/*
 * 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.hg.command.diff;

import org.apache.commons.lang3.StringUtils;
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.Command;
import org.apache.maven.scm.command.diff.AbstractDiffCommand;
import org.apache.maven.scm.command.diff.DiffScmResult;
import org.apache.maven.scm.provider.ScmProviderRepository;
import org.apache.maven.scm.provider.hg.HgUtils;
import org.apache.maven.scm.provider.hg.command.HgCommandConstants;

/**
 * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
 */
public class HgDiffCommand extends AbstractDiffCommand implements Command {
    /**
     * {@inheritDoc}
     */
    protected DiffScmResult executeDiffCommand(
            ScmProviderRepository repo, ScmFileSet fileSet, ScmVersion startRevision, ScmVersion endRevision)
            throws ScmException {
        String[] diffCmd;
        if (startRevision != null && !StringUtils.isEmpty(startRevision.getName())) {
            String revArg = startRevision.getName();
            if (endRevision != null && !StringUtils.isEmpty(endRevision.getName())) {
                revArg += ".." + endRevision;
            }
            diffCmd = new String[] {HgCommandConstants.DIFF_CMD, HgCommandConstants.REVISION_OPTION, revArg};
        } else {
            diffCmd = new String[] {HgCommandConstants.DIFF_CMD};
        }

        diffCmd = HgUtils.expandCommandLine(diffCmd, fileSet);
        HgDiffConsumer consumer = new HgDiffConsumer(fileSet.getBasedir());

        ScmResult result = HgUtils.execute(consumer, fileSet.getBasedir(), diffCmd);

        return new DiffScmResult(consumer.getChangedFiles(), consumer.getDifferences(), consumer.getPatch(), result);
    }
}
