// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed 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 com.google.gerrit.server.change;

import java.io.Closeable;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.eclipse.jgit.api.ArchiveCommand;
import org.eclipse.jgit.api.ArchiveCommand.Format;
import org.eclipse.jgit.archive.TarFormat;
import org.eclipse.jgit.archive.Tbz2Format;
import org.eclipse.jgit.archive.TgzFormat;
import org.eclipse.jgit.archive.TxzFormat;
import org.eclipse.jgit.archive.ZipFormat;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectLoader;

public enum ArchiveFormat {
  TGZ("application/x-gzip", new TgzFormat()),
  TAR("application/x-tar", new TarFormat()),
  TBZ2("application/x-bzip2", new Tbz2Format()),
  TXZ("application/x-xz", new TxzFormat()),
  ZIP("application/x-zip", new ZipFormat());

  @SuppressWarnings("ImmutableEnumChecker") // ArchiveCommand.Format is effectively immutable.
  private final ArchiveCommand.Format<?> format;

  private final String mimeType;

  ArchiveFormat(String mimeType, ArchiveCommand.Format<?> format) {
    this.format = format;
    this.mimeType = mimeType;
    ArchiveCommand.registerFormat(name(), format);
  }

  public String getShortName() {
    return name().toLowerCase();
  }

  public String getMimeType() {
    return mimeType;
  }

  public String getDefaultSuffix() {
    return getSuffixes().iterator().next();
  }

  public Iterable<String> getSuffixes() {
    return format.suffixes();
  }

  public ArchiveOutputStream createArchiveOutputStream(OutputStream o) throws IOException {
    return (ArchiveOutputStream) this.format.createArchiveOutputStream(o);
  }

  public <T extends Closeable> void putEntry(T out, String path, byte[] data) throws IOException {
    @SuppressWarnings("unchecked")
    ArchiveCommand.Format<T> fmt = (Format<T>) format;
    fmt.putEntry(
        out,
        null,
        path,
        FileMode.REGULAR_FILE,
        new ObjectLoader.SmallObject(FileMode.TYPE_FILE, data));
  }
}