<?php

namespace Mos\Dice;

/**
 * A trait implementing histogram for integers.
 */
trait HistogramTrait
{
    /**
     * @var array $serie  The numbers stored in sequence.
     */
    private $serie = [];



    /**
     * Get the serie.
     *
     * @return array with the serie.
     */
    public function getHistogramSerie()
    {
        return $this->serie;
    }



    /**
     * Print out the histogram, default is to print out only the numbers
     * in the serie, but when $min and $max is set then print also empty
     * values in the serie, within the range $min, $max.
     *
     * @param int $min The lowest possible integer number.
     * @param int $max The highest possible integer number.
     *
     * @return string representing the histogram.
     */
    public function printHistogram(int $min = null, int $max = null)
    {
        $arr = $this->getHistogramSerie();
        $histogramValue = [];
        $dataHistogram = array_count_values($arr);

        if ($min && $max) {
            for ($i = $min; $i <= $max; $i++) {
                if (array_key_exists($i, $dataHistogram)) {
                    echo ' <br>' . "$i. " . str_repeat("*", $dataHistogram[$i]);
                } else {
                     echo ' <br>' . "$i. ";
                }
            }
        } else {
            foreach ($dataHistogram as $key => $value) {
                 echo ' <br>' . "$key. " . str_repeat("*", $value);
            }
        }

    }
}