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/*
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package com.ocs.dynamo.ui.converter;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

import com.ocs.dynamo.ui.utils.VaadinUtils;
import com.vaadin.flow.data.binder.Result;
import com.vaadin.flow.data.binder.ValueContext;
import com.vaadin.flow.data.converter.StringToBigDecimalConverter;

/**
 * A converter for converting between Strings and BigDecimals
 * 
 * @author bas.rutten
 */
public class BigDecimalConverter extends StringToBigDecimalConverter {

    private static final long serialVersionUID = -6491010958762673241L;

    /**
     * Whether to use a thousands grouping separator
     */
    private boolean useGrouping;

    /**
     * The desired decimal precision
     */
    private int precision;

    /**
     * Constructor - for use with a precision and grouping setting
     */
    public BigDecimalConverter(String message, int precision, boolean useGrouping) {
        super(message);
        this.precision = precision;
        this.useGrouping = useGrouping;
    }

    @Override
    public Result convertToModel(String value, ValueContext context) {
        if (value == null) {
            return Result.ok(null);
        }
        Result number = convertToNumber(value, context);
        return number.flatMap(r -> {
            BigDecimal bd = r == null ? null : BigDecimal.valueOf(r.doubleValue()).setScale(precision, RoundingMode.HALF_UP);
            return Result.ok(bd);
        });
    }

    @Override
    protected NumberFormat getFormat(Locale locale) {
        return getDecimalFormat(locale);
    }

    /**
     * Constructs the DecimalFormat to use for formatting the values
     * 
     * @param locale the desired locale to use for the formatting
     * @return
     */
    public DecimalFormat getDecimalFormat(Locale locale) {
        locale = locale != null ? locale : VaadinUtils.getLocale();
        DecimalFormat decimalFormat = constructFormat(locale);
        decimalFormat.setGroupingUsed(useGrouping);
        decimalFormat.setMaximumFractionDigits(precision);
        decimalFormat.setMinimumFractionDigits(precision);
        return decimalFormat;
    }

    /**
     * Constructs the number format - overwrite in subclasses if needed
     * 
     * @param locale the locale
     * @return
     */
    protected DecimalFormat constructFormat(Locale locale) {
        return (DecimalFormat) DecimalFormat.getInstance(locale);
    }
}