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package net.anthavio.httl.api;

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Date;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import net.anthavio.httl.HttlRequestBuilder;
import net.anthavio.httl.HttlRequestException;
import net.anthavio.httl.api.HttlApiBuilder.ApiVarMeta;

/**
 * Optional 'setter' field of @HttlVar annotation must implement this interface.
 * 
 * Usage example:
 * 
 * @HttlCall("GET /paging")
 * String paging(@HttlVar(value = "page", setter = PageableSetter.class) Pageable pager);
 * 		
 * @author martin.vanek
 *
 */
public interface VarSetter {

	/**
	 * Pass value into builder as you want...
	 */
	public void set(T value, String name, HttlRequestBuilder builder);

	public static final MapVarSetter MapVarSetter = new MapVarSetter();

	/**
	 * Built-in Map API parameter VarSetter
	 * 
	 * @author martin.vanek
	 *
	 */
	public static class MapVarSetter implements VarSetter> {

		@Override
		public void set(Map value, String name, HttlRequestBuilder builder) {
			if (value != null) {
				Set> entrySet = value.entrySet();
				for (Entry entry : entrySet) {
					if (entry.getKey() != null && entry.getValue() != null) {
						if (name != null) {
							name = name + entry.getKey();
						} else {
							name = String.valueOf(entry.getKey());
						}
						Object valuex = entry.getValue();
						if (valuex instanceof Collection) {
							builder.param(name, (Collection) valuex);
						} else if (valuex.getClass().isArray()) {
							if (valuex instanceof Object[]) {
								builder.param(name, (Object[]) valuex); //Array of String[] ???	
							} else {
								//primitive array of some sort
								int length = Array.getLength(valuex);
								for (int i = 0; i < length; ++i) {
									builder.param(name, Array.get(valuex, i));
								}
							}

						} else if (valuex instanceof Date) {
							builder.param(name, (Date) valuex);
						} else {
							builder.param(name, valuex);
						}
					}
				}
			}
		}
	}

	/**
	 * 
	 * For Custom Beans API parameter - copy bean fields into request
	 * 
	 * @author martin.vanek
	 *
	 */
	public static class BeanMetaVarSetter implements VarSetter