/*******************************************************************************
 * 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 two changes sets with values modified in multiple cluster change sets.
 * The binary values will cause two cluster change sets per modification.
 * (By the way the above-mentioned behavior will cause serious fragmentation in server
 * because the size of cluster change sets are ridiculously small and server does not
 * process cluster change sets but stores them as is. The payload is just about the same
 * as the bookkeeping structures. TODO: fix the aforementioned fragmentation)
 */
public class UndoTest18 extends ExistingDatabaseTest {
    private void initValue(byte[] value) {
        for (int i=0; i<value.length; ++i)
            value[i] = (byte)i;
    }

    @Test
    public void testUndo1() throws Exception {

        Session session = getSession();
        final UndoRedoSupport support = session.getService(UndoRedoSupport.class);
        final DataContainer<Resource> subject1 = new DataContainer<Resource>();
        final DataContainer<Resource> subject2 = new DataContainer<Resource>();
        final byte[] value10 = new byte[100000];
        final byte[] value20 = new byte[100001];
        final byte[] value11 = new byte[100002];
        final byte[] value21 = new byte[100003];

        try {
            initValue(value10);
            initValue(value11);
            initValue(value20);
            initValue(value21);
            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, value10);
                    subject1.set(s1);
                }
            });
        } catch (Throwable e) {
            fail("Write transaction threw an unknown exception ", e);
        }

        try {
            session.syncRequest(new WriteRequest() {
                @Override
                public void perform(WriteGraph graph) throws DatabaseException {
                    graph.markUndoPoint();
                    Layer0 b = Layer0.getInstance(graph);
                    Resource s2 = graph.newResource();
                    graph.claim(s2, b.InstanceOf, b.Entity);
                    graph.claimValue(s2, value20);
                    subject2.set(s2);
                }
            });
        } 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.getValue(s1, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t1, value10))
                        fail("Failed to verify value1.");
                    Resource s2 = subject2.get();
                    byte[] t2 = graph.getValue(s2, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t2, value20))
                        fail("Failed to verify value2.");
                }
            });
        } 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();
                    graph.newResource();
                }
            });
        } catch (Throwable e) {
            fail("Write transaction threw an unknown exception ", e);
        }

        try {
            session.syncRequest(new WriteRequest() {
                @Override
                public void perform(WriteGraph graph) throws DatabaseException {
                    graph.markUndoPoint();
                    Layer0 b = Layer0.getInstance(graph);
                    Resource s1 = subject1.get();
                    graph.claim(s1, b.InstanceOf, b.Entity);
                    graph.claimValue(s1, value11);
                    subject1.set(s1);
                    Resource s2 = subject2.get();
                    graph.claim(s2, b.InstanceOf, b.Entity);
                    graph.claimValue(s2, value21);
                    subject2.set(s2);
                }
            });
        } 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.getValue(s1, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t1, value11))
                        fail("Failed to verify value11.");
                    Resource s2 = subject2.get();
                    byte[] t2 = graph.getValue(s2, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t2, value21))
                        fail("Failed to verify value21.");
                }
            });
        } catch (Throwable e) {
            fail("Read transaction threw an unexpected exception ", e);
        }

        try {
            support.undo(session, 2);
        } 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, value10))
                        fail("Failed to verify value1.");
                    Resource s2 = subject2.get();
                    byte[] t2 = graph.getValue(s2, Bindings.BYTE_ARRAY);
                    if (!Arrays.equals(t2, value20))
                        fail("Failed to verify value2.");
                }
            });
        } catch (Throwable e) {
            fail("Read transaction threw an unexpected exception ", e);
        }

    }

}