/**
 * Copyright 2005-2013 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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.kuali.rice.kns.service.impl;

import org.apache.commons.lang.StringUtils;
import org.junit.Test;
import org.kuali.rice.kew.api.exception.WorkflowException;
import org.kuali.rice.kim.api.KimConstants.PermissionNames;
import org.kuali.rice.kim.api.identity.Person;
import org.kuali.rice.kim.api.services.KimApiServiceLocator;
import org.kuali.rice.kns.KNSTestCase;
import org.kuali.rice.kns.authorization.AuthorizationConstants;
import org.kuali.rice.krad.UserSession;
import org.kuali.rice.krad.document.Document;
import org.kuali.rice.krad.document.authorization.PessimisticLock;
import org.kuali.rice.krad.exception.AuthorizationException;
import org.kuali.rice.krad.maintenance.MaintenanceDocument;
import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
import org.kuali.rice.krad.service.PessimisticLockService;
import org.kuali.rice.krad.service.impl.PessimisticLockServiceImpl;
import org.kuali.rice.krad.test.KRADTestCase;
import org.kuali.rice.krad.test.document.AccountRequestDocument;
import org.kuali.rice.krad.test.document.AccountRequestDocument2;
import org.kuali.rice.krad.util.GlobalVariables;
import org.kuali.rice.krad.util.KRADConstants;
import org.kuali.rice.krad.util.KRADPropertyConstants;
import org.kuali.rice.kns.maintainable.AccountType2MaintainableImpl;
import org.kuali.rice.test.BaselineTestCase;
import org.kuali.rice.test.data.UnitTestData;
import org.kuali.rice.test.data.UnitTestSql;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static org.junit.Assert.*;

/**
 * PessimisticLockServiceTest tests {@link PessimisticLockServiceImpl} for maintainable
 *
 * @author Kuali Rice Team (rice.collab@kuali.org)
 */
@BaselineTestCase.BaselineMode(BaselineTestCase.Mode.NONE)
public class PessimisticLockServiceTest extends KNSTestCase {

    String sessionId = "ad4d6c83-4d0f-4309-a528-c2f81ec00395";

    @Override
    public void setUp() throws Exception {
        super.setUp();
        GlobalVariables.setUserSession(new UserSession("quickstart"));
        GlobalVariables.getUserSession().setKualiSessionId(sessionId);
    }

    /**
     * tests the PessimisticLockService's ability to establish pessimistic locks for maintenance documents (via maintainables) that
     * support custom lock descriptors
     * 
     * @throws Exception
     */
    @Test
    public void testPessimisticLockingWithCustomMaintainableLockDescriptors() throws Exception {
        MaintenanceDocument maintDoc = (MaintenanceDocument) KRADServiceLocatorWeb.getDocumentService().getNewDocument("AccountType2MaintenanceDocument");
        assertTrue("The AccountType2MaintenanceDocument should be using pessimistic locking", KRADServiceLocatorWeb.getDataDictionaryService().getDataDictionary(
                        ).getDocumentEntry(maintDoc.getNewMaintainableObject().getDataObjectClass().getSimpleName() + "MaintenanceDocument").getUsePessimisticLocking());
        assertTrue("The AccountType2MaintenanceDocument should be using custom lock descriptors", maintDoc.useCustomLockDescriptors());
        assertTrue("The AccountType2MaintenanceDocument's new maintainable uses the wrong class",
                        maintDoc.getNewMaintainableObject() instanceof AccountType2MaintainableImpl);
        AccountType2MaintainableImpl newMaint = (AccountType2MaintainableImpl) maintDoc.getNewMaintainableObject();
        assertTrue("The AccountType2MaintainableImpl should be using custom lock descriptors", newMaint.useCustomLockDescriptors());
        
        // Perform the custom lock descriptor unit testing operations.
        assertCustomLockDescriptorsAreWorking(maintDoc, AccountType2MaintainableImpl.ACCT_TYPE_2_MAINT_FIELDS_TO_EDIT,
                        AccountType2MaintainableImpl.EDIT_CODE_ONLY, AccountType2MaintainableImpl.EDIT_NAME_ONLY);
    }
    
    /**
     * A convenience method for testing the custom lock descriptors of documents (and on the maintainables of maintenance documents).
     *
     * @param testDoc The document to test pessimistic locking on (or the maintenance document with maintainables to test on).
     * @param LOCK_KEY The UserSession object key to use for storing the lock descriptor's key.
     * @param LOCK_VALUE1 One possible object to store in a UserSession for generating lock descriptors on the testDoc.
     * @param LOCK_VALUE2 Another possible object to store in a UserSession for generating lock descriptors on the testDoc.
     *
     * @throws Exception
     */
    private void assertCustomLockDescriptorsAreWorking(Document testDoc, final String LOCK_KEY, final Serializable LOCK_VALUE1,
                final Serializable LOCK_VALUE2) throws Exception {
        PessimisticLockService lockService = KRADServiceLocatorWeb.getPessimisticLockService();

        // Have "quickstart" establish a pessimistic lock on the document by using a custom lock descriptor that only locks part of the document.
        UserSession quickstartSession = new UserSession("quickstart");
        Person[] allPersons = { quickstartSession.getPerson(), null };
        Map<String,String> editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE1);
        String[] allDescriptors = { testDoc.getCustomLockDescriptor(quickstartSession.getPerson()), null };
                assertNotNull("The document should have generated a custom lock descriptor", allDescriptors[0]);
        Map <?,?> finalModes = lockService.establishLocks(testDoc, editMode, quickstartSession.getPerson());

