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<?php

    namespace Donut;


    class Time
    {
        /** @var string  Y-m-d H:i:s in UTC */
        private $value;


        /**
         * @param  string
         */
        public function __construct($value)
        {
            $this->value = $value;
        }


        /**
         * @return string
         */
        public function getValue()
        {
            return $this->value;
        }


        /**
         * @return bool
         */
        public function isOlderThan(Time $time)
        {
            return $this->value < $time->getValue();
        }


        /**
         * @param  Time
         * @return int
         */
        public function getMinutesTo(Time $time)
        {
            $start = $this->getDateTime();
            $end = $time->getDateTime();
            $diff = $start->diff($end);
            return ($diff->y * 365 * 24 * 60)
                + ($diff->m * 30 * 24 * 60)
                + ($diff->d * 24 * 60)
                + ($diff->h * 60)
                + ($diff->i);
        }


        /**
         * @return \DateTime
         */
        public function getDateTime()
        {
            return new \DateTime($this->value, new \DateTimeZone('UTC'));
        }


        /**
         * @return Time
         */
        public static function create($date)
        {
            if (is_int($date)) { // timestamp
                $date = new \DateTime('@' . $date, new \DateTimeZone('UTC'));
            }

            if ($date instanceof \DateTime) {
                return new static($date->format('Y-m-d H:i:s'));
            }

            $date = new \DateTime($date, new \DateTimeZone('UTC'));
            $date->setTimeZone(new \DateTimeZone('UTC'));
            return new static($date->format('Y-m-d H:i:s'));
        }


        /**
         * @param  Time
         * @param  int
         * @return Time
         */
        public static function sub(Time $time, $minutes)
        {
            $datetime = $time->getDateTime();
            $datetime->sub(new \DateInterval('PT' . abs((int) $minutes) . 'M'));
            return new static($datetime->format('Y-m-d H:i:s'));
        }
    }