/*
 * 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 org.apache.camel.processor.async;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.camel.AsyncCallback;
import org.apache.camel.CamelContext;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.ExtendedCamelContext;
import org.apache.camel.NamedNode;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.spi.InterceptStrategy;
import org.apache.camel.support.processor.DelegateAsyncProcessor;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;

/**
 * Using a custom interceptor which is not a {@link org.apache.camel.AsyncProcessor} which Camel detects and uses a
 * bridge to adapt to so the asynchronous engine can still run. Albeit not the most optimal solution but it runs. Camel
 * will log a WARN so user can see the issue and change his interceptor to comply.
 */
public class AsyncEndpointCustomInterceptorTest extends ContextTestSupport {

    private static String beforeThreadName;
    private static String afterThreadName;
    private MyInterceptor interceptor = new MyInterceptor();

    @Test
    public void testAsyncEndpoint() throws Exception {
        getMockEndpoint("mock:before").expectedBodiesReceived("Hello Camel");
        getMockEndpoint("mock:after").expectedBodiesReceived("Bye Camel");
        getMockEndpoint("mock:result").expectedBodiesReceived("Bye Camel");

        String reply = template.requestBody("direct:start", "Hello Camel", String.class);
        assertEquals("Bye Camel", reply);

        assertMockEndpointsSatisfied();

        assertEquals(8, interceptor.getCounter());

        assertFalse(beforeThreadName.equalsIgnoreCase(afterThreadName), "Should use different threads");
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                context.addComponent("async", new MyAsyncComponent());
                context.adapt(ExtendedCamelContext.class).addInterceptStrategy(interceptor);

                from("direct:start").to("mock:before").to("log:before").process(new Processor() {
                    public void process(Exchange exchange) throws Exception {
                        beforeThreadName = Thread.currentThread().getName();
                    }
                }).to("async:bye:camel").process(new Processor() {
                    public void process(Exchange exchange) throws Exception {
                        afterThreadName = Thread.currentThread().getName();
                    }
                }).to("log:after").to("mock:after").to("mock:result");
            }
        };
    }

    // START SNIPPET: e1
    private static class MyInterceptor implements InterceptStrategy {
        private AtomicInteger counter = new AtomicInteger();

        @Override
        public Processor wrapProcessorInInterceptors(
                final CamelContext context, final NamedNode definition, final Processor target, final Processor nextTarget)
                throws Exception {

            return new DelegateAsyncProcessor(target) {
                public boolean process(final Exchange exchange, final AsyncCallback callback) {
                    // we just want to count number of interceptions
                    counter.incrementAndGet();
                    // and continue processing the exchange
                    return super.process(exchange, callback);
                }
            };
        }

        public int getCounter() {
            return counter.get();
        }
    }
    // END SNIPPET: e1

}
