<?php

declare(strict_types=1);

namespace RJT\TitleCase\Internal;

/**
 * @internal
 */
final class AddressDetector
{
    public static function isLikelyAddress(string $normalized): bool
    {
        if ($normalized === '') {
            return false;
        }

        $stateAlt = UspsStateCodes::regexAlternation();

        $startsLikeStreet = preg_match('/^\\d+\\b/', $normalized) === 1
            || preg_match('/^(?:po|rr)\\b/i', $normalized) === 1;

        $hasZip = preg_match('/\\b\\d{5}(?:-\\d{4})?\\b/', $normalized) === 1;
        $hasComma = strpos($normalized, ',') !== false;
        $commaCount = $hasComma ? substr_count($normalized, ',') : 0;

        $hasUpperExceptionToken = preg_match('/\\b(?:PO|RR|NE|NW|SE|SW)\\b/i', $normalized) === 1;
        $hasStateToken = preg_match('/\\b(?:' . $stateAlt . ')\\b/i', $normalized) === 1;
        $endsWithStateOrNumber = preg_match(
            '/(?:\\b(?:' . $stateAlt . ')\\b|\\b\\d+\\b)\\s*$/i',
            $normalized
        ) === 1;
        $hasCommaStateZip = $hasComma && $hasZip && preg_match(
            '/,\\s*(?:' . $stateAlt . ')\\s+\\d{5}(?:-\\d{4})?\\b/i',
            $normalized
        ) === 1;
        $endsWithCommaState = $hasComma && preg_match('/,\\s*(?:' . $stateAlt . ')\\s*$/i', $normalized) === 1;
        $hasStateZipNoComma = $hasZip && preg_match(
            '/\\b(?:' . $stateAlt . ')\\b\\s+\\d{5}(?:-\\d{4})?\\b/i',
            $normalized
        ) === 1;

        $caseA = $startsLikeStreet && $hasUpperExceptionToken && $hasStateToken && $endsWithStateOrNumber;
        $caseB = $startsLikeStreet && $commaCount >= 2 && $hasStateToken && $endsWithStateOrNumber;

        return $caseA || $caseB || $hasCommaStateZip || $endsWithCommaState || $hasStateZipNoComma;
    }
}