package org.netbeans.apifest.boolcircuit;

import junit.framework.TestCase;

import junit.framework.*;

import org.netbeans.apifest.custom.Gte;

/** 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

 *   <li>and - and(x,y) = x * y

 *   <li>or - or(x,y) = 1 - (1 - x) * (1 - y)

 * </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.

 */

// BEGIN: apifest.day2.welltestedsolution.RealTest

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() {

        Circuit c = Circuit.createOrCircuit(

            Circuit.createAndCircuit(Circuit.input(0), 

            Circuit.input(1)),

            Circuit.createNotCircuit(Circuit.input(0))

        );

        assertFalse("true, false", c.evaluate(true, false));

        assertTrue("false, true", c.evaluate(false, true));

        assertEquals("0.0, 1.0", 1.0, c.evaluateFuzzy(0.0, 1.0), 0.0);

    }

    /** 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() {

        // does not apply

        Circuit x1 = Circuit.input(0);

        Circuit c = Circuit.createOrCircuit(x1, x1);

        assertTrue("x1 or x1", c.evaluate(true));

        assertFalse("x1 or x1", c.evaluate(false));

        try {

            c.evaluate();

            fail("x1 or x1 with wrong params");

        } catch (IllegalArgumentException iea) {

            //expected

        }

        // the same with two instances of pin

        c = Circuit.createOrCircuit(Circuit.input(0), Circuit.input(0));

        assertTrue("x1 or x1", c.evaluate(true));

        assertTrue("x1 or x1", c.evaluate(true, false));

        assertTrue("x1 or x1", c.evaluate(true, true));

        assertFalse("x1 or x1", c.evaluate(false));

        try {

            c.evaluate();

            fail("x1 or x1 with wrong params");

        } catch (IllegalArgumentException iea) {

            //expected

        }

    }

    /** 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() {

        Circuit gte = new Gte(Circuit.createAndCircuit(

            Circuit.input(0),

            Circuit.createNotCircuit(Circuit.input(0))),

            Circuit.input(0)

        );

        assertEquals("0.5", 0.0, gte.evaluateFuzzy(0.5), 0.0);

        assertEquals("1.0", 0.0, gte.evaluateFuzzy(1.0), 0.0);

        assertEquals("0.0", 1.0, gte.evaluateFuzzy(0.0), 0.0);

    }

    public void testSilly() {

        // (x1 and not x2) or x3

        Circuit c = Circuit.createOrCircuit(

            Circuit.createAndCircuit(

            null,

            Circuit.createNotCircuit(null)),

            null

        );

        assertEquals("1 1 1", 1.0, c.evaluateFuzzy(1.0, 1.0, 1.0), 0.0);

        assertEquals("1 1 0", 0.0, c.evaluateFuzzy(1.0, 1.0, 0.0), 0.0);

        assertEquals("1 0 1", 1.0, c.evaluateFuzzy(1.0, 0.0, 1.0), 0.0);

        assertEquals("1 0 0", 1.0, c.evaluateFuzzy(1.0, 0.0, 0.0), 0.0);

        assertEquals("0 1 1", 1.0, c.evaluateFuzzy(0.0, 1.0, 1.0), 0.0);

        assertEquals("0 1 0", 0.0, c.evaluateFuzzy(0.0, 1.0, 0.0), 0.0);

        assertEquals("0 0 1", 1.0, c.evaluateFuzzy(0.0, 0.0, 1.0), 0.0);

        assertEquals("0 0 0", 0.0, c.evaluateFuzzy(0.0, 0.0, 0.0), 0.0);

    }

}

// END: apifest.day2.welltestedsolution.RealTest