/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.android.dx.mockito;

import com.android.dx.stock.ProxyBuilder;

import org.mockito.Mockito;
import org.mockito.invocation.InvocationFactory.RealMethodBehavior;
import org.mockito.invocation.MockHandler;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import static org.mockito.Mockito.withSettings;

/**
 * Handles proxy method invocations to dexmaker's InvocationHandler by calling
 * a MockitoInvocationHandler.
 */
final class InvocationHandlerAdapter implements InvocationHandler {
    private MockHandler handler;

    public InvocationHandlerAdapter(MockHandler handler) {
        this.handler = handler;
    }

    @Override
    public Object invoke(final Object proxy, final Method method, final Object[] rawArgs)
            throws Throwable {
        // args can be null if the method invoked has no arguments, but Mockito expects a non-null array
        Object[] args = rawArgs != null ? rawArgs : new Object[0];
        if (isEqualsMethod(method)) {
            return proxy == args[0];
        } else if (isHashCodeMethod(method)) {
            return System.identityHashCode(proxy);
        }

        return handler.handle(Mockito.framework().getInvocationFactory().createInvocation(proxy,
                withSettings().build(proxy.getClass().getSuperclass()), method,
                new RealMethodBehavior() {
            @Override
            public Object call() throws Throwable {
                return ProxyBuilder.callSuper(proxy, method, rawArgs);
            }
        }, args));
    }

    public MockHandler getHandler() {
        return handler;
    }

    public void setHandler(MockHandler handler) {
        this.handler = handler;
    }

    private static boolean isEqualsMethod(Method method) {
        return method.getName().equals("equals")
                && method.getParameterTypes().length == 1
                && method.getParameterTypes()[0] == Object.class;
    }

    private static boolean isHashCodeMethod(Method method) {
        return method.getName().equals("hashCode")
                && method.getParameterTypes().length == 0;
    }
}