/*******************************************************************************
 * Copyright (c) 2005, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.debug.ui.actions;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.InvocationTargetException;
import java.nio.charset.StandardCharsets;
import java.text.MessageFormat;
import java.util.Map.Entry;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.debug.internal.ui.IInternalDebugUIConstants;
import org.eclipse.debug.internal.ui.importexport.breakpoints.IImportExportConstants;
import org.eclipse.debug.internal.ui.importexport.breakpoints.ImportExportMessages;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.IWorkingSetManager;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.XMLMemento;

/**
 * Exports breakpoints to a file or string buffer.
 * <p>
 * This class may be instantiated.
 * <p>
 * @since 3.2
 * @noextend This class is not intended to be sub-classed by clients.
 */
public class ExportBreakpointsOperation implements IRunnableWithProgress {

	private IBreakpoint[] fBreakpoints = null;
	/**
	 * Only one of file name or writer is used depending how the operation is
	 * created.
	 */
	private String fFileName = null;
	private StringWriter fWriter = null;

	/**
	 * Constructs an operation to export breakpoints to a file.
	 *
	 * @param breakpoints the breakpoints to export
	 * @param fileName absolute path of file to export breakpoints to - the file
	 * 	will be overwritten if it already exists
	 */
	public ExportBreakpointsOperation(IBreakpoint[] breakpoints, String fileName) {
		fBreakpoints = breakpoints;
		fFileName = fileName;
	}

	/**
	 * Constructs an operation to export breakpoints to a string buffer. The buffer
	 * is available after the operation is run via {@link #getBuffer()}.
	 *
	 * @param breakpoints the breakpoints to export
	 * @since 3.5
	 */
	public ExportBreakpointsOperation(IBreakpoint[] breakpoints) {
		fBreakpoints = breakpoints;
		fWriter = new StringWriter();
	}

	@Override
	public void run(IProgressMonitor monitor) throws InvocationTargetException {
		SubMonitor localmonitor = SubMonitor.convert(monitor, ImportExportMessages.ExportOperation_0, fBreakpoints.length);
		XMLMemento memento = XMLMemento.createWriteRoot(IImportExportConstants.IE_NODE_BREAKPOINTS);
		try (Writer writer = fWriter) {
			for (IBreakpoint breakpoint : fBreakpoints) {
				if (localmonitor.isCanceled()) {
					return;
				}
				//in the event we are in working set view, we can have multiple selection of the same breakpoint
				//so do a simple check for it
				IMarker marker = breakpoint.getMarker();
				IMemento root = memento.createChild(IImportExportConstants.IE_NODE_BREAKPOINT);
				root.putString(IImportExportConstants.IE_BP_ENABLED, Boolean.toString(breakpoint.isEnabled()));
				root.putString(IImportExportConstants.IE_BP_REGISTERED, Boolean.toString(breakpoint.isRegistered()));
				root.putString(IImportExportConstants.IE_BP_PERSISTANT, Boolean.toString(breakpoint.isPersisted()));
				//write out the resource information
				IResource resource = marker.getResource();
				IMemento child = root.createChild(IImportExportConstants.IE_NODE_RESOURCE);
				child.putString(IImportExportConstants.IE_NODE_PATH, resource.getFullPath().toPortableString());
				child.putInteger(IImportExportConstants.IE_NODE_TYPE, resource.getType());
				//a generalized (name, value) pairing for attributes each stored as an ATTRIB element
				root = root.createChild(IImportExportConstants.IE_NODE_MARKER);
				root.putString(IImportExportConstants.IE_NODE_TYPE, marker.getType());
				Object val = marker.getAttribute(IMarker.LINE_NUMBER);
				root.putString(IMarker.LINE_NUMBER, (val != null) ? val.toString() : null);
				val = marker.getAttribute(IImportExportConstants.CHARSTART);
				root.putString(IImportExportConstants.CHARSTART, (val != null) ? val.toString() : null);
				String value = null;
				boolean wsattrib = false;
				for (Entry<String, Object> entry : marker.getAttributes().entrySet()) {
					String iterval = entry.getKey();
					value = entry.getValue().toString();
					if(!iterval.equals(IMarker.LINE_NUMBER)) {
						child = root.createChild(IImportExportConstants.IE_NODE_ATTRIB);
						if(iterval.equals(IInternalDebugUIConstants.WORKING_SET_NAME)) {
							wsattrib = true;
							value = getWorkingSetsAttribute(breakpoint);
						}
						child.putString(IImportExportConstants.IE_NODE_NAME, iterval);
						child.putString(IImportExportConstants.IE_NODE_VALUE, value);
					}
				}
				if(!wsattrib) {
					//ensure the working set infos are present if not previously updated
					child = root.createChild(IImportExportConstants.IE_NODE_ATTRIB);
					child.putString(IImportExportConstants.IE_NODE_NAME, IInternalDebugUIConstants.WORKING_SET_NAME);
					child.putString(IImportExportConstants.IE_NODE_VALUE, getWorkingSetsAttribute(breakpoint));
					child = root.createChild(IImportExportConstants.IE_NODE_ATTRIB);
					child.putString(IImportExportConstants.IE_NODE_NAME, IInternalDebugUIConstants.WORKING_SET_ID);
					child.putString(IImportExportConstants.IE_NODE_VALUE, IDebugUIConstants.BREAKPOINT_WORKINGSET_ID);
				}
				localmonitor.worked(1);
			}
			if (writer == null) {
				try (Writer outWriter = new OutputStreamWriter(new FileOutputStream(fFileName), StandardCharsets.UTF_8)) {
					memento.save(outWriter);
				}
			} else {
				memento.save(writer);
			}

