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/**
 * 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.neethi;

import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;

import org.w3c.dom.Element;

import org.apache.neethi.builders.AssertionBuilder;

/**
 * PolicyBuilder provides set of methods to create a Policy object from an
 * InputStream, Element, XMLStreamReader, OMElement, etc.. It maintains an instance of
 * AssertionBuilderFactory that can return AssertionBuilders that can create a
 * Domain Assertion out of an element. These AssertionBuilders are used when
 * constructing a Policy object.
 */
public class PolicyBuilder {

    protected AssertionBuilderFactory factory;
    protected PolicyRegistry defaultPolicyRegistry;
    
    public PolicyBuilder() {
        factory = new AssertionBuilderFactoryImpl(this);
    }
    
    public PolicyBuilder(AssertionBuilderFactory factory) {
        this.factory = factory;
    }
    
    
    /**
     * Registers an AssertionBuilder instances and associates it with a QName.
     * PolicyManager or other AssertionBuilders instances can use this
     * AssertionBuilder instance to process and build an Assertion from a
     * element with the specified QName.
     * 
     * @param qname
     *            the QName of the Assertion that the Builder can build
     * @param builder
     *            the AssertionBuilder that can build assertions that of 'qname'
     *            type
     */
    public void registerBuilder(QName qname, AssertionBuilder builder) {
        factory.registerBuilder(qname, builder);
    }
    
    
    /**
     * The PolicyEngine can have a default PolicyRegistry that the Policy objects
     * that it creates are setup to use when normalize is called without the 
     * PolicyRegistry.   
     * @return the default PolicyRegistry
     */
    public PolicyRegistry getPolicyRegistry() {
        return defaultPolicyRegistry;
    }

    public void setPolicyRegistry(PolicyRegistry reg) {
        defaultPolicyRegistry = reg;
    }
    
    public AssertionBuilderFactory getAssertionBuilderFactory() {
        return factory;
    }

    /**
     * Creates a Policy object from an InputStream.
     * 
     * @param inputStream
     *            the InputStream of the Policy
     * @return a Policy object of the Policy that is fed as a InputStream
     */
    public Policy getPolicy(InputStream inputStream) {
        try {
            XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(inputStream);
            return getPolicy(reader);
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException("Could not load policy.", ex); 
        }
    }

    public Policy getPolicy(Element el) {
        return getPolicyOperator(el);
    }
    
    
    public Policy getPolicy(XMLStreamReader reader) {
        return getPolicyOperator(reader);
    }

    /**
     * Creates a Policy object from an element.
     * 
     * @param element
     *            the Policy element
     * @return a Policy object of the Policy element
     */
    public Policy getPolicy(Object element) {
        return getPolicyOperator(element);
    }

    /**
     * Creates a PolicyReference object.
     * 
     * @param inputStream
     *            the InputStream of the PolicyReference
     * @return a PolicyReference object of the PolicyReference
     */
    public PolicyReference getPolicyReference(InputStream inputStream) {
        try {
            XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(inputStream);
            return getPolicyReference(reader);
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException("Could not load policy reference.", ex); 
        }
    }

    /**
     * Creates a PolicyReference object from an element.
     * 
     * @param element
     *            the PolicyReference element
     * @return a PolicyReference object of the PolicyReference element
     */
    public PolicyReference getPolicyReference(Object element) {
        QName qn = factory.getConverterRegistry().findQName(element);

        if (!Constants.isPolicyRef(qn)) {
            throw new RuntimeException(
                    "Specified element is not a   element");
        }

        PolicyReference reference = new PolicyReference(this);

        Map attributes = factory.getConverterRegistry().getAttributes(element);

        // setting the URI value
        reference.setURI(attributes.get(new QName("URI")));
        return reference;
    }

    private Policy getPolicyOperator(Object element) {
        QName qn = factory.getConverterRegistry().findQName(element);
        
        if (Constants.isPolicyElement(qn)) {
            String ns = qn.getNamespaceURI();
            return (Policy) processOperationElement(element, new Policy(defaultPolicyRegistry, ns));
        }
        throw new IllegalArgumentException(qn + " is not a  element."); 
    }

    private ExactlyOne getExactlyOneOperator(Object element) {
        return (ExactlyOne) processOperationElement(element, new ExactlyOne());
    }

    private All getAllOperator(Object element) {
        return (All) processOperationElement(element, new All());
    }

    private PolicyOperator processOperationElement(Object operationElement,
                                                   PolicyOperator operator) {

        if (Constants.TYPE_POLICY == operator.getType()) {
            Policy policyOperator = (Policy) operator;

            Map attributes = factory.getConverterRegistry().getAttributes(operationElement);
            
            for (Map.Entry ent : attributes.entrySet()) {
                policyOperator.addAttribute(ent.getKey(), ent.getValue());
            }
        }

        for (Iterator iterator = factory.getConverterRegistry().getChildElements(operationElement); 
            iterator.hasNext();) {
            
            Object childElement = iterator.next();
            QName qn = factory.getConverterRegistry().findQName(childElement);
            
            if (childElement == null || qn == null 
                || qn.getNamespaceURI() == null) {
                
                notifyUnknownPolicyElement(childElement);
                
            } else if (Constants.isInPolicyNS(qn)) {
                if (Constants.ELEM_POLICY.equals(qn.getLocalPart())) {
                    operator.addPolicyComponent(getPolicyOperator(childElement));
                } else if (Constants.ELEM_EXACTLYONE.equals(qn.getLocalPart())) {
                    operator.addPolicyComponent(getExactlyOneOperator(childElement));
                } else if (Constants.ELEM_ALL.equals(qn.getLocalPart())) {
                    operator.addPolicyComponent(getAllOperator(childElement));
                } else if (Constants.ELEM_POLICY_REF.equals(qn.getLocalPart())) {
                    operator.addPolicyComponent(getPolicyReference(childElement));
                } else {
                    operator.addPolicyComponent(factory.build(childElement));
                }
            } else {
                operator.addPolicyComponent(factory.build(childElement));
            }
        }
        return operator;
    } 
    
    protected void notifyUnknownPolicyElement(Object childElement) {
        //NO-Op - subclass could log or throw exception or something
    }
}