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/*
 * Copyright 2013 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.base.io;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.List;

import org.joda.time.DateTime;

import br.com.objectos.way.base.zip.WayZip;
import br.com.objectos.way.base.zip.WayZipEntry;
import br.com.objectos.way.base.zip.WayZipException;
import br.com.objectos.way.base.zip.WayZips;
import br.com.objectos.core.io.Directory;
import br.com.objectos.core.io.DirectoryFind.Exec;

import com.google.common.collect.ImmutableList;

/**
 * @author [email protected] (Marcio Endo)
 */
public class DataFile extends DataFileMeta {

  private DataFile(Directory directory, String name) {
    super(directory, name);
  }

  private DataFile(File file) {
    super(file);
  }

  public static DataFile at(Directory directory, String name) {
    return new DataFile(directory, name);
  }

  public static DataFile of(File file) {
    return new DataFile(file);
  }

  public static DataFile withExt(Directory directory, String ext) {
    DateTime now = new DateTime();
    String filename = String.format("%s.%s", now.toString("yyyy-MM-dd-hhmmssSSS"), ext);
    return new DataFile(directory, filename);
  }

  public static Exec toDataFileExec() {
    return ToDataFileExec.INSTANCE;
  }

  public DataFileMeta metaOf(String ext) {
    String filename = String.format("%s.%s", name, ext);
    return new DataFileMeta(directory, filename);
  }

  public List unzip() {
    DataFileLog log = DataFileLog.of(this);

    try {
      WayZip zip = WayZips.unzip(file);

      for (WayZipEntry error : zip.getErrors()) {
        log.error("Could not unzip entry %s", error.getIOException(), error.getName());
      }

      return zip.open();

    } catch (WayZipException e) {
      log.error("Could not open as a ZipFile: %s", e, getPath());
      return ImmutableList.of();

    }
  }

  void copyFrom(InputStream is) {
    ReadableByteChannel rbc = Channels.newChannel(is);
    DataFileOutputStream os = toDataFileOutputStream();
    os.transferFrom(rbc);
  }

  private DataFileOutputStream toDataFileOutputStream() {
    try {
      FileOutputStream os = new FileOutputStream(file);
      return DataFileOutputStream.valid(this, os);
    } catch (FileNotFoundException e) {
      return DataFileOutputStream.invalid(this, e);
    }
  }

  private enum ToDataFileExec implements Exec {
    INSTANCE;
    @Override
    public DataFile apply(File file) {
      return new DataFile(file);
    }
  }

}