/*******************************************************************************
 * Copyright (c) 2007 Chase Technology Ltd - http://www.chasetechnology.co.uk
 * 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:
 *     Doug Satchwell (Chase Technology Ltd) - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xsl.internal.debug.ui.model;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.debug.core.model.ILineBreakpoint;
import org.eclipse.debug.ui.actions.IToggleBreakpointsTarget;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.xsl.launching.model.IXSLConstants;
import org.eclipse.wst.xsl.launching.model.XSLLineBreakpoint;

public class XSLLineBreakpointAdapter implements IToggleBreakpointsTarget
{
	public void toggleLineBreakpoints(IWorkbenchPart part, ISelection selection) throws CoreException
	{
		ITextEditor textEditor = getEditor(part);
		if (textEditor != null)
		{
			IResource resource = (IResource) textEditor.getEditorInput().getAdapter(IResource.class);
			ITextSelection textSelection = (ITextSelection) selection;
			int lineNumber = textSelection.getStartLine();
			IBreakpoint[] breakpoints = DebugPlugin.getDefault().getBreakpointManager().getBreakpoints(IXSLConstants.ID_XSL_DEBUG_MODEL);
			for (IBreakpoint breakpoint : breakpoints)
			{
				if (resource.equals(breakpoint.getMarker().getResource()))
				{
					if (((ILineBreakpoint) breakpoint).getLineNumber() == (lineNumber + 1))
					{
						// remove
						breakpoint.delete();
						return;
					}
				}
			}
			// create line breakpoint (doc line numbers start at 0)
			XSLLineBreakpoint lineBreakpoint = new XSLLineBreakpoint(resource, lineNumber + 1, 1, 1);
			DebugPlugin.getDefault().getBreakpointManager().addBreakpoint(lineBreakpoint);
		}
	}

	public boolean canToggleLineBreakpoints(IWorkbenchPart part, ISelection selection)
	{
		return getEditor(part) != null;
	}

	/**
	 * Returns the editor being used to edit a XSL file, associated with the
	 * given part, or <code>null</code> if none.
	 */
	private ITextEditor getEditor(IWorkbenchPart part)
	{
		if (part instanceof ITextEditor)
		{
			ITextEditor editorPart = (ITextEditor) part;
			IResource resource = (IResource) editorPart.getEditorInput().getAdapter(IResource.class);
			if (resource != null)
			{
				String extension = resource.getFileExtension();
				// TODO handle other file extensions/content types
				if (extension != null && extension.equalsIgnoreCase("xsl"))
				{
					return editorPart;
				}
			}
		}
		return null;
	}

	public void toggleMethodBreakpoints(IWorkbenchPart part, ISelection selection) throws CoreException
	{
	}

	public boolean canToggleMethodBreakpoints(IWorkbenchPart part, ISelection selection)
	{
		return false;
	}

	public void toggleWatchpoints(IWorkbenchPart part, ISelection selection) throws CoreException
	{
	}

	public boolean canToggleWatchpoints(IWorkbenchPart part, ISelection selection)
	{
		return false;
	}
}