/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.tests.api.support.undoRedoSupport;

import java.util.Arrays;

import org.junit.Test;
import org.simantics.databoard.Bindings;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.Session;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.service.UndoRedoSupport;
import org.simantics.db.testing.base.ExistingDatabaseTest;
import org.simantics.layer0.Layer0;
import org.simantics.utils.DataContainer;

/**
 * Tests undo of deletion of large literal when done twice in sequence.
 * This was added because of Bug #4591.
 */
public class UndoTest20 extends ExistingDatabaseTest {
    private void initValue(byte[] value) {
        for (int i=0; i<value.length; ++i)
            value[i] = (byte)i;
    }

    @Test
    public void testUndo20() throws Exception {
        Session session = getSession();
        final byte[] value = new byte[100000];
        initValue(value);
        final DataContainer<Resource> subject1 = new DataContainer<Resource>();
        try {
            session.syncRequest(new WriteRequest() {
                @Override
                public void perform(WriteGraph graph) throws DatabaseException {
                    graph.markUndoPoint();
                    Layer0 b = Layer0.getInstance(graph);
                    Resource s1 = graph.newResource();
                    graph.claim(s1, b.InstanceOf, b.Entity);
                    graph.claimValue(s1, value);
                    subject1.set(s1);
                }
            });
        } catch (Throwable e) {
            fail("Write transaction threw an unknown exception ", e);
        }
        testUndo(session, value, subject1);
        testUndo(session, value, subject1);
    }
    public void testUndo(final Session session, final byte[] value, final DataContainer<Resource> subject1)
    throws Exception {
        final UndoRedoSupport support = session.getService(UndoRedoSupport.class);
        try {
            session.syncRequest(new ReadRequest() {
                @Override
                public void run(ReadGraph graph) throws DatabaseException {
                    Resource s1 = subject1.get();
                    byte[] t1 = graph.getValue(s1, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t1, value))
                        fail("Failed to verify value.");
                }
            });
        } catch (Throwable e) {
            fail("Read transaction threw an unexpected exception ", e);
        }
        try {
            session.syncRequest(new WriteRequest() {
                @Override
                public void perform(WriteGraph graph) throws DatabaseException {
                    graph.markUndoPoint();
                    Resource s1 = subject1.get();
                    graph.denyValue(s1);
                }
            });
        } catch (Throwable e) {
            fail("Write transaction threw an unknown exception ", e);
        }
        try {
            session.syncRequest(new ReadRequest() {
                @Override
                public void run(ReadGraph graph) throws DatabaseException {
                    Resource s1 = subject1.get();
                    byte[] t1 = graph.getPossibleValue(s1, Bindings.BYTE_ARRAY);
                    if (null != t1)
                        fail("Failed to verify delettion of value.");
                }
            });
        } catch (Throwable e) {
            fail("Read transaction threw an unexpected exception ", e);
        }
        try {
            support.undo(session, 1);
        } catch (Throwable e) {
            fail("Undo operation threw an unexpected exception.", e);
        }
        try {
            session.syncRequest(new ReadRequest() {
                @Override
                public void run(ReadGraph graph) throws DatabaseException {
                    Resource s1 = subject1.get();
                    byte[] t1 = graph.getValue(s1, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t1, value))
                        fail("Failed to verify value1.");
                }
            });
        } catch (Throwable e) {
            fail("Read transaction threw an unexpected exception ", e);
        }
    }
}