/*
 * Copyright 2005-2011 the original author or authors.
 * 
 * Licensed 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.wamblee.xmlrouter.impl;

import static junit.framework.Assert.*;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.xml.transform.dom.DOMSource;

import org.junit.Before;
import org.junit.Test;
import org.wamblee.xmlrouter.common.Id;
import org.wamblee.xmlrouter.config.Transformation;

public class TransformationsTest {

    public static class MyTransformation implements Transformation {

        private String from;
        private String to;

        public MyTransformation(String aFrom, String aTo) {
            from = aFrom;
            to = aTo;
        }

        @Override
        public String getName() {
            return "myname";
        }

        @Override
        public String getFromType() {
            return from;
        }

        @Override
        public String getToType() {
            return to;
        }

        @Override
        public DOMSource transform(DOMSource aDocument) {
            return null;
        }

        @Override
        public String toString() {
            return from + "->" + to;
        }
    }

    private Transformations transformations;

    @Before
    public void setUp() {
        transformations = new Transformations();
    }

    private Map<Id<Transformation>, Transformation> createTransformations(
        long aStartId, Transformation... aTransformations) {
        Map<Id<Transformation>, Transformation> res = new LinkedHashMap<Id<Transformation>, Transformation>();

        long id = aStartId;
        for (Transformation t : aTransformations) {
            res.put(new Id<Transformation>(id++), t);
        }
        return res;
    }

    @Test
    public void testOneTransformation() {
        transformations.replaceTransformations(createTransformations(10L,
            new MyTransformation("A", "B")));

        System.out.println(transformations.toString());
        TransformationPath path = transformations.getPath("A", "B");
        assertEquals(1, path.size());
        assertNull(transformations.getPath("B", "A"));

        assertEquals(0, transformations.getPath("A", "A").size());
        assertEquals(0, transformations.getPath("B", "B").size());

        Collection<String> possibleTargets = transformations
            .getPossibleTargetTypes("A");
        assertEquals(2, possibleTargets.size());
        assertTrue(possibleTargets.contains("A"));
        assertTrue(possibleTargets.contains("B"));
    }

    @Test
    public void testMultipleTransformations() {
        transformations.replaceTransformations(createTransformations(10L,
            new MyTransformation("A", "B"), new MyTransformation("B", "C"),
            new MyTransformation("C", "A")));

        System.out.println(transformations);
        assertEquals(2, transformations.getPath("C", "B").size());

        transformations.replaceTransformations(createTransformations(10L,
            new MyTransformation("B", "C"), new MyTransformation("C", "A")));

        assertNull(transformations.getPath("C", "B"));
    }

    @Test
    public void testUnknownDestination() {
        transformations.replaceTransformations(createTransformations(10L,
            new MyTransformation("A", "B")));
        assertNull(transformations.getPath("A", "D"));
    }

    @Test
    public void testWithoutTransformations() {
        Collection<String> res = transformations.getPossibleTargetTypes("a");
        assertEquals(1, res.size());

        TransformationPath path = transformations.getPath("A", "A");
        assertNotNull(path);
        assertEquals(0, path.size());

        assertNull(transformations.getPath("B", "C"));
    }
}