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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.rest4j.impl;

import com.rest4j.ApiException;
import com.rest4j.ConfigurationException;
import com.rest4j.impl.model.Field;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @author Joseph Kapizza 
 */
public class NestedFieldMapping extends FieldMapping {
	Method[] propGetters;
	Class[] types;
	Method[] propSetters;

	NestedFieldMapping(MarshallerImpl marshaller, Field fld, String parent) throws ConfigurationException {
		super(marshaller, fld, parent);
	}

	@Override
	boolean initAccessors(Class clz) throws ConfigurationException {
		String[] parts = getEffectivePropName().split("\\.");
		if (parts.length <= 1) {
			throw new AssertionError(getEffectivePropName());
		}
		propGetters = new Method[parts.length];
		propSetters = new Method[parts.length];
		types = new Class[parts.length];
		int i = 0;
		for (String part: parts) {
			PropertyDescriptor descr = BeanInfo.getBeanInfo(clz).getPropertyDescription(part);
			if (descr == null) {
				if (!isConstant()) {
					if (isOptional()) {
						return false;
					} else {
						throw new ConfigurationException("Cannot find property " + part + " in class " + clz);
					}
				}
			} else {
				clz = descr.getPropertyType();
				types[i] = clz;
				if (descr.getReadMethod() == null) {
					throw new ConfigurationException("No getter for property " + part + " in class " + clz);
				}
				propGetters[i] = descr.getReadMethod();
				propSetters[i] = descr.getWriteMethod();
			}
			i++;
		}
		Method setter = propSetters[propSetters.length - 1];
		if (setter != null) {
			propType = setter.getGenericParameterTypes()[0];
		}
		return true;
	}

	@Override
	boolean isReadonly() {
		return propGetters[propGetters.length-1] == null;
	}

	@Override
	public void set(Object inst, Object fieldVal) throws ApiException {
		try {
			Method setter = propSetters[propSetters.length - 1];
			if (setter == null) {
				// TODO: this should better be done at configuration time
				throw new ApiException("No setter for "+name+" found").setHttpStatus(500);
			}
			for (int i = 0; i