/**
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany) 
 *                                                                            
 *  All rights reserved. This program and the accompanying materials           
 *  are made available under the terms of the Eclipse Public License 2.0        
 *  which accompanies this distribution, and is available at                  
 *  https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 *  SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation
 * 
 */
 package org.eclipse.osbp.utils.vaadin;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.ParsePosition;
import java.util.Locale;

import org.apache.commons.lang.StringEscapeUtils;

import com.vaadin.data.util.converter.StringToBigDecimalConverter;

public class StringToFormattedBigDecimalConverter extends StringToBigDecimalConverter {
	private static final long serialVersionUID = -4298862937719948986L;
	private PropertyLookup lookup = null;
	private DecimalFormat decimalFormat = null;
	
	public void setLookup(PropertyLookup lookup) {
		this.lookup = lookup;
	}

    protected DecimalFormat getFormat(Locale locale) {
        if (locale == null) {
        	if (lookup == null) {
        		locale = Locale.getDefault();
        		return (DecimalFormat) DecimalFormat.getInstance(locale);
        	} else {
        		locale = lookup.getLocale();
        	}
        }
        if (lookup == null || lookup.getFormat() == null) {
    		return (DecimalFormat) DecimalFormat.getInstance(locale);
        }
		try {
			decimalFormat = new DecimalFormat(StringEscapeUtils.unescapeHtml(lookup.getFormat()), new DecimalFormatSymbols(locale));
		} catch (IllegalArgumentException e){
			String msg = String.format("formatter %s is invalid for decimal numbers: %s", lookup.getFormat(), e.getLocalizedMessage());
			throw new ConversionException(msg);
		}

        return decimalFormat;
    }

	@Override
    protected Number convertToNumber(String value, Class<? extends Number> targetType, Locale locale) throws ConversionException {
        if (value == null) {
            return null;
        }

        // Remove leading and trailing white space
        value = value.trim();

        // Parse and detect errors. If the full string was not used, it is
        // an error.
        ParsePosition parsePosition = new ParsePosition(0);
        Number parsedValue = getFormat(locale).parse(value, parsePosition);
        if (parsePosition.getIndex() != value.length()) {
            throw new ConversionException("Could not convert '" + value
                    + "' to " + getModelType().getName());
        }

        if (parsedValue == null) {
            // Convert "" to null
            return null;
        }
        return parsedValue;
    }

	
	@Override
    public String convertToPresentation(BigDecimal value, Class<? extends String> targetType, Locale locale) throws ConversionException {
        if (value == null) {
            return null;
        }

        return getFormat(locale).format(value);
    }
}