package at.gv.egovernment.moa.id.protocols.pvp2x.binding;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.opensaml.common.SAMLObject;
import org.opensaml.common.binding.BasicSAMLMessageContext;
import org.opensaml.common.xml.SAMLConstants;
import org.opensaml.saml2.binding.decoding.HTTPPostDecoder;
import org.opensaml.saml2.binding.encoding.HTTPPostEncoder;
import org.opensaml.saml2.core.RequestAbstractType;
import org.opensaml.saml2.core.Response;
import org.opensaml.saml2.core.StatusResponseType;
import org.opensaml.saml2.metadata.SPSSODescriptor;
import org.opensaml.saml2.metadata.SingleSignOnService;
import org.opensaml.saml2.metadata.impl.SingleSignOnServiceBuilder;
import org.opensaml.ws.message.decoder.MessageDecodingException;
import org.opensaml.ws.message.encoder.MessageEncodingException;
import org.opensaml.ws.transport.http.HttpServletRequestAdapter;
import org.opensaml.ws.transport.http.HttpServletResponseAdapter;
import org.opensaml.xml.parse.BasicParserPool;
import org.opensaml.xml.security.SecurityException;
import org.opensaml.xml.security.credential.Credential;

import at.gv.egovernment.moa.id.protocols.pvp2x.metadata.MOAMetadataProvider;
import at.gv.egovernment.moa.id.protocols.pvp2x.signer.CredentialProvider;
import at.gv.egovernment.moa.id.protocols.pvp2x.signer.CredentialsNotAvailableException;
import at.gv.egovernment.moa.logging.Logger;

public class PostBinding implements IDecoder, IEncoder {

	public void encodeRequest(HttpServletRequest req, HttpServletResponse resp,
			RequestAbstractType request, String targetLocation)
			throws MessageEncodingException, SecurityException {
		// TODO Auto-generated method stub

	}

	public void encodeRespone(HttpServletRequest req, HttpServletResponse resp,
			StatusResponseType response, String targetLocation)
			throws MessageEncodingException, SecurityException {

		try {
			Credential credentials = CredentialProvider
					.getIDPAssertionSigningCredential();

			Logger.debug("create SAML POSTBinding response");
			
			// VelocityEngine engine =
			// VelocityProvider.getClassPathVelocityEngine();
			VelocityEngine engine = new VelocityEngine();
			engine.setProperty(RuntimeConstants.ENCODING_DEFAULT, "UTF-8");
			engine.setProperty(RuntimeConstants.OUTPUT_ENCODING, "UTF-8");
			engine.setProperty(RuntimeConstants.ENCODING_DEFAULT, "UTF-8");
			engine.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
			engine.setProperty("classpath.resource.loader.class",
					"org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
			engine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
					"org.apache.velocity.runtime.log.SimpleLog4JLogSystem");
			engine.init();

			HTTPPostEncoder encoder = new HTTPPostEncoder(engine,
					"resources/templates/pvp_postbinding_template.html");
			HttpServletResponseAdapter responseAdapter = new HttpServletResponseAdapter(
					resp, true);
			BasicSAMLMessageContext<SAMLObject, SAMLObject, SAMLObject> context = new BasicSAMLMessageContext<SAMLObject, SAMLObject, SAMLObject>();
			SingleSignOnService service = new SingleSignOnServiceBuilder()
					.buildObject();
			service.setBinding(SAMLConstants.SAML2_POST_BINDING_URI);
			service.setLocation(targetLocation);
			context.setOutboundSAMLMessageSigningCredential(credentials);			
			context.setPeerEntityEndpoint(service);
			// context.setOutboundMessage(authReq);
			context.setOutboundSAMLMessage(response);
			context.setOutboundMessageTransport(responseAdapter);

			encoder.encode(context);
		} catch (CredentialsNotAvailableException e) {
			e.printStackTrace();
			throw new SecurityException(e);
		} catch (Exception e) {
			e.printStackTrace();
			throw new SecurityException(e);
		}
	}

	public MOARequest decodeRequest(HttpServletRequest req,
			HttpServletResponse resp) throws MessageDecodingException,
			SecurityException {

		HTTPPostDecoder decode = new HTTPPostDecoder(new BasicParserPool());
		BasicSAMLMessageContext<RequestAbstractType, ?, ?> messageContext = new BasicSAMLMessageContext<RequestAbstractType, SAMLObject, SAMLObject>();
		messageContext
				.setInboundMessageTransport(new HttpServletRequestAdapter(req));
		decode.setURIComparator(new MOAURICompare());
		messageContext.setPeerEntityRole(SPSSODescriptor.DEFAULT_ELEMENT_NAME);

		messageContext.setMetadataProvider(MOAMetadataProvider.getInstance());

		decode.decode(messageContext);

		RequestAbstractType inboundMessage = (RequestAbstractType) messageContext
				.getInboundMessage();
		
		MOARequest request = new MOARequest(inboundMessage);
		request.setVerified(false);
		request.setEntityMetadata(messageContext.getPeerEntityMetadata());
		return request;

	}

	public MOAResponse decodeRespone(HttpServletRequest req,
			HttpServletResponse resp) throws MessageDecodingException,
			SecurityException {

		HTTPPostDecoder decode = new HTTPPostDecoder(new BasicParserPool());
		BasicSAMLMessageContext<Response, ?, ?> messageContext = new BasicSAMLMessageContext<Response, SAMLObject, SAMLObject>();
		messageContext
				.setInboundMessageTransport(new HttpServletRequestAdapter(req));

		messageContext.setPeerEntityRole(SPSSODescriptor.DEFAULT_ELEMENT_NAME);

		decode.decode(messageContext);

		Response inboundMessage = (Response) messageContext.getInboundMessage();

		MOAResponse moaResponse = new MOAResponse(inboundMessage);
		moaResponse.setVerified(false);
		moaResponse.setEntityMetadata(messageContext.getPeerEntityMetadata());
		return moaResponse;

	}

	public boolean handleDecode(String action, HttpServletRequest req) {
		return (req.getMethod().equals("POST"));
	}
}