<?php
declare(strict_types=1);
/**
 * Polana V20: parse the canonical, human-readable `opening_hours` setting.
 * Strict/fail-closed: an ambiguous line never makes a day bookable.
 */

function pv20_source_present(): bool {
    return trim(setting('opening_hours', '')) !== '';
}
function pv20_day_number(string $token): ?int {
    $k = strtolower(strtr(trim($token), ['ą'=>'a','ć'=>'c','ę'=>'e','ł'=>'l','ń'=>'n','ó'=>'o','ś'=>'s','ż'=>'z','ź'=>'z','Ą'=>'a','Ć'=>'c','Ę'=>'e','Ł'=>'l','Ń'=>'n','Ó'=>'o','Ś'=>'s','Ż'=>'z','Ź'=>'z']));
    $map = [
        'pon'=>1,'pn'=>1,'poniedzialek'=>1,'monday'=>1,'mon'=>1,
        'wt'=>2,'wto'=>2,'wtorek'=>2,'tuesday'=>2,'tue'=>2,'tues'=>2,
        'sr'=>3,'sro'=>3,'sroda'=>3,'wednesday'=>3,'wed'=>3,
        'czw'=>4,'cz'=>4,'czwartek'=>4,'thursday'=>4,'thu'=>4,'thur'=>4,
        'pt'=>5,'piatek'=>5,'friday'=>5,'fri'=>5,
        'sob'=>6,'sb'=>6,'sobota'=>6,'saturday'=>6,'sat'=>6,
        'nd'=>7,'niedz'=>7,'niedziela'=>7,'sunday'=>7,'sun'=>7,
    ];
    return $map[$k] ?? null;
}
function pv20_day_words_regex(): string {
    return '(?:poniedzia[łl]ek|pon|pn|wtorek|wto|wt|[śs]roda|[śs]ro|[śs]r|czwartek|czw|cz|pi[aą]tek|pt|sobota|sob|sb|niedziela|niedz|nd|monday|mon|tuesday|tues|tue|wednesday|wed|thursday|thur|thu|friday|fri|saturday|sat|sunday|sun)';
}
function pv20_parse_opening_hours(string $source): array {
    $days = array_fill_keys(array_map('strval', range(1, 7)), null);
    $errors=[];
    $matched=0;
    $decoded=html_entity_decode($source, ENT_QUOTES | ENT_HTML5, 'UTF-8');
    $decoded=(string)preg_replace('~<\s*br\s*/?\s*>~iu', "\n", $decoded);
    $decoded=(string)preg_replace('~</(?:p|div|li)>~iu', "\n", $decoded);
    $decoded=strip_tags($decoded);
    $decoded=str_replace(["\r\n","\r","\xC2\xA0"], ["\n","\n"," "], $decoded);
    $word=pv20_day_words_regex();
    // Support comma-separated entries like "Pt 13-22, Sob 13-22".
    $decoded=(string)preg_replace('/(?<=\d)\s*,\s*(?='.$word.'\b)/iu', "\n", $decoded);
    $decoded=(string)preg_replace('/\b(nieczynne|zamkni[eę]te|closed)\s*,\s*(?='.$word.'\b)/iu', "$1\n", $decoded);
    $lines=preg_split('/[\n;]+/u',$decoded) ?: [];
    foreach ($lines as $lineNo=>$rawLine) {
        $line=trim($rawLine, " \t\x0B\xC2\xA0•*- ");
        if ($line==='') continue;
        $clean=strtolower($line);
        $isHeading=(bool)preg_match('/^(?:godziny\s+(?:otwarcia|pracy)|opening\s+hours|restauracja)\s*:?$/iu',$clean);
        if ($isHeading) continue;
        preg_match_all('/(?<!\p{L})'.$word.'(?!\p{L})/iu',$line,$hits,PREG_OFFSET_CAPTURE);
        if (empty($hits[0])) {
            $errors[]='Linia '.($lineNo+1).': brak rozpoznanego dnia tygodnia.';
            continue;
        }
        $numbers=[];
        foreach ($hits[0] as $match) {
            $n=pv20_day_number($match[0]);
            if ($n!==null) $numbers[]=$n;
        }
        if (!$numbers) { $errors[]='Linia '.($lineNo+1).': nieznany dzień tygodnia.';continue; }
        $labelEnd=$hits[0][count($hits[0])-1][1]+strlen($hits[0][count($hits[0])-1][0]);
        $dayPart=substr($line,0,$labelEnd);
        $rest=trim(substr($line,$labelEnd)," \t:—–-|");
        // e.g. "Pon–Pt 12:00–21:00": both days define an inclusive range.
        if (count($numbers)===2 && preg_match('/[-–—]|\bdo\b|\bto\b/iu',$dayPart)) {
            $first=$numbers[0];$last=$numbers[1];
            if ($first<=$last) $numbers=range($first,$last);
            else { $errors[]='Linia '.($lineNo+1).': odwrócony zakres dni.';continue; }
        }
        $numbers=array_values(array_unique($numbers));
        if (preg_match('/\b(?:nieczynne|nieczynny|zamkni[eę]te|zamkni[eę]ty|closed|off)\b/iu',$rest)) {
            $window=null;
        } else {
            // Accept 15-21, 15:00–21:00, 15.00 do 21.00, 15:00 - 22:00.
            preg_match_all('/(?<![\d:])(?:[01]?\d|2[0-4])(?:[:.]\d{2})?(?![\d:])/u',$rest,$matches);
            if (count($matches[0])!==2) { $errors[]='Linia '.($lineNo+1).': oczekiwane godziny od–do (np. 15:00–21:00).';continue; }
            $values=[];
            foreach ($matches[0] as $idx=>$raw) {
                $v=str_replace('.',':',$raw);
                if (!str_contains($v,':')) $v.=':00';
                [$h,$m]=array_map('intval',explode(':',$v));
                if ($h>24||$m>59||($h===24 && ($m!==0 || $idx===0))) {
                    $values=[];break;
                }
                $values[]=sprintf('%02d:%02d',$h,$m);
            }
            if (count($values)!==2 || ((int)substr($values[0],0,2)*60+(int)substr($values[0],3)) >= ((int)substr($values[1],0,2)*60+(int)substr($values[1],3))) {
                $errors[]='Linia '.($lineNo+1).': nieprawidłowy zakres godzin.';continue;
            }
            $window=['open'=>$values[0],'close'=>$values[1]];
        }
        foreach ($numbers as $dayNo) {
            $key=(string)$dayNo;
            if (isset($seen[$key]) && $days[$key]!==$window) {
                $errors[]='Linia '.($lineNo+1).': sprzeczne godziny dla dnia '.$dayNo.'.';
            }
            $seen[$key]=true;
            $days[$key]=$window;
            $matched++;
        }
    }
    if (!$matched) $errors[]='Nie rozpoznano żadnego dnia ani godzin otwarcia.';
    // A parsing error makes the entire schedule unavailable until corrected.
    if ($errors) $days=array_fill_keys(array_map('strval',range(1,7)),null);
    return ['days'=>$days,'errors'=>$errors,'matched'=>$matched];
}
function pv20_opening_status():array {
    $source=setting('opening_hours','');
    if(trim($source)==='') return ['active'=>false,'days'=>[],'errors'=>[],'matched'=>0];
    return ['active'=>true]+pv20_parse_opening_hours($source);
}
function pv20_apply_opening_hours(array $cfg):array {
    $status=pv20_opening_status();
    if (!$status['active']) return $cfg; // old manual schedule still works
    $cfg['days']=$status['days'];
    if ($status['errors']) $cfg['_opening_hours_error']=true;
    return $cfg;
}