/*
    * 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.commons.scxml2.model;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.fail;
  
  import java.io.StringReader;
  
  import org.apache.commons.scxml2.SCXMLExecutor;
  import org.apache.commons.scxml2.SCXMLTestHelper;
  import org.junit.Test;
  
  public class ScxmlInitialAttributeTest {
  
      private static final String SCXML_WITH_LEGAL_INITIAL =
              "<scxml xmlns=\"http://www.w3.org/2005/07/scxml\" version=\"1.0\" initial=\"s1\">\n" +
              "  <state id=\"s1\">\n" +
              "    <transition event=\"end\" target=\"fine\" />\n" +
              "  </state>\n" +
              "  <final id=\"fine\"/>\n" +
              "</scxml>";
  
      private static final String SCXML_WITH_NO_INITIAL =
              "<scxml xmlns=\"http://www.w3.org/2005/07/scxml\" version=\"1.0\">\n" +
              "  <state id=\"s1\">\n" +
              "    <transition event=\"end\" target=\"fine\" />\n" +
              "  </state>\n" +
              "  <final id=\"fine\"/>\n" +
              "</scxml>";
  
      private static final String SCXML_WITH_ILLEGAL_INITIAL =
              "<scxml xmlns=\"http://www.w3.org/2005/07/scxml\" version=\"1.0\" initial=\"nonexisting\">\n" +
              "  <state id=\"s1\">\n" +
              "    <transition event=\"end\" target=\"fine\" />\n" +
              "  </state>\n" +
              "  <final id=\"fine\"/>\n" +
              "</scxml>";
  
      @Test
      public void testInitial() throws Exception {
          SCXML scxml = SCXMLTestHelper.parse(new StringReader(SCXML_WITH_LEGAL_INITIAL), null);
          assertEquals("The initial state ID reading was wrong.", "s1", scxml.getInitial());
          TransitionTarget tt = scxml.getInitialTransition().getTargets().iterator().next();
          assertEquals("The initial state resolution was wrong.", "s1", tt.getId());
          SCXMLExecutor exec = SCXMLTestHelper.getExecutor(scxml);
          exec.go();
          assertEquals(scxml.getTargets().get("s1"), exec.getStatus().getStates().iterator().next());
      }
  
      @Test
      public void testNoInitial() throws Exception {
          SCXML scxml = SCXMLTestHelper.parse(new StringReader(SCXML_WITH_NO_INITIAL), null);
          assertNull(scxml.getInitial());
          TransitionTarget tt = scxml.getInitialTransition().getTargets().iterator().next();
          assertEquals("The initial state resolution was wrong.", "s1", tt.getId());
          SCXMLExecutor exec = SCXMLTestHelper.getExecutor(scxml);
          exec.go();
          assertEquals(scxml.getTargets().get("s1"), exec.getStatus().getStates().iterator().next());
      }
  
      @Test
      public void testIllegalInitial() throws Exception {
          try {
              SCXMLTestHelper.parse(new StringReader(SCXML_WITH_ILLEGAL_INITIAL), null);
              fail("SCXML reading should have failed due to the illegal state ID in SCXML.");
          } catch (ModelException e) {
              // expected because of the non-existing initial state id
          }
      }
  }