/*
 * 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.command.update;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.maven.scm.ChangeSet;
import org.apache.maven.scm.CommandParameter;
import org.apache.maven.scm.CommandParameters;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFile;
import org.apache.maven.scm.ScmFileSet;
import org.apache.maven.scm.ScmResult;
import org.apache.maven.scm.ScmVersion;
import org.apache.maven.scm.command.AbstractCommand;
import org.apache.maven.scm.command.changelog.ChangeLogCommand;
import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
import org.apache.maven.scm.command.changelog.ChangeLogSet;
import org.apache.maven.scm.provider.ScmProviderRepository;

/**
 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse </a>
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 *
 */
public abstract class AbstractUpdateCommand extends AbstractCommand {
    protected abstract UpdateScmResult executeUpdateCommand(
            ScmProviderRepository repository, ScmFileSet fileSet, ScmVersion scmVersion) throws ScmException;

    /** {@inheritDoc} */
    public ScmResult executeCommand(ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters)
            throws ScmException {
        ScmVersion scmVersion = parameters.getScmVersion(CommandParameter.SCM_VERSION, null);

        boolean runChangelog = Boolean.valueOf(parameters.getString(CommandParameter.RUN_CHANGELOG_WITH_UPDATE, "true"))
                .booleanValue();

        UpdateScmResult updateScmResult = executeUpdateCommand(repository, fileSet, scmVersion);

        List<ScmFile> filesList = updateScmResult.getUpdatedFiles();

        if (!runChangelog) {
            return updateScmResult;
        }

        ChangeLogCommand changeLogCmd = getChangeLogCommand();

        if (filesList != null && filesList.size() > 0 && changeLogCmd != null) {
            ChangeLogScmResult changeLogScmResult =
                    (ChangeLogScmResult) changeLogCmd.executeCommand(repository, fileSet, parameters);

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

            ChangeLogSet changeLogSet = changeLogScmResult.getChangeLog();

            if (changeLogSet != null) {
                Date startDate = null;

                try {
                    startDate = parameters.getDate(CommandParameter.START_DATE);
                } catch (ScmException e) {
                    // Do nothing, startDate isn't define.
                }

                for (ChangeSet change : changeLogSet.getChangeSets()) {
                    if (startDate != null && change.getDate() != null) {
                        if (startDate.after(change.getDate())) {
                            continue;
                        }
                    }

                    for (ScmFile currentFile : filesList) {
                        if (change.containsFilename(currentFile.getPath())) {
                            changes.add(change);

                            break;
                        }
                    }
                }
            }

            updateScmResult.setChanges(changes);
        }

        return updateScmResult;
    }

    protected abstract ChangeLogCommand getChangeLogCommand();
}
