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/*
 * The MIT License
 *
 *   Copyright (c) 2020, Mahmoud Ben Hassine ([email protected])
 *
 *   Permission is hereby granted, free of charge, to any person obtaining a copy
 *   of this software and associated documentation files (the "Software"), to deal
 *   in the Software without restriction, including without limitation the rights
 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *   copies of the Software, and to permit persons to whom the Software is
 *   furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included in
 *   all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *   THE SOFTWARE.
 */
package org.jeasy.random;

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

import static org.jeasy.random.util.ReflectionUtils.isParameterizedType;
import static org.jeasy.random.util.ReflectionUtils.isPopulatable;

/**
 * Populator for {@link Optional} type.
 * 
 * @author Mahmoud Ben Hassine ([email protected])
 */
class OptionalPopulator {

	private final EasyRandom easyRandom;

	OptionalPopulator(EasyRandom easyRandom) {
		this.easyRandom = easyRandom;
	}

	Optional getRandomOptional(final Field field, final RandomizationContext context) {
		Type fieldGenericType = field.getGenericType();
		if (isParameterizedType(fieldGenericType)) { // populate only parameterized types, raw types will be empty
			ParameterizedType parameterizedType = (ParameterizedType) fieldGenericType;
			Type genericType = parameterizedType.getActualTypeArguments()[0];
			if (isPopulatable(genericType)) {
				return Optional.of(easyRandom.doPopulateBean((Class) genericType, context));
			} else {
				return Optional.empty();
			}
		} else {
			return Optional.empty();
		}
	}
}