/*

 * The contents of this file are subject to the terms of the Common Development

 * and Distribution License (the License). You may not use this file except in

 * compliance with the License.

 *

 * You can obtain a copy of the License at http://www.netbeans.org/cddl.html

 * or http://www.netbeans.org/cddl.txt.

 *

 * When distributing Covered Code, include this CDDL Header Notice in each file

 * and include the License file at http://www.netbeans.org/cddl.txt.

 * If applicable, add the following below the CDDL Header, with the fields

 * enclosed by brackets [] replaced by your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun

 * Microsystems, Inc. All Rights Reserved.

 */

package org.netbeans.apifest.boolcircuit;

import java.security.CodeSource;

import java.security.Permission;

import java.security.PermissionCollection;

import java.security.Policy;

import java.util.Collection;

import java.util.Collections;

import java.util.Enumeration;

import junit.framework.TestCase;

import junit.framework.*;

/** This file contains the APIFest quest for day 2. Simply, turn the 

 * boolean circuit into circuit that can compute with double values from 0 to 1.

 * <p>

 * This means that where ever a boolean was used to represent input or 

 * output values, one can now use any double number from >= 0 and <= 1.

 * Still, to support backward compatibility, the operations with booleans

 * has to be kept available and have to work. In fact False shall be 

 * treated as 0 and True as 1.

 * <p>

 * The basic elements has to be modified to work on doubles in the following

 * way:

 * <ul>

 *   <li>negation - neg(x) = 1 - x, this is correct extension as neg(false)=neg(0)=1-0=1=true

 *   <li>and - and(x,y) = x * y, again this is fine as and(true,true)=1*1=true and also

 *             and(false,true)=0*1=0=false

 *   <li>or - or(x,y) = 1 - (1 - x) * (1 - y) and this is also ok as

 *             or(false,false) = 1 - (1 - 0) * (1 - 0) = 1 - 1 = 0 = false

 *             or(true,false) = 1 - (1 - 1) * (1 - 0) = 1 - 0 * 1 = 1 = true

 * </ul>

 * <p>

 * However as the circuits with doubles are more rich than plain boolean circuits,

 * there is additional requirement to allow any user of your API to write its 

 * own "element" type. This is all going to be exercise in the tests bellow

 * which you are supposed to implement.

 */

public class RealTest extends TestCase {

    static {

        // your code shall run without any permissions

    }

    public RealTest(String testName) {

        super(testName);

    }

    protected void setUp() throws Exception {

    }

    protected void tearDown() throws Exception {

    }

    /** First of all create a circuit which will evaluate

     * expression (X1 and X2) or not(x1). Hold the circuit

     * in some variable.

     *

     * Feed this circuit with x1=true, x2=false, assert result is false

     *

     * Feed the same circuit with x1=false, x2=true, assert result is true

     *

     * Feed the same circuit with x1=0.0, x2=1.0, assert result is 1.0

     *

     * Feed the same circuit with x1=0.5, x2=0.5, assert result is 0.625

     *

     * Feed the same circuit with x1=0.0, x2=2.0, make sure it throws an exception

     */

    public void testX1andX2orNotX1() {

        VariableInput x1 = Factory.createVariableInput();

        VariableInput x2 = Factory.createVariableInput();

        Operation and = Factory.createAndOperation(x1, x2);

        Operation not = Factory.createNotOperation(x1);

        Operation or = Factory.createOrOperation(Factory.createOperationBasedInput(and), Factory.createOperationBasedInput(not));

        x1.setBooleanValue(false);

        x2.setBooleanValue(true);

        assertTrue(Circuit.evaluateBooleanOperation(or));

        x1.setRealValue(0.0);

        x2.setRealValue(1.0);

        assertEquals(1.0, Circuit.evaluateRealOperation(or));

        x1.setRealValue(0.5);

        x2.setRealValue(0.5);

        assertEquals(0.625, Circuit.evaluateRealOperation(or));

        try {

            x1.setRealValue(0.0);

            x2.setRealValue(2.0);

            Circuit.evaluateRealOperation(or);

            fail();

        } catch (IllegalArgumentException exc) {

            //good..

        }

    }

    /** Ensure that one variable cannot be filled with two different values.

     * Create a circuit for x1 and x1. Make sure that for any usage of your

     * API that would not lead to x1 * x1 result, an exception is thrown.

     * For example if there was a way to feed the circuit with two different 

     * values 0.3 and 0.5 an exception is thrown indicating that this is 

     * improper use of the circuit.

     */

    public void testImproperUseOfTheCircuit() {

        // this is enforced by the setter on the VariableInput.. how to test??

//        fail("task2");

        // PS: This request is based on observation that some API from day1

        // solved the multiple usage of one variable, by repeating its 

        // value multiple times. This tasks says that if this is case of

        // your API you must make sure, when that usage of different values

        // for one variable is prohibited. If there is no way in your API to

        // express this task, just say so, and you do not need to write a test.

        // However if anyone else finds a way to simulate such situation in your

        // API later, it will get points for breaking your API.

    }

    /** Write your own element type called "gte" that will have two inputs and one output.

     * The output value will be 1 if x1 >= x2 and 0 otherwise. 

     * 

     * Create 

     * circuit for following expression: (x1 and not(x1)) gte x1

     *

     * Feed the circuit with 0.5 and verify the result is 0

     *

     * Feed the same circuit with 1 and verify the result is 0

     *

     * Feed the same circuit with 0 and verify the result is 1

     */

    public void testGreaterThanEqualElement() {

        VariableInput x1 = Factory.createVariableInput();

        Operation not = Factory.createNotOperation(x1);

        Operation and = Factory.createAndOperation(x1, Factory.createOperationBasedInput(not));

        Operation gte = new GTEOperation(Factory.createOperationBasedInput(and), x1);

        x1.setRealValue(0.5);

        assertEquals(0.0, Circuit.evaluateRealOperation(gte));

        x1.setRealValue(1.0);

        assertEquals(0.0, Circuit.evaluateRealOperation(gte));

        x1.setRealValue(0.0);

        assertEquals(1.0, Circuit.evaluateRealOperation(gte));

    }

    private final class GTEOperation extends Operation {

        private Input input2;

        private Input input1;

        public GTEOperation(Input in1, Input in2) {

            super();

            input1 = in1;

            input2 = in2;

        }

        public boolean performBooleanOperation() {

            return input1.getRealValue() >= input2.getRealValue();

        }

        public double performRealOperation() {

            return (input1.getRealValue() >= input2.getRealValue()) ? 1.0 : 0.0;

        }

    }

}