package org.eclipse.jface.dialogs;
/******************************************************************************* 
 * Copyright (c) 2000, 2004 IBM Corporation and others. 
 * All rights reserved. This program and the accompanying materials! 
 * are made available under the terms of the Common Public License v1.0 
 * which accompanies this distribution, and is available at 
 * http://www.eclipse.org/legal/cpl-v10.html 
 * 
 * Contributors: 
 * 		IBM Corporation - initial API and implementation 
 * 		Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog font should
 * 			be activated and used by other components.
 ******************************************************************************/
import java.util.Arrays;
import java.util.Iterator;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
/**
 * A dialog to display one or more errors to the user, as contained in an
 * <code>IStatus</code> object. If an error contains additional detailed
 * information then a Details button is automatically supplied, which shows or
 * hides an error details viewer when pressed by the user.
 * 
 * @see org.eclipse.core.runtime.IStatus
 */
public class ErrorDialog extends IconAndMessageDialog {
	/**
	 * Static to prevent opening of error dialogs for automated testing.
	 */
	public static boolean AUTOMATED_MODE = false;
	/**
	 * Reserve room for this many list items.
	 */
	private static final int LIST_ITEM_COUNT = 7;
	/**
	 * The nesting indent.
	 */
	private static final String NESTING_INDENT = "  "; //$NON-NLS-1$
	/**
	 * The Details button.
	 */
	private Button detailsButton;
	/**
	 * The title of the dialog.
	 */
	private String title;
	/**
	 * The SWT list control that displays the error details.
	 */
	private List list;
	/**
	 * Indicates whether the error details viewer is currently created.
	 */
	private boolean listCreated = false;
	/**
	 * Filter mask for determining which status items to display.
	 */
	private int displayMask = 0xFFFF;
	/**
	 * The main status object.
	 */
	private IStatus status;
	/**
	 * The current clipboard. To be disposed when closing the dialog.
	 */
	private Clipboard clipboard;
	/**
	 * List of the main error object's detailed errors (element type:
	 * <code>IStatus</code>).
	 */
	private java.util.List statusList;
	/**
	 * Creates an error dialog. Note that the dialog will have no visual
	 * representation (no widgets) until it is told to open.
	 * <p>
	 * Normally one should use <code>openError</code> to create and open one
	 * of these. This constructor is useful only if the error object being
	 * displayed contains child items <it>and </it> you need to specify a mask
	 * which will be used to filter the displaying of these children.
	 * </p>
	 * 
	 * @param parentShell
	 *            the shell under which to create this dialog
	 * @param dialogTitle
	 *            the title to use for this dialog, or <code>null</code> to
	 *            indicate that the default title should be used
	 * @param message
	 *            the message to show in this dialog, or <code>null</code> to
	 *            indicate that the error's message should be shown as the
	 *            primary message
	 * @param status
	 *            the error to show to the user
	 * @param displayMask
	 *            the mask to use to filter the displaying of child items, as
	 *            per <code>IStatus.matches</code>
	 * @see org.eclipse.core.runtime.IStatus#matches(int)
	 */
	public ErrorDialog(Shell parentShell, String dialogTitle, String message,
			IStatus status, int displayMask) {
		super(parentShell);
		this.title = dialogTitle == null ? JFaceResources
				.getString("Problem_Occurred") : //$NON-NLS-1$
				dialogTitle;
		this.message = message == null ? status.getMessage() : JFaceResources
				.format("Reason", new Object[]{message, status.getMessage()}); //$NON-NLS-1$
		this.status = status;
		statusList = Arrays.asList(status.getChildren());
		this.displayMask = displayMask;
		setShellStyle(SWT.DIALOG_TRIM | SWT.RESIZE | SWT.APPLICATION_MODAL);
	}
	/*
	 * (non-Javadoc) Method declared on Dialog. Handles the pressing of the Ok
	 * or Details button in this dialog. If the Ok button was pressed then close
	 * this dialog. If the Details button was pressed then toggle the displaying
	 * of the error details area. Note that the Details button will only be
	 * visible if the error being displayed specifies child details.
	 */
	protected void buttonPressed(int id) {
		if (id == IDialogConstants.DETAILS_ID) {
			// was the details button pressed?
			toggleDetailsArea();
		} else {
			super.buttonPressed(id);
		}
	}
	/*
	 * (non-Javadoc) Method declared in Window.
	 */
	protected void configureShell(Shell shell) {
		super.configureShell(shell);
		shell.setText(title);
	}
	/*
	 * (non-Javadoc) Method declared on Dialog.
	 */
	protected void createButtonsForButtonBar(Composite parent) {
		// create OK and Details buttons
		createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL,
				true);
		if (status.isMultiStatus()) {
			detailsButton = createButton(parent, IDialogConstants.DETAILS_ID,
					IDialogConstants.SHOW_DETAILS_LABEL, false);
		}
	}
	/**
	 * This implementation of the <code>Dialog</code> framework method creates
	 * and lays out a composite and calls <code>createMessageArea</code> and
	 * <code>createCustomArea</code> to populate it. Subclasses should
	 * override <code>createCustomArea</code> to add contents below the
	 * message.
