/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * 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:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

package org.eclipse.birt.report.designer.internal.ui.views.attributes.provider;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.birt.report.designer.internal.ui.dialogs.UserPropertyBuilder;
import org.eclipse.birt.report.designer.nls.Messages;
import org.eclipse.birt.report.model.api.DesignElementHandle;
import org.eclipse.birt.report.model.api.Expression;
import org.eclipse.birt.report.model.api.activity.NotificationEvent;
import org.eclipse.birt.report.model.api.command.UserPropertyEvent;
import org.eclipse.birt.report.model.api.core.UserPropertyDefn;
import org.eclipse.birt.report.model.metadata.PropertyType;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Table;

/**
 * 
 */

public class NamedExpressionsHandleProvier extends AbstractFormHandleProvider
{

	private static final int[] COLUMN_WIDTHS = new int[]{
			250, 300
	};
	private static final String[] COLUMNS = new String[]{
			Messages.getString( "NamedExpressionsHandleProvier.Column.Name" ), Messages.getString( "NamedExpressionsHandleProvier.Column.DefaultValue" ) //$NON-NLS-1$ //$NON-NLS-2$
	};
	private static final String TITLE = Messages.getString( "ReportPageGenerator.List.NamedExpressions" ); //$NON-NLS-1$

	private DesignElementHandle inputElement;

	public String[] getColumnNames( )
	{
		return COLUMNS;
	}

	public int[] getColumnWidths( )
	{
		return COLUMN_WIDTHS;
	}

	public String getDisplayName( )
	{
		return TITLE;
	}

	public CellEditor[] getEditors( Table table )
	{
		return null;
	}

	public boolean doMoveItem( int oldPos, int newPos ) throws Exception
	{
		return false;
	}

	public boolean doDeleteItem( int pos ) throws Exception
	{
		inputElement.dropUserPropertyDefn( ( (UserPropertyDefn) getElements( inputElement )[pos] ).getName( ) );
		return true;
	}

	public boolean doAddItem( int pos ) throws Exception
	{
		UserPropertyBuilder builder = new UserPropertyBuilder( UserPropertyBuilder.NAMED_EXPRESSION );
		builder.setInput( inputElement );
		if ( builder.open( ) == Dialog.OK )
		{
			inputElement.addUserPropertyDefn( (UserPropertyDefn) builder.getResult( ) );
			return true;
		}
		return false;
	}

	public boolean doEditItem( int pos )
	{
		return false;
	}

	public String getColumnText( Object element, int columnIndex )
	{
		UserPropertyDefn def = (UserPropertyDefn) element;
		if ( columnIndex == 0 )
		{
			return def.getName( );
		}
		Object defaultValue = def.getDefault( );
		if ( defaultValue instanceof Expression )
			return ( (Expression) defaultValue ).getStringExpression( );
		else if ( defaultValue instanceof String )
			return (String) defaultValue;
		return null;
	}

	public Image getImage( Object element, int columnIndex )
	{
		return null;
	}

	public Object[] getElements( Object inputElement )
	{
		if ( inputElement instanceof List )
		{
			inputElement = ( (List) inputElement ).get( 0 );
		}
		if ( inputElement instanceof DesignElementHandle )
		{
			this.inputElement = (DesignElementHandle) inputElement;
			ArrayList list = new ArrayList( );
			for ( Iterator iter = ( (DesignElementHandle) inputElement ).getUserProperties( )
					.iterator( ); iter.hasNext( ); )
			{
				UserPropertyDefn def = (UserPropertyDefn) iter.next( );
				if ( def.getType( )
						.getName( )
						.equals( PropertyType.EXPRESSION_TYPE_NAME ) )
				{
					list.add( def );
				}
			}
			return list.toArray( );
		}
		return null;
	}

	public boolean canModify( Object element, String property )
	{
		return true;
	}

	public Object getValue( Object element, String property )
	{
		return null;
	}

	public boolean modify( Object data, String property, Object value )
			throws Exception
	{
		return false;
	}

	public boolean needRefreshed( NotificationEvent event )
	{
		if ( event instanceof UserPropertyEvent )
		{
			return true;
		}
		return false;
	}

}
