/*******************************************************************************
 * Copyright (c) 2005-2008 Polarion Software.
 * 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:
 *    Igor Burilo - Initial API and implementation
 *******************************************************************************/

package org.eclipse.team.svn.ui.preferences;

import org.eclipse.jface.preference.IPreferenceStore;
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.team.svn.core.operation.local.DiffViewerSettings;
import org.eclipse.team.svn.core.operation.local.DiffViewerSettings.ResourceSpecificParameters;
import org.eclipse.team.svn.core.utility.FileUtility;
import org.eclipse.team.svn.ui.SVNTeamUIPlugin;
import org.eclipse.team.svn.ui.SVNUIMessages;
import org.eclipse.team.svn.ui.composite.DiffViewerFileAssociationsComposite;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;

/**
 * Diff Viewer preference page
 * 
 * @author Igor Burilo
 */
public class SVNTeamDiffViewerPage extends AbstractSVNTeamPreferencesPage {
	
	protected DiffViewerFileAssociationsComposite fileAssociationsComposite;
	
	protected DiffViewerSettings diffSettings;
	
	public void init(IWorkbench workbench) {
		this.setDescription(SVNUIMessages.SVNTeamDiffViewerPage_Description);
	}
	
	protected Control createContentsImpl(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = layout.marginWidth = 0;
		layout.numColumns = 1;
		GridData data = new GridData(GridData.FILL_BOTH);
		composite.setLayoutData(data);
		composite.setLayout(layout);						
                                                		
		this.fileAssociationsComposite = new DiffViewerFileAssociationsComposite(composite, this);		
		
		//Setting context help
		PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, "org.eclipse.team.svn.help.diffViewerPreferencesContext"); //$NON-NLS-1$
		
		return composite;
	}
	
	protected void initializeControls() {
		this.fileAssociationsComposite.initializeControls(this.diffSettings);				
	}

	protected void loadDefaultValues(IPreferenceStore store) {
		this.diffSettings = DiffViewerSettings.getDefaultDiffViewerSettings();				
	}

	protected void loadValues(IPreferenceStore store) {
		this.diffSettings = SVNTeamDiffViewerPage.loadDiffViewerSettings(store);
	}
	
	protected void saveValues(IPreferenceStore store) {
		SVNTeamDiffViewerPage.saveDiffViewerSettings(this.diffSettings, store);
	}
	
	public static DiffViewerSettings loadDiffViewerSettings() {
		return SVNTeamDiffViewerPage.loadDiffViewerSettings(SVNTeamUIPlugin.instance().getPreferenceStore());
	}
	
	public static DiffViewerSettings loadDiffViewerSettings(IPreferenceStore store) {
		DiffViewerSettings diffSettings = new DiffViewerSettings();
		
		String encodedString = SVNTeamPreferences.getDiffViewerString(store, SVNTeamPreferences.DIFF_VIEWER_RESOURCES_SPECIFIC_PARAMETERS);
		String[] stringArray = FileUtility.decodeStringToArray(encodedString);
		if (stringArray.length > 0 && stringArray.length % ResourceSpecificParameters.FIELDS_COUNT == 0) {
			int paramsCount = stringArray.length / ResourceSpecificParameters.FIELDS_COUNT;
			for (int i = 0; i < paramsCount; i ++) {
				String[] strings = new String[ResourceSpecificParameters.FIELDS_COUNT];
				for (int j = 0; j < ResourceSpecificParameters.FIELDS_COUNT; j ++) {
					strings[j] = stringArray[i * ResourceSpecificParameters.FIELDS_COUNT + j]; 
				}
				ResourceSpecificParameters param = ResourceSpecificParameters.createFromStrings(strings);
				if (param != null) {
					diffSettings.addResourceSpecificParameters(param);	
				}				
			}
		}	
		
		return diffSettings;
	}
	
	public static void saveDiffViewerSettings(DiffViewerSettings diffSettings, IPreferenceStore store) {
		SVNTeamDiffViewerPage.saveDiffViewerSettings(diffSettings, store, false);
	}
	
	public static void saveDiffViewerSettings(DiffViewerSettings diffSettings, IPreferenceStore store, boolean isDefault) {
		ResourceSpecificParameters[] resourceParams = diffSettings.getResourceSpecificParameters();
		if (resourceParams.length > 0) {
			String[] stringArray = new String[ResourceSpecificParameters.FIELDS_COUNT * resourceParams.length];
			for (int i = 0; i < resourceParams.length; i ++) {
				ResourceSpecificParameters resourceParam = resourceParams[i];
				String[] strings = resourceParam.getAsStrings();
				System.arraycopy(strings, 0, stringArray, ResourceSpecificParameters.FIELDS_COUNT * i, strings.length);
			}	
			String encodedString = FileUtility.encodeArrayToString(stringArray);
			SVNTeamPreferences.setDiffViewerString(store, SVNTeamPreferences.DIFF_VIEWER_RESOURCES_SPECIFIC_PARAMETERS, encodedString, isDefault);
		} else {
			SVNTeamPreferences.setDiffViewerString(store, SVNTeamPreferences.DIFF_VIEWER_RESOURCES_SPECIFIC_PARAMETERS, "", isDefault); //$NON-NLS-1$
		}
	}
}