//
//  ========================================================================
//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.webapp;

import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.Servlet;

import org.eclipse.jetty.util.Loader;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.xml.XmlParser;
import org.xml.sax.InputSource;


/**
 * Descriptor
 *
 * A web descriptor (web.xml/web-defaults.xml/web-overrides.xml).
 */
public class WebDescriptor extends Descriptor
{
    private static final Logger LOG = Log.getLogger(WebDescriptor.class);

    protected static XmlParser _parserSingleton;
    protected MetaDataComplete _metaDataComplete;
    protected int _majorVersion = 3; //default to container version
    protected int _minorVersion = 0;
    protected ArrayList<String> _classNames = new ArrayList<String>();
    protected boolean _distributable;

    protected boolean _isOrdered = false;
    protected List<String> _ordering = new ArrayList<String>();

    @Override
    public void ensureParser() throws ClassNotFoundException
    {
        synchronized (WebDescriptor.class)
        {
            if (_parserSingleton == null)
                _parserSingleton = newParser(isValidating());
        }
        
        if (_parserSingleton.isValidating()==isValidating())
            _parser = _parserSingleton;
        else
            _parser = newParser(isValidating());
    }

    public static XmlParser newParser(boolean validating) throws ClassNotFoundException
    {
        XmlParser xmlParser=new XmlParser(validating)
        {
            boolean mapped=false;
            
            @Override
            protected InputSource resolveEntity(String pid, String sid)
            {
                if (!mapped)
                {
                    mapResources();
                    mapped=true;
                }
                InputSource is = super.resolveEntity(pid,sid);
                return is;
            }
            
            void mapResources()
            {
                //set up cache of DTDs and schemas locally
                URL dtd22=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_2_2.dtd");
                URL dtd23=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_2_3.dtd");
                URL j2ee14xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/j2ee_1_4.xsd");
                URL javaee5=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_5.xsd");
                URL javaee6=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_6.xsd");
                URL javaee7=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_7.xsd");

                URL webapp24xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_2_4.xsd");
                URL webapp25xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_2_5.xsd");
                URL webapp30xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_3_0.xsd");
                URL webapp31xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-app_3_1.xsd");
                
                URL webcommon30xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-common_3_0.xsd");
                URL webcommon31xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-common_3_1.xsd");
            
                URL webfragment30xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-fragment_3_0.xsd");
                URL webfragment31xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/web-fragment_3_1.xsd");
                
                URL schemadtd=Loader.getResource(Servlet.class,"javax/servlet/resources/XMLSchema.dtd");
                URL xmlxsd=Loader.getResource(Servlet.class,"javax/servlet/resources/xml.xsd");
                URL webservice11xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/j2ee_web_services_client_1_1.xsd");
                URL webservice12xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_web_services_client_1_2.xsd");
                URL webservice13xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_web_services_client_1_3.xsd");
                URL webservice14xsd=Loader.getResource(Servlet.class,"javax/servlet/resources/javaee_web_services_client_1_4.xsd");
                URL datatypesdtd=Loader.getResource(Servlet.class,"javax/servlet/resources/datatypes.dtd");
                
                URL jsp20xsd = null;
                URL jsp21xsd = null;
                URL jsp22xsd = null;
                URL jsp23xsd = null;

                try
                {
                    //try both javax/servlet/resources and javax/servlet/jsp/resources to load 
                    jsp20xsd = Loader.getResource(Servlet.class, "javax/servlet/resources/jsp_2_0.xsd");
                    jsp21xsd = Loader.getResource(Servlet.class, "javax/servlet/resources/jsp_2_1.xsd");
                    jsp22xsd = Loader.getResource(Servlet.class, "javax/servlet/resources/jsp_2_2.xsd");
                    jsp23xsd = Loader.getResource(Servlet.class, "javax/servlet/resources/jsp_2_3.xsd");
                }
                catch (Exception e)
                {
                    LOG.ignore(e);
                }
                finally
                {
                    if (jsp20xsd == null) jsp20xsd = Loader.getResource(Servlet.class, "javax/servlet/jsp/resources/jsp_2_0.xsd");
                    if (jsp21xsd == null) jsp21xsd = Loader.getResource(Servlet.class, "javax/servlet/jsp/resources/jsp_2_1.xsd");
                    if (jsp22xsd == null) jsp22xsd = Loader.getResource(Servlet.class, "javax/servlet/jsp/resources/jsp_2_2.xsd");
                    if (jsp23xsd == null) jsp23xsd = Loader.getResource(Servlet.class, "javax/servlet/jsp/resources/jsp_2_3.xsd");
                }
                
