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/**
 * Copyright 2018 Nikita Koksharov
 *
 * 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 org.redisson.reactive;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.function.Supplier;

import org.redisson.api.RFuture;
import org.redisson.command.CommandReactiveExecutor;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class ReactiveProxyBuilder {

    private static final ConcurrentMap methodsMapping = new ConcurrentHashMap();
    
    public static  T create(CommandReactiveExecutor commandExecutor, Object instance, Class clazz) {
        return create(commandExecutor, instance, null, clazz);
    }
    
    public static  T create(final CommandReactiveExecutor commandExecutor, final Object instance, final Object implementation, final Class clazz) {
        InvocationHandler handler = new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, final Object[] args) throws Throwable {
                Method instanceMethod = methodsMapping.get(method);
                if (instanceMethod == null) {
                    if (implementation != null) {
                        try {
                            instanceMethod = implementation.getClass().getMethod(method.getName(), method.getParameterTypes());
                        } catch (NoSuchMethodException e) {
                            try {
                                instanceMethod = instance.getClass().getMethod(method.getName() + "Async", method.getParameterTypes());
                            } catch (Exception e2) {
                                instanceMethod = instance.getClass().getMethod(method.getName(), method.getParameterTypes());
                            }
                        }
                    } else {
                        try {
                            instanceMethod = instance.getClass().getMethod(method.getName() + "Async", method.getParameterTypes());
                        } catch (NoSuchMethodException e) {
                            instanceMethod = instance.getClass().getMethod(method.getName(), method.getParameterTypes());
                        }
                    }
                    
                    methodsMapping.put(method, instanceMethod);
                }
                
                final Method mm = instanceMethod;
                if (instanceMethod.getName().endsWith("Async")) {
                    return commandExecutor.reactive(new Supplier>() {
                        @SuppressWarnings("unchecked")
                        @Override
                        public RFuture