/*
 * Copyright 2012, 2013 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.storage.internal.dao;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import com.redhat.thermostat.storage.core.Category;
import com.redhat.thermostat.storage.core.Cursor;
import com.redhat.thermostat.storage.core.DescriptorParsingException;
import com.redhat.thermostat.storage.core.HostRef;
import com.redhat.thermostat.storage.core.Key;
import com.redhat.thermostat.storage.core.PreparedStatement;
import com.redhat.thermostat.storage.core.Replace;
import com.redhat.thermostat.storage.core.StatementDescriptor;
import com.redhat.thermostat.storage.core.StatementExecutionException;
import com.redhat.thermostat.storage.core.Storage;
import com.redhat.thermostat.storage.core.Update;
import com.redhat.thermostat.storage.core.VmRef;
import com.redhat.thermostat.storage.dao.DAOException;
import com.redhat.thermostat.storage.dao.VmInfoDAO;
import com.redhat.thermostat.storage.model.VmInfo;
import com.redhat.thermostat.storage.query.ExpressionFactory;

public class VmInfoDAOTest {

    private String vmId;
    private int vmPid;
    private long startTime;
    private long stopTime;
    private String jVersion;
    private String jHome;
    private String mainClass;
    private String commandLine;
    private String vmName;
    private String vmInfo;
    private String vmVersion;
    private String vmArgs;
    private Map<String, String> props;
    private Map<String, String> env;
    private String[] libs;
    private long uid;
    private String username;

    @Before
    public void setUp() {
        vmId = "vmId";
        vmPid = 1;
        startTime = 2;
        stopTime = 3;
        jVersion = "java 1.0";
        jHome = "/path/to/jdk/home";
        mainClass = "Hello.class";
        commandLine = "World";
        vmArgs = "-XX=+FastestJITPossible";
        vmName = "Hotspot";
        vmInfo = "Some info";
        vmVersion = "1.0";
        props = new HashMap<>();
        env = new HashMap<>();
        libs = new String[0];
        uid = 2000;
        username = "myUser";
    }
    
    @Test
    public void preparedQueryDescriptorsAreSane() {
        String expectedVmInfo = "QUERY vm-info WHERE 'agentId' = ?s AND 'vmId' = ?s LIMIT 1";
        assertEquals(expectedVmInfo, VmInfoDAOImpl.QUERY_VM_INFO);
        String expectedVmInfoAll = "QUERY vm-info WHERE 'agentId' = ?s";
        assertEquals(expectedVmInfoAll, VmInfoDAOImpl.QUERY_ALL_VMS);
    }

    @Test
    public void testCategory() {
        assertEquals("vm-info", VmInfoDAO.vmInfoCategory.getName());
        Collection<Key<?>> keys = VmInfoDAO.vmInfoCategory.getKeys();
        assertTrue(keys.contains(new Key<>("agentId", true)));
        assertTrue(keys.contains(new Key<Integer>("vmId", true)));
        assertTrue(keys.contains(new Key<Integer>("vmPid", false)));
        assertTrue(keys.contains(new Key<String>("javaVersion", false)));
        assertTrue(keys.contains(new Key<String>("javaHome", false)));
        assertTrue(keys.contains(new Key<String>("mainClass", false)));
        assertTrue(keys.contains(new Key<String>("javaCommandLine", false)));
        assertTrue(keys.contains(new Key<String>("vmArguments", false)));
        assertTrue(keys.contains(new Key<String>("vmName", false)));
        assertTrue(keys.contains(new Key<String>("vmInfo", false)));
        assertTrue(keys.contains(new Key<String>("vmVersion", false)));
        assertTrue(keys.contains(new Key<Map<String, String>>("properties", false)));
        assertTrue(keys.contains(new Key<Map<String, String>>("environment", false)));
        assertTrue(keys.contains(new Key<List<String>>("loadedNativeLibraries", false)));
        assertTrue(keys.contains(new Key<Long>("startTimeStamp", false)));
        assertTrue(keys.contains(new Key<Long>("stopTimeStamp", false)));
        assertTrue(keys.contains(new Key<Long>("uid", false)));
        assertTrue(keys.contains(new Key<Long>("username", false)));
        assertEquals(18, keys.size());
    }

