package jpaoletti.jpm.struts.converter;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import jpaoletti.jpm.converter.ConverterException;
import jpaoletti.jpm.core.PMContext;
import jpaoletti.jpm.core.message.MessageFactory;

/**
 * Converter for date.<br>
 * <pre>
 * {@code
 * <converter class="jpaoletti.jpm.converter.EditDateConverter">
 *     <operationId>edit (or add)</operationId>
 *     <properties>
 *         <property name="format" value="dd/MM/yyyy" />
 *     <properties>
 * </converter>
 * }
 * </pre>
 *
 * @author jpaoletti
 *
 */
public class EditDateConverter extends EditStringConverter {

    @Override
    public Object build(PMContext ctx) throws ConverterException {
        try {
            String value = (String) ctx.getFieldValue();
            if (value != null && !"".equals(value.trim())) {
                return getDateFormat().parse((String) value);
            }
        } catch (ParseException e) {
            throw new ConverterException(MessageFactory.error(
                    ctx.getEntity(),
                    ctx.getField(),
                    "date.converter.invalid.value"));
        }
        return null;
    }

    @Override
    public String visualize(PMContext ctx) throws ConverterException {
        try {
            final Date o = (Date) ctx.getFieldValue();
            return super.visualize("date_converter.jsp?lang=" + getConfig("lang", "en") + "&format=" + normalize(javaToJavascriptDateFormat(getFormatString())) + "&value=" + getDateFormat().format(o));
        } catch (Exception e) {
            return super.visualize("date_converter.jsp?lang=" + getConfig("lang", "en") + "&format=" + normalize(javaToJavascriptDateFormat(getFormatString())) + "&value=" + getDateFormat().format(new Date()));
        }
    }

    /**
     * Return the format object of the date
     *
     * @return The format
     */
    public DateFormat getDateFormat() {
        DateFormat df = new SimpleDateFormat(getFormatString());
        return df;
    }

    private String getFormatString() {
        return getConfig("format", "MM/dd/yyyy");
    }

    /*
     * The format can be combinations of the following: d - day of month (no
     * leading zero) dd - day of month (two digit) D - day name short DD - day
     * name long m - month of year (no leading zero) mm - month of year (two
     * digit) M - month name short MM - month name long y - year (two digit) yy
     * - year (four digit)
     */
    private String javaToJavascriptDateFormat(String s) {
        return s.replaceAll("yy", "y").replace('M', 'm');
    }
}