/***********************************************************************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others. All rights reserved. This program and the accompanying materials are made
 * available under the terms of the Common Public License v1.0 which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 **********************************************************************************************************************************/
package net.sourceforge.phpeclipse.wiki.editor;

import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.RGB;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.contentassist.ContentAssistant;
import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
import org.eclipse.jface.text.contentassist.IContentAssistant;
import org.eclipse.jface.text.presentation.IPresentationReconciler;
import org.eclipse.jface.text.presentation.PresentationReconciler;
import org.eclipse.jface.text.reconciler.IReconciler;
import org.eclipse.jface.text.reconciler.MonoReconciler;
import org.eclipse.jface.text.rules.DefaultDamagerRepairer;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.ITokenScanner;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.RuleBasedScanner;
import org.eclipse.jface.text.rules.SingleLineRule;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.text.rules.WordRule;
import org.eclipse.jface.text.source.IAnnotationHover;
import org.eclipse.jface.text.source.ISharedTextColors;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.SourceViewerConfiguration;

public class WikiSourceViewerConfiguration extends SourceViewerConfiguration {

  /**
   * A no-op implementation of <code>IAnnotationHover</code> that will trigger the text editor to set up annotation hover support.
   */
  private static final class NullHover implements IAnnotationHover {

    /*
     * @see org.eclipse.jface.text.source.IAnnotationHover#getHoverInfo(org.eclipse.jface.text.source.ISourceViewer, int)
     */
    public String getHoverInfo(ISourceViewer sourceViewer, int lineNumber) {
      return null;
    }
  }

  /**
   * Simple word detector that detects any sequence of non-whitespace as a word.
   */
  private static final class SimpleWordDetector implements IWordDetector {
    /*
     * @see org.eclipse.jface.text.rules.IWordDetector#isWordStart(char)
     */
    public boolean isWordStart(char c) {
      return isWordPart(c);
    }

    /*
     * @see org.eclipse.jface.text.rules.IWordDetector#isWordPart(char)
     */
    public boolean isWordPart(char c) {
      return !Character.isWhitespace(c);
    }
  }

  private static final class SimpleListDetector implements IWordDetector {
    /*
     * @see org.eclipse.jface.text.rules.IWordDetector#isWordStart(char)
     */
    public boolean isWordStart(char c) {
      return c == '*' || c == '#';
    }

    /*
     * @see org.eclipse.jface.text.rules.IWordDetector#isWordPart(char)
     */
    public boolean isWordPart(char c) {
      return true;
    }
  }

  private final ISharedTextColors fColors;

  private WikiEditor fEditor;

  public WikiSourceViewerConfiguration(WikiEditor editor, ISharedTextColors colors) {
    fEditor = editor;
    fColors = colors;
  }

  /*
   * @see org.eclipse.jface.text.source.SourceViewerConfiguration#getPresentationReconciler(org.eclipse.jface.text.source.ISourceViewer)
   */
  public IPresentationReconciler getPresentationReconciler(ISourceViewer sourceViewer) {
    PresentationReconciler reconciler = new PresentationReconciler();
    DefaultDamagerRepairer dr = new DefaultDamagerRepairer(getRecipeScanner());
    reconciler.setDamager(dr, IDocument.DEFAULT_CONTENT_TYPE);
    reconciler.setRepairer(dr, IDocument.DEFAULT_CONTENT_TYPE);
    return reconciler;
  }

  private ITokenScanner getRecipeScanner() {
    RuleBasedScanner scanner = new RuleBasedScanner();

    IRule[] rules = new IRule[11];
    rules[0] = createHeader6Rule();
    rules[1] = createHeader5Rule();
    rules[2] = createHeader4Rule();
    rules[3] = createHeader3Rule();
    rules[4] = createHeader2Rule();
    rules[5] = createHeader1Rule();
    rules[6] = createHRRule();
    rules[7] = createLinkRule();
    rules[8] = createExternalHTTPRule();
    rules[9] = createListRule();
    rules[10] = createNumberedListRule();

