#include "rng_abstract.h"

#include <QDebug>

QVector<int> RNG_Abstract::makeNumbersVector(int n, int min, int max)
{
    const int bins = max - min + 1;
    QVector<int> result(bins);
    for (int i = 0; i < n; ++i) {
        int number = rand(min, max);
        if ((number < min) || (number > max)) {
            qDebug() << "rand(" << min << "," << max << ") returned " << number;
        } else {
            result[number - min]++;
        }
    }
    return result;
}

double RNG_Abstract::testRandom(const QVector<int> &numbers) const
{
    int n = 0;
    for (int i = 0; i < numbers.size(); ++i) {
        n += numbers[i];
    }
    double expected = (double)n / (double)numbers.size();
    double chisq = 0;
    for (int i = 0; i < numbers.size(); ++i) {
        chisq += ((double)numbers[i] - expected) * ((double)numbers[i] - expected) / expected;
    }

    return chisq;
}