#include "histogram.h"
#include <vector>

void find_minmax(const std::vector <double> &numbers, double &min, double &max, bool &res ){

    if (numbers.size()==0){
        res = true;
        return;
    }

    min = numbers[0];
    max = numbers[0];
    for ( double x : numbers ){
        if ( x < min ){
            min = x;
        } else if ( x > max ){
            max = x;
        }
    }
}

std::vector<std::size_t> make_histogram(const std::vector<double> &numbers, std::size_t bin_count) {
    double min, max;
    bool res = false;
    find_minmax(numbers, min, max, res);
    double bin_size = ( max - min ) / bin_count;
    std::vector<std::size_t> bins ( bin_count );
    for (std::size_t i=0; i <  numbers.size(); i++ ){
        bool found = false;
        for (std::size_t j = 0; ( j < bin_count - 1 ) && !found; j++ ){
            auto lo = min + j * bin_size;
            auto hi = min + ( j + 1 ) * bin_size;
            if (lo <= numbers[i] && ( numbers[i] < hi )){
                bins[j]++;
                found = true;
            }
        }
        if ( !found ){
            bins[bin_count-1]++;
        }
    }
    return bins;
}