/*
 * 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.jena.dboe.base.file;

import java.io.File;

import org.apache.jena.atlas.lib.FileOps;
import org.apache.jena.atlas.lib.tuple.Tuple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Naming metadata management to a collection of related files (same directory,
 * same basename within directory, various extensions).
 */
public class FileSet {
    // Cope with "in-memory" fileset (location == null)

    private static Logger log = LoggerFactory.getLogger(FileSet.class);

    private Location      location;
    private String        basename;

    /** FileSet for "in-memory" */
    public static FileSet mem() {
        FileSet fs = new FileSet(Location.mem(), "mem");
        return fs;
    }

    // private FileSet() {} // Uninitialized.

    /**
     * Create a FileSet given Location (directory) and name within the directory
     */
    public FileSet(String directory, String basename) {
        initFileSet(Location.create(directory), basename);
    }

    /**
     * Create a FileSet given Location (directory) and name within the directory
     */
    public FileSet(String filename) {
        Tuple<String> t = FileOps.splitDirFile(filename);
        String dir = t.get(0);
        String fn = t.get(1);
        if ( dir == null )
            dir = ".";
        initFileSet(Location.create(dir), fn);
    }

    /**
     * Create a FileSet given Location (directory) and name within the directory
     */
    public FileSet(Location directory, String basename) {
        initFileSet(directory, basename);
    }

    private void initFileSet(Location directory, String basename) {
        // Default - don't use the locations metadata
        initFileSet(directory, basename, false);
    }

    private void initFileSet(Location directory, String basename, boolean useLocationMetadata) {
        this.location = directory;
        this.basename = basename;
    }

    public Location getLocation() {
        return location;
    }

    public String getBasename() {
        return basename;
    }

    // public MetaFile getMetaFile() { return metafile; }

    public boolean isMem() {
        return location.isMem();
    }

    public boolean exists(String ext) {
        if ( location.isMem() )
            return true;
        String fn = filename(ext);
        File f = new File(fn);
        if ( f.isDirectory() )
            log.warn("File clashes with a directory");
        return f.exists() && f.isFile();
    }

    @Override
    public String toString() {
        return "FileSet:" + filename(null);
    }

    public String filename(String ext) {
        return location.getPath(basename, ext);
    }
}
