<?php
declare(strict_types=1);

require_once __DIR__ . '/ReportFilters.php';
require_once __DIR__ . '/ReportDataMapper.php';
require_once __DIR__ . '/ReportQuery.php';
require_once __DIR__ . '/ReportAudience.php';

/** Deterministic technician workload totals, with a client-safe projection. */
final class TechnicianWorkloadReport implements ReportQuery
{
    public function __construct(
        private readonly ?ReportFilters $filters = null,
        private readonly ?ReportDataMapper $mapper = null,
    ) {}

    /** @param list<array<string,mixed>> $rows @return list<array<string,mixed>> */
    public function build(array $rows, string $audience = ReportAudience::INTERNAL): array
    {
        ReportAudience::validate($audience);
        $filters = $this->filters ?? new ReportFilters();
        $totals = [];
        foreach ($rows as $row) {
            if (!$filters->matches($row)) continue;
            $technicianId = (int)($row['technician_id'] ?? 0);
            $clientId = (int)($row['client_id'] ?? 0);
            $key = $audience === ReportAudience::CLIENT ? 'client:' . $clientId : 'technician:' . $technicianId;
            if (!isset($totals[$key])) {
                $totals[$key] = $audience === ReportAudience::CLIENT
                    ? ['client_id' => $clientId, 'client_name' => (string)($row['client_name'] ?? ''), 'hours' => 0.0, 'sla_hours' => 0.0]
                    : ['technician_id' => $technicianId, 'technician_name' => (string)($row['technician_name'] ?? ''), 'hours' => 0.0, 'sla_hours' => 0.0];
            }
            $hours = max(0.0, (float)($row['hours'] ?? 0));
            $totals[$key]['hours'] += $hours;
            if (!empty($row['counts_toward_sla'])) $totals[$key]['sla_hours'] += $hours;
        }
        $result = array_values($totals);
        foreach ($result as &$item) {
            $item['hours'] = round($item['hours'], 2);
            $item['sla_hours'] = round($item['sla_hours'], 2);
        }
        unset($item);
        usort($result, static fn (array $a, array $b): int => array_key_exists('client_id', $a)
            ? (strcmp((string)($a['client_name'] ?? ''), (string)($b['client_name'] ?? '')) ?: ((int)$a['client_id'] <=> (int)$b['client_id']))
            : (strcmp((string)($a['technician_name'] ?? ''), (string)($b['technician_name'] ?? '')) ?: ((int)$a['technician_id'] <=> (int)$b['technician_id'])));
        return $result;
    }

    public function query(array $rows, string $audience = ReportAudience::INTERNAL): array { return $this->build($rows, $audience); }
}