/**
    * Copyright 2005-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.krms.framework;
  
  import static junit.framework.Assert.assertFalse;
  import static junit.framework.Assert.assertNotNull;
  import static junit.framework.Assert.assertTrue;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.kuali.rice.krms.api.engine.EngineResults;
  import org.kuali.rice.krms.api.engine.ExecutionOptions;
  import org.kuali.rice.krms.api.engine.ExecutionFlag;
  import org.kuali.rice.krms.api.engine.Facts;
  import org.kuali.rice.krms.api.engine.SelectionCriteria;
  import org.kuali.rice.krms.api.engine.Term;
  import org.kuali.rice.krms.api.engine.TermResolver;
  import org.kuali.rice.krms.api.repository.agenda.AgendaDefinition;
  import org.kuali.rice.krms.framework.engine.Action;
  import org.kuali.rice.krms.framework.engine.Agenda;
  import org.kuali.rice.krms.framework.engine.BasicAgenda;
  import org.kuali.rice.krms.framework.engine.BasicAgendaTree;
  import org.kuali.rice.krms.framework.engine.BasicAgendaTreeEntry;
  import org.kuali.rice.krms.framework.engine.BasicContext;
  import org.kuali.rice.krms.framework.engine.BasicRule;
  import org.kuali.rice.krms.framework.engine.CollectionOfComparablesTermBasedProposition;
  import org.kuali.rice.krms.framework.engine.CollectionOperator;
  import org.kuali.rice.krms.framework.engine.Context;
  import org.kuali.rice.krms.framework.engine.ContextProvider;
  import org.kuali.rice.krms.framework.engine.Proposition;
  import org.kuali.rice.krms.framework.engine.ProviderBasedEngine;
  import org.kuali.rice.krms.framework.engine.ResultLogger;
  import org.kuali.rice.krms.framework.engine.Rule;
  import org.kuali.rice.krms.framework.engine.expression.ComparisonOperator;
  import org.kuali.rice.krms.framework.engine.expression.ComparisonOperatorServiceImpl;
  
  public class CollectionOfComparablesTermBasedPropositionTest {
  	private static final ResultLogger LOG = ResultLogger.getInstance();
  	
      private ComparisonOperator operatorGreaterThan;
  
  	@Before
  	public void setUp() {
          operatorGreaterThan = ComparisonOperator.GREATER_THAN;
          operatorGreaterThan.setComparisonOperatorService(ComparisonOperatorServiceImpl.getInstance());
  
  		ActionMock.resetActionsFired();
  	}
  
  	@Test
  	public void allPropositionTest() {
  
  		// True cases:
  		
  		// this can be read as "for the collection (100, 1000), all elements are greater than 1"
  		assertRuleTrue(Arrays.asList(100f, 1000f), CollectionOperator.ALL, operatorGreaterThan, 1f);
  		
  		assertRuleTrue(Arrays.asList(100f), CollectionOperator.ALL, operatorGreaterThan, 1f);
  		// This can bend the intuition a bit, but this behavior is correct -- see Wikipedia's entry on the empty set
  		assertRuleTrue(Arrays.<Float>asList(), CollectionOperator.ALL, operatorGreaterThan, 1f);
  		
  		// False cases:
  		assertRuleFalse(Arrays.asList(100f, 1000f), CollectionOperator.ALL, operatorGreaterThan, 10000f);
  		assertRuleFalse(Arrays.asList(100f, 1000f), CollectionOperator.ALL, operatorGreaterThan, 500f);
  		assertRuleFalse(Arrays.asList(1000f, 100f), CollectionOperator.ALL, operatorGreaterThan, 500f);
  		assertRuleFalse(Arrays.asList(100f), CollectionOperator.ALL, operatorGreaterThan, 10000f);
  
  	}
  	
  	@Test
  	public void oneOrMorePropositionTest() {
  
  		// True cases:
  		
  		// this can be read as "for the collection (100, 1000), one or more elements are greater than 500"
  		assertRuleTrue(Arrays.asList(100f, 1000f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 500f);
  		assertRuleTrue(Arrays.asList(1000f, 100f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 500f);
  		assertRuleTrue(Arrays.asList(1000f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 500f);
  
 		// False cases:
 		assertRuleFalse(Arrays.asList(1000f, 2000f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 5000f);
 		assertRuleFalse(Arrays.asList(2000f, 1000f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 5000f);
 		assertRuleFalse(Arrays.asList(1000f), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 5000f);
 		assertRuleFalse(Arrays.<Float>asList(), CollectionOperator.ONE_OR_MORE, operatorGreaterThan, 5000f);
 
