/*******************************************************************************
 * 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.chart.render;

import org.eclipse.birt.chart.computation.DataPointHints;
import org.eclipse.birt.chart.computation.Methods;
import org.eclipse.birt.chart.computation.withaxes.SeriesRenderingHints;
import org.eclipse.birt.chart.datafeed.DifferenceEntry;
import org.eclipse.birt.chart.device.IPrimitiveRenderer;
import org.eclipse.birt.chart.device.IStructureDefinitionListener;
import org.eclipse.birt.chart.engine.extension.i18n.Messages;
import org.eclipse.birt.chart.event.TextRenderEvent;
import org.eclipse.birt.chart.event.WrappedStructureSource;
import org.eclipse.birt.chart.exception.ChartException;
import org.eclipse.birt.chart.log.ILogger;
import org.eclipse.birt.chart.model.ChartWithAxes;
import org.eclipse.birt.chart.model.attribute.Bounds;
import org.eclipse.birt.chart.model.attribute.ChartDimension;
import org.eclipse.birt.chart.model.attribute.ColorDefinition;
import org.eclipse.birt.chart.model.attribute.Fill;
import org.eclipse.birt.chart.model.attribute.LineAttributes;
import org.eclipse.birt.chart.model.attribute.Location;
import org.eclipse.birt.chart.model.attribute.Marker;
import org.eclipse.birt.chart.model.attribute.Position;
import org.eclipse.birt.chart.model.component.Label;
import org.eclipse.birt.chart.model.data.SeriesDefinition;
import org.eclipse.birt.chart.model.layout.Legend;
import org.eclipse.birt.chart.model.layout.Plot;
import org.eclipse.birt.chart.model.type.DifferenceSeries;
import org.eclipse.birt.chart.model.type.LineSeries;
import org.eclipse.birt.chart.plugin.ChartEngineExtensionPlugin;
import org.eclipse.birt.chart.script.ScriptHandler;
import org.eclipse.birt.chart.util.ChartUtil;
import org.eclipse.birt.chart.util.FillUtil;
import org.eclipse.emf.common.util.EList;

/**
 * This is the renderer implementation used for difference chart.
 */
public class Difference extends Line
{

	/**
	 * The constructor.
	 */
	public Difference( )
	{
		super( );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.render.Line#renderSeries(org.eclipse.birt.chart.device.IPrimitiveRenderer,
	 *      org.eclipse.birt.chart.model.layout.Plot,
	 *      org.eclipse.birt.chart.render.ISeriesRenderingHints)
	 */
	public void renderSeries( IPrimitiveRenderer ipr, Plot p,
			ISeriesRenderingHints isrh ) throws ChartException
	{

		final ChartWithAxes cwa = (ChartWithAxes) getModel( );
		if ( cwa.getDimension( ) != ChartDimension.TWO_DIMENSIONAL_LITERAL )
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.RENDERING,
					"exception.difference.dimension", //$NON-NLS-1$
					new Object[]{
						cwa.getDimension( ).getName( )
					},
					Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
		}

		// VALIDATE CONSISTENT DATASET COUNT BETWEEN BASE AND ORTHOGONAL
		try
		{
			validateDataSetCount( isrh );
		}
		catch ( ChartException vex )
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.RENDERING,
					vex );
		}

		// SCALE VALIDATION
		SeriesRenderingHints srh = (SeriesRenderingHints) isrh;

//		if ( !srh.isCategoryScale( ) )
//		{
//			throw new ChartException( ChartEngineExtensionPlugin.ID,
//					ChartException.RENDERING,
//					"exception.xvalue.scale.difference", //$NON-NLS-1$
//					Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
//		}

		// OBTAIN AN INSTANCE OF THE SERIES MODEL (AND SOME VALIDATION)
		DifferenceSeries ds = (DifferenceSeries) getSeries( );

		if ( !ds.isVisible( ) )
		{
			return;
		}

		// OBTAIN AN INSTANCE OF THE CHART (TO RETRIEVE GENERAL CHART PROPERTIES
		// IF ANY)
		logger.log( ILogger.INFORMATION,
				Messages.getString( "info.render.series", //$NON-NLS-1$
						new Object[]{
								getClass( ).getName( ),
								Integer.valueOf( iSeriesIndex + 1 ),
								Integer.valueOf( iSeriesCount )
						},
						getRunTimeContext( ).getULocale( ) ) ); // i18n_CONCATENATIONS_REMOVED

		// SETUP VARIABLES NEEDED TO RENDER THE SERIES
		final ScriptHandler sh = getRunTimeContext( ).getScriptHandler( );
		final DataPointHints[] dpha = isrh.getDataPoints( );
		validateNullDatapoint( dpha );

