<?php
namespace Respect\Validation\Rules;

use DateTime;
use Respect\Validation\Exceptions\ComponentException;

class Age extends AllOf
{
    public $minAge;
    public $maxAge;

    public function __construct($minAge = null, $maxAge = null)
    {
        if (null === $minAge && null === $maxAge) {
            throw new ComponentException('An age interval must be provided');
        }

        if (null !== $minAge && null !== $maxAge && $maxAge <= $minAge) {
            throw new ComponentException(sprintf('%d cannot be greater than or equals to %d', $minAge, $maxAge));
        }

        $this->setMinAge($minAge);
        $this->setMaxAge($maxAge);
    }

    private function createDateTimeFromAge($age)
    {
        $interval = sprintf('-%d years', $age);

        return new DateTime($interval);
    }

    private function setMaxAge($maxAge)
    {
        $this->maxAge = $maxAge;

        if (null === $maxAge) {
            return;
        }

        $minDate = $this->createDateTimeFromAge($maxAge);
        $minDate->setTime(0, 0, 0);

        $minRule = new Min($minDate, true);

        $this->addRule($minRule);
    }

    private function setMinAge($minAge)
    {
        $this->minAge = $minAge;

        if (null === $minAge) {
            return;
        }

        $maxDate = $this->createDateTimeFromAge($minAge);
        $maxDate->setTime(23, 59, 59);

        $maxRule = new Max($maxDate, true);

        $this->addRule($maxRule);
    }
}