package com.aptana.ruby.internal.debug.core.parsing;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import com.aptana.core.util.StringUtil;
import com.aptana.ruby.debug.core.RubyDebugCorePlugin;
import com.aptana.ruby.internal.debug.core.model.RubyStackFrame;
import com.aptana.ruby.internal.debug.core.model.RubyThread;

@SuppressWarnings("nls")
public class FramesReader extends XmlStreamReader
{

	private RubyThread thread;
	private List<RubyStackFrame> frames;

	public FramesReader(XmlPullParser xpp)
	{
		super(xpp);
	}

	public FramesReader(AbstractReadStrategy readStrategy)
	{
		super(readStrategy);
	}

	public RubyStackFrame[] readFrames(RubyThread thread)
	{

		this.thread = thread;
		this.frames = new ArrayList<RubyStackFrame>();
		try
		{
			this.read();
		}
		catch (Exception ex)
		{
			RubyDebugCorePlugin.log(ex);
			return new RubyStackFrame[0];
		}
		Collections.sort(frames, new Comparator<RubyStackFrame>()
		{
			public int compare(RubyStackFrame one, RubyStackFrame two)
			{
				return Integer.valueOf(one.getIndex()).compareTo(Integer.valueOf(two.getIndex()));
			}

		});
		RubyStackFrame[] frameArray = new RubyStackFrame[frames.size()];
		frames.toArray(frameArray);
		thread.setStackFrames(frameArray);
		return frameArray;
	}

	protected boolean processStartElement(XmlPullParser xpp)
	{

		String name = xpp.getName();
		if (name.equals("frames"))
		{
			return true;
		}
		if (name.equals("frame"))
		{
			int line = Integer.parseInt(xpp.getAttributeValue(StringUtil.EMPTY, "line"));
			int index = Integer.parseInt(xpp.getAttributeValue(StringUtil.EMPTY, "no"));
			String file = xpp.getAttributeValue(StringUtil.EMPTY, "file");
			this.frames.add(new RubyStackFrame(thread, file, line, index));
			return true;
		}
		return false;
	}

	protected boolean processEndElement(XmlPullParser xpp)
	{
		return xpp.getName().equals("frames");
	}
}