProviderRepository repo = (LocalScmProviderRepository) repository;

        if (branch != null) {
            throw new ScmException("The local scm doesn't support tags.");
        }

        File root = new File(repo.getRoot());

        String module = repo.getModule();

        File source = new File(root, module);

        File baseDestination = fileSet.getBasedir();

        if (!baseDestination.exists()) {
            throw new ScmException("The working directory doesn't exist (" + baseDestination.getAbsolutePath() + ").");
        }

        if (!root.exists()) {
            throw new ScmException("The base directory doesn't exist (" + root.getAbsolutePath() + ").");
        }

        if (!source.exists()) {
            throw new ScmException("The module directory doesn't exist (" + source.getAbsolutePath() + ").");
        }

        List<ChangeSet> changeLogList = new ArrayList<>();

        try {
            File repoRoot = new File(repo.getRoot(), repo.getModule());

            List<File> files = fileSet.getFileList();

            if (files.isEmpty()) {
                files = FileUtils.getFiles(baseDestination, "**", null, false);
            }

            for (File file : files) {

                String path = file.getPath().replace('\\', '/');

                File repoFile = new File(repoRoot, path);

                file = new File(baseDestination, path);

                ChangeSet changeSet = new ChangeSet();

                int chop = repoRoot.getAbsolutePath().length();

                String fileName = "/" + repoFile.getAbsolutePath().substring(chop + 1);

                changeSet.addFile(new ChangeFile(fileName, null));

                if (repoFile.exists()) {
                    long lastModified = repoFile.lastModified();

                    Date modifiedDate = new Date(lastModified);

                    if (startDate != null) {
                        if (startDate.before(modifiedDate) || startDate.equals(modifiedDate)) {
                            if (endDate != null) {
                                if (endDate.after(modifiedDate) || endDate.equals(modifiedDate)) {
                                    // nop
                                } else {
                                    continue;
                                }
                            }
                        } else {
                            continue;
                        }
                    }

                    changeSet.setDate(modifiedDate);

                    changeLogList.add(changeSet);
                } else {
                    // This file is deleted
                    changeLogList.add(changeSet);
                }
            }
        } catch (IOException ex) {
            throw new ScmException("Error while getting change logs.", ex);
        }

        return new ChangeLogScmResult(null, new ChangeLogSet(changeLogList, startDate, endDate));
    }
}
