<?php

declare(strict_types=1);

namespace App\BusProNet\XmlParser;

use App\BusProNet\Model\AgeConstraintResult;

/**
 * Parser for birth year constraint data in JG:YYYY-YYYY format.
 *
 * This parser handles constraint data that specifies birth year ranges,
 * such as 'JG:2007-2009' (Jahrgang 2007 to 2009) or 'JG:2007' (single year).
 */
class BirthYearConstraintParser implements AgeConstraintParserInterface
{
    private const BIRTH_YEAR_PREFIX = 'JG:';

    public function canParse(string $constraintData): bool
    {
        return str_starts_with($constraintData, self::BIRTH_YEAR_PREFIX);
    }

    public function parse(string $constraintData): AgeConstraintResult
    {
        if (false === $this->canParse($constraintData)) {
            throw new \InvalidArgumentException('Cannot parse constraint data: ' . $constraintData);
        }

        $yearData = substr($constraintData, strlen(self::BIRTH_YEAR_PREFIX));

        // Parse range format "2007-2009"
        if (str_contains($yearData, '-')) {
            [$fromYear, $toYear] = explode('-', $yearData, 2);

            return new AgeConstraintResult(
                type: 'birth_year',
                birthYearFrom: (int) trim($fromYear),
                birthYearTo: (int) trim($toYear),
                metadata: [
                    'range_type' => 'birth_year_range',
                    'original_format' => $yearData,
                ],
                rawData: $constraintData
            );
        }

        // Parse single year format "2007"
        $year = (int) trim($yearData);

        return new AgeConstraintResult(
            type: 'birth_year',
            birthYearFrom: $year,
            birthYearTo: $year,
            metadata: [
                'range_type' => 'birth_year_single',
                'original_format' => $yearData,
            ],
            rawData: $constraintData
        );
    }

    public function getConstraintType(): string
    {
        return 'birth_year';
    }
}