        // Verify that the lock was actually established and that the expected custom lock descriptor was used.
        assertCorrectLocksAreInPlace(true, finalModes, 1, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // Attempt to establish the same lock again, which should change nothing since "quickstart" already has the lock.
        editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE1);
        lockService.establishLocks(testDoc, editMode, quickstartSession.getPerson());
        assertCorrectLocksAreInPlace(false, null, 1, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // Now check to make sure that a different user (such as "admin") cannot establish a lock using the same lock descriptor.
        UserSession adminSession = new UserSession("admin");
        editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE1);
        assertEquals("The document should have generated the same lock descriptors for both 'quickstart' and 'admin'",
                        allDescriptors[0], testDoc.getCustomLockDescriptor(adminSession.getPerson()));
        finalModes = lockService.establishLocks(testDoc, editMode, adminSession.getPerson());
        assertCorrectLocksAreInPlace(false, finalModes, 1, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // Ensure that "admin" can establish a lock that has a different lock descriptor.
        allPersons[1] = adminSession.getPerson();
        editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE2);
        allDescriptors[1] = testDoc.getCustomLockDescriptor(adminSession.getPerson());
        assertNotNull("The document should have generated a custom lock descriptor", allDescriptors[1]);
        assertNotSame("'quickstart' and 'admin' should have different custom lock descriptors now", allDescriptors[0], allDescriptors[1]);
        finalModes = lockService.establishLocks(testDoc, editMode, adminSession.getPerson());
        assertCorrectLocksAreInPlace(true, finalModes, 2, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // Verify that "quickstart" cannot acquire the lock owned by "admin".
        editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE2);
        lockService.establishLocks(testDoc, editMode, quickstartSession.getPerson());
        assertCorrectLocksAreInPlace(false, null, 2, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // After "admin" releases his lock, check to make sure that "quickstart" can now acquire it.
        lockService.releaseAllLocksForUser(testDoc.getPessimisticLocks(), allPersons[1], allDescriptors[1]);
        testDoc.refreshPessimisticLocks();
        assertCorrectLocksAreInPlace(false, null, 1, testDoc.getPessimisticLocks(), allPersons, allDescriptors);
        allPersons[1] = allPersons[0];
        editMode = new HashMap<String,String>();
        editMode.put(AuthorizationConstants.EditMode.FULL_ENTRY, KRADConstants.KUALI_DEFAULT_TRUE_VALUE);
        GlobalVariables.getUserSession().addObject(LOCK_KEY, LOCK_VALUE2);
        finalModes = lockService.establishLocks(testDoc, editMode, quickstartSession.getPerson());
        assertCorrectLocksAreInPlace(true, finalModes, 2, testDoc.getPessimisticLocks(), allPersons, allDescriptors);

        // Release all the locks when done.
        GlobalVariables.getUserSession().removeObject(LOCK_KEY);
        lockService.releaseAllLocksForUser(testDoc.getPessimisticLocks(), allPersons[0]);
        testDoc.refreshPessimisticLocks();
        assertTrue("There should not be any pessimistic locks present on the document", testDoc.getPessimisticLocks().isEmpty());
    }

    /**
     * A convenience method for checking to ensure that the proper pessimistic locks are in place.
     *
     * @param latestUserHasFullEntry Indicates if the map returned by PessimisticLockService.establishLocks should have a true "fullEntry" parameter.
     * @param finalModes The map returned by the call to PessimisticLockService.establishLocks. This parameter can be null if checking it is not needed.
     * @param expectedLockQuantity The expected number of pessimistic locks.
     * @param pessimisticLocks The list of pessimistic locks to check for proper quantity and proper state.
     * @param expectedOwners The users who are expected to own the corresponding locks in the previous list.
     * @param expectedDescriptors The expected lock descriptors for the corresponding locks in the other list. This parameter can be set to null if
     * the pessimistic locks are not using custom lock descriptors or if custom lock descriptors are not the concern of the test.
     * @throws Exception
     */
    private void assertCorrectLocksAreInPlace(boolean latestUserHasFullEntry, Map<?,?> finalModes, int expectedLockQuantity,
                List<PessimisticLock> pessimisticLocks, Person[] expectedOwners, String[] expectedDescriptors) throws Exception {
        // Ensure that the last user to attempt to establish locks has the expected finalModes entry (or lack of it).
        if (finalModes != null) {
                assertEquals("The last user that tried to establish locks does not have the expected status on their full entry privileges",
                                latestUserHasFullEntry, StringUtils.equalsIgnoreCase(KRADConstants.KUALI_DEFAULT_TRUE_VALUE, (String)(finalModes.get(
                    AuthorizationConstants.EditMode.FULL_ENTRY))));
        }
        // Ensure that the expected number of locks are present.
        assertEquals("The wrong number of pessimistic locks are in place", expectedLockQuantity, pessimisticLocks.size());
        // Verify that each lock has the expected owners.
        for (int i = pessimisticLocks.size() - 1; i > -1; i--) {
                assertTrue("The lock at index " + i + " did not have the expected owner of " + expectedOwners[i].getPrincipalName(),
                        pessimisticLocks.get(i).isOwnedByUser(expectedOwners[i]));
                if (expectedDescriptors != null) {
                        assertTrue("The lock at index " + i + " did not have the expected lock descriptor of " + expectedDescriptors[i],
                                        pessimisticLocks.get(i).getLockDescriptor().equals(expectedDescriptors[i]));
                }
        }
    }
}