<?php

class Helper {
    public static function parseHolidays($config) {
        $text = $config['holidays']['text'];
        $from = DateTime::createFromFormat('Y-m-d', $config['holidays']['from']);
        $until = DateTime::createFromFormat('Y-m-d', $config['holidays']['until']);
        $text = preg_replace('/\{\{from\}\}/', $from->format('d.m.Y'), $text);
        $text = preg_replace('/\{\{until\}\}/', $until->format('d.m.Y'), $text);

        return $text;
    }

    public static function isHoliday($config) {
        if(!array_key_exists('holidays', $config)) {
            throw new Exception('holidays missing in config');
        }

        if(!array_key_exists('from', $config['holidays']) || !array_key_exists('until', $config['holidays'])) {
            throw new Exception('from/until missing in holidays config');
        }

        $from = DateTime::createFromFormat('Y-m-d', $config['holidays']['from']);
        $from->setTime(0, 0);
        $until = DateTime::createFromFormat('Y-m-d', $config['holidays']['until']);
        $until->setTime(23, 59, 59);

        $today = new DateTime();
        $today->setTime(0, 0);

        $dialogShowFrom = clone $from;

        if(array_key_exists('before', $config['holidays']) && !empty($config['holidays']['before'])) {
            $dialogShowFrom->sub(new DateInterval('P' . $config['holidays']['before']));
        }

        return ($dialogShowFrom <= $today && $until > $today);
    }
}