<?php
declare(strict_types=1);

namespace App\Domain\Reporting {

require_once __DIR__ . '/ReportFilters.php';

/** Deterministic, storage-agnostic filtering for a client's status history. */
final class ClientHistoryService
{
    /** @param list<array<string,mixed>> $rows @return list<array<string,mixed>> */
    public function filter(array $rows, array|\ReportFilters|null $criteria = null): array
    {
        $filters = $criteria instanceof \ReportFilters ? $criteria : \ReportFilters::fromArray($criteria ?? []);
        $result = [];
        foreach ($rows as $row) {
            if (!is_array($row) || !$filters->matches($row)) continue;
            $result[] = $row;
        }
        usort($result, static fn (array $a, array $b): int => strcmp((string)($a['changed_at'] ?? $a['created_at'] ?? ''), (string)($b['changed_at'] ?? $b['created_at'] ?? '')) ?: ((int)($a['id'] ?? 0) <=> (int)($b['id'] ?? 0)));
        return $result;
    }

    /** @return list<array<string,mixed>> */
    public function forClient(array $rows, int|string $clientId, array $criteria = []): array
    {
        if (!is_int($clientId) && (!is_string($clientId) || preg_match('/^[1-9]\d*$/', trim($clientId)) !== 1)) throw new \InvalidArgumentException('Client ID must be a positive integer.');
        $criteria['client_id'] = (int)$clientId;
        return $this->filter($rows, $criteria);
    }

    /** @return array<string,mixed> */
    public function validateForClient(mixed $clientId, array $rows, array $criteria = []): array
    {
        $id = $this->positiveId($clientId);
        if ($id === null) return ['valid' => false, 'client_id' => null, 'timeline' => [], 'errors' => ['client_id' => 'Client ID must be a positive integer.']];
        return ['valid' => true, 'client_id' => $id, 'timeline' => $this->forClient($rows, $id, $criteria), 'errors' => []];
    }

    /** Controller-ready client history timeline command. */
    public function timeline(array $rows, mixed $clientId, array $criteria = []): array
    {
        return $this->validateForClient($clientId, $rows, $criteria);
    }

    /** @return list<array<string,mixed>> */
    public function history(array $rows, array|\ReportFilters|null $criteria = null): array { return $this->filter($rows, $criteria); }
    /** @return list<array<string,mixed>> */
    public function query(array $rows, array|\ReportFilters|null $criteria = null): array { return $this->filter($rows, $criteria); }
    /** @return list<array<string,mixed>> */
    public function getHistory(array $rows, array|\ReportFilters|null $criteria = null): array { return $this->filter($rows, $criteria); }

    private function positiveId(mixed $value): ?int
    {
        if (is_int($value) && $value > 0) return $value;
        if (is_string($value) && preg_match('/^[1-9]\\d*$/', trim($value)) === 1) { $id = filter_var(trim($value), FILTER_VALIDATE_INT); return $id === false ? null : $id; }
        return null;
    }
}
}

namespace {
    if (!class_exists('ClientHistoryService', false)) class_alias('App\\Domain\\Reporting\\ClientHistoryService', 'ClientHistoryService');
}