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package org.java_websocket.drafts;

import java.nio.ByteBuffer;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import java.util.Random;

import org.java_websocket.exceptions.InvalidDataException;

import org.java_websocket.exceptions.InvalidHandshakeException;

import org.java_websocket.exceptions.NotSendableException;

import org.java_websocket.framing.CloseFrame;

import org.java_websocket.framing.FrameBuilder;

import org.java_websocket.framing.Framedata;

import org.java_websocket.framing.Framedata.Opcode;

import org.java_websocket.framing.FramedataImpl1;

import org.java_websocket.handshake.ClientHandshake;

import org.java_websocket.handshake.ClientHandshakeBuilder;

import org.java_websocket.handshake.HandshakeBuilder;

import org.java_websocket.handshake.ServerHandshake;

import org.java_websocket.handshake.ServerHandshakeBuilder;

import org.java_websocket.util.Charsetfunctions;

public class Draft_75 extends Draft {

/**

* The byte representing CR, or Carriage Return, or \r

*/

public static final byte CR = (byte) 0x0D;

/**

* The byte representing LF, or Line Feed, or \n

*/

public static final byte LF = (byte) 0x0A;

/**

* The byte representing the beginning of a WebSocket text frame.

*/

public static final byte START_OF_FRAME = (byte) 0x00;

/**

* The byte representing the end of a WebSocket text frame.

*/

public static final byte END_OF_FRAME = (byte) 0xFF;

protected boolean readingState = false;

private boolean inframe = false;

protected List<Framedata> readyframes = new LinkedList<Framedata>();

protected ByteBuffer currentFrame;

private final Random reuseableRandom = new Random();

@Override

public HandshakeState acceptHandshakeAsClient( ClientHandshake request, ServerHandshake response ) {

return request.getFieldValue( "WebSocket-Origin" ).equals( response.getFieldValue( "Origin" ) ) && basicAccept( response ) ? HandshakeState.MATCHED : HandshakeState.NOT_MATCHED;

}

@Override

public HandshakeState acceptHandshakeAsServer( ClientHandshake handshakedata ) {

if( handshakedata.hasFieldValue( "Origin" ) && basicAccept( handshakedata ) ) {

return HandshakeState.MATCHED;

}

return HandshakeState.NOT_MATCHED;

}

@Override

public ByteBuffer createBinaryFrame( Framedata framedata ) {

if( framedata.getOpcode() != Opcode.TEXT ) {

throw new RuntimeException( "only text frames supported" );

}

ByteBuffer pay = framedata.getPayloadData();

ByteBuffer b = ByteBuffer.allocate( pay.remaining() + 2 );

b.put( START_OF_FRAME );

pay.mark();

b.put( pay );

pay.reset();

b.put( END_OF_FRAME );

b.flip();

return b;

}

@Override

public List<Framedata> createFrames( ByteBuffer binary, boolean mask ) {

throw new RuntimeException( "not yet implemented" );

}

@Override

public List<Framedata> createFrames( String text, boolean mask ) {

FrameBuilder frame = new FramedataImpl1();

try {

frame.setPayload( ByteBuffer.wrap( Charsetfunctions.utf8Bytes( text ) ) );

} catch ( InvalidDataException e ) {

throw new NotSendableException( e );

}

frame.setFin( true );

frame.setOptcode( Opcode.TEXT );

frame.setTransferemasked( mask );

return Collections.singletonList( (Framedata) frame );

}

@Override

public ClientHandshakeBuilder postProcessHandshakeRequestAsClient( ClientHandshakeBuilder request ) throws InvalidHandshakeException {

request.put( "Upgrade", "WebSocket" );

request.put( "Connection", "Upgrade" );

if( !request.hasFieldValue( "Origin" ) ) {

request.put( "Origin", "random" + reuseableRandom.nextInt() );

}

return request;

}

@Override

public HandshakeBuilder postProcessHandshakeResponseAsServer( ClientHandshake request, ServerHandshakeBuilder response ) throws InvalidHandshakeException {

response.setHttpStatusMessage( "Web Socket Protocol Handshake" );

response.put( "Upgrade", "WebSocket" );

response.put( "Connection", request.getFieldValue( "Connection" ) ); // to respond to a Connection keep alive

response.put( "WebSocket-Origin", request.getFieldValue( "Origin" ) );

String location = "ws://" + request.getFieldValue( "Host" ) + request.getResourceDescriptor();

response.put( "WebSocket-Location", location );

// TODO handle Sec-WebSocket-Protocol and Set-Cookie

return response;

}

protected List<Framedata> translateRegularFrame( ByteBuffer buffer ) throws InvalidDataException {

while ( buffer.hasRemaining() ) {

byte newestByte = buffer.get();

if( newestByte == START_OF_FRAME ) { // Beginning of Frame

if( readingState )

return null;

readingState = true;

} else if( newestByte == END_OF_FRAME ) { // End of Frame

if( !readingState )

return null;

// currentFrame will be null if END_OF_FRAME was send directly after

// START_OF_FRAME, thus we will send 'null' as the sent message.

if( this.currentFrame != null ) {

currentFrame.flip();

FramedataImpl1 curframe = new FramedataImpl1();

curframe.setPayload( currentFrame );

curframe.setFin( true );

curframe.setOptcode( inframe ? Opcode.CONTINIOUS : Opcode.TEXT );

readyframes.add( curframe );

this.currentFrame = null;

buffer.mark();

}

readingState = false;

inframe = false;

} else if( readingState ) { // Regular frame data, add to current frame buffer //TODO This code is very expensive and slow

if( currentFrame == null ) {

currentFrame = createBuffer();

} else if( !currentFrame.hasRemaining() ) {

currentFrame = increaseBuffer( currentFrame );

}

currentFrame.put( newestByte );

} else {

return null;

}

}

if( readingState ) {

FramedataImpl1 curframe = new FramedataImpl1();

currentFrame.flip();

curframe.setPayload( currentFrame );

curframe.setFin( false );

curframe.setOptcode( inframe ? Opcode.CONTINIOUS : Opcode.TEXT );

inframe = true;

readyframes.add( curframe );

}

List<Framedata> frames = readyframes;

readyframes = new LinkedList<Framedata>();

this.currentFrame = null;

return frames;

}

@Override

public List<Framedata> translateFrame( ByteBuffer buffer ) throws InvalidDataException {

List<Framedata> frames = translateRegularFrame( buffer );

if( frames == null ) {

throw new InvalidDataException( CloseFrame.PROTOCOL_ERROR );

}

return frames;

}

@Override

public void reset() {

readingState = false;

this.currentFrame = null;

}

@Override

public CloseHandshakeType getCloseHandshakeType() {

return CloseHandshakeType.NONE;

}

public ByteBuffer createBuffer() {

return ByteBuffer.allocate( INITIAL_FAMESIZE );

}

public ByteBuffer increaseBuffer( ByteBuffer full ) {

full.flip();

ByteBuffer newbuffer = ByteBuffer.allocate( full.capacity() * 2 );

newbuffer.put( full );

return newbuffer;

}

}