/*
 * $Id$
 */

package edu.jas.poly;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import edu.jas.arith.BigRational;


/**
 * BigRational coefficients GenPolynomial coefficients GenPolynomial tests with JUnit.
 * @author Heinz Kredel
 */

public class RatPolyGenPolynomialTest extends TestCase {

    /**
     * main
     */
    public static void main (String[] args) {
        junit.textui.TestRunner.run( suite() );
    }

    /**
     * Constructs a <CODE>RatPolyGenPolynomialTest</CODE> object.
     * @param name String.
     */
    public RatPolyGenPolynomialTest(String name) {
        super(name);
    }

    /**
     */ 
    public static Test suite() {
        TestSuite suite= new TestSuite(RatPolyGenPolynomialTest.class);
        return suite;
    }

    GenPolynomialRing<BigRational> cf;
    GenPolynomialRing<GenPolynomial<BigRational>> fac;

    GenPolynomial<GenPolynomial<BigRational>> a, b, c, d, e;

    int rl = 7; 
    int kl = 10;
    int ll = 10;
    int el = 5;
    float q = 0.5f;

    protected void setUp() {
        a = b = c = d = e = null;
        cf  = new GenPolynomialRing<BigRational>( new BigRational(1), 1 );
        fac = new GenPolynomialRing<GenPolynomial<BigRational>>(cf,rl);
    }

    
    protected void tearDown() {
        a = b = c = d = e = null;
        fac = null;
    }


    /**
     * Test constructor and toString.
     */
    public void testConstruction() {
        c = fac.getONE();
        assertTrue("length( c ) = 1", c.length() == 1);
        assertTrue("isZERO( c )", !c.isZERO() );
        assertTrue("isONE( c )", c.isONE() );

        d = fac.getZERO();
        assertTrue("length( d ) = 0", d.length() == 0);
        assertTrue("isZERO( d )", d.isZERO() );
        assertTrue("isONE( d )", !d.isONE() );
    }


    /**
     * Test random polynomial.
     */
    public void testRandom() {
        for (int i = 0; i < 7; i++) {
            a = fac.random(ll);
            //fac.random(kl*(i+1), ll+2*i, el+i, q );
            assertTrue("length( a"+i+" ) <> 0", a.length() >= 0);
            assertTrue(" not isZERO( a"+i+" )", !a.isZERO() );
            assertTrue(" not isONE( a"+i+" )", !a.isONE() );
        }
    }


    /**
     * Test addition.
     */
    public void testAddition() {
        a = fac.random(ll);
        b = fac.random(ll);

        c = a.sum(b);
        d = c.subtract(b);
        assertEquals("a+b-b = a",a,d);

        c = fac.random(ll);

        ExpVector u = ExpVector.random(rl,el,q);
        GenPolynomial<BigRational> x = cf.random(kl);

        b = new GenPolynomial<GenPolynomial<BigRational>>(fac,x, u);
        c = a.sum(b);
        d = a.sum(x,u);
        assertEquals("a+p(x,u) = a+(x,u)",c,d);

        c = a.subtract(b);
        d = a.subtract(x,u);
        assertEquals("a-p(x,u) = a-(x,u)",c,d);

        a = new GenPolynomial<GenPolynomial<BigRational>>(fac);
        b = new GenPolynomial<GenPolynomial<BigRational>>(fac,x, u);
        c = b.sum(a);
        d = a.sum(x,u);
        assertEquals("a+p(x,u) = a+(x,u)",c,d);

        c = a.subtract(b);
        d = a.subtract(x,u);
        assertEquals("a-p(x,u) = a-(x,u)",c,d);
    }


    /**
     * Test object multiplication.
     */
    public void testMultiplication() {
        a = fac.random(ll);
        assertTrue("not isZERO( a )", !a.isZERO() );

        b = fac.random(ll);
        assertTrue("not isZERO( b )", !b.isZERO() );

        c = b.multiply(a);
        d = a.multiply(b);
        assertTrue("not isZERO( c )", !c.isZERO() );
        assertTrue("not isZERO( d )", !d.isZERO() );

        //System.out.println("a = " + a);
        //System.out.println("b = " + b);
        e = d.subtract(c);
        assertTrue("isZERO( a*b-b*a ) " + e, e.isZERO() );

        assertTrue("a*b = b*a", c.equals(d) );
        assertEquals("a*b = b*a",c,d);

        c = fac.random(ll);
        //System.out.println("c = " + c);
        d = a.multiply( b.multiply(c) );
        e = (a.multiply(b)).multiply(c);

        //System.out.println("d = " + d);
        //System.out.println("e = " + e);

        //System.out.println("d-e = " + d.subtract(c) );

        assertEquals("a(bc) = (ab)c",d,e);
        assertTrue("a(bc) = (ab)c", d.equals(e) );

        //GenPolynomial<BigRational> x = a.leadingBaseCoefficient().inverse();
        //c = a.monic();
        //d = a.multiply(x);
        //assertEquals("a.monic() = a(1/ldcf(a))",c,d);

        GenPolynomial<BigRational> y = b.leadingBaseCoefficient();
        //c = b.monic();
        //d = b.multiply(y);
        //assertEquals("b.monic() = b(1/ldcf(b))",c,d);

        e = new GenPolynomial<GenPolynomial<BigRational>>(fac,y);
        c = b.multiply(e);
        // assertEquals("b.monic() = b(1/ldcf(b))",c,d);

        d = e.multiply(b);
        assertEquals("b*p(y,u) = p(y,u)*b",c,d);
    }

}