	 */
	protected Control createDialogArea(Composite parent) {
		createMessageArea(parent);
		// create a composite with standard margins and spacing
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
		layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
		layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
		layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
		layout.numColumns = 2;
		composite.setLayout(layout);
		GridData childData = new GridData(GridData.FILL_BOTH);
		childData.horizontalSpan = 2;
		composite.setLayoutData(childData);
		composite.setFont(parent.getFont());
		return composite;
	}
	/*
	 * @see IconAndMessageDialog#createDialogAndButtonArea(Composite)
	 */
	protected void createDialogAndButtonArea(Composite parent) {
		super.createDialogAndButtonArea(parent);
		if (this.dialogArea instanceof Composite) {
			//Create a label if there are no children to force a smaller layout
			Composite dialogComposite = (Composite) dialogArea;
			if (dialogComposite.getChildren().length == 0)
				new Label(dialogComposite, SWT.NULL);
		}
	}
	/*
	 *  (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.IconAndMessageDialog#getImage()
	 */
	protected Image getImage() {
		if (status != null) {
			if (status.getSeverity() == IStatus.WARNING)
				return getWarningImage();
			if (status.getSeverity() == IStatus.INFO)
				return getInfoImage();
		}
		//If it was not a warning or an error then return the error image
		return getErrorImage();
	}
	/**
	 * Create this dialog's drop-down list component.
	 * 
	 * @param parent
	 *            the parent composite
	 * @return the drop-down list component
	 */
	protected List createDropDownList(Composite parent) {
		// create the list
		list = new List(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL
				| SWT.MULTI);
		// fill the list
		populateList(list);
		GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL
				| GridData.GRAB_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL
				| GridData.GRAB_VERTICAL);
		data.heightHint = list.getItemHeight() * LIST_ITEM_COUNT;
		data.horizontalSpan = 2;
		list.setLayoutData(data);
		list.setFont(parent.getFont());
		Menu copyMenu = new Menu(list);
		MenuItem copyItem = new MenuItem(copyMenu, SWT.NONE);
		copyItem.addSelectionListener(new SelectionListener() {
			/*
			 * @see SelectionListener.widgetSelected (SelectionEvent)
			 */
			public void widgetSelected(SelectionEvent e) {
				copyToClipboard();
			}
			/*
			 * @see SelectionListener.widgetDefaultSelected(SelectionEvent)
			 */
			public void widgetDefaultSelected(SelectionEvent e) {
				copyToClipboard();
			}
		});
		copyItem.setText(JFaceResources.getString("copy")); //$NON-NLS-1$
		list.setMenu(copyMenu);
		listCreated = true;
		return list;
	}
	/*
	 * (non-Javadoc) Method declared on Window.
	 */
	/**
	 * Extends <code>Window.open()</code>. Opens an error dialog to display
	 * the error. If you specified a mask to filter the displaying of these
	 * children, the error dialog will only be displayed if there is at least
	 * one child status matching the mask.
	 */
	public int open() {
		if (!AUTOMATED_MODE && shouldDisplay(status, displayMask)) {
			return super.open();
		}
		setReturnCode(OK);
		return OK;
	}
	/**
	 * Opens an error dialog to display the given error. Use this method if the
	 * error object being displayed does not contain child items, or if you wish
	 * to display all such items without filtering.
	 * 
	 * @param parent
	 *            the parent shell of the dialog, or <code>null</code> if none
	 * @param dialogTitle
	 *            the title to use for this dialog, or <code>null</code> to
	 *            indicate that the default title should be used
	 * @param message
	 *            the message to show in this dialog, or <code>null</code> to
	 *            indicate that the error's message should be shown as the
	 *            primary message
	 * @param status
	 *            the error to show to the user
	 * @return the code of the button that was pressed that resulted in this
	 *         dialog closing. This will be <code>Dialog.OK</code> if the OK
	 *         button was pressed, or <code>Dialog.CANCEL</code> if this
	 *         dialog's close window decoration or the ESC key was used.
	 */
	public static int openError(Shell parent, String dialogTitle,
			String message, IStatus status) {
		return openError(parent, dialogTitle, message, status, IStatus.OK
				| IStatus.INFO | IStatus.WARNING | IStatus.ERROR);
	}
	/**
	 * Opens an error dialog to display the given error. Use this method if the
	 * error object being displayed contains child items <it>and </it> you wish
	 * to specify a mask which will be used to filter the displaying of these
	 * children. The error dialog will only be displayed if there is at least
	 * one child status matching the mask.