		} catch (CoreException e) {
			throw new InvocationTargetException(e);
		} catch (IOException e) {
			throw new InvocationTargetException(e, MessageFormat.format("There was a problem writing file: {0}", new Object[] { fFileName })); //$NON-NLS-1$
		}
		finally {
			localmonitor.done();
		}
	}

	/**
	 * Collects all of the breakpoint working sets that contain the given {@link IBreakpoint}
	 * in the given list
	 *
	 * @param breakpoint the breakpoint to get working set information about
	 * @return the {@link IImportExportConstants#DELIMITER} delimited {@link String} for all of the work sets the given breakpoint belongs to
	 * @since 3.5
	 */
	private String getWorkingSetsAttribute(IBreakpoint breakpoint) {
		IWorkingSetManager mgr = PlatformUI.getWorkbench().getWorkingSetManager();
		StringBuilder buffer = new StringBuilder();
		IWorkingSet[] sets = mgr.getWorkingSets();
		for (IWorkingSet set : sets) {
			if (IDebugUIConstants.BREAKPOINT_WORKINGSET_ID.equals(set.getId()) && containsBreakpoint(set, breakpoint)) {
				buffer.append(IImportExportConstants.DELIMITER).append(set.getName());
			}
		}
		return buffer.toString();
	}

	/**
	 * Method to ensure markers and breakpoints are not both added to the working set
	 * @param set the set to check
	 * @param breakpoint the breakpoint to check for existence
	 * @return true if it is present false otherwise
	 * @since 3.5
	 */
	private boolean containsBreakpoint(IWorkingSet set, IBreakpoint breakpoint) {
		IAdaptable[] elements = set.getElements();
		for (IAdaptable element : elements) {
			if (element.equals(breakpoint)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns a string buffer containing a memento of the exported breakpoints
	 * or <code>null</code> if the operation was configured to export to a file.
	 * The memento can be used to import breakpoints into the workspace using an
	 * {@link ImportBreakpointsOperation}.
	 *
	 * @return a string buffer containing a memento of the exported breakpoints
	 * or <code>null</code> if the operation was configured to export to a file
	 * @since 3.5
	 */
	public StringBuffer getBuffer() {
		if (fWriter != null) {
			return fWriter.getBuffer();
		}
		return null;
	}


}