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/*
 * Copyright (c) 2014 Spotify AB.
 *
 * 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.spotify.docker.client;

import com.spotify.docker.client.exceptions.DockerException;
import com.spotify.docker.client.exceptions.DockerTimeoutException;
import com.spotify.docker.client.messages.ProgressMessage;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.MappingIterator;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.net.SocketTimeoutException;
import java.net.URI;

import static com.google.common.io.ByteStreams.copy;
import static com.google.common.io.ByteStreams.nullOutputStream;
import static com.spotify.docker.client.ObjectMapperProvider.objectMapper;

class ProgressStream implements Closeable {

  private static final Logger log = LoggerFactory.getLogger(ProgressStream.class);
  private final InputStream stream;
  private final MappingIterator iterator;

  private volatile boolean closed;

  ProgressStream(final InputStream stream) throws IOException {
    this.stream = stream;
    final JsonParser parser = objectMapper().getFactory().createParser(stream);
    iterator = objectMapper().readValues(parser, ProgressMessage.class);
  }

  public boolean hasNextMessage(final String method, final URI uri) throws DockerException {
    try {
      return iterator.hasNextValue();
    } catch (SocketTimeoutException e) {
      throw new DockerTimeoutException(method, uri, e);
    } catch (IOException e) {
      throw new DockerException(e);
    }
  }

  public ProgressMessage nextMessage(final String method, final URI uri) throws DockerException {
    try {
      return iterator.nextValue();
    } catch (SocketTimeoutException e) {
      throw new DockerTimeoutException(method, uri, e);
    } catch (IOException e) {
      throw new DockerException(e);
    }
  }

  public void tail(ProgressHandler handler, final String method, final URI uri)
      throws DockerException {
    while (hasNextMessage(method, uri)) {
      handler.progress(nextMessage(method, uri));
    }
  }

  @Override
  protected void finalize() throws Throwable {
    super.finalize();
    if (!closed) {
      log.warn(this + " not closed properly");
      close();
    }
  }

  @Override
  public void close() throws IOException {
    closed = true;
    // Jersey will close the stream and release the connection after we read all the data.
    // We cannot call the stream's close method because it an instance of UncloseableInputStream,
    // where close is a no-op.
    copy(stream, nullOutputStream());
  }
}