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/**
 * junixsocket
 *
 * Copyright (c) 2009,2014 Christian Kohlschütter
 *
 * The author 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.
 */
package org.newsclub.net.unix;

import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.SocketImpl;
import java.net.SocketOptions;
import java.net.SocketTimeoutException;

/**
 * The Java-part of the {@link AFUNIXSocket} implementation.
 * 
 * @author Christian Kohlschütter
 */
class AFUNIXSocketImpl extends SocketImpl {
  private static final int SHUT_RD = 0;
  private static final int SHUT_WR = 1;
  private static final int SHUT_RD_WR = 2;

  private String socketFile;
  private boolean closed = false;
  private boolean bound = false;
  private boolean connected = false;

  private boolean closedInputStream = false;
  private boolean closedOutputStream = false;

  private final AFUNIXInputStream in = new AFUNIXInputStream();
  private final AFUNIXOutputStream out = new AFUNIXOutputStream();

  AFUNIXSocketImpl() {
    super();
    this.fd = new FileDescriptor();
  }

  FileDescriptor getFD() {
    return fd;
  }

  @Override
  protected void accept(SocketImpl socket) throws IOException {
    final AFUNIXSocketImpl si = (AFUNIXSocketImpl) socket;
    NativeUnixSocket.accept(socketFile, fd, si.fd);
    si.socketFile = socketFile;
    si.connected = true;
  }

  @Override
  protected int available() throws IOException {
    return NativeUnixSocket.available(fd);
  }

  protected void bind(SocketAddress addr) throws IOException {
    bind(0, addr);
  }

  protected void bind(int backlog, SocketAddress addr) throws IOException {
    if (!(addr instanceof AFUNIXSocketAddress)) {
      throw new SocketException("Cannot bind to this type of address: " + addr.getClass());
    }
    final AFUNIXSocketAddress socketAddress = (AFUNIXSocketAddress) addr;
    socketFile = socketAddress.getSocketFile();
    NativeUnixSocket.bind(socketFile, fd, backlog);
    bound = true;
    this.localport = socketAddress.getPort();
  }

  @Override
  @SuppressWarnings("hiding")
  protected void bind(InetAddress host, int port) throws IOException {
    throw new SocketException("Cannot bind to this type of address: " + InetAddress.class);
  }

  @Override
  protected synchronized void close() throws IOException {
    if (closed) {
      return;
    }
    closed = true;
    if (fd.valid()) {
      NativeUnixSocket.shutdown(fd, SHUT_RD_WR);
      NativeUnixSocket.close(fd);
    }
    if (bound) {
      NativeUnixSocket.unlink(socketFile);
    }
    connected = false;
  }

  @Override
  @SuppressWarnings("hiding")
  protected void connect(String host, int port) throws IOException {
    throw new SocketException("Cannot bind to this type of address: " + InetAddress.class);
  }

  @Override
  @SuppressWarnings("hiding")
  protected void connect(InetAddress address, int port) throws IOException {
    throw new SocketException("Cannot bind to this type of address: " + InetAddress.class);
  }

  @Override
  protected void connect(SocketAddress addr, int timeout) throws IOException {
    if (!(addr instanceof AFUNIXSocketAddress)) {
      throw new SocketException("Cannot bind to this type of address: " + addr.getClass());
    }
    final AFUNIXSocketAddress socketAddress = (AFUNIXSocketAddress) addr;
    socketFile = socketAddress.getSocketFile();
    NativeUnixSocket.connect(socketFile, fd);
    this.address = socketAddress.getAddress();
    this.port = socketAddress.getPort();
    this.localport = 0;
    this.connected = true;
  }

  @Override
  protected void create(boolean stream) throws IOException {
  }

  @Override
  protected InputStream getInputStream() throws IOException {
    if (!connected && !bound) {
      throw new IOException("Not connected/not bound");
    }
    return in;
  }

  @Override
  protected OutputStream getOutputStream() throws IOException {
    if (!connected && !bound) {
      throw new IOException("Not connected/not bound");
    }
    return out;
  }

  @Override
  protected void listen(int backlog) throws IOException {
    NativeUnixSocket.listen(fd, backlog);
  }

  @Override
  protected void sendUrgentData(int data) throws IOException {
    NativeUnixSocket.write(fd, new byte[] {(byte) (data & 0xFF)}, 0, 1);
  }

  private final class AFUNIXInputStream extends InputStream {
    private boolean streamClosed = false;

    @Override
    public int read(byte[] buf, int off, int len) throws IOException {
      if (streamClosed) {
        throw new IOException("This InputStream has already been closed.");
      }
      if (len == 0) {
        return 0;
      }
      int maxRead = buf.length - off;
      if (len > maxRead) {
        len = maxRead;
      }
      try {
        return NativeUnixSocket.read(fd, buf, off, len);
      } catch (IOException e) {
        String message = e.getMessage() + " at " + AFUNIXSocketImpl.this.toString();
        if(e instanceof AFUNIXSocketException) {
          Boolean timeout = ((AFUNIXSocketException) e).getTimeout();
          if(timeout != null && timeout) {
            throw new SocketTimeoutException(message);
          }
        }

        throw new IOException(message, e);
      }
    }

    @Override
    public int read() throws IOException {
      final byte[] buf1 = new byte[1];
      final int numRead = read(buf1, 0, 1);
      if (numRead <= 0) {
        return -1;
      } else {
        return buf1[0] & 0xFF;
      }
    }

