/*
 * 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.felix.dm.lambda.itest;

import static org.apache.felix.dm.lambda.DependencyManagerActivator.component;

import org.apache.felix.dm.Component;
import org.apache.felix.dm.DependencyManager;
import org.junit.Assert;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleException;

/**
 * Test for FELIX-4334 issue.
 * 
 * Two components: A, B
 * 
 * - A provided.
 * - B has a bundle dependency on the dependency manager shell bundle, which is currently stopped.
 * - B has an instance bound dependency on A.
 * - Now unregister A.
 * - As a result of that, B becomes unavailable and is unbound from A. But B is not destroyed, because A dependency 
 *   is "instance bound". So B is still bound to the bundle dependency.
 * - Now, someone starts the dependency manager shell bundle: B then shall be called in its "changed" callback.
 * 
 * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
 */
public class ModifiedBundleDependencyTest extends TestBase {
    public static interface A {
    }
    
    static class AImpl implements A {
    }
        
    public static interface B {
    }
    
    static class BImpl implements B {
        final Ensure m_e;
        
        BImpl(Ensure e) {
            m_e = e;
        }
        
        public void add(Bundle dmTest) {
            m_e.step(1);
        }

        void init(Component c) {
            m_e.step(2);
            component(c, comp -> comp.withSvc(A.class, srv -> srv.add("add").remove("remove")));
        }
        
        public void add(A a) {
            m_e.step(3);
        }
        
        public void start() {
            m_e.step(4);            
        }
        
        public void stop() {
            m_e.step(5);
        }

        public void remove(A a) {
            m_e.step(6);
        }

        public void change(Bundle dmTest) { // called two times: one for STARTING, one for STARTED
            m_e.step(); 
        }
        
        public void destroy() {
            m_e.step(9);
        }

        public void remove(Bundle dmTest) {   
            m_e.step(10);
        }                    
    }
    
    public void testAdapterWithChangedInstanceBoundDependencyAndCallbacks() {
        DependencyManager m = getDM();
        Ensure e = new Ensure();

        Component a = component(m).impl(new AImpl()).provides(A.class).build();
        
        String filter = "(Bundle-SymbolicName=org.apache.felix.metatype)";
        int mask = Bundle.INSTALLED|Bundle.ACTIVE|Bundle.RESOLVED|Bundle.STARTING;
        Component b = component(m)
            .provides(B.class).impl(new BImpl(e)).withBundle(bd -> bd.filter(filter).mask(mask).add("add").change("change").remove("remove")).build();     	
        						                    
        Bundle dmtest = getBundle("org.apache.felix.metatype");
        try {
            dmtest.stop();
        } catch (BundleException e1) {
            Assert.fail("could not find metatype bundle");
        }
        
        m.add(a);
        m.add(b);
        
        e.waitForStep(4, 5000);        
        m.remove(a); // B will loose A and will enter into "waiting for required (instantiated)" state.
        System.out.println("Starting metatype bundle ...");        
        try {
            dmtest.start();
        } catch (BundleException e1) {
            Assert.fail("could not start metatype bundle");
        }
        e.waitForStep(7, 5000);     
        m.remove(b);        
        e.waitForStep(10, 5000);                
    }

    public void testAdapterWithChangedInstanceBoundDependencyRef() {
        DependencyManager m = getDM();
        Ensure e = new Ensure();

        Component a = 
        	component(m, comp -> comp.impl(new AImpl()).provides(A.class).autoAdd(false));
        
        BImpl impl = new BImpl(e);
        String filter = "(Bundle-SymbolicName=org.apache.felix.metatype)";
        int mask = Bundle.INSTALLED|Bundle.ACTIVE|Bundle.RESOLVED|Bundle.STARTING;
        Component b = component(m).provides(B.class).impl(impl)
            .withBundle(bd -> bd.filter(filter).mask(mask).add(impl::add).change(impl::change).remove(impl::remove)).build();        	
        
        Bundle dmtest = getBundle("org.apache.felix.metatype");
        try {
            dmtest.stop();
        } catch (BundleException e1) {
            Assert.fail("could not find metatype bundle");
        }
        
        m.add(a);
        m.add(b);
        
        e.waitForStep(4, 5000);        
        m.remove(a); // B will loose A and will enter into "waiting for required (instantiated)" state.
        System.out.println("Starting metatype bundle ...");        
        try {
            dmtest.start();
        } catch (BundleException e1) {
            Assert.fail("could not start metatype bundle");
        }
        e.waitForStep(7, 5000);     
        m.remove(b);        
        e.waitForStep(10, 5000);                
    }
}