/*
 * 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.plugin;

import javax.inject.Inject;

import java.io.File;
import java.io.IOException;

import org.apache.commons.lang3.StringUtils;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFile;
import org.apache.maven.scm.command.status.StatusScmResult;
import org.apache.maven.scm.manager.ScmManager;
import org.apache.maven.scm.repository.ScmRepository;
import org.apache.maven.settings.crypto.SettingsDecrypter;

/**
 * Display the modification status of the files in the configured scm url.
 *
 * @author <a href="evenisse@apache.org">Emmanuel Venisse</a>
 * @author Olivier Lamy
 */
@Mojo(name = "status", aggregator = true)
public class StatusMojo extends AbstractScmMojo {

    @Inject
    public StatusMojo(ScmManager manager, SettingsDecrypter settingsDecrypter) {
        super(manager, settingsDecrypter);
    }

    /**
     * {@inheritDoc}
     */
    public void execute() throws MojoExecutionException {
        super.execute();

        try {
            ScmRepository repository = getScmRepository();

            StatusScmResult result = getScmManager().status(repository, getFileSet());

            checkResult(result);

            File baseDir = getFileSet().getBasedir();

            // Determine the maximum length of the status column
            int maxLen = 0;

            for (ScmFile file : result.getChangedFiles()) {
                maxLen = Math.max(maxLen, file.getStatus().toString().length());
            }

            for (ScmFile file : result.getChangedFiles()) {
                // right align all of the statuses
                getLog().info(StringUtils.leftPad(file.getStatus().toString(), maxLen) + " status for "
                        + getRelativePath(baseDir, file.getPath()));
            }
        } catch (IOException | ScmException e) {
            throw new MojoExecutionException("Cannot run status command : ", e);
        }
    }

    /**
     * Formats the filename so that it is a relative directory from the base.
     *
     * @param baseDir
     * @param path
     * @return the relative path
     */
    protected String getRelativePath(File baseDir, String path) {
        if (path.equals(baseDir.getAbsolutePath())) {
            return ".";
        } else if (path.indexOf(baseDir.getAbsolutePath()) == 0) {
            // the + 1 gets rid of a leading file separator
            return path.substring(baseDir.getAbsolutePath().length() + 1);
        } else {
            return path;
        }
    }
}
