package org.eclipse.birt.report.engine.parser;

import java.util.HashMap;

import org.eclipse.birt.report.engine.css.engine.value.FloatValue;
import org.eclipse.birt.report.engine.css.engine.value.RGBColorValue;
import org.eclipse.birt.report.engine.css.engine.value.StringValue;
import org.eclipse.birt.report.engine.css.engine.value.birt.BIRTConstants;
import org.eclipse.birt.report.engine.ir.DimensionType;
import org.eclipse.birt.report.engine.ir.EngineIRConstants;
import org.eclipse.birt.report.model.api.util.ColorUtil;
import org.w3c.dom.css.CSSPrimitiveValue;
import org.w3c.dom.css.CSSValue;

/**
 * This class provides methods to convert Model types to CSSValue types.
 */
public class IRTypeConverter
{
	private final static HashMap UnitMapping = new HashMap( );
	
	static
	{
		UnitMapping.put( EngineIRConstants.UNITS_CM, Short.valueOf( CSSPrimitiveValue.CSS_CM ) );
		UnitMapping.put( EngineIRConstants.UNITS_CM, Short.valueOf( CSSPrimitiveValue.CSS_CM ) );
		UnitMapping.put( EngineIRConstants.UNITS_EM, Short.valueOf( CSSPrimitiveValue.CSS_EMS ) );
		UnitMapping.put( EngineIRConstants.UNITS_EX, Short.valueOf( CSSPrimitiveValue.CSS_EXS ) );
		UnitMapping.put( EngineIRConstants.UNITS_IN, Short.valueOf( CSSPrimitiveValue.CSS_IN ) );
		UnitMapping.put( EngineIRConstants.UNITS_MM, Short.valueOf( CSSPrimitiveValue.CSS_MM ) );
		UnitMapping.put( EngineIRConstants.UNITS_PC, Short.valueOf( CSSPrimitiveValue.CSS_PC ) );
		UnitMapping.put( EngineIRConstants.UNITS_PERCENTAGE, Short.valueOf( CSSPrimitiveValue.CSS_PERCENTAGE ) );
		UnitMapping.put( EngineIRConstants.UNITS_PT, Short.valueOf( CSSPrimitiveValue.CSS_PT ) );
		UnitMapping.put( EngineIRConstants.UNITS_PX, Short.valueOf( CSSPrimitiveValue.CSS_PX ) );
	}
	
	public static CSSValue toColor(Object value)
	{
		return toRGBColor( value );
	}
	
	public static CSSPrimitiveValue toCSSValue( short type, Object value )
	{
		CSSPrimitiveValue tempValue = null;
		switch( type )
		{
		case CSSPrimitiveValue.CSS_RGBCOLOR:
			tempValue = toRGBColor( value );
			break;
			
		case CSSPrimitiveValue.CSS_UNKNOWN:
			// check if it's a float value
			tempValue = toFloatValue( value );
			break;

		case CSSPrimitiveValue.CSS_STRING:
		case CSSPrimitiveValue.CSS_URI:
			return toStringValue( type, value );

		default:
			tempValue = toFloatValue( value );
		}
		
		if( tempValue != null )
		{
			return tempValue;
		}
		// convert to string value
		return toStringValue( value );
	}
	
	/**
	 * Converts to CSS RGBColor
	 */
	public static RGBColorValue toRGBColor( Object value )
	{
		if( value == null )
		{
			return null;
		}
		
		if( value instanceof Number )
		{
			return toRGBColor( ( ( Number ) value ).intValue( ) );
		}
		else
		{
			return toRGBColor( value.toString( ) );
		}
	}

	public static RGBColorValue toRGBColor( String strValue )
	{
		return toRGBColor( ColorUtil.parseColor( strValue ) );
	}
	
	public static RGBColorValue toRGBColor( int intValue )
	{
		if ( intValue > 0xFFFFFF || intValue < 0 )
		{
			return null;
		}
		
		float r = intValue >> 16;
		float g = ( intValue >> 8 ) & 0xFF;
		float b = intValue & 0xFF;
		
		return new RGBColorValue(
				toFloatValue( r ),
				toFloatValue( g ),
				toFloatValue( b ) );
	}
	
	/**
	 * Converts to CSS StringValue
	 */
	public static StringValue toStringValue( short type, String value )
	{
		return new StringValue( type, value );
	}

	public static StringValue toStringValue( short type, Object value )
	{
		if( value == null )
		{
			return null;
		}
		
		if( value instanceof Boolean )
		{
			return toStringValue( type,
					( ( Boolean ) value ).booleanValue( )?
							BIRTConstants.BIRT_TRUE_VALUE :
							BIRTConstants.BIRT_FALSE_VALUE );
		}

		return toStringValue( type, value.toString( ) );
	}
	
	public static StringValue toStringValue( Object value )
	{
		return toStringValue( CSSPrimitiveValue.CSS_STRING, value );
	}
	
	/**
	 * Converts various type of value to CSS FloatValue
	 */
	public static FloatValue toFloatValue( float value )
	{
		return new FloatValue( CSSPrimitiveValue.CSS_NUMBER, value );
	}
	
	public static FloatValue toFloatValue( Object value )
	{
		if( value == null )
		{
			return null;
		}
		
		if( value instanceof Number )
		{
			return new FloatValue( CSSPrimitiveValue.CSS_NUMBER, ( ( Number ) value ).floatValue( ) );
		}
		else if( value instanceof DimensionType )
		{
			return toFloatValue( ( DimensionType ) value );
		}
		else
		{
			return toFloatValue( value.toString( ) );			
		}
	}
	
	public static FloatValue toFloatValue( String value )
	{
		try
		{
			Float fValue = new Float( value );
			return new FloatValue( CSSPrimitiveValue.CSS_NUMBER, fValue.floatValue( ) );
		}
		catch( NumberFormatException ex )
		{
		}
		return toFloatValue( DimensionType.parserUnit( value ) );
	}
	
	public static FloatValue toFloatValue( DimensionType value )
	{
		if ( value.getValueType( ) == DimensionType.TYPE_DIMENSION )
		{
			Object obj = UnitMapping.get( value.getUnits( ) );
			short unit;
			if( obj != null )
			{
				unit = ( ( Short ) obj ).shortValue( );
			}
			else
			{
				unit = CSSPrimitiveValue.CSS_NUMBER;
			}
			
			return new FloatValue( unit, ( float ) value.getMeasure( ) );
		}
		return null;
	}
}