    scanner.setRules(rules);
    return scanner;
  }

  //	private IRule createSectionTitleRule() {
  //		IToken titleToken= new Token(new TextAttribute(null, null, SWT.BOLD));
  //		WordRule wordRule= new WordRule(new SimpleWordDetector());
  //		wordRule.addWord(IngredientsSection.TITLE + ":", titleToken);
  //		wordRule.addWord(PreparationSection.TITLE + ":", titleToken);
  //		return wordRule;
  //	}

  private IRule createHRRule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("----", "\n", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader1Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("=", "=", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader2Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("==", "==", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader3Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("===", "===", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader4Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("====", "====", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader5Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("=====", "=====", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createHeader6Rule() {
    IToken quantityToken = new Token(new TextAttribute(fColors.getColor(new RGB(0, 0, 140)), null, SWT.ITALIC));
    SingleLineRule singleLineRule = new SingleLineRule("======", "======", quantityToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  //	private IRule createLeadingDashRule() {
  //		IToken dashToken= new Token(new TextAttribute(fColors.getColor(new RGB(200, 100, 100)), null, SWT.BOLD));
  //		WordRule wordRule= new WordRule(new SimpleWordDetector());
  //		wordRule.addWord("-", dashToken);
  //		wordRule.setColumnConstraint(0);
  //		return wordRule;
  //	}

  private IRule createListRule() {
    IToken dashToken = new Token(new TextAttribute(fColors.getColor(new RGB(63, 127, 95)), null, SWT.BOLD));
    //		WordRule wordRule= new WordRule(new SimpleListDetector());
    //		wordRule.addWord("*", dashToken);
    SingleLineRule singleLineRule = new SingleLineRule("*", "\n", dashToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createNumberedListRule() {
    IToken dashToken = new Token(new TextAttribute(fColors.getColor(new RGB(63, 127, 95)), null, SWT.BOLD));
    //		WordRule wordRule= new WordRule(new SimpleListDetector());
    //		wordRule.addWord("#", dashToken);
    SingleLineRule singleLineRule = new SingleLineRule("#", "\n", dashToken);
    singleLineRule.setColumnConstraint(0);
    return singleLineRule;
  }

  private IRule createLinkRule() {
    IToken stepToken = new Token(new TextAttribute(fColors.getColor(new RGB(200, 100, 100)), null, SWT.BOLD));
    SingleLineRule stepRule = new SingleLineRule("[[", "]]", stepToken);
    //		stepRule.setColumnConstraint(0);
    return stepRule;
  }

  private IRule createExternalHTTPRule() {
    IToken stepToken = new Token(new TextAttribute(fColors.getColor(new RGB(200, 100, 100)), null, SWT.BOLD));
    SingleLineRule stepRule = new SingleLineRule("[http", "]", stepToken);
    //		stepRule.setColumnConstraint(0);
    return stepRule;
  }
  
  /*
   * @see SourceViewerConfiguration#getReconciler(ISourceViewer)
   */
  public IReconciler getReconciler(ISourceViewer sourceViewer) {
    WikiReconcilingStrategy strategy = new WikiReconcilingStrategy(fEditor);
    MonoReconciler reconciler = new MonoReconciler(strategy, false);
    reconciler.setProgressMonitor(new NullProgressMonitor());
    reconciler.setDelay(500);

    return reconciler;
  }

  /*
   * @see org.eclipse.jface.text.source.SourceViewerConfiguration#getContentAssistant(org.eclipse.jface.text.source.ISourceViewer)
   */
  public IContentAssistant getContentAssistant(ISourceViewer sourceViewer) {
    ContentAssistant assistant = new ContentAssistant();

    IContentAssistProcessor processor = new WikiCompletionProcessor(fEditor);
    assistant.setContentAssistProcessor(processor, IDocument.DEFAULT_CONTENT_TYPE);

    assistant.setContextInformationPopupOrientation(IContentAssistant.CONTEXT_INFO_ABOVE);
    assistant.setInformationControlCreator(getInformationControlCreator(sourceViewer));
    assistant.enableAutoInsert(true);

    return assistant;
  }

  /*
   * @see org.eclipse.jface.text.source.SourceViewerConfiguration#getAnnotationHover(org.eclipse.jface.text.source.ISourceViewer)
   */
  public IAnnotationHover getAnnotationHover(ISourceViewer sourceViewer) {
    return new NullHover();
  }
}