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/*
 * Copyright (c) 1998-2020 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */

package thredds.filesystem;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.OutputStream;
import thredds.inventory.MFile;
import ucar.nc2.util.IO;
import ucar.unidata.io.RandomAccessFile;
import ucar.unidata.util.StringUtil2;
import javax.annotation.concurrent.ThreadSafe;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;

/**
 * Use Java 7 nio Paths
 *
 * @author caron
 * @since 11/16/13
 */

@ThreadSafe
public class MFileOS7 implements MFile {

  /**
   * Make MFileOS7 if file exists, otherwise return null
   * 
   * @param filename full path name
   * @return MFileOS or null
   */
  public static MFileOS7 getExistingFile(String filename) throws IOException {
    if (filename == null)
      return null;
    Path path = Paths.get(filename);
    if (Files.exists(path))
      return new MFileOS7(path);
    return null;
  }

  private final Path path;
  private final BasicFileAttributes attr;
  private Object auxInfo;

  public MFileOS7(Path path) throws IOException {
    this.path = path;
    this.attr = Files.readAttributes(path, BasicFileAttributes.class);
  }

  public MFileOS7(Path path, BasicFileAttributes attr) {
    this.path = path;
    this.attr = attr;
  }

  public MFileOS7(String filename) throws IOException {
    this.path = Paths.get(filename);
    this.attr = Files.readAttributes(path, BasicFileAttributes.class);
  }

  @Override
  public long getLastModified() {
    return attr.lastModifiedTime().toMillis();
  }

  @Override
  public long getLength() {
    return attr.size();
  }

  @Override
  public boolean isDirectory() {
    return attr.isDirectory();
  }

  @Override
  public boolean isReadable() {
    return Files.isReadable(path);
  }

  @Override
  public String getPath() {
    // no microsnot
    return StringUtil2.replace(path.toString(), '\\', "/");
  }

  @Override
  public String getName() {
    return path.getFileName().toString();
  }

  @Override
  public MFile getParent() throws IOException {
    return new MFileOS7(path.getParent());
  }

  @Override
  public int compareTo(MFile o) {
    return getPath().compareTo(o.getPath());
  }

  @Override
  public Object getAuxInfo() {
    return auxInfo;
  }

  @Override
  public void setAuxInfo(Object auxInfo) {
    this.auxInfo = auxInfo;
  }

  @Override
  public String toString() {
    return getPath();
  }

  @Override
  public boolean exists() {
    return Files.exists(path);
  }

  @Override
  public FileInputStream getInputStream() throws FileNotFoundException {
    return new FileInputStream(path.toFile());
  }

  @Override
  public void writeToStream(OutputStream outputStream) throws IOException {
    IO.copyFile(path.toFile(), outputStream);
  }

  @Override
  public void writeToStream(OutputStream outputStream, long offset, long maxBytes) throws IOException {
    try (RandomAccessFile randomAccessFile = RandomAccessFile.acquire(path.toString())) {
      IO.copyRafB(randomAccessFile, offset, maxBytes, outputStream);
    }
  }

  @Override
  public MFileOS7 getChild(String newFilename) {
    throw new UnsupportedOperationException("MFileOS7::getChild not implemented. Filename: " + getName());
  }

  public Path getNioPath() {
    return path;
  }
}