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package org.apache.cayenne.ashwood;

import java.util.Arrays;
import java.util.List;

import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.unit.di.server.CayenneProjects;
import org.apache.cayenne.unit.di.server.ServerCase;
import org.apache.cayenne.unit.di.server.UseServerRuntime;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

@UseServerRuntime(CayenneProjects.WEIGHTED_SORT_PROJECT)
public class WeightedAshwoodEntitySorterIT extends ServerCase {

    @Inject
    protected ObjectContext context;

    EntityResolver resolver;

    @Before
    public void setUp() throws Exception {
        this.resolver = context.getEntityResolver();
    }

    @Test
    public void testSortDbEntities() {
        // since it is impossible to ensure non-coincidental sort order of unrelated
        // DbEntities (without overriding DbEntity.hashCode()), we'll test on 2 entities
        // with a relationship, and reverse the topological order with SortWeight annotation.

        List<DbEntity> eSorted = Arrays.asList(resolver.getDbEntity("SORT_DEP"), resolver.getDbEntity("SORT_ROOT"));

        List<DbEntity> e1 = Arrays.asList(resolver.getDbEntity("SORT_ROOT"), resolver.getDbEntity("SORT_DEP"));

        List<DbEntity> e2 = Arrays.asList(resolver.getDbEntity("SORT_DEP"), resolver.getDbEntity("SORT_ROOT"));

        WeightedAshwoodEntitySorter sorter = new WeightedAshwoodEntitySorter();
        sorter.setEntityResolver(resolver);

        sorter.sortDbEntities(e1, false);
        assertEquals(eSorted, e1);

        sorter.sortDbEntities(e2, false);
        assertEquals(eSorted, e2);
    }
}