 /****************************************************************************
 * 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.ide.dialogs;

import java.util.Collections;
import java.util.List;

import org.eclipse.core.resources.IWorkspaceDescription;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.Preferences;
import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.IntegerFieldEditor;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
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.Label;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.WorkbenchEncoding;
import org.eclipse.ui.dialogs.PreferenceLinkArea;
import org.eclipse.ui.ide.IDEEncoding;
import org.eclipse.ui.ide.dialogs.ResourceEncodingFieldEditor;
import org.eclipse.ui.internal.ide.IDEInternalPreferences;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.ide.IIDEHelpContextIds;
import org.eclipse.ui.internal.ide.LineDelimiterEditor;
import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;

/**
 * The IDEWorkspacePreferencePage is the page used to set IDE-specific preferences settings
 * related to workspace.

 *Note:This class extends from PreferencePage,and there's no WorkspacePreferencePage class.
 *Hence when the IDE settings doesn't appear in this preference page, this page will be empty.
 */
public class IDEWorkspacePreferencePage extends PreferencePage
        implements IWorkbenchPreferencePage{

	private Button autoBuildButton;

    private Button autoSaveAllButton;

    private IntegerFieldEditor saveInterval;

    private Button autoRefreshButton;
    
    private ResourceEncodingFieldEditor encodingEditor;

	private LineDelimiterEditor lineSeparatorEditor;
	
    //A boolean to indicate if the user settings were cleared.
	private boolean clearUserSettings = false;

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.jface.preference.PreferencePage
     */
    protected Control createContents(Composite parent) {

    	PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
				IIDEHelpContextIds.WORKSPACE_PREFERENCE_PAGE);

        Composite composite = createComposite(parent);

		PreferenceLinkArea area = new PreferenceLinkArea(composite, SWT.NONE,
				"org.eclipse.ui.preferencePages.Startup", IDEWorkbenchMessages.IDEWorkspacePreferencePage_WorkbenchPreference_relatedLink,//$NON-NLS-1$
				(IWorkbenchPreferenceContainer) getContainer(),null);

		GridData data = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
		area.getControl().setLayoutData(data);
        
		Label space = new Label(composite,SWT.NONE);
		space.setLayoutData(new GridData());
		
        createAutoBuildPref(composite);
        createSaveAllBeforeBuildPref(composite);
        
        createSpace(composite);
        createSaveIntervalGroup(composite);
		createSpace(composite);
		createAutoRefreshControls(composite);
		
		Composite lower = new Composite(composite,SWT.NONE);
		GridLayout lowerLayout = new GridLayout();
		lowerLayout.numColumns = 2;
		lowerLayout.makeColumnsEqualWidth = true;
		lower.setLayout(lowerLayout);
		
		lower.setLayoutData(new GridData(
                GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
		
		createEncodingEditorControls(lower);
		createLineSeparatorEditorControls(lower);
		applyDialogFont(composite);

        return composite;
    }

    protected void createSaveAllBeforeBuildPref(Composite composite) {
        autoSaveAllButton = new Button(composite, SWT.CHECK);
        autoSaveAllButton.setText(IDEWorkbenchMessages.IDEWorkspacePreference_savePriorToBuilding);
        autoSaveAllButton.setToolTipText(IDEWorkbenchMessages.IDEWorkspacePreference_savePriorToBuildingToolTip);
        autoSaveAllButton.setSelection(getIDEPreferenceStore().getBoolean(
                IDEInternalPreferences.SAVE_ALL_BEFORE_BUILD));
    }

    protected void createAutoBuildPref(Composite composite) {
        autoBuildButton = new Button(composite, SWT.CHECK);
        autoBuildButton.setText(IDEWorkbenchMessages.IDEWorkspacePreference_autobuild);
        autoBuildButton.setToolTipText(IDEWorkbenchMessages.IDEWorkspacePreference_autobuildToolTip);
        autoBuildButton.setSelection(ResourcesPlugin.getWorkspace()
                .isAutoBuilding());
    }

