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/*******************************************************************************
 * Copyright (c) 2003, 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.jsp;

import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;

import org.eclipse.jface.text.source.translation.ITagHandler;
import org.eclipse.jface.text.source.translation.ITagHandlerFactory;
import org.eclipse.jface.text.source.translation.ITranslator;

import org.eclipse.jdt.internal.ui.examples.jspeditor.JspTranslatorResultCollector;


public class JspTranslator extends AbstractJspParser implements ITranslator {
  
  private StringBuffer fDeclarations= new StringBuffer();
  private StringBuffer fContent= new StringBuffer();
  private StringBuffer fLocalDeclarations= new StringBuffer();
  
  private ArrayList fContentLines= new ArrayList();
  private ArrayList fDeclarationLines= new ArrayList();
  private ArrayList fLocalDeclarationLines= new ArrayList();
  private int[] fSmap;
  
  private ITagHandlerFactory fTagHandlerFactor;
  private ITagHandler fCurrentTagHandler;

  private JspTranslatorResultCollector fResultCollector;
  
  
  public JspTranslator() {
    
    // Links for passing parameters to the tag handlers 
    fResultCollector= new JspTranslatorResultCollector(fDeclarations, fLocalDeclarations, fContent, fDeclarationLines, fLocalDeclarationLines, fContentLines);
  }
    
  protected void startTag(boolean endTag, String name, int startName) {

    fCurrentTagHandler= fTagHandlerFactor.getHandler(name);
  }
  
  protected void tagAttribute(String attrName, String value, int startName, int startValue) {

    if (fCurrentTagHandler != null)
      fCurrentTagHandler.addAttribute(attrName, value, fLines);
  }
  
  protected void endTag(boolean end) {

    if (fCurrentTagHandler != null)
      try  {
        fCurrentTagHandler.processEndTag(fResultCollector, fLines);
      } catch (IOException ex)  {
        ex.printStackTrace();
      }
  }
  
  protected void java(char ch, String java, int line) {

    if (ch == '!')
      fCurrentTagHandler= fTagHandlerFactor.getHandler("<%!"); //$NON-NLS-1$
    else
      fCurrentTagHandler= fTagHandlerFactor.getHandler("<%"); //$NON-NLS-1$

    /*
     * XXX: This is needed because the used parser does not treat
     *      "<%" like every other tag.
     */
    fCurrentTagHandler.addAttribute("source", java, line); //$NON-NLS-1$

    try {
      fCurrentTagHandler.processEndTag(fResultCollector, line);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  
  protected void text(String t, int line) {
    int i= 0;
    StringBuffer out= new StringBuffer();
    while (i < t.length()) {
      char c= t.charAt(i++);
      if (c == '\n') {
        fContent.append("    System.out.println(\"" + out.toString() + "\");  //$NON-NLS-1$\n");  //$NON-NLS-1$//$NON-NLS-2$
        fContentLines.add(new Integer(line++));
        out.setLength(0);
      } else {
        out.append(c);  
      }
    }
    if (out.length() > 0)  {
      fContent.append("    System.out.print(\"" + out.toString() + "\");  //$NON-NLS-1$\n"); //$NON-NLS-1$ //$NON-NLS-2$
      fContentLines.add(new Integer(line));
    }
  }
  
  private void resetTranslator() {
    fDeclarations.setLength(0);
    fContent.setLength(0);
    fLocalDeclarations.setLength(0);
    
    fLocalDeclarationLines.clear();
    fContentLines.clear();
    fDeclarationLines.clear();
    
  }

  public String translate(Reader reader, String name) throws IOException  {

    StringBuffer buffer= new StringBuffer();
    
    resetTranslator();
    parse(reader);

    int lineCount= 2 + fDeclarationLines.size() + 1 + 1 + fLocalDeclarationLines.size() + fContentLines.size() + 3;
    fSmap= new int[lineCount];
    int line= 0;
    fSmap[line++]= 1;

    buffer.append("public class " + name + " {\n\n"); //$NON-NLS-1$ //$NON-NLS-2$
    fSmap[line++]= 1;
    fSmap[line++]= 1;

    buffer.append(fDeclarations.toString() + "\n"); //$NON-NLS-1$
    System.out.println(fDeclarations.toString());
    for (int i= 0; i < fDeclarationLines.size(); i++)  {
      fSmap[line++]= ((Integer)fDeclarationLines.get(i)).intValue();
      System.out.println("" + ((Integer)fDeclarationLines.get(i)).intValue()); //$NON-NLS-1$
    }
    fSmap[line]= fSmap[line - 1] + 1;
    line++;

    buffer.append("  public void out() {\n"); //$NON-NLS-1$
    fSmap[line]= fSmap[line - 1] + 1;
    line++;
    
    if (fLocalDeclarations.length() > 0)  {
      buffer.append(fLocalDeclarations.toString());
      System.out.println(fLocalDeclarations);
      for (int i= 0; i < fLocalDeclarationLines.size(); i++) {
        System.out.println("" + ((Integer)fLocalDeclarationLines.get(i)).intValue()); //$NON-NLS-1$
        fSmap[line++]= ((Integer)fLocalDeclarationLines.get(i)).intValue();
      }
    }
    
    buffer.append(fContent.toString());
    System.out.println(fContent);
    for (int i= 0; i < fContentLines.size(); i++)  {
      fSmap[line++]= ((Integer)fContentLines.get(i)).intValue();
      System.out.println("" + ((Integer)fContentLines.get(i)).intValue()); //$NON-NLS-1$
    }

    buffer.append("  }\n"); //$NON-NLS-1$
    fSmap[line]= fSmap[line - 1];

    line++;
    
    buffer.append("}\n"); //$NON-NLS-1$
    fSmap[line]= fSmap[line - 2];
    
    for (int i= 0; i < fSmap.length; i++)
      System.out.println("" + i + " -> " + fSmap[i]); //$NON-NLS-1$ //$NON-NLS-2$
    
    System.out.println(buffer.toString());
    
    return buffer.toString();
  }
  
  public int[] getLineMapping()  {
    return fSmap;
  }

  /*
   * @see org.eclipse.jface.text.source.ITranslator#setTagHandlerFactory(org.eclipse.jface.text.source.ITagHandlerFactory)
   */
  public void setTagHandlerFactory(ITagHandlerFactory tagHandlerFactory) {
    fTagHandlerFactor= tagHandlerFactory;
  }

  /*
   * @see ITranslator#backTranslateOffsetInLine(String, String, int)
   */
  public int backTranslateOffsetInLine(String originalLine, String translatedLine, int offsetInTranslatedLine, String tag)  {

    ITagHandler handler;
    if (tag != null)
      handler= fTagHandlerFactor.getHandler(tag);
    else
      handler= fTagHandlerFactor.findHandler(originalLine);

    if (handler != null)
      return handler.backTranslateOffsetInLine(originalLine, translatedLine, offsetInTranslatedLine);

    return -1;
  }
}
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