/*
 * 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.component.microprofile.faulttolerance;

import java.util.concurrent.ScheduledExecutorService;

import org.apache.camel.BindToRegistry;
import org.apache.camel.RoutesBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.test.junit5.CamelTestSupport;
import org.apache.camel.util.concurrent.SizedScheduledExecutorService;
import org.eclipse.microprofile.faulttolerance.exceptions.CircuitBreakerOpenException;
import org.eclipse.microprofile.faulttolerance.exceptions.TimeoutException;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.apache.camel.test.junit5.TestSupport.assertIsInstanceOf;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

/**
 * FaultTolerance using timeout and custom thread pool with Java DSL
 */
public class FaultToleranceTimeoutThreadPoolTest extends CamelTestSupport {

    protected final Logger log = LoggerFactory.getLogger(getClass());

    @BindToRegistry
    public ScheduledExecutorService myThreadPool() {
        return context().getExecutorServiceManager().newScheduledThreadPool(this, "myThreadPool", 2);
    }

    @Test
    public void testFast() throws Exception {
        // this calls the fast route and therefore we get a response
        Object out = template.requestBody("direct:start", "fast");
        assertEquals("Fast response", out);

        SizedScheduledExecutorService pte
                = context().getRegistry().lookupByNameAndType("myThreadPool", SizedScheduledExecutorService.class);
        assertNotNull(pte);
        assertEquals(2, pte.getCorePoolSize());

        assertFalse(pte.isShutdown());
    }

    @Test
    public void testSlow() throws Exception {
        // this calls the slow route and therefore causes a timeout which
        // triggers an exception
        try {
            template.requestBody("direct:start", "slow");
            fail("Should fail due to timeout");
        } catch (Exception e) {
            // expected a timeout
            assertIsInstanceOf(TimeoutException.class, e.getCause());
        }

        SizedScheduledExecutorService pte
                = context().getRegistry().lookupByNameAndType("myThreadPool", SizedScheduledExecutorService.class);
        assertNotNull(pte);
        assertEquals(2, pte.getCorePoolSize());

        // stop camel and thread pool is also stopped
        context().stop();

        assertTrue(pte.isShutdown());
    }

    @Test
    public void testSlowLoop() throws Exception {
        // this calls the slow route and therefore causes a timeout which
        // triggers an exception
        for (int i = 0; i < 10; i++) {
            try {
                log.info(">>> test run " + i + " <<<");
                template.requestBody("direct:start", "slow");
                fail("Should fail due to timeout");
            } catch (Exception e) {
                // expected a timeout or that the CB is open
                assertTrue(e.getCause() instanceof CircuitBreakerOpenException
                        || e.getCause() instanceof org.eclipse.microprofile.faulttolerance.exceptions.TimeoutException);
            }
        }
    }

    @Override
    protected RoutesBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:start").circuitBreaker()
                        // enable and use 2 second timeout
                        .faultToleranceConfiguration().timeoutEnabled(true).timeoutDuration(2000)
                        .timeoutScheduledExecutorServiceRef("myThreadPool").end()
                        .log("FaultTolerance processing start: ${threadName}").toD("direct:${body}")
                        .log("FaultTolerance processing end: ${threadName}").end().log("After Fault Tolerance ${body}");

                from("direct:fast")
                        // this is a fast route and takes 1 second to respond
                        .log("Fast processing start: ${threadName}").delay(1000).transform().constant("Fast response")
                        .log("Fast processing end: ${threadName}");

                from("direct:slow")
                        // this is a slow route and takes 3 second to respond
                        .log("Slow processing start: ${threadName}").delay(3000).transform().constant("Slow response")
                        .log("Slow processing end: ${threadName}");
            }
        };
    }

}
