#include <alignment/statistics/StatUtils.hpp>

#ifndef __WORDSIZE
#include <bits/user.h>
#endif

void InitializeRandomGenerator(int value) { srandom((unsigned)value); }

unsigned int RandomUnsignedInt(unsigned int randMax)
{
    //
    //  step 1, pack an unsigned integer with a random value, this
    //
    unsigned int randVal = RAND_MAX * (1.0 * random()) / RAND_MAX;

    // step 2,
    unsigned int lastBit = random() % 2;
    lastBit = lastBit << (__WORDSIZE / 2 - 1);
    // This should never overflow, add a 31-bit number into a 32.
    randVal += lastBit;
    double fpRandVal = 1.0 * randVal;
    return (randMax * fpRandVal / UINT_MAX);
}

unsigned int RandomInt(int randMax)
{
    int randVal = (randMax * ((1.0 * random()) / RAND_MAX));
    return std::min(randMax - 1, randVal);
}

unsigned int RandomInt(unsigned int min, unsigned int max) { return RandomInt(max - min) + min; }

float Random() { return (RandomInt(0, RAND_MAX) * 1.0) / RAND_MAX; }

bool FindQNorm(float prob, float& nStdDev)
{
    if (prob < 0.5 or prob > 1.0) {
        return false;
    } else {
        nStdDev = qnorm[(int)((prob - 0.50) * 500)];
        return true;
    }
}