/*******************************************************************************
 * 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.ui.actions;

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

import org.eclipse.birt.report.designer.core.model.SessionHandleAdapter;
import org.eclipse.birt.report.designer.core.model.schematic.HandleAdapterFactory;
import org.eclipse.birt.report.designer.core.util.mediator.request.ReportRequest;
import org.eclipse.birt.report.designer.data.ui.dataset.DataSetEditor;
import org.eclipse.birt.report.designer.data.ui.dataset.JointDataSetWizard;
import org.eclipse.birt.report.designer.internal.ui.util.Policy;
import org.eclipse.birt.report.designer.nls.Messages;
import org.eclipse.birt.report.model.api.DataSetHandle;
import org.eclipse.birt.report.model.api.ScriptDataSetHandle;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.window.Window;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.ui.PlatformUI;

/**
 * New Joint dataset action for creating joint dataset from two datasets
 * Preferences - Java - Code Style - Code Templates
 */
public class NewJointDataSetAction extends Action
{

	public static final String ID = "org.eclipse.birt.report.designer.ui.actions.NewJointDataSetAction"; //$NON-NLS-1$
	private DataSetHandle dataSetHandle;

	/**
	 * 
	 */
	public NewJointDataSetAction( )
	{
		super( );
		setId( ID );
	}

	/**
	 * @param text
	 */
	public NewJointDataSetAction( String text )
	{
		super( text );
		setId( ID );
	}

	/**
	 * @param text
	 * @param style
	 */
	public NewJointDataSetAction( String text, int style )
	{
		super( text, style );
		setId( ID );
	}

	/**
	 * @param text
	 * @param image
	 */
	public NewJointDataSetAction( String text, ImageDescriptor image )
	{
		super( text, image );
		setId( ID );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.IAction#run()
	 */
	public void run( )
	{
		if ( Policy.TRACING_ACTIONS )
		{
			System.out.println( "New joint data set action >> Run ..." ); //$NON-NLS-1$
		}

		// Get the list of data sets before inserting a new Data Set
		List existingDataSets = getDataSets( );

		// Check if data sets are available
		if ( existingDataSets.isEmpty( ) )
		{
			MessageDialog.openError( PlatformUI.getWorkbench( )
					.getDisplay( )
					.getActiveShell( ),
					Messages.getString( "JointDataSetPage.error.nodataset.title" ), Messages.getString( "JointDataSetPage.error.nodataset.title" ) );//$NON-NLS-1$ //$NON-NLS-2$
			notifyResult( false );
		}
		else
		{
			HandleAdapterFactory.getInstance( )
					.getReportDesignHandleAdapter( )
					.getModuleHandle( )
					.getCommandStack( )
					.startPersistentTrans( Messages.getString( "dataset.message.create" ) );

			JointDataSetWizard wizard = new JointDataSetWizard( );
			wizard.setWindowTitle( Messages.getString( "dataset.new" ) );//$NON-NLS-1$
			WizardDialog dialog = new WizardDialog( PlatformUI.getWorkbench( )
					.getDisplay( )
					.getActiveShell( ), wizard );

			if ( dialog.open( ) == WizardDialog.OK )
			{
				// Get the list of data sets after inserting a new Data Set
				List newDataSets = getDataSets( );

				editDataSet( existingDataSets, newDataSets );

				HandleAdapterFactory.getInstance( )
						.getReportDesignHandleAdapter( )
						.getModuleHandle( )
						.getCommandStack( )
						.commit( );

				ReportRequest request = new ReportRequest( ReportRequest.CREATE_ELEMENT );
				List selectionObjects = new ArrayList( );
				selectionObjects.add( dataSetHandle );
				request.setSelectionObject( selectionObjects );
				SessionHandleAdapter.getInstance( )
						.getMediator( )
						.notifyRequest( request );

				notifyResult( true );
			}

			else
			{
				HandleAdapterFactory.getInstance( )
						.getReportDesignHandleAdapter( )
						.getModuleHandle( )
						.getCommandStack( )
						.rollback( );
				notifyResult( false );
			}
		}
	}

	private List getDataSets( )
	{

		List dataSets = HandleAdapterFactory.getInstance( )
				.getReportDesignHandleAdapter( )
				.getModuleHandle( )
				.getVisibleDataSets( );

		return dataSets;

	}

	private boolean editDataSet( List existingDataSets, List newDataSets )
	{
		if ( existingDataSets == null || newDataSets == null )
		{
			return false;
		}

		if ( newDataSets.size( ) <= existingDataSets.size( ) )
		{
			return false;
		}

		dataSetHandle = findNewDataSet( existingDataSets, newDataSets );

		if ( dataSetHandle == null )
			return false;
		// The last element was the One added
		// DataSetHandle dataSetHandle = (DataSetHandle) newDataSets.get(
		// newDataSets.size( ) - 1 );
		// Edit the added DataSet if it is not a script data set.
		if ( dataSetHandle instanceof ScriptDataSetHandle )
		{
			return false;
		}
		DataSetEditor dialog = new DataSetEditor( PlatformUI.getWorkbench( )
				.getDisplay( )
				.getActiveShell( ), dataSetHandle , false );
		return ( dialog.open( ) == Window.OK );
	}

	private DataSetHandle findNewDataSet( List existingDataSets,
			List newDataSets )
	{
		for ( int i = 0; i < newDataSets.size( ); i++ )
		{
			if ( !existingDataSets.contains( newDataSets.get( i ) ) )
			{
				return (DataSetHandle) newDataSets.get( i );
			}
		}
		return null;
	}
}