<?php

namespace MintyPHP\Service\Data;

class GridUserCountEnricher
{
    /**
     * Collect entity IDs from grid rows, batch-query total and active user
     * counts, and return a lookup map keyed by entity ID.
     *
     * @param array[]                        $rows        Grid result rows (each must have an 'id' key).
     * @param callable(list<int>): array<int,int> $countTotal  fn(ids) => [entityId => totalCount]
     * @param callable(list<int>): array<int,int> $countActive fn(ids) => [entityId => activeCount]
     * @return array<int, array{active_users: int, inactive_users: int}>
     */
    public function computeCounts(array $rows, callable $countTotal, callable $countActive): array
    {
        $ids = [];
        foreach ($rows as $row) {
            $id = (int) ($row['id'] ?? 0);
            if ($id > 0) {
                $ids[] = $id;
            }
        }
        $ids = array_values(array_unique($ids));

        if (!$ids) {
            return [];
        }

        $totalCounts = $countTotal($ids);
        $activeCounts = $countActive($ids);

        $result = [];
        foreach ($ids as $id) {
            $total = (int) ($totalCounts[$id] ?? 0);
            $active = (int) ($activeCounts[$id] ?? 0);
            $result[$id] = [
                'active_users' => $active,
                'inactive_users' => max(0, $total - $active),
            ];
        }

        return $result;
    }
}
