/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.wizards;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import javax.xml.parsers.DocumentBuilderFactory;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.Preferences;
import org.eclipse.jface.util.Assert;
import org.eclipse.wst.common.contentmodel.CMDocument;
import org.eclipse.wst.common.contentmodel.CMElementDeclaration;
import org.eclipse.wst.common.contentmodel.CMNamedNodeMap;
import org.eclipse.wst.common.contentmodel.CMPlugin;
import org.eclipse.wst.common.contentmodel.util.ContentBuilder;
import org.eclipse.wst.common.contentmodel.util.DOMContentBuilderImpl;
import org.eclipse.wst.common.contentmodel.util.DOMWriter;
import org.eclipse.wst.common.contentmodel.util.NamespaceInfo;
import org.eclipse.wst.sse.core.preferences.CommonModelPreferenceNames;
import org.eclipse.wst.xml.core.internal.XMLCorePlugin;
import org.eclipse.wst.xml.uriresolver.XMLCatalog;
import org.eclipse.wst.xml.uriresolver.XMLCatalogEntry;
import org.eclipse.wst.xml.uriresolver.XMLCatalogPlugin;
import org.eclipse.wst.xml.uriresolver.util.IdResolver;
import org.eclipse.wst.xml.uriresolver.util.IdResolverImpl;
import org.eclipse.wst.xml.uriresolver.util.URIHelper;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class NewXMLGenerator
{                                  

  protected String grammarURI;  
  protected CMDocument cmDocument;  
  protected int buildPolicy;
  protected String rootElementName;

  protected XMLCatalogEntry xmlCatalogEntry;
  
  // info for dtd   
  protected String publicId;
  protected String systemId;  
  protected String defaultSystemId;  
                           
  // info for xsd
  public List namespaceInfoList;

  public NewXMLGenerator() 
  {
  }

  public NewXMLGenerator(String grammarURI, CMDocument cmDocument) 
  {
    this.grammarURI = grammarURI;
    this.cmDocument = cmDocument;
  }


  public static CMDocument createCMDocument(String uri, String[] errorInfo)
  {                          
    String title = null;
    String message = null;   
    List errorList = new Vector();
    CMDocument cmDocument = null;

    if (URIHelper.isReadableURI(uri,true))
    {
      uri = URIHelper.normalize(uri, null, null); 
      cmDocument = CMPlugin.getInstance().createCMDocument(uri, null);

      if (uri.endsWith(".dtd"))
      {
        if (errorList.size() > 0)
        {                 
          title = XMLWizard.getString("_UI_INVALID_GRAMMAR_ERROR");
          message = XMLWizard.getString("_UI_LABEL_ERROR_DTD_INVALID_INFO");
        }
      }
      else // ".xsd"
      {
        // To be consistent with the schema editor validation
        XMLSchemaValidationChecker validator = new XMLSchemaValidationChecker();
        if (!validator.isValid(uri))
        {
          title = XMLWizard.getString("_UI_INVALID_GRAMMAR_ERROR");
          message = XMLWizard.getString("_UI_LABEL_ERROR_SCHEMA_INVALID_INFO");
        }
        else if (cmDocument != null)
        {             
          int globalElementCount = cmDocument.getElements().getLength();
          if (globalElementCount == 0)
          {      
            title = XMLWizard.getString("_UI_WARNING_TITLE_NO_ROOT_ELEMENTS");
            message=XMLWizard.getString("_UI_WARNING_MSG_NO_ROOT_ELEMENTS");
          }
        }
      }
    }
    else
    {
      title = XMLWizard.getString("_UI_WARNING_TITLE_NO_ROOT_ELEMENTS");
      message = 
        XMLWizard.getString("_UI_WARNING_URI_NOT_FOUND_COLON")
        + " "
        + uri;
    }
    errorInfo[0] = title;                                     
    errorInfo[1] = message;

    return cmDocument;
  }


  public void createEmptyXMLDocument(IFile newFile) throws Exception
  {                                                                                       
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    Preferences preference = XMLCorePlugin.getDefault().getPluginPreferences();
	String charSet = preference.getString(CommonModelPreferenceNames.OUTPUT_CODESET);	
	
