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<?php

    namespace Inteve\Forms;

    use Nette;
    use Nette\Forms\Form;


    class TimeInput extends Nette\Forms\Controls\BaseControl
    {
        /** @var int|NULL */
        private $hour;

        /** @var int|NULL */
        private $minute;

        /** @var string */
        private $rawValue = '';


        public function __construct($caption = NULL, $errorMessage = 'Invalid time.')
        {
            parent::__construct($caption);
            $this->addRule([__CLASS__, 'validateTime'], $errorMessage);
        }


        /**
         * @param  \DateTime|NULL
         * @return void
         */
        public function setValue($value)
        {
            if ($value === NULL) {
                $this->hour = NULL;
                $this->minute = NULL;
                $this->rawValue = '';

            } elseif ($value instanceof \DateTimeInterface) {
                $this->hour = (int) $value->format('G');
                $this->minute = (int) $value->format('i');
                $this->rawValue = $value->format('G:i');

            } elseif ($value instanceof \DateInterval) {
                $this->hour = (int) $value->format('%h');
                $this->minute = (int) $value->format('%I');
                $this->rawValue = $value->format('%h:%I');

                if (!self::validateTime($this)) {
                    $this->setValue(NULL);
                    throw new InvalidValueException('Invalid time in DateInterval.');
                }

            } else {
                throw new InvalidArgumentException('Value of type ' . gettype($value) . ' is not supported.');
            }
        }


        /**
         * @return \DateInterval|NULL
         */
        public function getValue()
        {
            if (self::validateTime($this)) {
                return new \DateInterval('PT' . $this->hour . 'H' . $this->minute . 'M');
            }

            return NULL;
        }


        /**
         * @return bool
         */
        public function isFilled()
        {
            return $this->rawValue !== '';
        }


        /**
         * @return void
         */
        public function loadHttpData()
        {
            $value = $this->getHttpData(Form::DATA_LINE);
            $this->rawValue = $value;
            $parts = explode(':', $value, 3);
            $this->hour = isset($parts[0]) ? self::toInt($parts[0]) : NULL;
            $this->minute = isset($parts[1]) ? self::toInt($parts[1]) : NULL;
        }


        /**
         * @return Nette\Utils\Html
         */
        public function getControl()
        {
            $control = parent::getControl();
            $control->value = $this->rawValue;
            return $control;
        }


        /**
         * @return bool
         */
        public static function validateTime(Nette\Forms\IControl $control)
        {
            if ($control->hour !== NULL && $control->minute !== NULL) {
                if ($control->hour < 0 || $control->hour > 23) {
                    return FALSE;
                }

                if ($control->minute < 0 || $control->minute > 59) {
                    return FALSE;
                }

                return TRUE;
            }

            return FALSE;
        }


        /**
         * @param  string
         * @return int|NULL
         */
        private static function toInt($value)
        {
            $value = trim($value);

            if ($value !== '') {
                $value = ltrim($value, '0');
                $value = $value !== '' ? $value : '0';
            }

            $tmp = abs((int) $value);
            return ((string) $tmp) === $value ? $tmp : NULL;
        }
    }