/*
 * Copyright 2012 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.common.dao;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.same;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.util.Collection;
import java.util.List;

import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import com.redhat.thermostat.common.model.VmClassStat;
import com.redhat.thermostat.common.storage.Cursor;
import com.redhat.thermostat.common.storage.Key;
import com.redhat.thermostat.common.storage.Query;
import com.redhat.thermostat.common.storage.Cursor.SortDirection;
import com.redhat.thermostat.common.storage.Query.Criteria;
import com.redhat.thermostat.common.storage.Storage;
import com.redhat.thermostat.test.MockQuery;

public class VmClassStatDAOTest {

    private static final Long TIMESTAMP = 1234L;
    private static final Integer VM_ID = 123;
    private static final Long LOADED_CLASSES = 12345L;

    @Test
    public void testCategory() {
        assertEquals("vm-class-stats", VmClassStatDAO.vmClassStatsCategory.getName());
        Collection<Key<?>> keys = VmClassStatDAO.vmClassStatsCategory.getKeys();
        assertTrue(keys.contains(new Key<>("agentId", true)));
        assertTrue(keys.contains(new Key<Integer>("vmId", true)));
        assertTrue(keys.contains(new Key<Long>("timeStamp", false)));
        assertTrue(keys.contains(new Key<Long>("loadedClasses", false)));
        assertEquals(4, keys.size());

    }

    @Test
    public void testGetLatestClassStatsBasic() {

        VmClassStat vmClassStat = getClassStat();

        @SuppressWarnings("unchecked")
        Cursor<VmClassStat> cursor = mock(Cursor.class);
        when(cursor.hasNext()).thenReturn(true).thenReturn(false);
        when(cursor.next()).thenReturn(vmClassStat);
        when(cursor.sort(any(Key.class), any(SortDirection.class))).thenReturn(cursor);

        Storage storage = mock(Storage.class);
        when(storage.createQuery()).then(new Answer<Query>() {
            @Override
            public Query answer(InvocationOnMock invocation) throws Throwable {
                return new MockQuery();
            }
        });
        when(storage.findAllPojos(any(Query.class), same(VmClassStat.class))).thenReturn(cursor);

        HostRef hostRef = mock(HostRef.class);
        when(hostRef.getAgentId()).thenReturn("system");

        VmRef vmRef = mock(VmRef.class);
        when(vmRef.getAgent()).thenReturn(hostRef);
        when(vmRef.getId()).thenReturn(321);


        VmClassStatDAO dao = new VmClassStatDAOImpl(storage);
        List<VmClassStat> vmClassStats = dao.getLatestClassStats(vmRef);

        ArgumentCaptor<MockQuery> arg = ArgumentCaptor.forClass(MockQuery.class);
        verify(storage).findAllPojos(arg.capture(), same(VmClassStat.class));
        assertFalse(arg.getValue().hasWhereClauseFor(Key.TIMESTAMP));

        assertEquals(1, vmClassStats.size());
        VmClassStat stat = vmClassStats.get(0);
        assertEquals(TIMESTAMP, (Long) stat.getTimeStamp());
        assertEquals(LOADED_CLASSES, (Long) stat.getLoadedClasses());
        assertEquals(VM_ID, (Integer) stat.getVmId());
    }

    @Test
    public void testGetLatestClassStatsTwice() {

        VmClassStat vmClassStat = getClassStat();

        @SuppressWarnings("unchecked")
        Cursor<VmClassStat> cursor = mock(Cursor.class);

        when(cursor.hasNext()).thenReturn(true).thenReturn(false);
        when(cursor.next()).thenReturn(vmClassStat);
        when(cursor.sort(any(Key.class), any(SortDirection.class))).thenReturn(cursor);

        Storage storage = mock(Storage.class);
        when(storage.createQuery()).then(new Answer<Query>() {
            @Override
            public Query answer(InvocationOnMock invocation) throws Throwable {
                return new MockQuery();
            }
        });
        when(storage.findAllPojos(any(Query.class), same(VmClassStat.class))).thenReturn(cursor);

        HostRef hostRef = mock(HostRef.class);
        when(hostRef.getAgentId()).thenReturn("system");

        VmRef vmRef = mock(VmRef.class);
        when(vmRef.getAgent()).thenReturn(hostRef);
        when(vmRef.getId()).thenReturn(321);


        VmClassStatDAO dao = new VmClassStatDAOImpl(storage);
        dao.getLatestClassStats(vmRef);

        dao.getLatestClassStats(vmRef);
        ArgumentCaptor<MockQuery> arg = ArgumentCaptor.forClass(MockQuery.class);
        verify(storage, times(2)).findAllPojos(arg.capture(), same(VmClassStat.class));
        assertTrue(arg.getValue().hasWhereClause(Key.TIMESTAMP, Criteria.GREATER_THAN, 1234l));
    }

    private VmClassStat getClassStat() {
        return new VmClassStat(VM_ID, TIMESTAMP, LOADED_CLASSES);
    }

    @Test
    public void testPutVmClassStat() {

        Storage storage = mock(Storage.class);
        VmClassStat stat = new VmClassStat(VM_ID, TIMESTAMP, LOADED_CLASSES);
        VmClassStatDAO dao = new VmClassStatDAOImpl(storage);
        dao.putVmClassStat(stat);

        verify(storage).putPojo(VmClassStatDAO.vmClassStatsCategory, false, stat);
    }
}