/*
    * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH
    *
    * 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 de.smartics.properties.spi.config.resolve;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.is;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import de.smartics.properties.api.config.domain.UnknownPropertyException;
  import de.smartics.testdoc.annotations.Uut;
  
  /**
   * Tests {@link Resolver}.
   */
  public class ResolverTest
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * Test value.
     */
    private static final String VALUE_1 = "v1";
  
    // --- members --------------------------------------------------------------
  
    @Uut
    private Resolver uut;
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- prepare --------------------------------------------------------------
  
    @Before
    public void setUp()
    {
      final ResolveContext context = mock(ResolveContext.class);
      when(context.get("component.name1")).thenReturn(VALUE_1);
      when(context.get("component.name2")).thenReturn("X${component.name1}");
      when(context.get("illegal.recursion")).thenReturn("${illegal.recursion}");
      when(context.get("illegal.recursion1")).thenReturn("${illegal.recursion2}");
      when(context.get("illegal.recursion2")).thenReturn("${illegal.recursion1}");
      when(context.get("illegal.unknown")).thenReturn("${unknown}");
      when(context.get("illegal.null")).thenReturn("${null}");
      when(context.get("illegal.unknownInDepth"))
          .thenReturn("${illegal.unknown}");
      when(context.get("unknown")).thenThrow(
          new UnknownPropertyException(null, "unknown"));
      when(context.get("null")).thenReturn(null);
  
      uut = new Resolver(context);
    }
  
    // --- helper ---------------------------------------------------------------
  
    // --- tests ----------------------------------------------------------------
  
    @Test
    public void resolvesValueWithoutPlaceholders()
    {
      final String expression = "test";
      final String resolved = uut.resolve(expression);
      assertThat(resolved, is(equalTo(expression)));
    }
  
    @Test(expected = UnknownPropertyException.class)
    public void resolvesWithUnknownPlaceholder()
    {
      final String expression = "${unknown}";
      final String resolved = uut.resolve(expression);
      assertThat(resolved, is(equalTo(VALUE_1)));
    }
  
    @Test
    public void resolvesValueWithOnePlaceholder()
    {
      final String expression = "${component.name1}";
      final String resolved = uut.resolve(expression);
     assertThat(resolved, is(equalTo(VALUE_1)));
   }
 
   @Test
   public void resolvesValueWithMultiplePlaceholders()
   {
     final String expression = "$${component.name1} ${component.name1}${";
     final String resolved = uut.resolve(expression);
     assertThat(resolved, is(equalTo('$' + VALUE_1 + ' ' + VALUE_1 + "${")));
   }
 
   @Test
   public void resolvesRecursively()
   {
     final String expression = "${component.name2}";
     final String resolved = uut.resolve(expression);
     assertThat(resolved, is(equalTo('X' + VALUE_1)));
   }
 
   @Test(expected = RecursivePropertyException.class)
   public void detectsDirectInfiniteRecursions()
   {
     final String expression = "${illegal.recursion}";
     uut.resolve(expression);
   }
 
   @Test(expected = RecursivePropertyException.class)
   public void detectsInfiniteRecursions()
   {
     final String expression = "${illegal.recursion1}";
     uut.resolve(expression);
   }
 
   @Test(expected = UnknownPropertyException.class)
   public void detectsReferencesToUnknownPlaceholder()
   {
     final String expression = "${illegal.unknown}";
     uut.resolve(expression);
   }
 
   @Test(expected = UnknownPropertyException.class)
   public void detectsReferencesToUnknownPlaceholderInDepth()
   {
     final String expression = "${illegal.unknownInDepth}";
     uut.resolve(expression);
   }
 
   @Test(expected = UnresolvablePropertyException.class)
   public void detectsReferencedNullValue()
   {
     final String expression = "${illegal.null}";
     uut.resolve(expression);
   }
 }