    PrintWriter writer = new PrintWriter(new OutputStreamWriter(outputStream, charSet));
    writer.println("<?xml version=\"1.0\" encoding=\"" + charSet + "\"?>");
    writer.flush();
    outputStream.close(); 

    ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray()); 
    newFile.setContents(inputStream, true, true, null);  
    inputStream.close(); 
  } 
  
  public void createXMLDocument(String xmlFileName) throws Exception
  {
    ByteArrayOutputStream outputStream = createXMLDocument(xmlFileName, false);

    File file = new File(xmlFileName);
    FileOutputStream fos = new FileOutputStream(file);
    outputStream.writeTo(fos);
    fos.close();
  }


  public void createXMLDocument(IFile newFile, String xmlFileName) throws Exception
  {
    ByteArrayOutputStream outputStream = createXMLDocument(xmlFileName, false);

    ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray()); 
    newFile.setContents(inputStream, true, true, null);  
    inputStream.close();
  }


  public ByteArrayOutputStream createXMLDocument(String xmlFileName, boolean junk) throws Exception
  {
    CMDocument cmDocument = getCMDocument();
    
    Assert.isNotNull(cmDocument);
    Assert.isNotNull(getRootElementName());
    
    // create the xml model
    CMNamedNodeMap nameNodeMap = cmDocument.getElements();
    CMElementDeclaration cmElementDeclaration = (CMElementDeclaration)nameNodeMap.getNamedItem(getRootElementName());
    
    Document xmlDocument = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
    DOMContentBuilderImpl contentBuilder = new DOMContentBuilderImpl(xmlDocument);
    
    contentBuilder.setBuildPolicy(buildPolicy);                                                  
    contentBuilder.setExternalCMDocumentSupport(new MyExternalCMDocumentSupport(namespaceInfoList, xmlFileName));
    contentBuilder.uglyTempHack = true; // todo... this line should be removed when 169191 is fixed  
    contentBuilder.createDefaultRootContent(cmDocument, cmElementDeclaration, namespaceInfoList);     
    
    String[] encodingInfo = (String[])cmDocument.getProperty("encodingInfo");
    if (encodingInfo == null)
    {
      encodingInfo = new String[2];
    } 
    
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    OutputStreamWriter outputStreamWriter = encodingInfo[0] != null ? 
                                              new OutputStreamWriter(outputStream, encodingInfo[1]) :
                                              new OutputStreamWriter(outputStream);

    DOMWriter domWriter = new DOMWriter(outputStreamWriter);
    domWriter.print(xmlDocument, encodingInfo[1], cmDocument.getNodeName(), getNonWhitespaceString(getPublicId()), getNonWhitespaceString(getSystemId())); // todo... replace with domWriter.print(xmlDocument); when 169191 is fixed
    outputStream.flush();
    outputStream.close();  
    
    return outputStream;
  }


  public void createNamespaceInfoList()
  {                     
    List result = new Vector();
    XMLCatalog xmlCatalog = XMLCatalogPlugin.getInstance().getDefaultXMLCatalog();
    if (cmDocument != null)
    {  
      result = (List)cmDocument.getProperty("http://org.eclipse.wst/cm/properties/namespaceInfo");
      if (result != null)
      {
        int size = result.size();
        for (int i = 0; i < size; i++)
        {
          NamespaceInfo info = (NamespaceInfo)result.get(i);        
          if (i == 0)
          {                                         
            String locationInfo = null;                            
            if (xmlCatalogEntry != null)
            {                              
              if (xmlCatalogEntry.getType() == XMLCatalogEntry.PUBLIC)
              {
                locationInfo = xmlCatalogEntry.getWebAddress();  
              }
              else
              {
                locationInfo = xmlCatalogEntry.getKey(); 
              }    
            }       
            if (locationInfo == null)
            {
              locationInfo = defaultSystemId; 
            } 
            info.locationHint = locationInfo;    
            info.setProperty("locationHint-readOnly", "true"); 
          }                                                                                
          info.setProperty("uri-readOnly", "true");
          info.setProperty("unremovable", "true");
        }
      }       
                                      