	 * 
	 * @param parentShell
	 *            the parent shell of the dialog, or <code>null</code> if none
	 * @param title
	 *            the title to use for this dialog, or <code>null</code> to
	 *            indicate that the default title should be used
	 * @param message
	 *            the message to show in this dialog, or <code>null</code> to
	 *            indicate that the error's message should be shown as the
	 *            primary message
	 * @param status
	 *            the error to show to the user
	 * @param displayMask
	 *            the mask to use to filter the displaying of child items, as
	 *            per <code>IStatus.matches</code>
	 * @return the code of the button that was pressed that resulted in this
	 *         dialog closing. This will be <code>Dialog.OK</code> if the OK
	 *         button was pressed, or <code>Dialog.CANCEL</code> if this
	 *         dialog's close window decoration or the ESC key was used.
	 * @see org.eclipse.core.runtime.IStatus#matches(int)
	 */
	public static int openError(Shell parentShell, String title,
			String message, IStatus status, int displayMask) {
		ErrorDialog dialog = new ErrorDialog(parentShell, title, message,
				status, displayMask);
		return dialog.open();
	}
	/**
	 * Populates the list using this error dialog's status object. This walks
	 * the child static of the status object and displays them in a list. The
	 * format for each entry is status_path : status_message If the status's
	 * path was null then it (and the colon) are omitted.
	 * @param listToPopulate The list to fill.
	 */
	private void populateList(List listToPopulate) {
		Iterator enum = statusList.iterator();
		while (enum.hasNext()) {
			IStatus childStatus = (IStatus) enum.next();
			populateList(listToPopulate, childStatus, 0);
		}
	}
	private void populateList(List listToPopulate, IStatus buildingStatus, int nesting) {
		if (!buildingStatus.matches(displayMask)) {
			return;
		}
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < nesting; i++) {
			sb.append(NESTING_INDENT); //$NON-NLS-1$
		}
		sb.append(buildingStatus.getMessage());
		listToPopulate.add(sb.toString());
		IStatus[] children = buildingStatus.getChildren();
		for (int i = 0; i < children.length; i++) {
			populateList(listToPopulate, children[i], nesting + 1);
		}
	}
	/**
	 * Returns whether the given status object should be displayed.
	 * 
	 * @param status
	 *            a status object
	 * @param mask
	 *            a mask as per <code>IStatus.matches</code>
	 * @return <code>true</code> if the given status should be displayed, and
	 *         <code>false</code> otherwise
	 * @see org.eclipse.core.runtime.IStatus#matches(int)
	 */
	protected static boolean shouldDisplay(IStatus status, int mask) {
		IStatus[] children = status.getChildren();
		if (children == null || children.length == 0) {
			return status.matches(mask);
		}
		for (int i = 0; i < children.length; i++) {
			if (children[i].matches(mask))
				return true;
		}
		return false;
	}
	/**
	 * Toggles the unfolding of the details area. This is triggered by the user
	 * pressing the details button.
	 */
	private void toggleDetailsArea() {
		Point windowSize = getShell().getSize();
		Point oldSize = getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT);
		if (listCreated) {
			list.dispose();
			listCreated = false;
			detailsButton.setText(IDialogConstants.SHOW_DETAILS_LABEL);
		} else {
			list = createDropDownList((Composite) getContents());
			detailsButton.setText(IDialogConstants.HIDE_DETAILS_LABEL);
		}
		Point newSize = getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT);
		getShell()
				.setSize(
						new Point(windowSize.x, windowSize.y
								+ (newSize.y - oldSize.y)));
	}
	/**
	 * Put the details of the status of the error onto the stream.
	 * 
	 * @param buildingStatus
	 * @param buffer
	 * @param nesting
	 */
	private void populateCopyBuffer(IStatus buildingStatus, StringBuffer buffer,
			int nesting) {
		if (!buildingStatus.matches(displayMask)) {
			return;
		}
		for (int i = 0; i < nesting; i++) {
			buffer.append(NESTING_INDENT); //$NON-NLS-1$
		}
		buffer.append(buildingStatus.getMessage());
		buffer.append("\n"); //$NON-NLS-1$
		IStatus[] children = buildingStatus.getChildren();
		for (int i = 0; i < children.length; i++) {
			populateCopyBuffer(children[i], buffer, nesting + 1);
		}
	}
	/**
	 * Copy the contents of the statuses to the clipboard.
	 */
	private void copyToClipboard() {
		if (clipboard != null)
			clipboard.dispose();
		StringBuffer statusBuffer = new StringBuffer();
		populateCopyBuffer(status, statusBuffer, 0);
		clipboard = new Clipboard(list.getDisplay());
		clipboard.setContents(new Object[]{statusBuffer.toString()},
				new Transfer[]{TextTransfer.getInstance()});
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#close()
	 */
	public boolean close() {
		if (clipboard != null)
			clipboard.dispose();
		return super.close();
	}
}