/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.vm.classstat.agent.internal;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.redhat.thermostat.jvm.overview.agent.VmStatusListenerRegistrar;

import org.junit.Test;
import org.junit.Before;

import com.redhat.thermostat.storage.core.WriterID;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;

public class VmClassStatBackendTest {

    private TestVmClassBackend backend;
    private VmClassStatBackend.ListenerCreator listenerCreator;

    @Before
    public void setup() {
        listenerCreator = mock(VmClassStatBackend.ListenerCreator.class);
        backend = new TestVmClassBackend(listenerCreator);
    }

    @Test
    public void testComponentActivated() {
        BundleContext context = mock(BundleContext.class);
        Bundle bundle = mock(Bundle.class);
        org.osgi.framework.Version version = new org.osgi.framework.Version(1, 2, 3);
        when(bundle.getVersion()).thenReturn(version);
        when(context.getBundle()).thenReturn(bundle);

        WriterID id = mock(WriterID.class);
        backend.bindWriterId(id);
        backend.componentActivated(context);

        assertEquals(id, backend.writerId);
        assertEquals("1.2.3", backend.version);
        assertNotNull(backend.registrar);
    }

    @Test
    public void testComponentDeactivated() {
        // Begin with backend appearing active for this test
        backend.active = true;

        assertTrue(backend.isActive());
        backend.componentDeactivated();
        assertFalse(backend.isActive());
    }

    @Test
    public void testCreateVmListener() {
        final String writerId = "myAgent";
        final String jvmId = "mhJVM";
        final int pid = 1234;

        VmClassStatDAO dao = mock(VmClassStatDAO.class);
        backend.bindVmClassStatDao(dao);
        backend.createVmListener(writerId, jvmId, pid);

        verify(listenerCreator).create(writerId, dao, jvmId);
    }

    static class TestVmClassBackend extends VmClassStatBackend {
        WriterID writerId;
        VmStatusListenerRegistrar registrar;
        String version;
        boolean active;

        TestVmClassBackend(ListenerCreator creator) {
            super(creator);
        }

        // Override to capture values
        @Override
        protected void initialize(WriterID writerId, VmStatusListenerRegistrar registrar, String version) {
            this.writerId = writerId;
            this.registrar = registrar;
            this.version = version;
        }

        // Override the following to test backend is deactivated when dependencies are lost
        @Override
        public boolean isActive() {
            return active;
        }

        @Override
        public boolean deactivate() {
            active = false;
            return true;
        }
    }

}