 	}
 	
 	@Test
 	public void nonePropositionTest() {
 		
 		// True cases:
 		
 		// this can be read as "for the collection (100, 1000), none of the elements are greater than 5000"
 		assertRuleTrue(Arrays.asList(100f, 1000f), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 		assertRuleTrue(Arrays.asList(1000f), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 		assertRuleTrue(Arrays.<Float>asList(), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 		
 		// False cases:
 		assertRuleFalse(Arrays.asList(1000f, 7000f), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 		assertRuleFalse(Arrays.asList(7000f, 1000f), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 		assertRuleFalse(Arrays.asList(7000f), CollectionOperator.NONE, operatorGreaterThan, 5000f);
 
 	}
 	
 	/**
 	 * @param agenda
 	 */
 	private void execute(Agenda agenda, TermResolver ... termResolvers) {
 		Map<String, String> contextQualifiers = new HashMap<String, String>();
 		contextQualifiers.put("docTypeName", "Proposal");
 
 		List<TermResolver<?>> testResolvers = Arrays.<TermResolver<?>>asList(termResolvers);
 		
 		Context context = new BasicContext(Arrays.asList(agenda), testResolvers);
 		ContextProvider contextProvider = new ManualContextProvider(context);
 		
 		SelectionCriteria selectionCriteria = SelectionCriteria.createCriteria(null, contextQualifiers,
                 Collections.singletonMap(AgendaDefinition.Constants.EVENT, "test"));
 		
 		ProviderBasedEngine engine = new ProviderBasedEngine();
 		engine.setContextProvider(contextProvider);
 
 		// Set execution options to log execution
 		ExecutionOptions executionOptions = new ExecutionOptions().setFlag(ExecutionFlag.LOG_EXECUTION, true);
 		
 		EngineResults results = engine.execute(selectionCriteria, Facts.EMPTY_FACTS, executionOptions);
 		assertNotNull(results);
 	}
 	
 	private void assertRuleTrue(List<Float> termValue,
 			CollectionOperator collectionOper,
 			ComparisonOperator comparisonOper, Float compareValue) {
 		assertRule(termValue, collectionOper, comparisonOper, compareValue, true);
 	}
 	
 	private void assertRuleFalse(List<Float> termValue,
 			CollectionOperator collectionOper,
 			ComparisonOperator comparisonOper, Float compareValue) {
 		assertRule(termValue, collectionOper, comparisonOper, compareValue, false);
 	}
 	
 	private void assertRule(List<Float> termValue,
 			CollectionOperator collectionOper,
 			ComparisonOperator comparisonOper, Float compareValue, boolean assertTrue) {
 		
 		boolean actionFired = executeTestAgenda(termValue, collectionOper, comparisonOper, compareValue).actionFired();
 		
 		if (assertTrue) { 
 			assertTrue(actionFired); 
 		} else { 
 			assertFalse(actionFired); 
 		}
 		
 		ActionMock.resetActionsFired();
 	}
 
 	/**
 	 * This method ...
 	 * 
 	 * @param termValue
 	 * @param collectionOper
 	 * @param comparisonOper
 	 * @param compareValue
 	 * @return
 	 */
 	private ActionMock executeTestAgenda(List<Float> termValue,
 			CollectionOperator collectionOper,
 			ComparisonOperator comparisonOper, Float compareValue) {
 		Term expensesTerm = new Term("expenses");
 		TermResolver<Collection<Float>> expensesResolver = new TermResolverMock<Collection<Float>>(expensesTerm.getName(), termValue);
 		
 		Proposition prop1 = new CollectionOfComparablesTermBasedProposition(collectionOper, comparisonOper, expensesTerm, compareValue);
 		ActionMock prop1Action = new ActionMock("prop1Action");
 		
 		Rule rule = new BasicRule("ALL", prop1, Collections.<Action>singletonList(prop1Action));
 		
 		BasicAgendaTree agendaTree = new BasicAgendaTree(new BasicAgendaTreeEntry(rule)); 
 		Agenda agenda = new BasicAgenda(Collections.singletonMap(AgendaDefinition.Constants.EVENT, "test"), agendaTree);
 		
 		execute(agenda, expensesResolver);
 		return prop1Action;
 	}
 
 }