<?php
namespace App\Modules\Purchasing;

/** Classification only; balances/terms remain in their existing authoritative readers. */
final class PayableAge
{
    public static function classify(array $row,?string $reference):array
    {
        $days=null;$bucket=null;
        if($reference!==null){
            if(!$row['obligation_id'])$bucket='unrecognised';
            elseif($row['source_conflict']||$row['balance_minor']===null)$bucket='indeterminate';
            elseif($row['balance_minor']==='0')$bucket='settled';
            elseif(($due=$row['reviewed_terms']['due_on']??null)===null)$bucket='unknown';
            else{$zone=new \DateTimeZone('UTC');$days=max(0,(int)(new \DateTimeImmutable($due,$zone))->diff(new \DateTimeImmutable($reference,$zone))->format('%r%a'));$bucket=$days===0?'not_due':($days<=30?'days_1_30':($days<=60?'days_31_60':($days<=90?'days_61_90':'days_over_90')));}
        }
        return ['reviewed_age_days'=>$days,'reviewed_age_bucket'=>$bucket];
    }
}