<?php

declare(strict_types=1);

namespace App\Services\Evidence;

final class EvidenceSnapshotFingerprint
{
    /**
     * @param  array<string, mixed>  $payload
     */
    public static function hash(array $payload): string
    {
        return hash('sha256', json_encode(self::normalize($payload), JSON_THROW_ON_ERROR));
    }

    private static function normalize(mixed $value): mixed
    {
        if (is_array($value)) {
            ksort($value);

            return array_map(self::normalize(...), $value);
        }

        if ($value instanceof \BackedEnum) {
            return $value->value;
        }

        if ($value instanceof \DateTimeInterface) {
            return $value->format(DATE_ATOM);
        }

        return $value;
    }
}