<?php
declare(strict_types=1);

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

final class SlaReport
{
    public function __construct(
        private readonly ?ReportFilters $filters = null,
        private readonly ?ReportDataMapper $mapper = null,
    ) {}

    /** @param list<array<string, mixed>> $agreements
     *  @return list<array<string, mixed>>
     */
    public function rows(array $agreements, string $audience = ReportAudience::INTERNAL): array
    {
        ReportAudience::validate($audience);
        $filters = $this->filters ?? new ReportFilters();
        $mapper = $this->mapper ?? new ReportDataMapper();
        $rows = [];
        foreach ($agreements as $agreement) {
            if (!$filters->matches($agreement)) continue;
            $allocated = max(0.0, (float)($agreement['allocated_hours'] ?? 0));
            $used = 0.0;
            foreach ((array)($agreement['hours'] ?? []) as $hours) $used += max(0.0, (float)$hours);
            $used = round($used, 2);
            $remaining = round(max(0.0, $allocated - $used), 2);
            $percentage = $allocated > 0 ? round(($used / $allocated) * 100, 2) : ($used > 0 ? 100.0 : 0.0);
            $status = $used > $allocated ? 'exceeded' : ($percentage >= 90 ? 'critical' : ($percentage >= 75 ? 'warning' : 'within_limit'));
            $record = [
                'client_id' => (int)($agreement['client_id'] ?? 0),
                'client_name' => (string)($agreement['client_name'] ?? ''),
                'allocated_hours' => $allocated,
                'used_hours' => $used,
                'remaining_hours' => $remaining,
                'usage_percentage' => $percentage,
                'status' => $status,
            ];
            $rows[] = $audience === ReportAudience::CLIENT ? $mapper->clientSla($record) : $mapper->internalSla($record);
        }
        usort($rows, static fn(array $a, array $b): int => strcmp((string)$a['client_name'], (string)$b['client_name']) ?: ((int)$a['client_id'] <=> (int)$b['client_id']));
        return $rows;
    }

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

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