/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.tuscany.sca.guardian.itests;

import java.io.FileInputStream;
import org.apache.tuscany.sca.policy.resolutiontrees.*;
import org.apache.tuscany.sca.guardian.ResolutionTreeUtils;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import org.junit.Test;
import org.apache.axiom.om.OMElement;
import java.util.List;
import junit.framework.Assert;
import org.junit.Before;

public class LCATestCase {

    private ResolutionTreeUtils treeUtils;

    @Before
    public void init() throws Exception {
        ResolutionTreesPolicyProcessor processor = new ResolutionTreesPolicyProcessor(null, null);

        FileInputStream fileInputStream = new FileInputStream("src/main/resources/lcaTest.xml");
        XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(fileInputStream);


        ResolutionTreesPolicy policy = processor.read(reader);
        Map<String, OMElement> resolutionTrees = policy.getResolutionTreeElements();

        List<OMElement> rootElements = getRootElements(resolutionTrees.values());

        treeUtils = new ResolutionTreeUtils();
        treeUtils.setRoot(rootElements.get(0));
    }

    @Test
    public void testLCAEx2Ex2() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception2", "Exception2");
        System.out.println("lca: " + lca);
        Assert.assertEquals("Exception2", lca);
    }

    @Test
    public void testLCAEx2Ex3() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception2", "Exception3");
        Assert.assertEquals("Exception1", lca);
    }

    @Test
    public void testLCAEx2Ex8() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception2", "Exception8");
        Assert.assertEquals("Exception1", lca);
    }

    @Test
    public void testLCAEx4Ex3() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception4", "Exception3");
        Assert.assertEquals("Exception1", lca);
    }

    @Test
    public void testLCAEx4Ex5() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception4", "Exception5");
        Assert.assertEquals("Exception2", lca);
    }

    @Test
    public void testLCAEx6Ex7() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception6", "Exception7");
        Assert.assertEquals("Exception3", lca);
    }

    @Test
    public void testLCAEx1Ex8() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception1", "Exception8");
        Assert.assertEquals("Exception1", lca);
    }

    @Test
    public void testLCAEx2Ex5() throws Exception {
        String lca = treeUtils.getLowestCommonAncestor("Exception2", "Exception5");
        Assert.assertEquals("Exception2", lca);
    }

    private List<OMElement> getRootElements(Collection<OMElement> resolutionTrees) {
        List<OMElement> rootElements = new LinkedList<OMElement>();

        for (OMElement resolutionTree : resolutionTrees) {
            rootElements.add(resolutionTree.getFirstElement());
        }

        return rootElements;
    }
}