/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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.apache.cxf.ws.security.policy.builders;

import java.util.Iterator;
import java.util.List;

import javax.xml.namespace.QName;

import org.w3c.dom.Element;

import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.ws.policy.PolicyBuilder;
import org.apache.cxf.ws.policy.PolicyConstants;
import org.apache.cxf.ws.security.policy.SP11Constants;
import org.apache.cxf.ws.security.policy.SP12Constants;
import org.apache.cxf.ws.security.policy.SPConstants;
import org.apache.cxf.ws.security.policy.model.X509Token;
import org.apache.neethi.Assertion;
import org.apache.neethi.AssertionBuilderFactory;
import org.apache.neethi.Policy;
import org.apache.neethi.builders.AssertionBuilder;

public class X509TokenBuilder implements AssertionBuilder<Element> {
    
    PolicyBuilder builder;
    public X509TokenBuilder(PolicyBuilder b) {
        builder = b;
    }

    public Assertion build(Element element, AssertionBuilderFactory factory)
        throws IllegalArgumentException {
        
        SPConstants consts = SP11Constants.SP_NS.equals(element.getNamespaceURI())
            ? SP11Constants.INSTANCE : SP12Constants.INSTANCE;
        X509Token x509Token = new X509Token(consts);
        x509Token.setOptional(PolicyConstants.isOptional(element));
        x509Token.setIgnorable(PolicyConstants.isIgnorable(element));

        Element policyElement = DOMUtils.getFirstElement(element);
        if (policyElement == null && consts != SP11Constants.INSTANCE) {
            throw new IllegalArgumentException(
                "sp:X509Token/wsp:Policy must have a value"
            );
        }

        // Process token inclusion
        String includeAttr = DOMUtils.getAttribute(element, consts.getIncludeToken());

        if (includeAttr != null) {
            SPConstants.IncludeTokenType inclusion 
                = consts.getInclusionFromAttributeValue(includeAttr);
            x509Token.setInclusion(inclusion);
        }

        if (policyElement != null) {
            x509Token.setPolicy(policyElement);
            if (DOMUtils.getFirstChildWithName(policyElement, consts.getRequiredDerivedKeys()) != null) {
                x509Token.setDerivedKeys(true);
            } else if (DOMUtils.getFirstChildWithName(policyElement, 
                    SP12Constants.REQUIRE_IMPLIED_DERIVED_KEYS) != null) {
                x509Token.setImpliedDerivedKeys(true);
            } else if (DOMUtils.getFirstChildWithName(policyElement, 
                    SP12Constants.REQUIRE_EXPLICIT_DERIVED_KEYS) != null) {
                x509Token.setExplicitDerivedKeys(true);
            }
        }

        Policy policy = builder.getPolicy(DOMUtils.getFirstElement(element));
        policy = policy.normalize(builder.getPolicyRegistry(), false);

        for (Iterator<List<Assertion>> iterator = policy.getAlternatives(); iterator.hasNext();) {
            processAlternative(iterator.next(), x509Token, consts);

            /*
             * since there should be only one alternative
             */
            break;
        }
        return x509Token;
    }

    private void processAlternative(List<Assertion> assertions, X509Token parent, SPConstants consts) {
        QName name;

        for (Assertion assertion : assertions) {
            name = assertion.getName();
            
            if (!consts.getNamespace().equals(name.getNamespaceURI())) {
                continue;
            }

            if (SPConstants.REQUIRE_KEY_IDENTIFIER_REFERENCE.equals(name.getLocalPart())) {
                parent.setRequireKeyIdentifierReference(true);

            } else if (SPConstants.REQUIRE_ISSUER_SERIAL_REFERENCE.equals(name.getLocalPart())) {
                parent.setRequireIssuerSerialReference(true);

            } else if (SPConstants.REQUIRE_EMBEDDED_TOKEN_REFERENCE.equals(name.getLocalPart())) {
                parent.setRequireEmbeddedTokenReference(true);

            } else if (SPConstants.REQUIRE_THUMBPRINT_REFERENCE.equals(name.getLocalPart())) {
                parent.setRequireThumbprintReference(true);

            } else if (SPConstants.WSS_X509_V1_TOKEN10.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_V1_TOKEN10);

            } else if (SPConstants.WSS_X509_V1_TOKEN11.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_V1_TOKEN11);

            } else if (SPConstants.WSS_X509_V3_TOKEN10.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_V3_TOKEN10);

            } else if (SPConstants.WSS_X509_V3_TOKEN11.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_V3_TOKEN11);

            } else if (SPConstants.WSS_X509_PKCS7_TOKEN10.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_PKCS7_TOKEN10);

            } else if (SPConstants.WSS_X509_PKCS7_TOKEN11.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_PKCS7_TOKEN11);

            } else if (SPConstants.WSS_X509_PKI_PATH_V1_TOKEN10.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_PKI_PATH_V1_TOKEN10);

            } else if (SPConstants.WSS_X509_PKI_PATH_V1_TOKEN11.equals(name.getLocalPart())) {
                parent.setTokenVersionAndType(SPConstants.WSS_X509_PKI_PATH_V1_TOKEN11);
            }
        }
    }

    public QName[] getKnownElements() {
        return new QName[]{SP11Constants.X509_TOKEN, SP12Constants.X509_TOKEN};
    }

}