                redirectEntity("web-app_2_2.dtd",dtd22);
                redirectEntity("-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN",dtd22);
                redirectEntity("web.dtd",dtd23);
                redirectEntity("web-app_2_3.dtd",dtd23);
                redirectEntity("-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN",dtd23);
                redirectEntity("XMLSchema.dtd",schemadtd);
                redirectEntity("http://www.w3.org/2001/XMLSchema.dtd",schemadtd);
                redirectEntity("-//W3C//DTD XMLSCHEMA 200102//EN",schemadtd);
                redirectEntity("jsp_2_0.xsd",jsp20xsd);
                redirectEntity("http://java.sun.com/xml/ns/j2ee/jsp_2_0.xsd",jsp20xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/jsp_2_1.xsd",jsp21xsd);
                redirectEntity("jsp_2_2.xsd",jsp22xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/jsp_2_2.xsd",jsp22xsd);
                redirectEntity("jsp_2_3.xsd",jsp23xsd);
                redirectEntity("http://xmlns.jcp.org/xml/ns/javaee/jsp_2_3.xsd",jsp23xsd);
                redirectEntity("j2ee_1_4.xsd",j2ee14xsd);
                redirectEntity("http://java.sun.com/xml/ns/j2ee/j2ee_1_4.xsd",j2ee14xsd);
                redirectEntity( "http://java.sun.com/xml/ns/javaee/javaee_5.xsd",javaee5);
                redirectEntity( "http://java.sun.com/xml/ns/javaee/javaee_6.xsd",javaee6);
                redirectEntity( "http://xmlns.jcp.org/xml/ns/javaee/javaee_7.xsd",javaee7);
                redirectEntity("web-app_2_4.xsd",webapp24xsd);
                redirectEntity("http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd",webapp24xsd);
                redirectEntity("web-app_2_5.xsd",webapp25xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd",webapp25xsd);
                redirectEntity("web-app_3_0.xsd",webapp30xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd",webapp30xsd);
                redirectEntity("web-common_3_0.xsd",webcommon30xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/web-common_3_0.xsd",webcommon30xsd);
                redirectEntity("web-fragment_3_0.xsd",webfragment30xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/web-fragment_3_0.xsd",webfragment30xsd);
                redirectEntity("web-app_3_1.xsd",webapp31xsd);
                redirectEntity("http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd",webapp31xsd);
                
                redirectEntity("web-common_3_1.xsd",webcommon30xsd);
                redirectEntity("http://xmlns.jcp.org/xml/ns/javaee/web-common_3_1.xsd",webcommon31xsd);
                redirectEntity("web-fragment_3_1.xsd",webfragment30xsd);
                redirectEntity("http://xmlns.jcp.org/xml/ns/javaee/web-fragment_3_1.xsd",webfragment31xsd);
                redirectEntity("xml.xsd",xmlxsd);
                redirectEntity("http://www.w3.org/2001/xml.xsd",xmlxsd);
                redirectEntity("datatypes.dtd",datatypesdtd);
                redirectEntity("http://www.w3.org/2001/datatypes.dtd",datatypesdtd);
                redirectEntity("j2ee_web_services_client_1_1.xsd",webservice11xsd);
                redirectEntity("http://www.ibm.com/webservices/xsd/j2ee_web_services_client_1_1.xsd",webservice11xsd);
                redirectEntity("javaee_web_services_client_1_2.xsd",webservice12xsd);   
                redirectEntity("http://www.ibm.com/webservices/xsd/javaee_web_services_client_1_2.xsd",webservice12xsd);
                redirectEntity("javaee_web_services_client_1_3.xsd",webservice13xsd);
                redirectEntity("http://java.sun.com/xml/ns/javaee/javaee_web_services_client_1_3.xsd",webservice13xsd);
                redirectEntity("javaee_web_services_client_1_4.xsd",webservice14xsd);
                redirectEntity("http://xmlns.jcp.org/xml/ns/javaee/javaee_web_services_client_1_4.xsd",webservice14xsd);
            }
        };
        
