/*******************************************************************************
 * Copyright (c) 2001, 2010 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.debug;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IBreakpointManager;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.source.IVerticalRulerInfo;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.IDocumentProviderExtension4;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.util.Debug;
import org.eclipse.wst.sse.ui.internal.Logger;
import org.eclipse.wst.sse.ui.internal.SSEUIMessages;
import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;
import org.eclipse.wst.sse.ui.internal.extension.BreakpointProviderBuilder;
import org.eclipse.wst.sse.ui.internal.provisional.extensions.ISourceEditingTextTools;
import org.eclipse.wst.sse.ui.internal.provisional.extensions.breakpoint.IBreakpointProvider;

/**
 * ToggleBreakpointAction
 */
public class ToggleBreakpointAction extends BreakpointRulerAction {
	IAction fFallbackAction;

	/**
	 * @param editor
	 * @param rulerInfo
	 */
	public ToggleBreakpointAction(ITextEditor editor, IVerticalRulerInfo rulerInfo) {
		super(editor, rulerInfo);
		setText(SSEUIMessages.ToggleBreakpointAction_0); //$NON-NLS-1$
	}

	public ToggleBreakpointAction(ITextEditor editor, IVerticalRulerInfo rulerInfo, IAction fallbackAction) {
		this(editor, rulerInfo);
		fFallbackAction = fallbackAction;
	}

	protected boolean createBreakpoints(int lineNumber) {
		/*
		 * Note: we'll always allow processing to continue, even for a "read
		 * only" IStorageEditorInput, for the ActiveScript debugger. But this
		 * means sometimes the ActiveScript provider might get an input from
		 * CVS or something that is not related to debugging.
		 */

		ITextEditor editor = getTextEditor();
		IEditorInput input = editor.getEditorInput();
		IDocument document = editor.getDocumentProvider().getDocument(input);
		if (document == null)
			return false;

		String contentType = getContentType(document);
		IBreakpointProvider[] providers = BreakpointProviderBuilder.getInstance().getBreakpointProviders(editor, contentType, getFileExtension(input));

		int pos = -1;
		ISourceEditingTextTools tools = (ISourceEditingTextTools) editor.getAdapter(ISourceEditingTextTools.class);
		if (tools != null) {
			pos = tools.getCaretOffset();
		}

		final int n = providers.length;
		List errors = new ArrayList(0);
		for (int i = 0; i < n; i++) {
			try {
				if (Debug.debugBreakpoints)
					System.out.println(providers[i].getClass().getName() + " adding breakpoint to line " + lineNumber); //$NON-NLS-1$
				IStatus status = providers[i].addBreakpoint(document, input, lineNumber, pos);
				if (status != null && !status.isOK()) {
					errors.add(status);
				}
			}
			catch (CoreException e) {
				errors.add(e.getStatus());
			}
			catch (Exception t) {
				Logger.logException("exception while adding breakpoint", t); //$NON-NLS-1$
			}
		}

		IStatus status = null;
		if (errors.size() > 0) {
			Shell shell = editor.getSite().getShell();
			if (errors.size() > 1) {
				status = new MultiStatus(SSEUIPlugin.ID, IStatus.OK, (IStatus[]) errors.toArray(new IStatus[0]), SSEUIMessages.ManageBreakpoints_error_adding_message1, null); //$NON-NLS-1$
			}
			else {
				status = (IStatus) errors.get(0);
			}
			if ((status.getSeverity() > IStatus.INFO) || (Platform.inDebugMode() && !status.isOK())) {
				Platform.getLog(SSEUIPlugin.getDefault().getBundle()).log(status);
			}
			/*
			 * Show for conditions more severe than INFO or when no
			 * breakpoints were created
			 */
			if (status.getSeverity() > IStatus.INFO && getBreakpoints(getMarkers()).length < 1) {
				ErrorDialog.openError(shell, SSEUIMessages.ManageBreakpoints_error_adding_title1, status.getMessage(), status); //$NON-NLS-1$ //$NON-NLS-2$
				return false;
			}
		}
		/*
		 * Although no errors were reported, no breakpoints exist on this line
		 * after having run the existing providers. Run the fallback action.
		 */
		if ((status == null || status.getSeverity() < IStatus.WARNING) && fFallbackAction != null && !hasMarkers()) {
			if (fFallbackAction instanceof ISelectionListener) {
				((ISelectionListener) fFallbackAction).selectionChanged(null, null);
			}
			fFallbackAction.run();
		}
		return true;
	}

	protected String getContentType(IDocument document) {
		IModelManager mgr = StructuredModelManager.getModelManager();
		String contentType = null;

		IDocumentProvider provider = fTextEditor.getDocumentProvider();
		if (provider instanceof IDocumentProviderExtension4) {
			try {
				IContentType type = ((IDocumentProviderExtension4) provider).getContentType(fTextEditor.getEditorInput());
				if (type != null)
					contentType = type.getId();
			}
			catch (CoreException e) {
				/*
				 * A failure accessing the underlying store really isn't
				 * interesting, although it can be a problem for
				 * IStorageEditorInputs.
				 */
			}
		}

		if (contentType == null) {
			IStructuredModel model = null;
			try {
				model = mgr.getExistingModelForRead(document);
				if (model != null) {
					contentType = model.getContentTypeIdentifier();
				}
			}
			finally {
				if (model != null) {
					model.releaseFromRead();
				}
			}
		}
		return contentType;
	}

	protected void removeBreakpoints(int lineNumber) {
		IBreakpointManager breakpointManager = DebugPlugin.getDefault().getBreakpointManager();
		IBreakpoint[] breakpoints = getBreakpoints(getMarkers());
		for (int i = 0; i < breakpoints.length; i++) {
			try {
				breakpointManager.removeBreakpoint(breakpoints[i], true);
			}
			catch (CoreException e) {
				Logger.logException(e);
			}
		}
	}

	public void run() {
		int lineNumber = fRulerInfo.getLineOfLastMouseButtonActivity() + 1;
		boolean doAdd = !hasMarkers();
		if (doAdd)
			createBreakpoints(lineNumber);
		else
			removeBreakpoints(lineNumber);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.texteditor.IUpdate#update()
	 */
	public void update() {
	}
	
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.action.Action#getImageDescriptor()
	 * overriding for lazy loading
	 */
	public ImageDescriptor getImageDescriptor() {
		
		ImageDescriptor image = super.getImageDescriptor();
		if (image == null){
			image = DebugUITools.getImageDescriptor(IDebugUIConstants.IMG_OBJS_BREAKPOINT);
			setImageDescriptor(image);
		}
		return image;
	}
}