    @Override
    public void close() throws IOException {
      if (streamClosed) {
        return;
      }
      streamClosed = true;
      if (fd.valid()) {
        NativeUnixSocket.shutdown(fd, SHUT_RD);
      }

      closedInputStream = true;
    }

    @Override
    public int available() throws IOException {
      return NativeUnixSocket.available(fd);
    }
  }

  private final class AFUNIXOutputStream extends OutputStream {
    private boolean streamClosed = false;

    @Override
    public void write(int oneByte) throws IOException {
      final byte[] buf1 = new byte[] {(byte) oneByte};
      write(buf1, 0, 1);
    }

    @Override
    public void write(byte[] buf, int off, int len) throws IOException {
      if (streamClosed) {
        throw new AFUNIXSocketException("This OutputStream has already been closed.");
      }
      if (len > buf.length - off) {
        throw new IndexOutOfBoundsException();
      }
      try {
        while (len > 0 && !Thread.interrupted()) {
          final int written = NativeUnixSocket.write(fd, buf, off, len);
          if (written == -1) {
            throw new IOException("Unspecific error while writing");
          }
          len -= written;
          off += written;
        }
      } catch (final IOException e) {
        throw new IOException(e.getMessage() + " at "
            + AFUNIXSocketImpl.this.toString(), e);
      }
    }

    @Override
    public void close() throws IOException {
      if (streamClosed) {
        return;
      }
      streamClosed = true;
      if (fd.valid()) {
        NativeUnixSocket.shutdown(fd, SHUT_WR);
      }
      closedOutputStream = true;
    }
  }

  @Override
  public String toString() {
    return super.toString() + "[fd=" + fd + "; file=" + this.socketFile + "; connected="
        + connected + "; bound=" + bound + "]";
  }

  private static int expectInteger(Object value) throws SocketException {
    try {
      return (Integer) value;
    } catch (final ClassCastException e) {
      throw new AFUNIXSocketException("Unsupported value: " + value, e);
    } catch (final NullPointerException e) {
      throw new AFUNIXSocketException("Value must not be null", e);
    }
  }

  private static int expectBoolean(Object value) throws SocketException {
    try {
      return (Boolean) value ? 1 : 0;
    } catch (final ClassCastException e) {
      throw new AFUNIXSocketException("Unsupported value: " + value, e);
    } catch (final NullPointerException e) {
      throw new AFUNIXSocketException("Value must not be null", e);
    }
  }

  @Override
  public Object getOption(int optID) throws SocketException {
    try {
      switch (optID) {
        case SocketOptions.SO_KEEPALIVE:
        case SocketOptions.TCP_NODELAY:
          return NativeUnixSocket.getSocketOptionInt(fd, optID) != 0;
        case SocketOptions.SO_LINGER:
        case SocketOptions.SO_TIMEOUT:
        case SocketOptions.SO_RCVBUF:
        case SocketOptions.SO_SNDBUF:
          return NativeUnixSocket.getSocketOptionInt(fd, optID);
        default:
          throw new AFUNIXSocketException("Unsupported option: " + optID);
      }
    } catch (final AFUNIXSocketException e) {
      throw e;
    } catch (final Exception e) {
      throw new AFUNIXSocketException("Error while getting option", e);
    }
  }

  @Override
  public void setOption(int optID, Object value) throws SocketException {
    try {
      switch (optID) {
        case SocketOptions.SO_LINGER:

          if (value instanceof Boolean) {
            final boolean b = (Boolean) value;
            if (b) {
              throw new SocketException("Only accepting Boolean.FALSE here");
            }
            NativeUnixSocket.setSocketOptionInt(fd, optID, -1);
            return;
          }
          NativeUnixSocket.setSocketOptionInt(fd, optID, expectInteger(value));
          return;
        case SocketOptions.SO_RCVBUF:
        case SocketOptions.SO_SNDBUF:
        case SocketOptions.SO_TIMEOUT:
          NativeUnixSocket.setSocketOptionInt(fd, optID, expectInteger(value));
          return;
        case SocketOptions.SO_KEEPALIVE:
        case SocketOptions.TCP_NODELAY:
          NativeUnixSocket.setSocketOptionInt(fd, optID, expectBoolean(value));
          return;
        default:
          throw new AFUNIXSocketException("Unsupported option: " + optID);
      }
    } catch (final AFUNIXSocketException e) {
      throw e;
    } catch (final Exception e) {
      throw new AFUNIXSocketException("Error while setting option", e);
    }
  }

  @Override
  protected void shutdownInput() throws IOException {
    if (!closed && fd.valid()) {
      NativeUnixSocket.shutdown(fd, SHUT_RD);
    }
  }

  @Override
  protected void shutdownOutput() throws IOException {
    if (!closed && fd.valid()) {
      NativeUnixSocket.shutdown(fd, SHUT_WR);
    }
  }

  /**
   * Changes the behavior to be somewhat lenient with respect to the specification.
   * 
   * In particular, we ignore calls to {@link Socket#getTcpNoDelay()} and
   * {@link Socket#setTcpNoDelay(boolean)}.
   */
  static class Lenient extends AFUNIXSocketImpl {
    Lenient() {
      super();
    }

    @Override
    public void setOption(int optID, Object value) throws SocketException {
      try {
        super.setOption(optID, value);
      } catch (SocketException e) {
        switch (optID) {
          case SocketOptions.TCP_NODELAY:
            return;
          default:
            throw e;
        }
      }
    }

    @Override
    public Object getOption(int optID) throws SocketException {
      try {
        return super.getOption(optID);
      } catch (SocketException e) {
        switch (optID) {
          case SocketOptions.TCP_NODELAY:
          case SocketOptions.SO_KEEPALIVE:
            return false;
          default:
            throw e;
        }
      }
    }
  }
}