    @Test
    public void testGetVmInfo() throws DescriptorParsingException, StatementExecutionException {
        Storage storage = mock(Storage.class);
        @SuppressWarnings("unchecked")
        PreparedStatement<VmInfo> stmt = (PreparedStatement<VmInfo>) mock(PreparedStatement.class);
        when(storage.prepareStatement(anyDescriptor())).thenReturn(stmt);
        VmInfo expected = new VmInfo(vmId, vmPid, startTime, stopTime, jVersion, jHome, mainClass, commandLine, vmName, vmInfo, vmVersion, vmArgs, props, env, libs, uid, username);
        @SuppressWarnings("unchecked")
        Cursor<VmInfo> cursor = (Cursor<VmInfo>) mock(Cursor.class);
        when(cursor.hasNext()).thenReturn(true).thenReturn(false);
        when(cursor.next()).thenReturn(expected).thenReturn(null);
        when(stmt.executeQuery()).thenReturn(cursor);

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

        VmRef vmRef = mock(VmRef.class);
        when(vmRef.getHostRef()).thenReturn(hostRef);
        when(vmRef.getVmId()).thenReturn("vmId");

        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        VmInfo info = dao.getVmInfo(vmRef);
        assertEquals(expected, info);
        
        verify(storage).prepareStatement(anyDescriptor());
        verify(stmt).setString(0, "system");
        verify(stmt).setString(1, "vmId");
        verify(stmt).executeQuery();
    }

    @SuppressWarnings("unchecked")
    private StatementDescriptor<VmInfo> anyDescriptor() {
        return (StatementDescriptor<VmInfo>) any(StatementDescriptor.class);
    }

    @Test
    public void testGetVmInfoUnknownVM() throws DescriptorParsingException, StatementExecutionException {
        Storage storage = mock(Storage.class);
        @SuppressWarnings("unchecked")
        PreparedStatement<VmInfo> stmt = (PreparedStatement<VmInfo>) mock(PreparedStatement.class);
        when(storage.prepareStatement(anyDescriptor())).thenReturn(stmt);
        @SuppressWarnings("unchecked")
        Cursor<VmInfo> cursor = (Cursor<VmInfo>) mock(Cursor.class);
        when(stmt.executeQuery()).thenReturn(cursor);
        
        HostRef hostRef = mock(HostRef.class);
        when(hostRef.getAgentId()).thenReturn("system");

        VmRef vmRef = mock(VmRef.class);
        when(vmRef.getVmId()).thenReturn("noVm");
        when(vmRef.getHostRef()).thenReturn(hostRef);

        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        try {
            dao.getVmInfo(vmRef);
            fail();
        } catch (DAOException ex) {
            assertEquals("Unknown VM: host:system;vm:noVm", ex.getMessage());
        }

        verify(storage).prepareStatement(anyDescriptor());
        verify(stmt).setString(0, "system");
        verify(stmt).setString(1, "noVm");
        verify(stmt).executeQuery();
    }

    @Test
    public void testSingleVM() throws DescriptorParsingException, StatementExecutionException {
        Storage storage = setupStorageForSingleVM();
        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        HostRef host = new HostRef("123", "fluffhost");

        Collection<VmRef> vms = dao.getVMs(host);

        assertCollection(vms, new VmRef(host, "vmId", 123, "mainClass1"));
    }

    private Storage setupStorageForSingleVM() throws DescriptorParsingException, StatementExecutionException {

      VmInfo vm1 = new VmInfo();
      vm1.setVmId("vmId");
      vm1.setVmPid(123);
      vm1.setMainClass("mainClass1");

      @SuppressWarnings("unchecked")
      Cursor<VmInfo> singleVMCursor = (Cursor<VmInfo>) mock(Cursor.class);
      when(singleVMCursor.hasNext()).thenReturn(true).thenReturn(false);
      when(singleVMCursor.next()).thenReturn(vm1);

