/*******************************************************************************
 * Copyright (c) 2000, 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
 *******************************************************************************/
package org.eclipse.ui.internal.dialogs;

import java.util.Arrays;
import java.util.HashSet;

import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.IPreferenceConstants;
import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
import org.eclipse.ui.internal.Workbench;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.internal.util.PrefUtil;
import org.osgi.framework.Constants;

/**
 * The Startup preference page.
 */
public class StartupPreferencePage extends PreferencePage implements
        IWorkbenchPreferencePage {
    private Table pluginsList;

    private Workbench workbench;

    /**
     * @see PreferencePage#createContents(Composite)
     */
    protected Control createContents(Composite parent) {
    	PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
				IWorkbenchHelpContextIds.STARTUP_PREFERENCE_PAGE);

        Composite composite = createComposite(parent);

        createEarlyStartupSelection(composite);

        return composite;
    }

    protected Composite createComposite(Composite parent) {
        Composite composite = new Composite(parent, SWT.NULL);
        GridLayout layout = new GridLayout();
        layout.marginWidth = 0;
        layout.marginHeight = 0;
        composite.setLayout(layout);
        GridData data = new GridData(GridData.FILL_BOTH
                | GridData.VERTICAL_ALIGN_FILL | GridData.HORIZONTAL_ALIGN_FILL);
        composite.setLayoutData(data);
        composite.setFont(parent.getFont());

        return composite;
    }

    protected void createEarlyStartupSelection(Composite parent) {
        Label label = new Label(parent, SWT.NONE);
        label.setText(WorkbenchMessages.StartupPreferencePage_label);
        label.setFont(parent.getFont());
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        label.setLayoutData(data);
        pluginsList = new Table(parent, SWT.BORDER | SWT.CHECK | SWT.H_SCROLL
                | SWT.V_SCROLL);
        data = new GridData(GridData.FILL_BOTH);
        pluginsList.setFont(parent.getFont());
        pluginsList.setLayoutData(data);
        populatePluginsList();
    }

    private void populatePluginsList() {
        String pluginIds[] = workbench.getEarlyActivatedPlugins();
        HashSet disabledPlugins = new HashSet(Arrays.asList(workbench.getDisabledEarlyActivatedPlugins()));
        for (int i = 0; i < pluginIds.length; i++) {
            String pluginId = pluginIds[i];
            TableItem item = new TableItem(pluginsList, SWT.NONE);
            item.setText((String) Platform.getBundle(pluginId).getHeaders().get(
                    Constants.BUNDLE_NAME));
            item.setData(pluginId);
            item.setChecked(!disabledPlugins.contains(pluginId));
        }
    }

    /**
     * @see IWorkbenchPreferencePage
     */
    public void init(IWorkbench workbench) {
        this.workbench = (Workbench) workbench;
    }

    /**
     * @see PreferencePage
     */
    protected void performDefaults() {
        TableItem items[] = pluginsList.getItems();
        for (int i = 0; i < items.length; i++) {
            items[i].setChecked(true);
        }
    }

    /**
     * @see PreferencePage
     */
    public boolean performOk() {
        StringBuffer preference = new StringBuffer();
        TableItem items[] = pluginsList.getItems();
        for (int i = 0; i < items.length; i++) {
            if (!items[i].getChecked()) {
                preference.append((String) items[i].getData());
                preference.append(IPreferenceConstants.SEPARATOR);
            }
        }
        String pref = preference.toString();
        IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
        store.putValue(IPreferenceConstants.PLUGINS_NOT_ACTIVATED_ON_STARTUP,
                pref);
        PrefUtil.savePrefs();
        return true;
    }
}