package net.sf.xpontus.view.editor;

import javax.swing.text.Element;
import javax.swing.text.PlainView;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.io.Reader;
import java.io.StringReader;
import java.util.List;
import java.util.Map;

import javax.swing.text.Element;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.PlainView;
import javax.swing.text.Segment;
import javax.swing.text.Utilities;

import net.sf.xpontus.view.editor.syntax.CharStream;
import net.sf.xpontus.view.editor.syntax.FastCharStream;
import net.sf.xpontus.view.editor.syntax.StyleInfo;
import net.sf.xpontus.view.editor.syntax.SyntaxSupport;
import net.sf.xpontus.view.editor.syntax.Token;
import net.sf.xpontus.view.editor.syntax.TokenMgrError;
import net.sf.xpontus.view.editor.syntax.java.JavaParser;

/**
 * A Swing view implementation that colorizes lines of a SyntaxDocument using a
 * TokenMarker.
 * 
 * This class should not be used directly; a SyntaxEditorKit should be used
 * instead.
 * 
 * 
 * @author Yves Zoundi
 * 
 * @version $Id: SyntaxView.java,v 1.1.1.1 2005/12/08 01:34:34 yveszoundi Exp $
 */
public class SyntaxView2 extends PlainView {
	private Segment line;

	private Segment seg = new Segment();

	private ILexer lexer;

	private Color defaultColor = Color.BLACK;

	private Map styleMap;

	/**
	 * @param e
	 * @param provider
	 * @param lexer
	 */
	public SyntaxView2(Element e, SyntaxSupport syntaxSupport) {
		super(e);
		line = new Segment();
		this.styleMap = syntaxSupport.getColorProvider().getStyles();
		this.lexer = syntaxSupport.getLexer();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.swing.text.PlainView#drawLine(int, java.awt.Graphics, int,
	 *      int)
	 */
	protected void drawLine(int lineIndex, Graphics g, int x, int y) {
		Graphics2D g2d = (Graphics2D) g;
		g2d.setColor(Color.BLACK);
		try {
			Element lineElement = getElement().getElement(lineIndex);
			int start = lineElement.getStartOffset();
			int end = lineElement.getEndOffset();

						
			

			int last = start;
			int realStart;
			int thisStart;
			boolean gotMatch = false;

			Token token = null;

			List tokenList = (List)((MutableAttributeSet)lineElement.getAttributes()).getAttribute("tokenList");
			for(int i=0;i<tokenList.size();i++){
				token = (Token)tokenList.get(i);
				int tokenId = token.kind;

				gotMatch = true;

				int tokenSize = token.image.length();
				realStart = token.beginColumn + start;

				if (last < realStart) {
					g2d.setColor(defaultColor);
					g2d.setFont(g2d.getFont().deriveFont(Font.PLAIN));

					int middle = Math.abs(realStart - last);
					getDocument().getText(last, middle, seg);
					x = Utilities.drawTabbedText(seg, x, y, g2d, this, 0);
				}

				setFont(g2d, tokenId);

				/* get segement of text for lexer match */
				getDocument().getText(realStart, tokenSize, seg);

				thisStart = x;

				x = Utilities.drawTabbedText(seg, x, y, g2d, this, 0);

				// draw underlines if needed
				if (styleMap.containsKey(new Integer(tokenId))) {
					StyleInfo m_style;
					m_style = (StyleInfo) styleMap.get(new Integer(tokenId));

					if (m_style.underlined) {
						g2d.drawLine(thisStart, y + 2, x, y + 2);
					}
				}

				last = realStart + tokenSize;
			}

			g2d.setColor(defaultColor);
			g2d.setFont(g2d.getFont().deriveFont(Font.PLAIN));

			if ((last < end) && gotMatch) {
				// draw text from end of last match to end of segment
				getDocument().getText(last, end - last, seg);
				x = Utilities.drawTabbedText(seg, x, y, g2d, this, 0);
			} else if (!gotMatch) {
				// no match - draw whole segment
				Utilities.drawTabbedText(line, x, y, g2d, this, 0);
			}
		} catch (TokenMgrError e) {
		    Utilities.drawTabbedText(seg, x, y, g2d, this, 0);
		} catch (Exception e) {

		}
	}

	/**
	 * @param g2d
	 * @param val
	 */
	private void setFont(Graphics2D g2d, int val) {
		g2d.setFont(g2d.getFont().deriveFont(Font.PLAIN));

		if (styleMap.containsKey(new Integer(val))) {
			StyleInfo style = (StyleInfo) styleMap.get(new Integer(val));
			g2d.setColor(style.color);

			if (style.bold && style.italic) {
				g2d.setFont(g2d.getFont().deriveFont(Font.BOLD | Font.ITALIC));
			} else if (style.bold) {
				g2d.setFont(g2d.getFont().deriveFont(Font.BOLD));
			} else if (style.italic) {
				g2d.setFont(g2d.getFont().deriveFont(Font.ITALIC));
			}
		} else {
			g2d.setColor(defaultColor);
		}
	}
}