      Storage storage = mock(Storage.class);
      @SuppressWarnings("unchecked")
      PreparedStatement<VmInfo> stmt = (PreparedStatement<VmInfo>) mock(PreparedStatement.class);
      when(storage.prepareStatement(anyDescriptor())).thenReturn(stmt);
      when(stmt.executeQuery()).thenReturn(singleVMCursor);
      return storage;
  }

    @Test
    public void testMultiVMs() throws DescriptorParsingException, StatementExecutionException {
        Storage storage = setupStorageForMultiVM();
        VmInfoDAO dao = new VmInfoDAOImpl(storage);

        HostRef host = new HostRef("456", "fluffhost");

        Collection<VmRef> vms = dao.getVMs(host);

        assertCollection(vms, new VmRef(host, "vmId1", 123, "mainClass1"), new VmRef(host, "vmId2", 456, "mainClass2"));
    }

    private Storage setupStorageForMultiVM() throws DescriptorParsingException, StatementExecutionException {
      VmInfo vm1 = new VmInfo();
      vm1.setVmId("vmId1");
      vm1.setVmPid(123);
      vm1.setMainClass("mainClass1");

      VmInfo vm2 = new VmInfo();
      vm2.setVmId("vmId2");
      vm2.setVmPid(456);
      vm2.setMainClass("mainClass2");

      @SuppressWarnings("unchecked")
      Cursor<VmInfo> multiVMsCursor = mock(Cursor.class);
      when(multiVMsCursor.hasNext()).thenReturn(true).thenReturn(true).thenReturn(false);
      when(multiVMsCursor.next()).thenReturn(vm1).thenReturn(vm2);

      Storage storage = mock(Storage.class);
      @SuppressWarnings("unchecked")
      PreparedStatement<VmInfo> stmt = (PreparedStatement<VmInfo>) mock(PreparedStatement.class);
      when(storage.prepareStatement(anyDescriptor())).thenReturn(stmt);
      when(stmt.executeQuery()).thenReturn(multiVMsCursor);
      return storage;
  }

    private void assertCollection(Collection<VmRef> vms, VmRef... expectedVMs) {
        assertEquals(expectedVMs.length, vms.size());
        for (VmRef expectedVM : expectedVMs) {
            assertTrue(vms.contains(expectedVM));
        }
    }

    @Test
    public void testGetCount() {
        Storage storage = mock(Storage.class);
        when(storage.getCount(any(Category.class))).thenReturn(5L);
        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        Long count = dao.getCount();
        assertEquals((Long) 5L, count);
    }

    @Test
    public void testPutVmInfo() {

        Storage storage = mock(Storage.class);
        Replace replace = mock(Replace.class);
        when(storage.createReplace(any(Category.class))).thenReturn(replace);

        VmInfo info = new VmInfo(vmId, vmPid, startTime, stopTime, jVersion, jHome,
                mainClass, commandLine, vmName, vmInfo, vmVersion, vmArgs,
                props, env, libs, uid, username);
        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        dao.putVmInfo(info);

        verify(storage).createReplace(VmInfoDAO.vmInfoCategory);
        verify(replace).setPojo(info);
        verify(replace).apply();
    }

    @Test
    public void testPutVmStoppedTime() {
        Update mockUpdate = mock(Update.class);
        Storage storage = mock(Storage.class);
        when(storage.createUpdate(any(Category.class))).thenReturn(mockUpdate);

        VmInfoDAO dao = new VmInfoDAOImpl(storage);
        dao.putVmStoppedTime(vmId, stopTime);

        verify(storage).createUpdate(VmInfoDAO.vmInfoCategory);
        ExpressionFactory factory = new ExpressionFactory();
        verify(mockUpdate).where(factory.equalTo(Key.VM_ID, "vmId"));
        verify(mockUpdate).set(VmInfoDAO.stopTimeKey, 3L);
        verify(mockUpdate).apply();
        verifyNoMoreInteractions(mockUpdate);
    }
}