#include "random.qh"

void RandomSelection_Init()
{
    RandomSelection_totalweight = 0;
    RandomSelection_chosen_ent = NULL;
    RandomSelection_chosen_float = 0;
    RandomSelection_chosen_string = string_null;
    RandomSelection_best_priority = -1;
}

void RandomSelection_Add(entity e, float f, string s, float weight, float priority)
{
    if (priority > RandomSelection_best_priority)
    {
        RandomSelection_best_priority = priority;
        RandomSelection_chosen_ent = e;
        RandomSelection_chosen_float = f;
        RandomSelection_chosen_string = s;
        RandomSelection_totalweight = weight;
    }
    else if (priority == RandomSelection_best_priority)
    {
        RandomSelection_totalweight += weight;
        if (random() * RandomSelection_totalweight <= weight)
        {
            RandomSelection_chosen_ent = e;
            RandomSelection_chosen_float = f;
            RandomSelection_chosen_string = s;
        }
    }
}


// prandom - PREDICTABLE random number generator (not seeded yet)

#ifdef USE_PRANDOM
float prandom_seed;
float prandom()
{
    float c;
    c = crc16(false, strcat(ftos(prandom_seed), ftos(prandom_seed + M_PI)));
    prandom_seed = c;

#ifdef USE_PRANDOM_DEBUG
    LOG_TRACE("RANDOM -> ", ftos(c), "\n");
#endif

    return c / 65536; // in [0..1[
}

vector prandomvec()
{
    vector v;

    do
    {
        v.x = prandom();
        v.y = prandom();
        v.z = prandom();
    }
    while(v * v > 1);

    return v;
}

void psrandom(float seed)
{
    prandom_seed = seed;
#ifdef USE_PRANDOM_DEBUG
    LOG_TRACE("SRANDOM ", ftos(seed), "\n");
#endif
}

#ifdef USE_PRANDOM_DEBUG
void prandom_debug()
{
    LOG_TRACE("Current random seed = ", ftos(prandom_seed), "\n");
}
#endif
#endif