      NamespaceInfoContentBuilder builder = new NamespaceInfoContentBuilder();  
      builder.setBuildPolicy(ContentBuilder.BUILD_ONLY_REQUIRED_CONTENT);
      builder.visitCMNode(cmDocument);  
      result.addAll(builder.list);    
    }                 
    namespaceInfoList = result;
  }  


  public boolean isMissingNamespaceLocation()
  {          
    boolean result = false;
    for (Iterator i = namespaceInfoList.iterator(); i.hasNext(); )
    {
      NamespaceInfo info = (NamespaceInfo)i.next();
      if (info.locationHint == null)
      {
        result = true; 
        break;
      }
    }
    return result;
  }


  public String[] getNamespaceInfoErrors() 
  {
    String[] errorList = null;

    if (namespaceInfoList != null && isMissingNamespaceLocation())
    {
      String title = XMLWizard.getString("_UI_LABEL_NO_LOCATION_HINT");
      String message = XMLWizard.getString("_UI_WARNING_MSG_NO_LOCATION_HINT_1") + " " +
                       XMLWizard.getString("_UI_WARNING_MSG_NO_LOCATION_HINT_2") + "\n\n" + 
                       XMLWizard.getString("_UI_WARNING_MSG_NO_LOCATION_HINT_3");

      errorList = new String[2];
      errorList[0] = title;
      errorList[1] = message;
    }

      return errorList;
  }
  

  public void setXMLCatalogEntry(XMLCatalogEntry catalogEntry) 
  {
    xmlCatalogEntry = catalogEntry;
  }

  public XMLCatalogEntry getXMLCatalogEntry() 
  {
    return xmlCatalogEntry;
  }


  public void setBuildPolicy(int policy) 
  {
    buildPolicy = policy;
  }


  public void setDefaultSystemId(String sysId) 
  {
    defaultSystemId = sysId;
  }
  
  public String getDefaultSystemId() 
  {
    return defaultSystemId;
  }

  public void setSystemId(String sysId) 
  {
    systemId = sysId;
  }
  
  public String getSystemId() 
  {
    return systemId;
  }

  public void setPublicId(String pubId) 
  {
    publicId = pubId;
  }

  public String getPublicId() 
  {
    return publicId;
  }

  public void setGrammarURI(String gramURI) 
  {
    grammarURI = gramURI;
  }

  public String getGrammarURI() 
  {
    return grammarURI;
  }

  public void setCMDocument(CMDocument cmDoc) 
  {
    cmDocument = cmDoc;
  }

  public CMDocument getCMDocument() 
  {
    return cmDocument;
  }

  public void setRootElementName(String rootName) 
  {
    rootElementName = rootName;
  }

  public String getRootElementName() 
  {
    return rootElementName;
  }


  protected class MyExternalCMDocumentSupport implements DOMContentBuilderImpl.ExternalCMDocumentSupport 
  {           
    protected List namespaceInfoList;
    protected IdResolver idResolver;   

    protected MyExternalCMDocumentSupport(List namespaceInfoList, String resourceLocation)
    {
      this.namespaceInfoList = namespaceInfoList;
      idResolver = new IdResolverImpl(resourceLocation);
    }                                            

    public CMDocument getCMDocument(Element element, String namespaceURI)
    {         
      CMDocument result = null;
      if (namespaceURI != null && namespaceURI.trim().length() > 0)
      {
        String locationHint = null; 
        for (Iterator i = namespaceInfoList.iterator(); i.hasNext(); )
        {
          NamespaceInfo info = (NamespaceInfo)i.next();
          if (namespaceURI.equals(info.uri))
          {
            locationHint = info.locationHint;
            break;
          }
        }   
        if (locationHint != null)
        {                     
          grammarURI = idResolver.resolveId(locationHint, locationHint);
          result = CMPlugin.getInstance().createCMDocument(getGrammarURI(), null);
        }
      }   
      else
      {
        result = cmDocument;
      }                                                                      
      return result;
    }       
  }

	public static String getNonWhitespaceString(String string)
	{
		String result = null;
		if (string != null)
		{
			if (string.trim().length() > 0)
			{
				result = string;
			}
		}
		return result;
	}

  
}