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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.

 *  * {@code
 * 
 *     edit (or add)
 *     
 *         
 *     
 * 
 * }
 * 
 * @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?format=" + normalize(javaToJavascriptDateFormat(getFormatString())) + "&value=" + getDateFormat().format(o));
        } catch (Exception e) {
            return super.visualize("date_converter.jsp?format=" + normalize(javaToJavascriptDateFormat(getFormatString())) + "&value=");
        }
    }

    /**
     * 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");
    }

    private String javaToJavascriptDateFormat(String s) {
        /*
         * 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)
         */
        return s.replaceAll("yy", "y").replace('M', 'm');
    }
}