/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.ClosedChannelException;
  import java.nio.channels.ReadableByteChannel;
  import java.nio.charset.Charset;
  
  public class ReadableByteChannelMock implements ReadableByteChannel {
  
      private final byte[][] chunks;
  
      private int chunkCount = 0;
  
      private ByteBuffer currentChunk;
      private boolean eof = false;
      private boolean closed = false;
  
      public ReadableByteChannelMock(final String[] strings, final Charset charset) {
          super();
          this.chunks = new byte[strings.length][];
          for (int i = 0; i < strings.length; i++) {
              this.chunks[i] = strings[i].getBytes(charset);
          }
      }
  
      public ReadableByteChannelMock(final byte[]... chunks) {
          super();
          this.chunks = chunks;
      }
  
      private void prepareChunk() {
          if (this.currentChunk == null || !this.currentChunk.hasRemaining()) {
              if (this.chunkCount < this.chunks.length) {
                  final byte[] bytes = this.chunks[this.chunkCount];
                  this.chunkCount++;
                  this.currentChunk = ByteBuffer.wrap(bytes);
              } else {
                  this.eof = true;
              }
          }
      }
  
      @Override
      public int read(final ByteBuffer dst) throws IOException {
          if (this.closed) {
              throw new ClosedChannelException();
          }
          prepareChunk();
          if (this.eof) {
              return -1;
          }
          int i = 0;
          while (dst.hasRemaining() && this.currentChunk.hasRemaining()) {
              dst.put(this.currentChunk.get());
              i++;
          }
          return i;
      }
  
      @Override
      public void close() throws IOException {
          this.closed = true;
      }
  
      @Override
      public boolean isOpen() {
          return !this.closed && !this.eof;
      }
  
  }