/*
    * Copyright 2012 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.openehealth.ipf.commons.ihe.core.chain;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import static org.junit.Assert.assertEquals;
  
  /**
   * @author Dmytro Rud
   */
  public class ChainUtilsTest {
      private static final List<Chainable> INITIAL = new ArrayList<>();
  
  
      @BeforeClass
      public static void setUpClass() {
          for (int i = 1; i <= 7; ++i) {
              INITIAL.add(new MyChainable("i" + i, "", ""));
          }
      }
  
  
      private static void doTest(List<Chainable> custom, String expected) {
          List<Chainable> chain = ChainUtils.createChain(INITIAL, custom);
          StringBuilder sb = new StringBuilder();
          for (Chainable c : chain) {
              sb.append(c.getId()).append(" ");
          }
          assertEquals(expected, sb.toString().trim());
      }
  
  
      @Test
      public void testHappyCase() {
          List<Chainable> custom = Arrays.asList(
                  new MyChainable("c1", "", ""),
                  new MyChainable("c1", "", ""),
                  new MyChainable("c2", "i5 i6 i7", "i3"),
                  new MyChainable("c4", "c2", "")
          );
          doTest(custom, "i1 i2 i3 c4 c2 i4 i5 i6 i7 c1");
      }
  
      @Test
      public void testAlreadyExistent() {
          List<Chainable> custom = Arrays.asList(
                  new MyChainable("i1", "", ""),
                  new MyChainable("i2", "", ""),
                  new MyChainable("i3", "i5 i6 i7", "i3"),
                  new MyChainable("i4", "", "")
          );
          doTest(custom, "i1 i2 i3 i4 i5 i6 i7");
      }
  
  
      @Test(expected = ChainException.class)
      public void testBeforeEqualsToAfter() {
          List<Chainable> custom = Arrays.asList(
                  new MyChainable("c1", "", ""),
                  new MyChainable("c1", "", ""),
                  new MyChainable("c2", "i5 i6 i7", "i3"),
                  new MyChainable("c4", "c2", ""),
                  new MyChainable("c5", "i4", "i4")        // should fail, Before==After
          );
          doTest(custom, "dummy");
      }                                               
  
  
      @Test(expected = ChainException.class)
      public void testBeforeGreaterThanAfter() {
          List<Chainable> custom = Arrays.asList(
                  new MyChainable("c1", "", ""),
                  new MyChainable("c1", "", ""),
                  new MyChainable("c2", "i5 i6 i7", "i3"),
                  new MyChainable("c4", "c2", ""),
                  new MyChainable("c5", "i3", "i4")        // should fail, Before>After
          );
          doTest(custom, "dummy");
      }
  
 
     @Test(expected = ChainException.class)
     public void testDependencyLoop() {
         List<Chainable> custom = Arrays.asList(
                 new MyChainable("c1", "c2", "c3"),
                 new MyChainable("c2", "c1", "c3"),
                 new MyChainable("c3", "c1", "c2")
         );
         doTest(custom, "dummy");
     }
 
 }