    /**
     * Create a composite that contains entry fields specifying save interval
     * preference.
     * 
     * @param composite the Composite the group is created in.
     */
    private void createSaveIntervalGroup(Composite composite) {
        Composite groupComposite = new Composite(composite, SWT.LEFT);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        groupComposite.setLayout(layout);
        GridData gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.grabExcessHorizontalSpace = true;
        groupComposite.setLayoutData(gd);

        saveInterval = new IntegerFieldEditor(
                IDEInternalPreferences.SAVE_INTERVAL, IDEWorkbenchMessages.WorkbenchPreference_saveInterval,
                groupComposite);

        // @issue we should drop our preference constant and let clients use
        // core's pref. ours is not up-to-date anyway if someone changes this
        // interval directly thru core api.
        saveInterval.setPreferenceStore(getIDEPreferenceStore());
        saveInterval.setPage(this);
        saveInterval.setTextLimit(Integer.toString(
                IDEInternalPreferences.MAX_SAVE_INTERVAL).length());
        saveInterval.setErrorMessage(NLS.bind(IDEWorkbenchMessages.WorkbenchPreference_saveIntervalError, new Integer(IDEInternalPreferences.MAX_SAVE_INTERVAL)));
        saveInterval
                .setValidateStrategy(StringFieldEditor.VALIDATE_ON_KEY_STROKE);
        saveInterval.setValidRange(1, IDEInternalPreferences.MAX_SAVE_INTERVAL);

        IWorkspaceDescription description = ResourcesPlugin.getWorkspace()
                .getDescription();
        long interval = description.getSnapshotInterval() / 60000;
        saveInterval.setStringValue(Long.toString(interval));

        saveInterval.setPropertyChangeListener(new IPropertyChangeListener() {

            public void propertyChange(PropertyChangeEvent event) {
                if (event.getProperty().equals(FieldEditor.IS_VALID))
                    setValid(saveInterval.isValid());
            }
        });

    }
	
	/**
     * Create the Refresh controls
     * 
     * @param parent
     */
    private void createAutoRefreshControls(Composite parent) {

        this.autoRefreshButton = new Button(parent, SWT.CHECK);
        this.autoRefreshButton.setText(IDEWorkbenchMessages.IDEWorkspacePreference_RefreshButtonText);
        this.autoRefreshButton.setToolTipText(IDEWorkbenchMessages.IDEWorkspacePreference_RefreshButtonToolTip);

        boolean autoRefresh = ResourcesPlugin.getPlugin()
                .getPluginPreferences().getBoolean(
                        ResourcesPlugin.PREF_AUTO_REFRESH);
        this.autoRefreshButton.setSelection(autoRefresh);
    }

    /**
     * Create a composite that contains the encoding controls
     * 
     * @param parent
     */
    private void createEncodingEditorControls(Composite parent){    			
		Composite encodingComposite = new Composite(parent,SWT.NONE);
		encodingComposite.setLayout(new GridLayout());
		encodingComposite.setLayoutData(new GridData(
                GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
		
		encodingEditor = new ResourceEncodingFieldEditor(IDEWorkbenchMessages.WorkbenchPreference_encoding, encodingComposite, ResourcesPlugin
				.getWorkspace().getRoot());

		encodingEditor.setPage(this);
		encodingEditor.load();
		encodingEditor.setPropertyChangeListener(new IPropertyChangeListener() {
			/* (non-Javadoc)
			 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
			 */
			public void propertyChange(PropertyChangeEvent event) {
				if (event.getProperty().equals(FieldEditor.IS_VALID))
					 setValid(encodingEditor.isValid());

			}
		});
    }
    
    /**
     * Create a composite that contains the line delimiter controls
     * 
     * @param parent
     */
    private void createLineSeparatorEditorControls(Composite parent){
    	Composite lineComposite = new Composite(parent,SWT.NONE);
		lineComposite.setLayout(new GridLayout());
		lineComposite.setLayoutData(new GridData(
                GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
		
		lineSeparatorEditor = new LineDelimiterEditor(lineComposite);
		lineSeparatorEditor.doLoad();
    }
    /**
     * Returns the IDE preference store.
     * @return the preference store.
     */
    protected IPreferenceStore getIDEPreferenceStore() {
        return IDEWorkbenchPlugin.getDefault().getPreferenceStore();
    }
	
