/*******************************************************************************
 * Copyright (c) 2002, 2005 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.xml.ui.internal.catalog;

import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.eclipse.wst.xml.core.internal.XMLCorePlugin;
import org.eclipse.wst.xml.core.internal.catalog.CatalogSet;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalog;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalogEntry;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalogEvent;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalogListener;
import org.eclipse.wst.xml.core.internal.catalog.provisional.INextCatalog;

public class XMLCatalogPreferencePage extends PreferencePage implements
        IWorkbenchPreferencePage, ICatalogListener
{

    protected XMLCatalogEntriesView catalogEntriesView;

    protected ICatalog workingUserCatalog;

    protected ICatalog systemCatalog;

    protected ICatalog userCatalog;

    protected ICatalog defaultCatalog;

    protected Button advancedButton;

    public XMLCatalogPreferencePage()
    {
        defaultCatalog = XMLCorePlugin.getDefault().getDefaultXMLCatalog();
        INextCatalog[] nextCatalogs = defaultCatalog.getNextCatalogs();
        for (int i = 0; i < nextCatalogs.length; i++)
        {
            INextCatalog catalog = nextCatalogs[i];
            ICatalog referencedCatalog = catalog.getReferencedCatalog();
            if (referencedCatalog != null)
            {
                if (XMLCorePlugin.SYSTEM_CATALOG_ID
                        .equals(referencedCatalog.getId()))
                {
                    systemCatalog = referencedCatalog;
                } else if (XMLCorePlugin.USER_CATALOG_ID
                        .equals(referencedCatalog.getId()))
                {
                    userCatalog = referencedCatalog;
                }
            }
        }
    }

    public void dispose()
    {
        super.dispose();
        workingUserCatalog.removeListener(this);
    }

    /**
     * Refresh the view in responce to an event sent by the Catalog
     */
    public void catalogChanged(ICatalogEvent event)
    {
        catalogEntriesView.updatePage();
    }

    /**
     * Creates preference page controls on demand.
     * 
     * @param parent
     *            the parent for the preference page
     */
    protected Control createContents(Composite parent)
    {
        // we create a working copy of the 'User Settings' for the Catalog
        // that we can modify
        CatalogSet tempCatalogSet = new CatalogSet(); 
        workingUserCatalog = tempCatalogSet.lookupOrCreateCatalog("working", ""); //$NON-NLS-1$ //$NON-NLS-2$
        
        // TODO: add entries from the nested catalogs as well
        workingUserCatalog.addEntriesFromCatalog(userCatalog);
        workingUserCatalog.addListener(this);
        noDefaultAndApplyButton();
        Composite composite = new Composite(parent, SWT.NULL);
        // WorkbenchHelp.setHelp(composite, new
        // ControlContextComputer(composite,
        // XMLBuilderContextIds.XMLP_CATALOG_PAGE));
        composite.setLayout(new GridLayout());
        composite.setLayoutData(new GridData(GridData.FILL_BOTH));
        createCatalogEntriesView(composite);
        createCatalogDetailsView(composite);
        createAdvancedButton(composite);
        // catalogEntriesView.updatePage();
        applyDialogFont(composite);
        
        return composite;
    }

    protected void createAdvancedButton(Composite composite)
    {
        Composite panel = new Composite(composite, SWT.NONE);
        GridLayout gridLayout = new GridLayout();
        gridLayout.numColumns = 3;
        panel.setLayout(gridLayout);
        panel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        // TODO... is there a better way to expand the page width?
        // This invisible label is created to force the width of the page to be
        // wide enough to show
        // the rather long uri and key fields of a catalog entry.
        Label widthFudger = new Label(panel, SWT.NONE);
        String widthFudgerString = ""; //$NON-NLS-1$
        for (int i = 0; i < 55; i++)
        {
            widthFudgerString += "x"; //$NON-NLS-1$
        }
        widthFudger.setText(widthFudgerString);
        widthFudger.setVisible(false);
        Composite placeHolder = new Composite(panel, SWT.NONE);
        placeHolder.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        advancedButton = new Button(panel, SWT.NONE);
        advancedButton.setText(XMLCatalogMessages.UI_LABEL_ADVANCED);
        SelectionListener selectionListener = new SelectionAdapter()
        {
            public void widgetSelected(SelectionEvent e)
            {
                AdvancedOptionsDialog dialog = new AdvancedOptionsDialog(
                        getShell(), workingUserCatalog);
                dialog.create();
                dialog
                        .getShell()
                        .setText(
                                XMLCatalogMessages.UI_LABEL_ADVANCED_XML_CATALOG_PREFS);
                dialog.setBlockOnOpen(true);
                dialog.open();
            }
        };
        advancedButton.addSelectionListener(selectionListener);
    }

