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/*
 * Copyright 2012 Denis Neuling 
 * 
 * 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.cloudcontrolled.api.client.util;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import javax.ws.rs.core.MultivaluedMap;

import com.cloudcontrolled.api.annotation.Body;
import com.cloudcontrolled.api.client.body.BodyMultivaluedMap;
import com.cloudcontrolled.api.request.Request;
import com.cloudcontrolled.api.response.Response;

/**
 * 
 * RequestUtil class.
 * 
 * 
 * @author Denis Neuling ([email protected])
 * 
 */
public class RequestUtil {

	/**
	 * 
	 * getInstanceOfParameterizedType.
	 * 
	 * 
	 * @param request
	 *            a {@link com.cloudcontrolled.api.request.Request} object.
	 * @param 
	 *            a T object.
	 * @return a {@link com.cloudcontrolled.api.response.Response} object.
	 */
	@SuppressWarnings("unchecked")
	public static  Response getInstanceOfParameterizedType(Request request) {
		Type superclazz = request.getClass().getGenericSuperclass();
		try {
			Type parameterizedTypeClazz = ((ParameterizedType) superclazz).getActualTypeArguments()[0];
			return (Response) ((Class) parameterizedTypeClazz).newInstance();
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 
	 * getBodyAsMultiValuedMap.
	 * 
	 * 
	 * @param request
	 *            a {@link com.cloudcontrolled.api.request.Request} object.
	 * @param 
	 *            a T object.
	 * @return a {@link javax.ws.rs.core.MultivaluedMap} object.
	 */
	public static  MultivaluedMap getBodyAsMultiValuedMap(Request request) {
		MultivaluedMap map = new BodyMultivaluedMap();

		Class referenceClazz = request.getClass();
		List fields = ClassUtil.getAnnotatedFields(referenceClazz, Body.class);
		for (Field field : fields) {
			Body body = field.getAnnotation(Body.class);
			String parameter = body.value();

			// in case the value() is null or empty
			if (parameter == null || (parameter != null && parameter.isEmpty())) {
				parameter = field.getName();
			}
			String value = ClassUtil.getValueOf(field, request, referenceClazz, String.class);

			map.putSingle(parameter, value);
		}

		return map;
	}
}