/*
    TestRational.java
    David Klick
    CIS 260
    2018-01-20
    
    Test program for Rational number assignment.
*/

public class TestRational {
    public static void main(String[] args) {
        int errors = 0;
        Rational[] r = { new Rational(),
            new Rational(12,15),
            new Rational(-15,-12),
            new Rational(2, 3)
        };

        if (r[3].getNumerator() != 2) {
            System.out.printf("Rational(2, 3) or getNumerator() not working properly: %s%n", r[3].toString());
            errors++;
        }

        if (r[3].getDenominator() != 3) {
            System.out.printf("Rational(2, 3) or getDenominator() not working properly: %s%n", r[3].toString());
            errors++;
        }

        if (r[0].getNumerator() != 1 || r[0].getDenominator() != 1) {
            System.out.printf("Rational() not working properly: %s%n", r[0].toString());
            errors++;
        }

        if (r[0].getNumerator() != 1 || r[0].getDenominator() != 1) {
            System.out.printf("Rational() not working properly: %s%n", r[0].toString());
            errors++;
        }

        if (r[1].getNumerator() != 4 || r[1].getDenominator() != 5) {
            System.out.printf("Rational(12, 15) not working properly: %s%n", r[1].toString());
            errors++;
        }

        if (r[2].getNumerator() != 5 || r[2].getDenominator() != 4) {
            System.out.printf("Rational(-15, -12) not working properly: %s%n", r[2].toString());
            errors++;
        }

        r[0].setNums(210, 490);
        if (r[0].getNumerator() != 3 || r[0].getDenominator() != 7) {
            System.out.printf("setnums(210, 490) not working properly: %s%n", r[0].toString());
            errors++;
        }

        r[0].setNums(0, 20);
        if (r[0].getNumerator() != 0 || r[0].getDenominator() != 1) {
            System.out.printf("setnums(0, 20) not working properly: %s%n", r[0].toString());
            errors++;
        }

        r[0].setNums(-17, -13);
        if (r[0].getNumerator() != 17 || r[0].getDenominator() != 13) {
            System.out.printf("setnums(-17, -13) not working properly: %s%n", r[0].toString());
            errors++;
        }

        try {
            r[0].setNums(5, 0);
            System.out.printf("setnums(5, 0) not throwing exception: %s%n", r[0].toString());
            errors++;
        } catch (IllegalArgumentException e) {
            String errmsg = "Invalid rational number: 5/0";
            if (!e.getMessage().equals(errmsg)) {
                System.out.printf("setnums(5, 0) exception message does not match%n");
                System.out.printf("    expected: %s%n", errmsg);
                System.out.printf("         got: %s%n", e.getMessage());
                errors++;
            }
        }

        if (Rational.getDisplayStyle() != Rational.DisplayStyle.FRACTIONAL) {
            System.out.printf("Display style not initialized correctly%n");
            errors++;
        }

        Rational.setDisplayStyle(Rational.DisplayStyle.FRACTIONAL);
        if (Rational.getDisplayStyle() != Rational.DisplayStyle.FRACTIONAL) {
            System.out.printf("setDisplayStyle(FRACTIONAL) not working properly%n");
            errors++;
        }

        Rational.setDisplayStyle(Rational.DisplayStyle.FLOATING_POINT);
        if (Rational.getDisplayStyle() != Rational.DisplayStyle.FLOATING_POINT) {
            System.out.printf("setDisplayStyle(FLOATING_POINT) not working properly%n");
            errors++;
        }

        r[0].setNums(1, 8);
        if (!r[0].toString().startsWith("0.125")) {
            System.out.printf("(new Rational(1, 8)).toString() FLOATING_POINT display not working properly%s%n", r[0].toString());
            errors++;
        }
        
        Rational.setDisplayStyle(Rational.DisplayStyle.FRACTIONAL);
        if (!r[0].toString().equals("1/8")) {
            System.out.printf("(new Rational(1, 8)).toString() FRACTIONAL display not working properly%s%n", r[0].toString());
            errors++;
        }

        r[0].setNums(1, 2);
        r[1].setNums(1, 3);
        r[2] = r[0].add(r[1]);
        if (r[0].getNumerator() != 1 || r[0].getDenominator() != 2 || r[1].getNumerator() != 1
            || r[1].getDenominator() != 3 || r[2].getNumerator() != 5 || r[2].getDenominator() != 6) {
            System.out.printf("add(Rational) not working properly: %s + %s => %s%n", r[0].toString(), r[1].toString(), r[2].toString());
            errors++;
        }

        r[0].setNums(1, 2);
        r[1].setNums(2, 3);
        r[2] = r[0].subtract(r[1]);
        if (r[0].getNumerator() != 1 || r[0].getDenominator() != 2 || r[1].getNumerator() != 2
            || r[1].getDenominator() != 3 || r[2].getNumerator() != -1 || r[2].getDenominator() != 6) {
            System.out.printf("subtract(Rational) not working properly: %s - %s => %s%n", r[0].toString(), r[1].toString(), r[2].toString());
            errors++;
        }

        r[0].setNums(1, 2);
        r[1].setNums(2, 3);
        r[2] = r[0].multiply(r[1]);
        if (r[0].getNumerator() != 1 || r[0].getDenominator() != 2 || r[1].getNumerator() != 2
            || r[1].getDenominator() != 3 || r[2].getNumerator() != 1 || r[2].getDenominator() != 3) {
            System.out.printf("multiply(Rational) not working properly: %s * %s => %s%n", r[0].toString(), r[1].toString(), r[2].toString());
            errors++;
        }

        r[0].setNums(2, 3);
        r[1].setNums(7, 33);
        r[2] = r[0].divide(r[1]);
        if (r[0].getNumerator() != 2 || r[0].getDenominator() != 3 || r[1].getNumerator() != 7
            || r[1].getDenominator() != 33 || r[2].getNumerator() != 22 || r[2].getDenominator() != 7) {
            System.out.printf("divide(Rational) not working properly: %s / %s => %s%n", r[0].toString(), r[1].toString(), r[2].toString());
            errors++;
        }

        r[0].setNums(7, 8);
        r[1] = r[0].increment();
        if (r[0].getNumerator() != 15 || r[0].getDenominator() != 8 || r[1].getNumerator() != 15
            || r[1].getDenominator() != 8) {
            System.out.printf("increment() not working properly: %s + 1 => %s, %s%n", "7/8", r[0].toString(), r[1].toString());
            errors++;
        }

        r[0].setNums(7, 8);
        r[1] = r[0].decrement();
        if (r[0].getNumerator() != -1 || r[0].getDenominator() != 8 || r[1].getNumerator() != -1
            || r[1].getDenominator() != 8) {
            System.out.printf("decrement() not working properly: %s - 1 => %s, %s%n", "7/8", r[0].toString(), r[1].toString());
            errors++;
        }
        
        System.out.printf("%d error%s found by test program%n", errors, (errors == 1 ? "" : "s"));
    }
}