<?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 hours aggregation grouped by client. */
final class HoursPerClientReport implements ReportQuery
{
    public function __construct(
        private readonly ?ReportFilters $filters = null,
        private readonly ?ReportDataMapper $mapper = null,
    ) {}

    /** @param list<array<string,mixed>> $entries @return list<array<string,mixed>> */
    public function build(array $entries, string $audience = ReportAudience::CLIENT): array
    {
        ReportAudience::validate($audience);
        $filters = $this->filters ?? new ReportFilters();
        $selected = array_values(array_filter($entries, static fn (array $entry): bool => $filters->matches($entry)));
        $rows = $this->aggregate($selected);
        // This report contains no technician or internal-note fields, so the same
        // stable projection is safe for both audiences.
        return $rows;
    }

    /** @param list<array<string,mixed>> $entries @return list<array{client_id:int,client_name:string,hours:float}> */
    public function aggregate(array $entries): array
    {
        $totals = [];
        foreach ($entries as $entry) {
            $id = (int)($entry['client_id'] ?? 0);
            $key = (string)$id;
            if (!isset($totals[$key])) {
                $totals[$key] = ['client_id' => $id, 'client_name' => (string)($entry['client_name'] ?? ''), 'hours' => 0.0];
            }
            $totals[$key]['hours'] += max(0.0, (float)($entry['hours'] ?? 0));
        }
        $rows = array_values($totals);
        foreach ($rows as &$row) $row['hours'] = round($row['hours'], 2);
        unset($row);
        usort($rows, static fn (array $a, array $b): int => strcmp($a['client_name'], $b['client_name']) ?: ($a['client_id'] <=> $b['client_id']));
        return $rows;
    }

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