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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 io.microsphere.reflect;

import io.microsphere.util.BaseUtils;

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.List;
import java.util.function.Predicate;

import static io.microsphere.lang.function.Predicates.and;
import static io.microsphere.reflect.ConstructorUtils.hasNonPrivateConstructorWithoutParameters;
import static io.microsphere.reflect.MemberUtils.FINAL_METHOD_PREDICATE;
import static io.microsphere.reflect.MemberUtils.NON_PRIVATE_METHOD_PREDICATE;
import static io.microsphere.reflect.MemberUtils.NON_STATIC_METHOD_PREDICATE;
import static io.microsphere.reflect.MethodUtils.OBJECT_METHOD_PREDICATE;
import static io.microsphere.reflect.MethodUtils.getAllDeclaredMethods;
import static io.microsphere.util.ClassUtils.isArray;
import static io.microsphere.util.ClassUtils.isPrimitive;
import static java.lang.reflect.Modifier.isFinal;


/**
 * The utilities class for {@link Proxy Proxy}
 *
 * @author Mercy
 * @since 1.0.0
 */
public abstract class ProxyUtils extends BaseUtils {

    /**
     * 
     *     class has a non-private constructor with no parameters
     *     class is not declared final
     *     class does not have non-static, final methods with public, protected or default visibility
     *     class is not primitive type
     *     class is not array type
     * 
     *
     * @param type
     * @return
     */
    public static boolean isProxyable(Class type) {
        if (isArray(type)) {
            return false;
        }

        if (isPrimitive(type)) {
            return false;
        }

        if (isFinal(type.getModifiers())) {
            return false;
        }

        if (!hasNonPrivateConstructorWithoutParameters(type)) {
            return false;
        }

        Predicate predicate = and(NON_STATIC_METHOD_PREDICATE, FINAL_METHOD_PREDICATE,
                NON_PRIVATE_METHOD_PREDICATE, OBJECT_METHOD_PREDICATE.negate());

        List methods = getAllDeclaredMethods(type, predicate);

        return methods.isEmpty();
    }
}