//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.start;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.FileTime;
import java.util.Locale;

public class FS
{
    public static boolean canReadDirectory(Path path)
    {
        return Files.exists(path) && Files.isDirectory(path) && Files.isReadable(path);
    }

    public static boolean canReadFile(Path path)
    {
        return Files.exists(path) && Files.isRegularFile(path) && Files.isReadable(path);
    }

    public static boolean canWrite(Path path)
    {
        return Files.isWritable(path);
    }

    public static void close(Closeable c)
    {
        if (c == null)
        {
            return;
        }

        try
        {
            c.close();
        }
        catch (IOException ignore)
        {
            /* ignore */
        }
    }

    public static boolean createNewFile(Path path) throws IOException
    {
        Path ret = Files.createFile(path);
        return Files.exists(ret);
    }

    public static boolean ensureDirectoryExists(Path dir) throws IOException
    {
        if (exists(dir))
        {
            // exists already, nothing to do
            return false;
        }
        Files.createDirectories(dir);
        return true;
    }

    public static void ensureDirectoryWritable(Path dir) throws IOException
    {
        if (!Files.exists(dir))
        {
            throw new IOException("Path does not exist: " + dir.toAbsolutePath());
        }
        if (!Files.isDirectory(dir))
        {
            throw new IOException("Directory does not exist: " + dir.toAbsolutePath());
        }
        if (!Files.isWritable(dir))
        {
            throw new IOException("Unable to write to directory: " + dir.toAbsolutePath());
        }
    }

    public static boolean exists(Path path)
    {
        return Files.exists(path);
    }

    public static boolean isValidDirectory(Path path)
    {
        if (!Files.exists(path))
        {
            // doesn't exist, not a valid directory
            return false;
        }

        if (!Files.isDirectory(path))
        {
            // not a directory (as expected)
            StartLog.warn("Not a directory: " + path);
            return false;
        }

        return true;
    }

    public static boolean isXml(String filename)
    {
        return filename.toLowerCase(Locale.ENGLISH).endsWith(".xml");
    }
    
    public static String toRelativePath(File baseDir, File path)
    {
        return baseDir.toURI().relativize(path.toURI()).toASCIIString();
    }
    
    public static boolean isPropertyFile(String filename)
    {
        return filename.toLowerCase(Locale.ENGLISH).endsWith(".properties");
    }
    
    public static String separators(String path)
    {
        StringBuilder ret = new StringBuilder();
        for (char c : path.toCharArray())
        {
            if ((c == '/') || (c == '\\'))
            {
                ret.append(File.separatorChar);
            }
            else
            {
                ret.append(c);
            }
        }
        return ret.toString();
    }

    public static Path toPath(String path)
    {
        return FileSystems.getDefault().getPath(FS.separators(path));
    }

    public static void touch(Path path) throws IOException
    {
        FileTime now = FileTime.fromMillis(System.currentTimeMillis());
        Files.setLastModifiedTime(path,now);
    }

    public static Path toRealPath(Path path) throws IOException
    {
        return path.toRealPath();
    }
}
