<?php

namespace NoccyLabs\Juicer\Helper;

/**
 * Normalize percentages to a full 100%.
 *
 */
class Normalizer
{

    protected $inputs = [];

    protected $ratio = 0;

    /**
     * Normalizer constructor.
     *
     * @param array The percentages indexed by a unique key
     */
    public function __construct(array $inputPercents=[])
    {
        foreach ($inputPercents as $k=>$p)
            $this->setPart($k, $p);
    }

    /**
     * Set the percentage of a component.
     *
     * @param mixed The key used to access this part later
     * @param float The percent of this part
     */
    public function setPart($key, float $percent)
    {
        $this->inputs[$key] = $percent;
        $total = array_sum(array_values($this->inputs));
        $this->ratio = 100 / $total;
    }

    /**
     * Get the original percentage of the key.
     *
     * @param mixed The key
     * @return float Original percentage as provided
     */
    public function getPercent($key)
    {
        if (!array_key_exists($key, $this->inputs))
            throw new \Exception();

        return floatval($this->inputs[$key]);
    }

    /**
     * Get the normalized percentage where the added total equals 100%
     *
     * @param mixed The key
     * @return float Normalized percentage as provided
     */
    public function getNormalizedPercent($key)
    {
        if (!array_key_exists($key, $this->inputs))
            throw new \Exception();

        return floatval($this->inputs[$key]) * $this->ratio;
    }

}