	/**
     * Creates a tab of one horizontal spans.
     * 
     * @param parent
     *            the parent in which the tab should be created
     */
    protected static void createSpace(Composite parent) {
        Label vfiller = new Label(parent, SWT.LEFT);
        GridData gridData = new GridData();
        gridData = new GridData();
        gridData.horizontalAlignment = GridData.BEGINNING;
        gridData.grabExcessHorizontalSpace = false;
        gridData.verticalAlignment = GridData.CENTER;
        gridData.grabExcessVerticalSpace = false;
        vfiller.setLayoutData(gridData);
    }

	/**
     * Creates the composite which will contain all the preference controls for
     * this page.
     * 
     * @param parent
     *            the parent composite
     * @return the composite for this page
     */
    protected Composite createComposite(Composite parent) {
        Composite composite = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.marginWidth = 0;
        layout.marginHeight = 0;
        composite.setLayout(layout);
        composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL
                | GridData.HORIZONTAL_ALIGN_FILL));
        return composite;
    }
	
	public void init(org.eclipse.ui.IWorkbench workbench) {
        //no-op
    }
    
    /**
     * The default button has been pressed.
     */
    protected void performDefaults() {

        // core holds onto this preference.
        boolean autoBuild = ResourcesPlugin.getPlugin().getPluginPreferences()
                .getDefaultBoolean(ResourcesPlugin.PREF_AUTO_BUILDING);
        autoBuildButton.setSelection(autoBuild);

        IPreferenceStore store = getIDEPreferenceStore();
        autoSaveAllButton
                .setSelection(store
                        .getDefaultBoolean(IDEInternalPreferences.SAVE_ALL_BEFORE_BUILD));
        saveInterval.loadDefault();

		
        boolean autoRefresh = ResourcesPlugin.getPlugin()
                .getPluginPreferences().getDefaultBoolean(
                        ResourcesPlugin.PREF_AUTO_REFRESH);
        autoRefreshButton.setSelection(autoRefresh);
        
        clearUserSettings = true;

		List encodings = WorkbenchEncoding.getDefinedEncodings();
		Collections.sort(encodings);
        encodingEditor.loadDefault();
		lineSeparatorEditor.loadDefault();

        super.performDefaults();
    }

    /**
     * The user has pressed Ok. Store/apply this page's values appropriately.
     */
    public boolean performOk() {
        // set the workspace auto-build flag
        IWorkspaceDescription description = ResourcesPlugin.getWorkspace()
                .getDescription();
        if (autoBuildButton.getSelection() != ResourcesPlugin.getWorkspace()
                .isAutoBuilding()) {
            try {
                description.setAutoBuilding(autoBuildButton.getSelection());
                ResourcesPlugin.getWorkspace().setDescription(description);
            } catch (CoreException e) {
                IDEWorkbenchPlugin.log(
                        "Error changing auto build workspace setting.", e//$NON-NLS-1$
                                .getStatus());
            }
        }

        IPreferenceStore store = getIDEPreferenceStore();

        // store the save all prior to build setting
        store.setValue(IDEInternalPreferences.SAVE_ALL_BEFORE_BUILD,
                autoSaveAllButton.getSelection());

        // store the workspace save interval
        // @issue we should drop our preference constant and let clients use
        // core's pref. ours is not up-to-date anyway if someone changes this
        // interval directly thru core api.
        long oldSaveInterval = description.getSnapshotInterval() / 60000;
        long newSaveInterval = new Long(saveInterval.getStringValue())
                .longValue();
        if (oldSaveInterval != newSaveInterval) {
            try {
                description.setSnapshotInterval(newSaveInterval * 60000);
                ResourcesPlugin.getWorkspace().setDescription(description);
                store.firePropertyChangeEvent(
                        IDEInternalPreferences.SAVE_INTERVAL, new Integer(
                                (int) oldSaveInterval), new Integer(
                                (int) newSaveInterval));
            } catch (CoreException e) {
                IDEWorkbenchPlugin.log(
                        "Error changing save interval preference", e //$NON-NLS-1$
                                .getStatus());
            }
        }
        
        Preferences preferences = ResourcesPlugin.getPlugin()
                .getPluginPreferences();

        boolean autoRefresh = autoRefreshButton.getSelection();
        preferences.setValue(ResourcesPlugin.PREF_AUTO_REFRESH, autoRefresh);
        
        if (clearUserSettings)
			IDEEncoding.clearUserEncodings();
        encodingEditor.store();
		lineSeparatorEditor.store();
        return super.performOk();
    }

}