    public boolean isSameFileName(String a, String b)
    {
        boolean result = false;
        if (a == null && b == null)
        {
            result = true;
        } else if (a != null && b != null)
        {
            result = a.equals(b);
        }
        return result;
    }

    protected void createCatalogEntriesView(Composite parent)
    {
        Group group = new Group(parent, SWT.NONE);
        group.setLayout(new GridLayout());
        group.setLayoutData(new GridData(GridData.FILL_BOTH));
        group.setText(XMLCatalogMessages.UI_LABEL_USER_ENTRIES);
        group.setToolTipText(XMLCatalogMessages.UI_LABEL_USER_ENTRIES_TOOL_TIP);
        // WorkbenchHelp.setHelp(userEntriesGroup, new
        // ControlContextComputer(userEntriesGroup,
        // XMLBuilderContextIds.XMLP_CATALOG_USER_GROUP));
        catalogEntriesView = new XMLCatalogEntriesView(group,
                workingUserCatalog, systemCatalog);
        catalogEntriesView.setLayoutData(new GridData(GridData.FILL_BOTH));
    }

    protected void createCatalogDetailsView(Composite parent)
    {
        Group detailsGroup = new Group(parent, SWT.NONE);
        detailsGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        detailsGroup.setLayout(new GridLayout());
        detailsGroup.setText(XMLCatalogMessages.UI_LABEL_DETAILS);
        final XMLCatalogEntryDetailsView detailsView = new XMLCatalogEntryDetailsView(
                detailsGroup);
        ISelectionChangedListener listener = new ISelectionChangedListener()
        {
            public void selectionChanged(SelectionChangedEvent event)
            {
                ISelection selection = event.getSelection();
                Object selectedObject = (selection instanceof IStructuredSelection) ? ((IStructuredSelection) selection)
                        .getFirstElement()
                        : null;
                if (selectedObject instanceof ICatalogEntry)
                {
                    ICatalogEntry entry = (ICatalogEntry) selectedObject;
                    detailsView.setCatalogElement(entry);
                }
                else if (selectedObject instanceof INextCatalog)
                {
                	INextCatalog entry = (INextCatalog) selectedObject;
                    detailsView.setCatalogElement(entry);
                }
                else {
                	detailsView.setCatalogElement((ICatalogEntry) null); 
                }
                
            }
        };
        catalogEntriesView.getViewer().addSelectionChangedListener(listener);
    }

    /**
     * Do anything necessary because the OK button has been pressed.
     * 
     * @return whether it is okay to close the preference page
     */
    public boolean performOk()
    {
        return storeValues();
    }

    /**
     * @see IWorkbenchPreferencePage
     */
    public void init(IWorkbench workbench)
    {
    }

    /**
     * Stores the values of the controls back to the preference store.
     */
    private boolean storeValues()
    {
       //dw  Object fileObject = null;
        try
        {
            // update the userCatalog so that its the same as the working
            // catalog
            userCatalog.clear();
            // TODO add entries from the nested catalogs?
            userCatalog.addEntriesFromCatalog(workingUserCatalog);
            // now save the userCatalog
            userCatalog.save();
        } catch (Exception e)
        {
        }
        return true;
    }
    
	
}