#include "histogram.h"
#include <vector>
#include <iostream>
using namespace std;

void
find_minmax(const std::vector<double>& numbers, double& min, double& max) {
    min = numbers[0];
    max = numbers[0];
    for (double x : numbers)
        {
            if (x < min) {min = x;}
            else if (x > max) {max = x;}
        }
}

std::vector<double>
make_histogram(const std::vector<double>& numbers, size_t bin_count)
{
    std::vector<double> bins (bin_count);
    double min = 0, max = 0;
    find_minmax(numbers, min, max);
    double bin_size = (max - min) / bin_count;
    for (int i = 0; i < numbers.size(); i++)
        {
            bool found = false;
            for (int 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;
}