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/*
 * Copyright 2011-2024 GatlingCorp (https://gatling.io)
 *
 * 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 io.gatling.http.client.body.multipart.impl;

import static io.gatling.http.client.util.MiscUtils.*;

import io.gatling.http.client.body.multipart.FilePart;
import io.netty.buffer.ByteBuf;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;

public final class FilePartImpl extends FileLikePartImpl {

  private final File file;
  private FileChannel channel;
  private long position = 0L;

  public FilePartImpl(FilePart part, byte[] boundary) {
    super(part, boundary);
    file = part.getContent();
  }

  private FileChannel getChannel() throws IOException {
    if (channel == null) {
      channel = new RandomAccessFile(file, "r").getChannel();
    }
    return channel;
  }

  @Override
  protected long getContentLength() {
    return file.length();
  }

  @Override
  protected void copyContentInto(ByteBuf target) throws IOException {
    // can return -1 if file is empty or FileChannel was closed
    int transferred = target.writeBytes(getChannel(), target.writableBytes());
    if (transferred > 0) {
      position += transferred;
    }
    if (position == file.length() || transferred < 0) {
      state = PartImplState.POST_CONTENT;
      if (channel.isOpen()) {
        channel.close();
      }
    }
  }

  @Override
  public void close() {
    super.close();
    closeSilently(channel);
  }
}