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import java.util.Random;

public class FractionOperator extends Operator {

private int numerator;

private int denominator;

public FractionOperator(Difficulty diff, Random rand) {

super(diff, rand);

shuffle();

}

public Operator cloneThis() {

FractionOperator n = new FractionOperator(this.diff, this.rand);

n.numerator = this.numerator;

n.denominator = this.denominator;

return n;

}

public void shuffle() {

// We need to cheat for this operator to be useful, so no real shuffling here

numerator = 0;

denominator = 0;

}

public boolean worksForInput(int in) {

// find a denominator

denominator = 0;

for (int i = 12; i > 2; --i) {

if (in % i == 0)

denominator = i;

if (rand.nextInt(100) < 60)

break;

}

// fail?

if (denominator == 0) {

return false;

}

// use a numerator?

if (rand.nextBoolean()) {

numerator = rand.nextInt(denominator - 1) + 2;

} else {

numerator = 1;

}

return true;

}

public int getOutput() {

return prev.getOutput() * numerator / denominator;

}

public String toString() {

if (numerator == 1) {

if (denominator == 2)

return "halbieren";

return "durch " + denominator;

} else {

return "" + numerator + " / " + denominator + " davon";

}

}

public String toTexString() {

if (numerator == 1) {

if (denominator == 2)

return "halbieren";

return "durch " + denominator;

} else {

return "$\\frac{" + numerator + "}{" + denominator + "}$ "+ " davon";

}

}

}