		// SETUP VARIABLES NEEDED TO COMPUTE CO-ORDINATES
		double fX, fY, fUnit, fPos, fNeg;
		double[] faX = new double[dpha.length];
		double[][] faY = new double[2][dpha.length];

		// SETUP THE MARKER FILL COLOR FROM THE SERIES DEFINITION PALETTE (BY
		// CATEGORIES OR BY SERIES)
		SeriesDefinition sd = getSeriesDefinition( );
		final EList<Fill> elPalette = sd.getSeriesPalette( ).getEntries( );
		if ( elPalette.isEmpty( ) )
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.RENDERING,
					"exception.empty.palette", //$NON-NLS-1$
					new Object[]{
						ds
					},
					Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
		}

		final boolean isTransposed = isTransposed( );
		final boolean bPaletteByCategory = isPaletteByCategory( );

		if ( bPaletteByCategory && ds.eContainer( ) instanceof SeriesDefinition )
		{
			sd = (SeriesDefinition) ds.eContainer( );
		}

		int iThisSeriesIndex = sd.getRunTimeSeries( ).indexOf( ds );
		if ( iThisSeriesIndex < 0 )
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.RENDERING,
					"exception.missing.series.for.palette.index", //$NON-NLS-1$ 
					new Object[]{
							ds, sd
					},
					Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
		}

		Marker posMarker = null;
		if ( ds.getMarkers( ).size( ) > 0 )
		{
			posMarker = ds.getMarkers( ).get( iThisSeriesIndex
					% ds.getMarkers( ).size( ) );
		}

		Marker negMarker = null;
		if ( ds.getNegativeMarkers( ).size( ) > 0 )
		{
			negMarker = ds.getNegativeMarkers( ).get( iThisSeriesIndex
					% ds.getNegativeMarkers( ).size( ) );
		}

		Fill fPaletteEntry = null;
		if ( !bPaletteByCategory )
		{
			fPaletteEntry = FillUtil.getPaletteFill( elPalette,
					iThisSeriesIndex );
		}
		else if ( iSeriesIndex > 0 )
		{
			// Here eliminate the position for one base series.
			// NOTE only one base series allowed now.
			fPaletteEntry = FillUtil.getPaletteFill( elPalette,
					iSeriesIndex - 1 );
		}
		updateTranslucency( fPaletteEntry, ds );

		// Update Line color
		LineAttributes liaPos = ds.getLineAttributes( );
		LineAttributes liaNeg = ds.getNegativeLineAttributes( );
		if ( ( (LineSeries) getSeries( ) ).isPaletteLineColor( ) )
		{
			final Fill[] fills = DifferenceRenderer.createDifferenceFillFromPalette( fPaletteEntry,
					true );
			if ( fills[0] instanceof ColorDefinition
					&& fills[1] instanceof ColorDefinition )
			{
				liaPos.setColor( (ColorDefinition) fills[0] );
				liaNeg.setColor( (ColorDefinition) fills[1] );
			}
		}

		// THE MAIN LOOP THAT WALKS THROUGH THE DATA POINT HINTS ARRAY 'dpha'
		for ( int i = 0; i < dpha.length; i++ )
		{
			DifferenceEntry de = (DifferenceEntry) dpha[i].getOrthogonalValue( );

			faX[i] = Double.NaN;
			faY[0][i] = Double.NaN;
			faY[1][i] = Double.NaN;

			if ( !DifferenceRenderer.isValidDifferenceEntry( de ) )
			{
				continue;
			}

			Location lo = dpha[i].getLocation( );

			fPos = srh.getLocationOnOrthogonal( new Double( de.getPositiveValue( ) ) );
			fNeg = srh.getLocationOnOrthogonal( new Double( de.getNegativeValue( ) ) );

			if ( isTransposed )
			{
				fUnit = dpha[i].getSize( );
				fY = ( lo.getY( ) + fUnit / 2.0 );
				// for fixing the position change in refreshing
				// lo.setY( fY );

				faX[i] = fY;
				faY[0][i] = fPos;
				faY[1][i] = fNeg;
			}
			else
			{
				fUnit = dpha[i].getSize( );
				fX = ( lo.getX( ) + fUnit / 2.0 );
				// for fixing the position change in refreshing
				// lo.setX( fX );

