/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307, USA
 */

package edu.umd.cs.findbugs.sourceViewer;

import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Shape;
import java.util.WeakHashMap;

import javax.swing.text.Element;
import javax.swing.text.ParagraphView;
import javax.swing.text.View;

import edu.umd.cs.findbugs.gui2.Driver;


// Code inspired by http://www.developer.com/java/other/article.php/3318421

class NumberedParagraphView extends ParagraphView {
	public final static int NUMBERS_WIDTH= (int) Driver.getFontSize()*3+9;
	HighlightInformation highlight;
	public NumberedParagraphView(Element e, HighlightInformation highlight) {
		super(e);
		this.highlight = highlight;
	}

//    protected void setInsets(short top, short left, short bottom,
//            short right) {super.setInsets
//            (top,(short)(left+NUMBERS_WIDTH),
//            bottom,right);
//}
	@Override
	public void paint(Graphics g, Shape allocation) {
		Rectangle r = (allocation instanceof Rectangle) ?
				(Rectangle)allocation : allocation.getBounds();

		Color oldColor = g.getColor();
		Integer lineNumber = getLineNumber();
		Color highlightColor = highlight.getHighlight(lineNumber);
		if (highlightColor != null) {
			g.setColor(highlightColor);
			g.fillRect(r.x, r.y, r.width, r.height);
			g.setColor(oldColor);
		}
		// r.x += NUMBERS_WIDTH;

		super.paint(g, r);


		FontMetrics metrics = g.getFontMetrics();

		g.setColor(Color.GRAY);
		String lineNumberString = lineNumber.toString();
		int width = metrics.stringWidth(lineNumberString);
		int numberX = r.x - width-9 + NUMBERS_WIDTH;
		int numberY = r.y + metrics.getAscent();

		g.drawString(lineNumberString, numberX, numberY);
		g.setColor(oldColor);
		// System.out.println("Drawing line for " + lineNumber + " @ " + numberX +"," + numberY);
		// r.x -= NUMBERS_WIDTH;

	}

	public int getPreviousLineCount0() {
		int lineCount = 0;
		View parent = this.getParent();
		int count = parent.getViewCount();
		for (int i = 0; i < count; i++) {
			if (parent.getView(i) == this) {
				break;
			}
			else {
				lineCount += parent.getView(i).getViewCount();
			}
		}
		return lineCount;
	}
	static WeakHashMap<Element, Integer> elementLineNumberCache = new WeakHashMap<Element, Integer>();
	public Integer getLineNumber() {

		Element element = this.getElement();
		Integer result = elementLineNumberCache.get(element);
		if (result != null) return result;
		Element parent = element.getParentElement();
		int count = parent.getElementCount();
		for (int i = 0; i < count; i++) {
			elementLineNumberCache.put(parent.getElement(i), i+1);
		}
		result = elementLineNumberCache.get(element);
		if (result != null) return result;
		return -1;

	}
}