#include <iostream>
#include <fstream>
#include <climits>
#include <utils.hh>

void debug(DebugLevel level, std::string message) {
    if (level >= INFO) {
        std::cerr << DEBUGCHARS[level] << " " << message << std::endl;
    }
}

Random::Random() {
    device.open("/dev/urandom", std::ios::binary);
}

unsigned int Random::rand() {
    unsigned int rawnum;
    int c;
    
    for (int i = 0; i < sizeof(int); i++) {
        c = device.get();
        if (c < 0) {
            debug(CRITICAL, "Read from random source failed");
            return 0;
        }
        
        *((unsigned char *) &rawnum + i) = c;
    }

    return rawnum;
}

int Random::random_in_range(int min, int max) {
    // Range is inclusive, rangesize = count of possible values
    int rangesize = max - min + 1;
    unsigned int raw = rand();
    
    // Force random range to be divisable by rangesize
    // Eg. to get random in range [1,3], rangesize = 3
    // If INT_MAX = 7, values are forced to range [0, 5]
    // Thus, results are [1,2,3,1,2,3], yielding uniform distribution
    while (raw >= (INT_MAX - INT_MAX % rangesize)) {
        raw = rand();
    }
    
    return min + raw % rangesize;
}