				faX[i] = fX;
				faY[0][i] = fPos;
				faY[1][i] = fNeg;
			}
		}
		
		if ( isTransposed )
		{
			handleOutsideDataPoints( ipr, srh, faY[0], faX, false );
			handleOutsideDataPoints( ipr, srh, faY[1], faX, false );
		}
		else
		{
			handleOutsideDataPoints( ipr, srh, faX, faY[0], false );
			handleOutsideDataPoints( ipr, srh, faX, faY[1], false );
		}

		if ( ds.isCurve( ) )
		{
			DifferenceRenderer.renderDifferenceCurve( this,
					ipr,
					dpha,
					isTransposed ? goFactory.createLocations( faY[0], faX )
							: goFactory.createLocations( faX, faY[0] ),
					isTransposed ? goFactory.createLocations( faY[1], faX )
							: goFactory.createLocations( faX, faY[1] ),
					liaPos,
					liaNeg,
					fPaletteEntry );
		}
		else
		{
			DifferenceRenderer.renderDifferencePolygon( this,
					ipr,
					dpha,
					isTransposed ? goFactory.createLocations( faY[0], faX )
							: goFactory.createLocations( faX, faY[0] ),
					isTransposed ? goFactory.createLocations( faY[1], faX )
							: goFactory.createLocations( faX, faY[1] ),
					liaPos,
					liaNeg,
					fPaletteEntry );
		}

		// RENDER THE MARKERS NEXT
		if ( negMarker != null || posMarker != null )
		{
			for ( int i = 0; i < dpha.length; i++ )
			{
				DifferenceEntry de = (DifferenceEntry) dpha[i].getOrthogonalValue( );
				if ( !DifferenceRenderer.isValidDifferenceEntry( de )
						|| dpha[i].isOutside( ) )
				{
					continue;
				}

				if ( bPaletteByCategory )
				{
					fPaletteEntry = FillUtil.getPaletteFill( elPalette, i );
				}
				else
				{
					fPaletteEntry = FillUtil.getPaletteFill( elPalette,
							iThisSeriesIndex );
				}
				updateTranslucency( fPaletteEntry, ds );
				
				ScriptHandler.callFunction( sh,
						ScriptHandler.BEFORE_DRAW_DATA_POINT,
						dpha[i],
						fPaletteEntry,
						getRunTimeContext( ).getScriptContext( ) );
				getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.BEFORE_DRAW_DATA_POINT,
						dpha[i] );

				if ( negMarker != null )
				{
					Fill negFill = ChartUtil.convertFill( fPaletteEntry,
							-1,
							null );

					renderMarker( ds,
							ipr,
							negMarker,
							isTransposed ? goFactory.createLocation( faY[1][i],
									faX[i] )
									: goFactory.createLocation( faX[i],
									faY[1][i] ),
							liaNeg,
							negFill,
							dpha[i],
							null,
							true,
							true );
				}

				if ( posMarker != null )
				{
					Fill posFill = ChartUtil.convertFill( fPaletteEntry,
							1,
							null );

					renderMarker( ds,
							ipr,
							posMarker,
							isTransposed ? goFactory.createLocation( faY[0][i],
									faX[i] )
									: goFactory.createLocation( faX[i],
									faY[0][i] ),
							liaPos,
							posFill,
							dpha[i],
							null,
							true,
							true );
				}

				ScriptHandler.callFunction( sh,
						ScriptHandler.AFTER_DRAW_DATA_POINT,
						dpha[i],
						fPaletteEntry,
						getRunTimeContext( ).getScriptContext( ) );
				getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.AFTER_DRAW_DATA_POINT,
						dpha[i] );
			}
		}

		// DATA POINT RELATED VARIABLES ARE INITIALIZED HERE
		Label laDataPoint = srh.getLabelAttributes( ds );

		if ( laDataPoint.isVisible( ) ) // ONLY COMPUTE IF NECESSARY
		{
			Position posDataPoint = srh.getLabelPosition( ds );
			Location loDataPoint = goFactory.createLocation( 0, 0 );

			final double dSize = ( posMarker == null ) ? 0
					: posMarker.getSize( );

			for ( int i = 0; i < dpha.length; i++ )
			{
				DifferenceEntry de = (DifferenceEntry) dpha[i].getOrthogonalValue( );
				if ( !DifferenceRenderer.isValidDifferenceEntry( de )
						|| dpha[i].isOutside( ) )
				{
					continue;
				}

				laDataPoint.getCaption( ).setValue( dpha[i].getDisplayValue( ) );

