/***********************************************************************
 * Copyright (c) 2004, 2007 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.chart.examples.builder;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.birt.chart.exception.ChartException;
import org.eclipse.birt.chart.factory.DataRowExpressionEvaluatorAdapter;
import org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator;
import org.eclipse.birt.chart.model.Chart;
import org.eclipse.birt.chart.model.attribute.DataType;
import org.eclipse.birt.chart.ui.i18n.Messages;
import org.eclipse.birt.chart.ui.plugin.ChartUIPlugin;
import org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider;

/**
 * Provides a basic implementation for simulated data service. Used in launcher.
 * 
 */
public class DefaultDataServiceProviderImpl implements IDataServiceProvider
{

	private static final int COLUMN_COUNT = 8;
	private static final int ROW_COUNT = 6;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.interfaces.IDataServiceProvider#getPreviewHeader(java.lang.String)
	 */
	public String[] getPreviewHeader( )
	{
		String[] columns = new String[COLUMN_COUNT];
		for ( int i = 0; i < columns.length; i++ )
		{
			columns[i] = "DB Col " + ( i + 1 ); //$NON-NLS-1$
		}
		return columns;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.interfaces.IDataServiceProvider#getPreviewData(java.lang.String)
	 */
	public List getPreviewData( )
	{
		List list = new ArrayList( );
		for ( int rowNum = 0; rowNum < ROW_COUNT; rowNum++ )
		{
			String[] columns = new String[COLUMN_COUNT];
			for ( int i = 0; i < columns.length; i++ )
			{
				columns[i] = String.valueOf( ( rowNum + 1 ) * ( i + 1 ) );
			}
			list.add( columns );
		}
		return list;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.interfaces.IDataServiceProvider#getAllStyles()
	 */
	public String[] getAllStyles( )
	{
		return new String[]{};
	}

	public String[] getAllStyleDisplayNames( )
	{
		return getAllStyles( );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.interfaces.IDataServiceProvider#getCurrentStyle()
	 */
	public String getCurrentStyle( )
	{
		return null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.interfaces.IDataServiceProvider#setStyle(java.lang.String)
	 */
	public void setStyle( String styleName )
	{
		// TODO Auto-generated method stub
	}

	public Object[] getDataForColumns( String[] sExpressions, int iMaxRecords,
			boolean byRow )
	{
		// Always provide data by column whatever the byRow is false/true.
		Object[] array = new Object[sExpressions.length];
		for ( int i = 0; i < sExpressions.length; i++ )// a column
		{
			Object[] innerArray = new Object[ROW_COUNT];// a row
			for ( int j = 0; j < ROW_COUNT; j++ )
			{
				String str = sExpressions[i];
				int intStart = str.lastIndexOf( ' ' ) + 1;
				int index = Integer.valueOf( str.substring( intStart,
						intStart + 1 ) ).intValue( ) - 1;
				innerArray[j] = new Integer( ( (String[]) getPreviewData( ).get( j ) )[index] );
			}
			array[i] = innerArray;
		}
		return array;
	}

	public boolean isLivePreviewEnabled( )
	{
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#getDataType(java.lang.String)
	 */
	public DataType getDataType( String expression )
	{
		return DataType.NUMERIC_LITERAL;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#prepareRowExpressionEvaluator(org.eclipse.birt.chart.model.Chart,
	 *      java.util.List, int, boolean)
	 */
	public IDataRowExpressionEvaluator prepareRowExpressionEvaluator( Chart cm,
			List expressions, int maxRecords, boolean byRow )
			throws ChartException
	{
		final Object[] columnData;
		columnData = getDataForColumns( (String[]) expressions.toArray( new String[expressions.size( )] ),
				-1,
				false );

		final Map map = new HashMap( );
		for ( int i = 0; i < expressions.size( ); i++ )
		{
			map.put( expressions.get( i ), columnData[i] );
		}
		IDataRowExpressionEvaluator evaluator = new DataRowExpressionEvaluatorAdapter( ) {

			private int i;
			private Object[] column;

			public Object evaluate( String expression )
			{
				column = (Object[]) map.get( expression );
				if ( i >= column.length )
				{
					throw new RuntimeException( new ChartException( ChartUIPlugin.ID,
							ChartException.DATA_SET,
							Messages.getString( "ChartUIUtil.Exception.NoValueReturned" ) ) ); //$NON-NLS-1$
				}
				return column[i];
			}

			public boolean first( )
			{
				i = 0;

				if ( map.size( ) > 0 )
				{
					column = (Object[]) map.values( ).iterator( ).next( );

					if ( column != null && i <= column.length - 1 )
					{
						return true;
					}
				}

				return false;
			}

			public boolean next( )
			{
				if ( column != null && i < column.length - 1 )
				{
					i++;
					return true;
				}
				return false;
			}

			public void close( )
			{
				// no-op
			}
		};

		return evaluator;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#update(int,
	 *      java.lang.Object)
	 */
	public boolean update( String type, Object value )
	{
		// TODO Auto-generated method stub
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#getStateInformation()
	 */
	public int getState( )
	{
		return 0;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#checkState(int)
	 */
	public boolean checkState( int state )
	{
		// TODO Auto-generated method stub
		return false;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.birt.chart.ui.swt.interfaces.IDataServiceProvider#checkData(java.lang.String, java.lang.Object)
	 */
	public Object checkData( String checkType, Object data )
	{
		return null;
	}
}
