/*
 * 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;

import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.codehaus.plexus.util.DirectoryScanner;
import org.codehaus.plexus.util.FileUtils;

/**
 * Set of files used for SCM operations.
 * Consists of the base directory of the files and a list of files relative to that directory.
 *
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
public class ScmFileSet implements Serializable {
    private static final long serialVersionUID = -5978597349974797556L;

    private static final String DELIMITER = ",";

    /**
     * @see DirectoryScanner#DEFAULTEXCLUDES
     */
    private static final String DEFAULT_EXCLUDES = StringUtils.join(DirectoryScanner.DEFAULTEXCLUDES, DELIMITER);

    private final File basedir;

    private String includes;

    private String excludes;

    /**
     * List of File objects, all relative to the basedir.
     */
    private final List<File> files;

    /**
     * Create a file set with no files, only the base directory.
     *
     * @param basedir directory files in the set are relative to
     */
    public ScmFileSet(File basedir) {
        this(basedir, new ArrayList<>(0));
    }

    /**
     * Create a file set with only the file provided, relative to basedir.
     *
     * @param basedir directory file is relative to
     * @param file    file that the set will contain, has to be relative to basedir
     */
    public ScmFileSet(File basedir, File file) {
        this(basedir, new File[] {file});
    }

    /**
     * Create a file set with only files (not directories) from basefile,
     * using includes and excludes provided.
     *
     * @param basedir  directory files are relative to
     * @param includes ant pattern for files to include
     * @param excludes ant pattern for files to exclude,
     *                 if null DEFAULT_EXCLUDES is used, else DEFAULT_EXCLUDES is added
     * @throws IOException if any
     */
    public ScmFileSet(File basedir, String includes, String excludes) throws IOException {
        this.basedir = basedir;

        if (excludes != null && excludes.length() > 0) {
            excludes += DELIMITER + DEFAULT_EXCLUDES;
        } else {
            excludes = DEFAULT_EXCLUDES;
        }
        this.files = FileUtils.getFiles(basedir, includes, excludes, false);
        this.includes = includes;
        this.excludes = excludes;
    }

    /**
     * Create a file set with files from basefile, using includes provided and default excludes.
     *
     * @param basedir  directory files are relative to
     * @param includes ant pattern for files to include
     * @throws IOException if any
     * @since 1.0
     */
    public ScmFileSet(File basedir, String includes) throws IOException {
        this(basedir, includes, null);
    }

    /**
     * Create a file set with the files provided, relative to basedir.
     *
     * @param basedir directory files are relative to
     * @param files   files that the set will contain, have to be relative to basedir
     * @deprecated use ScmFileSet( File, List )
     */
    public ScmFileSet(File basedir, File[] files) {
        this(basedir, Arrays.asList(files));
    }

    /**
     * Create a file set with the files provided, relative to basedir.
     *
     * @param basedir directory files are relative to
     * @param files   list of File objects, files that the set will contain, have to be relative to basedir
     */
    public ScmFileSet(File basedir, List<File> files) {
        if (basedir == null) {
            throw new NullPointerException("basedir must not be null");
        }

        if (files == null) {
            throw new NullPointerException("files must not be null");
        }

        this.basedir = basedir;
        this.files = files;
    }

    /**
     * Get the base directory of the file set. It's the directory files in the set are relative to.
     *
     * @return base directory
     */
    public File getBasedir() {
        return basedir;
    }

    /**
     * Get the list of files in the set, relative to basedir.
     *
     * @return files in this set
     * @deprecated use getFileList() instead
     */
    public File[] getFiles() {
        return this.files.toArray(new File[this.files.size()]);
    }

    /**
     * Get the list of files in the set, relative to basedir.
     *
     * @return list of File objects
     */
    public List<File> getFileList() {
        return this.files;
    }

    /**
     * @return the includes files as a comma separated string
     */
    public String getIncludes() {
        return this.includes;
    }

    /**
     * @return the excludes files as a comma separated string
     */
    public String getExcludes() {
        return this.excludes;
    }

    /**
     * {@inheritDoc}
     */
    public String toString() {
        return "basedir = " + basedir + "; files = " + files;
    }
}