				ScriptHandler.callFunction( sh,
						ScriptHandler.BEFORE_DRAW_DATA_POINT_LABEL,
						dpha[i],
						laDataPoint,
						getRunTimeContext( ).getScriptContext( ) );
				getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.BEFORE_DRAW_DATA_POINT_LABEL,
						laDataPoint );

				if ( laDataPoint.isVisible( ) )
				{
					fX = faX[i];
					fY = faY[1][i];

					if ( isTransposed )
					{
						fX = faY[1][i];
						fY = faX[i];
					}

					switch ( posDataPoint.getValue( ) )
					{
						case Position.ABOVE :
							loDataPoint.set( fX, fY
									- dSize - p.getVerticalSpacing( ) );
							break;
						case Position.BELOW :
							loDataPoint.set( fX, fY
									+ dSize + p.getVerticalSpacing( ) );
							break;
						case Position.LEFT :
							loDataPoint.set( fX
									- dSize - p.getHorizontalSpacing( ), fY );
							break;
						case Position.RIGHT :
							loDataPoint.set( fX
									+ dSize + p.getHorizontalSpacing( ), fY );
							break;
						default :
							throw new ChartException( ChartEngineExtensionPlugin.ID,
									ChartException.RENDERING,
									"exception.illegal.datapoint.position.line",//$NON-NLS-1$
									new Object[]{
										posDataPoint.getName( )
									},
									Messages.getResourceBundle( getRunTimeContext( ).getULocale( ) ) );
					}
					renderLabel( WrappedStructureSource.createSeriesDataPoint( ds,
							dpha[i] ),
							TextRenderEvent.RENDER_TEXT_AT_LOCATION,
							laDataPoint,
							posDataPoint,
							loDataPoint,
							null );
				}

				ScriptHandler.callFunction( sh,
						ScriptHandler.AFTER_DRAW_DATA_POINT_LABEL,
						dpha[i],
						laDataPoint,
						getRunTimeContext( ).getScriptContext( ) );
				getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.AFTER_DRAW_DATA_POINT_LABEL,
						laDataPoint );
			}
		}

		restoreClipping( ipr );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.render.Line#renderLegendGraphic(org.eclipse.birt.chart.device.IPrimitiveRenderer,
	 *      org.eclipse.birt.chart.model.layout.Legend,
	 *      org.eclipse.birt.chart.model.attribute.Fill,
	 *      org.eclipse.birt.chart.model.attribute.Bounds)
	 */
	public void renderLegendGraphic( IPrimitiveRenderer ipr, Legend lg,
			Fill fPaletteEntry, Bounds bo ) throws ChartException
	{
		if ( ( bo.getWidth( ) == 0 ) && ( bo.getHeight( ) == 0 ) )
		{
			return;
		}
		final DifferenceSeries ds = (DifferenceSeries) getSeries( );
		if ( fPaletteEntry == null )
		{
			fPaletteEntry = goFactory.RED( );
		}

		// Fix Bugzilla bug 188846.
		Location[] loa1 = new Location[2];
		loa1[0] = goFactory.createLocation( bo.getLeft( )
				+ 1
				* getDeviceScale( ), bo.getTop( ) + 2 * getDeviceScale( ) );
		loa1[1] = goFactory.createLocation( bo.getLeft( )
				+ bo.getWidth( )
				- 1
				* getDeviceScale( ), bo.getTop( ) + 2 * getDeviceScale( ) );
		
		Location[] loa2 = new Location[2];
		loa2[0] = goFactory.createLocation( bo.getLeft( )
				+ 1
				* getDeviceScale( ), bo.getTop( )
				+ bo.getHeight( )
				- 2
				* getDeviceScale( ) );
		loa2[1] = goFactory.createLocation( bo.getLeft( )
				+ bo.getWidth( )
				- 1
				* getDeviceScale( ), bo.getTop( )
				+ bo.getHeight( )
				- 2
				* getDeviceScale( ) );
		
		// Always render non-transposed curve line for difference legend
		DifferenceRenderer.renderDifferenceCurve( this,
				ipr,
				null,
				loa1,
				loa2,
				ds.getLineAttributes( ),
				ds.getNegativeLineAttributes( ),
				fPaletteEntry );
		dc.flush( );

	}
	
	protected int checkEntryInRange( Object entry, Object min, Object max )
	{
		if ( entry instanceof DifferenceEntry )
		{
			double vP = ( (DifferenceEntry) entry ).getPositiveValue( );
			double vN = ( (DifferenceEntry) entry ).getNegativeValue( );
			double dMin = Methods.asDouble( min ).doubleValue( );
			double dMax = Methods.asDouble( max ).doubleValue( );
			if ( vP < dMin || vN < dMin )
			{
				return 1;
			}
			if ( vP > dMax || vN > dMax )
			{
				return 2;
			}
			return 0;
		}
		return super.checkEntryInRange( entry, min, max );
	}

}
