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package org.frameworkset.web.socket.handler;

import java.util.Map;

import javax.servlet.ServletContext;

import org.frameworkset.http.ServerHttpRequest;
import org.frameworkset.http.ServerHttpResponse;
import org.frameworkset.spi.Lifecycle;
import org.frameworkset.util.Assert;
import org.frameworkset.web.servlet.context.ServletContextAware;
import org.frameworkset.web.socket.inf.CloseStatus;
import org.frameworkset.web.socket.inf.WebSocketHandler;
import org.frameworkset.web.socket.sockjs.SockJsException;
import org.frameworkset.web.socket.sockjs.SockJsSession;
import org.frameworkset.web.socket.sockjs.SockJsSessionFactory;
import org.frameworkset.web.socket.sockjs.SockJsTransportFailureException;
import org.frameworkset.web.socket.sockjs.SockJsWebSocketHandler;
import org.frameworkset.web.socket.sockjs.TransportType;
import org.frameworkset.web.socket.sockjs.session.AbstractSockJsSession;
import org.frameworkset.web.socket.sockjs.session.WebSocketServerSockJsSession;

public class WebSocketTransportHandler extends AbstractTransportHandler
		implements SockJsSessionFactory, HandshakeHandler, Lifecycle, ServletContextAware {

	private final HandshakeHandler handshakeHandler;

	private boolean running;

	public WebSocketTransportHandler(HandshakeHandler handshakeHandler) {
		Assert.notNull(handshakeHandler, "handshakeHandler must not be null");
		this.handshakeHandler = handshakeHandler;
	}

	@Override
	public TransportType getTransportType() {
		return TransportType.WEBSOCKET;
	}

	public HandshakeHandler getHandshakeHandler() {
		return this.handshakeHandler;
	}

	@Override
	public void setServletContext(ServletContext servletContext) {
		if (this.handshakeHandler instanceof ServletContextAware) {
			((ServletContextAware) this.handshakeHandler).setServletContext(servletContext);
		}
	}

	@Override
	public boolean isRunning() {
		return this.running;
	}

	@Override
	public void start() {
		if (!isRunning()) {
			this.running = true;
			if (this.handshakeHandler instanceof Lifecycle) {
				((Lifecycle) this.handshakeHandler).start();
			}
		}
	}

	@Override
	public void stop() {
		if (isRunning()) {
			this.running = false;
			if (this.handshakeHandler instanceof Lifecycle) {
				((Lifecycle) this.handshakeHandler).stop();
			}
		}
	}

	@Override
	public AbstractSockJsSession createSession(String id, WebSocketHandler handler, Map attrs) {
		return new WebSocketServerSockJsSession(id, getServiceConfig(), handler, attrs);
	}

	@Override
	public void handleRequest(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler,
			SockJsSession wsSession) throws SockJsException {

		WebSocketServerSockJsSession sockJsSession = (WebSocketServerSockJsSession) wsSession;
		try {
			wsHandler = new SockJsWebSocketHandler(getServiceConfig(), wsHandler, sockJsSession);
			this.handshakeHandler.doHandshake(request, response, wsHandler, sockJsSession.getAttributes());
		} catch (Throwable ex) {
			sockJsSession.tryCloseWithSockJsTransportError(ex, CloseStatus.SERVER_ERROR);
			throw new SockJsTransportFailureException("WebSocket handshake failure", wsSession.getId(), ex);
		}
	}

	@Override
	public boolean doHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler,
			Map attributes) throws HandshakeFailureException {

		return this.handshakeHandler.doHandshake(request, response, handler, attributes);
	}
}