        return xmlParser;
    }


    public WebDescriptor (Resource xml)
    {
        super(xml);
    }

    public void parse ()
    throws Exception
    {
        super.parse();
        processVersion();
        processOrdering();
    }

    public MetaDataComplete getMetaDataComplete()
    {
        return _metaDataComplete;
    }


    public int getMajorVersion ()
    {
        return _majorVersion;
    }

    public int getMinorVersion()
    {
        return _minorVersion;
    }


    public void processVersion ()
    {
        String version = _root.getAttribute("version", "DTD");
        if ("DTD".equals(version))
        {
            _majorVersion = 2;
            _minorVersion = 3;
            String dtd = _parser.getDTD();
            if (dtd != null && dtd.indexOf("web-app_2_2") >= 0)
            {
                _majorVersion = 2;
                _minorVersion = 2;
            }
        }
        else
        {
           int dot = version.indexOf(".");
           if (dot > 0)
           {
               _majorVersion = Integer.parseInt(version.substring(0,dot));
               _minorVersion = Integer.parseInt(version.substring(dot+1));
           }
        }

        if (_majorVersion <= 2 && _minorVersion < 5)
            _metaDataComplete = MetaDataComplete.True; // does not apply before 2.5
        else
        {
            String s = (String)_root.getAttribute("metadata-complete");
            if (s == null)
                _metaDataComplete = MetaDataComplete.NotSet;
            else
                _metaDataComplete = Boolean.valueOf(s).booleanValue()?MetaDataComplete.True:MetaDataComplete.False;
        }

        if (LOG.isDebugEnabled())
            LOG.debug(_xml.toString()+": Calculated metadatacomplete = " + _metaDataComplete + " with version=" + version);
    }

    public void processOrdering ()
    {
        //Process the web.xml's optional <absolute-ordering> element
        XmlParser.Node ordering = _root.get("absolute-ordering");
        if (ordering == null)
           return;

        _isOrdered = true;
        //If an absolute-ordering was already set, then ignore it in favor of this new one
       // _processor.setOrdering(new AbsoluteOrdering());

        Iterator<Object> iter = ordering.iterator();
        XmlParser.Node node = null;
        while (iter.hasNext())
        {
            Object o = iter.next();
            if (!(o instanceof XmlParser.Node)) continue;
            node = (XmlParser.Node) o;

            if (node.getTag().equalsIgnoreCase("others"))
                //((AbsoluteOrdering)_processor.getOrdering()).addOthers();
                _ordering.add("others");
            else if (node.getTag().equalsIgnoreCase("name"))
                //((AbsoluteOrdering)_processor.getOrdering()).add(node.toString(false,true));
                _ordering.add(node.toString(false,true));
        }
    }

    public void addClassName (String className)
    {
        if (!_classNames.contains(className))
            _classNames.add(className);
    }

    public ArrayList<String> getClassNames ()
    {
        return _classNames;
    }

    public void setDistributable (boolean distributable)
    {
        _distributable = distributable;
    }

    public boolean isDistributable()
    {
        return _distributable;
    }

    public void setValidating (boolean validating)
    {
       _validating = validating;
    }
    
    public boolean isValidating ()
    {
       return _validating;
    }

    public boolean isOrdered()
    {
        return _isOrdered;
    }

    public List<String> getOrdering()
    {
        return _ordering;
    }


}