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/*
 *
 * Copyright 2014 McEvoy Software Ltd.
 *
 * 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 io.milton.http.annotated;

import io.milton.common.Formatter;
import java.lang.reflect.InvocationTargetException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.beanutils.ConvertUtilsBean2;
import org.apache.commons.beanutils.converters.BigDecimalConverter;
import org.apache.commons.lang.StringUtils;

/**
 *
 * @author brad
 */
public class DataBinder {

	/**
	 * Trims to null, so will never return a value padded with white space, or only whitespace
	 * 
	 * @param props
	 * @param name
	 * @return 
	 */
	public static String getRawParam(Map props, String name) {
		String s = props.get(name);
		return StringUtils.trimToNull(s);
	}
		
    private final BeanUtilsBean bub;
    //private String[] dateFormats = {"dd/MM/yy", "dd/MM/yyyy", "dd/MM/yyyy HH:mm", "dd/MM/yy HH:mm"};
    //private String[] dateFormats = {"dd/MM/yyyy"};

	private final String[] dateFormats = {"dd/MM/yyyy", "dd/MM/yyyy HH:mm", "yyyy/MM/dd HH:mm"};
	
    private static final ThreadLocal tlTimezone = new ThreadLocal<>();

    public static void setTimeZoneForRequest(TimeZone tz) {
        tlTimezone.set(tz);
    }
    
    public static java.util.TimeZone getTimeZoneForRequest() {
        return tlTimezone.get();
    }	
	
    public DataBinder() {
        ConvertUtilsBean2 convertUtilsBean = new ConvertUtilsBean2();
        NullSafeDateTimeConverter dtConverter = new NullSafeDateTimeConverter();
		dtConverter.setPatterns(dateFormats);
        convertUtilsBean.register(dtConverter, Date.class);
        
        BigDecimalConverter bdConverter = new BigDecimalConverter(null);
        convertUtilsBean.register(bdConverter, BigDecimal.class);

        bub = new BeanUtilsBean(convertUtilsBean);
    }

	/**
	 * 
	 * @param bean - the object to bind to, using bean property accessors
	 * @param properties - the map of values to attempt to bind
	 * @throws IllegalAccessException
	 * @throws InvocationTargetException 
	 */
	public void populate(Object bean, Map properties) throws IllegalAccessException, InvocationTargetException {
		populate(bean, properties, null);
	}
	
	/**
	 * 
	 * @param bean
	 * @param properties - the map of properties to attempt to bind to the bean
	 * @param timeZone - timezone to use for date/time conversions
	 * @throws IllegalAccessException
	 * @throws InvocationTargetException 
	 */
    public void populate(Object bean, Map properties,TimeZone timeZone) throws IllegalAccessException, InvocationTargetException {
		tlTimezone.set(timeZone);
		
        // need to cater for check boxes which send no value if not set
        // we use a convention that every check has a hidden input with name=name_checkbox
        // see Formatter.checkbox for details
        List keys = new ArrayList(properties.keySet());
        for(Object key : keys) {
            String k = key.toString();
            if( k.endsWith("_checkbox")) {
                String propName = k.replace(Formatter.CHECKBOX_SUFFIX, "");
                if( !properties.containsKey(propName)) {
                    properties.put(propName, "");
                }
            }
        }
        bub.populate(bean, properties);
    }
}