package net.floodlightcontroller.core.internal;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;

import org.easymock.EasyMock;
import org.easymock.IAnswer;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

// Extends Controller class to access protected inner class
public class RoleChangeCallbackTest extends Controller {
    @Before
    public void setUp() throws Exception {
    }

    @After
    public void tearDown() throws Exception {
    }

    /**
     * Test if {@link RoleChangeCallback#controlChanged(long, boolean)} correctly calls {@link RoleChanger#submitRequest(Collection, net.floodlightcontroller.core.IFloodlightProviderService.Role)}
     * when connectedSwitch is not empty.
     *
     * @throws Exception
     */
    @SuppressWarnings("unchecked")
    @Test
    public void testNormalSwitches() throws Exception {
        Long[] dpids = new Long[]{1000L, 1001L, 1002L, 1003L};
        final long dpidExist = 1000L;
        final long dpidNotExist = 2000L;

        roleChanger = EasyMock.createMock(RoleChanger.class);

        // First call will be called with (dpidExist,true)
        roleChanger.submitRequest(EasyMock.anyObject(Collection.class), EasyMock.anyObject(Role.class));
        EasyMock.expectLastCall().andAnswer(new IAnswer<Object>() {
            @Override
            public Object answer() throws Throwable {
                Collection<OFSwitchImpl> switches = (Collection<OFSwitchImpl>) EasyMock.getCurrentArguments()[0];
                Role role = (Role) EasyMock.getCurrentArguments()[1];

                List<Long> dpids = new ArrayList<Long>();

                for (OFSwitchImpl sw : switches) {
                    dpids.add(sw.getId());
                }
                assertTrue(dpids.contains(dpidExist));
                assertEquals(role, Role.MASTER);

                return null;
            }
        }).once();

        // Second call will be called with (dpidExist,false)
        roleChanger.submitRequest(EasyMock.anyObject(Collection.class), EasyMock.anyObject(Role.class));
        EasyMock.expectLastCall().andAnswer(new IAnswer<Object>() {
            @Override
            public Object answer() throws Throwable {
                Collection<OFSwitchImpl> switches = (Collection<OFSwitchImpl>) EasyMock.getCurrentArguments()[0];
                Role role = (Role) EasyMock.getCurrentArguments()[1];

                List<Long> dpids = new ArrayList<Long>();

                for (OFSwitchImpl sw : switches) {
                    dpids.add(sw.getId());
                }
                assertTrue(dpids.contains(dpidExist));
                assertEquals(role, Role.SLAVE);

                return null;
            }
        }).once();

        EasyMock.replay(roleChanger);

        initNetwork(roleChanger, dpids);

        RoleChangeCallback callback = new RoleChangeCallback();
        callback.controlChanged(dpidExist, true);
        callback.controlChanged(dpidExist, false);
        callback.controlChanged(dpidNotExist, true);
        callback.controlChanged(dpidNotExist, false);

        EasyMock.verify(roleChanger);
    }

    /**
     * Test if {@link RoleChangeCallback#controlChanged(long, boolean)} doesn't call RoleChanger methods
     * when connectedSwitch is empty.
     *
     * @throws Exception
     */
    @Test
    public void testEmptySwitches() throws Exception {
        Long[] dpids = new Long[]{};
        final long dpidToTest = 1000L;

        roleChanger = EasyMock.createMock(RoleChanger.class);
        // roleChanger methods must not be used
        EasyMock.replay(roleChanger);

        initNetwork(roleChanger, dpids);

        RoleChangeCallback callback = new RoleChangeCallback();
        callback.controlChanged(dpidToTest, true);
        callback.controlChanged(dpidToTest, false);

        EasyMock.verify(roleChanger);
    }

    /**
     * Create mock OFSwitchImpl object.
     *
     * @param id
     * @return
     */
    private OFSwitchImpl createOFSwitchImplMock(Long id) {
        OFSwitchImpl sw = EasyMock.createMock(OFSwitchImpl.class);

        EasyMock.expect(sw.getId()).andReturn(id).anyTimes();
        EasyMock.replay(sw);

        return sw;
    }

    /**
     * Setup connectedSwitches
     *
     * @param changer
     * @param ids
     * @throws Exception
     */
    private void initNetwork(RoleChanger changer, Long[] ids) throws Exception {
        connectedSwitches = new HashSet<OFSwitchImpl>();

        for (Long id : ids) {
            connectedSwitches.add(createOFSwitchImplMock(id));
        }
    }
}