/*
 * 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.changelog;

import java.util.Date;

import org.apache.maven.scm.CommandParameter;
import org.apache.maven.scm.CommandParameters;
import org.apache.maven.scm.ScmBranch;
import org.apache.maven.scm.ScmException;
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.provider.ScmProviderRepository;

/**
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 * @author Olivier Lamy
 *
 */
public abstract class AbstractChangeLogCommand extends AbstractCommand implements ChangeLogCommand {
    @Deprecated
    protected abstract ChangeLogScmResult executeChangeLogCommand(
            ScmProviderRepository repository,
            ScmFileSet fileSet,
            Date startDate,
            Date endDate,
            ScmBranch branch,
            String datePattern)
            throws ScmException;

    @Deprecated
    protected ChangeLogScmResult executeChangeLogCommand(
            ScmProviderRepository repository,
            ScmFileSet fileSet,
            ScmVersion startVersion,
            ScmVersion endVersion,
            String datePattern)
            throws ScmException {
        throw new ScmException("Unsupported method for this provider.");
    }

    @Deprecated
    protected ChangeLogScmResult executeChangeLogCommand(
            ScmProviderRepository repository, ScmFileSet fileSet, ScmVersion version, String datePattern)
            throws ScmException {
        throw new ScmException("Unsupported method for this provider.");
    }

    /**
     * {@inheritDoc}
     */
    public ScmResult executeCommand(ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters)
            throws ScmException {
        Date startDate = parameters.getDate(CommandParameter.START_DATE, null);

        Date endDate = parameters.getDate(CommandParameter.END_DATE, null);

        int numDays = parameters.getInt(CommandParameter.NUM_DAYS, 0);

        Integer limit = parameters.getInt(CommandParameter.LIMIT, -1);
        if (limit < 1) {
            limit = null;
        }

        ScmBranch branch = (ScmBranch) parameters.getScmVersion(CommandParameter.BRANCH, null);

        ScmVersion version = parameters.getScmVersion(CommandParameter.SCM_VERSION, null);

        ScmVersion startVersion = parameters.getScmVersion(CommandParameter.START_SCM_VERSION, null);

        ScmVersion endVersion = parameters.getScmVersion(CommandParameter.END_SCM_VERSION, null);

        String datePattern = parameters.getString(CommandParameter.CHANGELOG_DATE_PATTERN, null);

        boolean versionOnly = startVersion == null && endVersion == null && version != null;

        if (versionOnly) {
            return executeChangeLogCommand(repository, fileSet, version, datePattern);
        } else if (startVersion != null || endVersion != null) {
            return executeChangeLogCommand(repository, fileSet, startVersion, endVersion, datePattern);
        } else {
            if (numDays != 0 && (startDate != null || endDate != null)) {
                throw new ScmException("Start or end date cannot be set if num days is set.");
            }

            if (endDate != null && startDate == null) {
                throw new ScmException("The end date is set but the start date isn't.");
            }

            if (numDays > 0) {
                @SuppressWarnings("checkstyle:magicnumber")
                int day = 24 * 60 * 60 * 1000;
                startDate = new Date(System.currentTimeMillis() - (long) numDays * day);

                endDate = new Date(System.currentTimeMillis() + (long) day);
            } else if (endDate == null) {
                endDate = new Date();
            }

            return executeChangeLogCommand(repository, fileSet, startDate, endDate, branch, datePattern);
        }
    }

    protected ChangeLogScmResult executeChangeLogCommand(ChangeLogScmRequest request) throws ScmException {
        throw new ScmException("Unsupported method for this provider.");
    }
}
