<?php

class Qs_String
{
    public static function decamelize($string)
    {
        return ucfirst(preg_replace('/([a-z])([A-Z])/', '$1 $2',$string));
    }
    
    public static function camelize($string)
    {
        $string = str_replace(array('-', '_'), ' ', $string); 
        $string = ucwords($string); 
        return str_replace(' ', '', $string); 
    }

    public static function dasherize($string)
    {
        return strtolower(preg_replace('/([a-z])([A-Z])/', '$1-$2', $string));
    }

    public static function fill($string, array $placeholders, $delimiters = '%%')
    {
        if (!is_string($delimiters) || strlen($delimiters) != 2) {
            trigger_error('Delimiters argument must be 2 characters string', E_USER_WARNING);
            return false;
        }
        $leftDelimiter = $delimiters[0];
        $rightDelimiter = $delimiters[1];
        $keys = array_map(
            function($value) use ($leftDelimiter, $rightDelimiter) {
                return "{$leftDelimiter}{$value}{$rightDelimiter}";
            },
            array_keys($placeholders)
        );
        return str_replace($keys, $placeholders, $string);
    }

    public static function formatDateRange($start, $end, $options = [])
    {
        $emptyText = empty($options['emptyText']) ? '' : $options['emptyText'];
        if (empty($start)) {
            return $emptyText;
        }

        $monthFormat = empty($options['monthFormat']) ? '%b' : $options['monthFormat'];
        $dayFormat   = empty($options['dayFormat'])   ? '%e'  : $options['dayFormat'];
        $yearFormat  = empty($options['yearFormat'])  ? '%Y'  : $options['yearFormat'];

        $formats = array(
            'oneDay'     => "{m1} {d1}, {y1}",                   // Oct. 1, 2013
            'oneMonth'   => "{m1} {d1}-{d2}, {y1}",              // Oct. 1-20, 2013
            'oneYear'    => "{m1} {d1} - {m2} {d2}, {y1}",       // Oct. 1 - Dec. 20, 2013
            'multiYears' => "{m1} {d1}, {y1} - {m2} {d2}, {y2}", // Oct. 1, 2013 - Dec. 20, 2014
        );

        if (!empty($options['formats']) && is_array($options['formats'])) {
            $formats = array_merge($formats, $options['formats']);
        }

        $getDate = function($time, $index) use ($monthFormat, $dayFormat, $yearFormat) {
            return [
                "{m{$index}}" => strftime($monthFormat, $time),
                "{d{$index}}" => trim(strftime($dayFormat, $time)),
                "{y{$index}}" => strftime($yearFormat, $time),
            ];
        };

        $formatDate = function ($format, $startTime, $endTime = null) use ($getDate) {
            $map = $getDate($startTime, 1);
            if ($endTime) {
                $map = array_merge($map, $getDate($endTime, 2));
            }
            return str_replace(array_keys($map), array_values($map), $format);
        };

        $startTime = strtotime($start);
        if (empty($end)) {
            return $formatDate($formats['oneDay'], $startTime);
        }
        $endTime = strtotime($end);

        if (idate('Y', $startTime) == idate('Y', $endTime)) {
            if (idate('m', $startTime) == idate('m', $endTime)) {
                if (idate('d', $startTime) == idate('d', $endTime)) {
                    return $formatDate($formats['oneDay'], $startTime, $endTime);
                } else {
                    return $formatDate($formats['oneMonth'], $startTime, $endTime);
                }
            } else {
                return $formatDate($formats['oneYear'], $startTime, $endTime);
            }
        }
        return $formatDate($formats['multiYears'], $startTime, $endTime);
    }

    public static function stripTags($string)
    {
        $string = strip_tags($string);
        $string = preg_replace("/[\n\r]+/", "\n", $string);
        $string = preg_replace("/\s+/", " ", $string);
        $string = html_entity_decode($string, ENT_COMPAT | ENT_QUOTES | ENT_HTML401);
        return $string;
    }
}