<?php
declare(strict_types=1);
namespace App\Repository\Pdo;

use App\Repository\DeviceRepository;
use PDO;

final class PdoDeviceRepository implements DeviceRepository
{
    public function __construct(private PDO $pdo) {}

    public function secretFor(string $deviceId): ?string
    {
        $st = $this->pdo->prepare('SELECT secret FROM move_devices WHERE device_id = ? LIMIT 1');
        $st->execute([$deviceId]);
        $secret = $st->fetchColumn();
        return $secret === false ? null : (string)$secret;
    }

    public function siteFor(string $deviceId): ?string
    {
        $st = $this->pdo->prepare('SELECT site FROM move_devices WHERE device_id = ? LIMIT 1');
        $st->execute([$deviceId]);
        $site = $st->fetchColumn();
        // false = no such device; null = device exists but unassigned. Both -> null (unscoped).
        return ($site === false || $site === null) ? null : (string)$site;
    }

    public function touchHeartbeat(string $deviceId, array $meta): void
    {
        // A plain UPDATE (not upsert) is safe here: the caller (HeartbeatController)
        // only reaches this after secretFor() already succeeded for the same
        // device_id, so the row is guaranteed to exist. Device rows are provisioned
        // out-of-band by an admin (see server/docs/server-deploy.md), never created
        // implicitly from an inbound heartbeat.
        $st = $this->pdo->prepare(
            'UPDATE move_devices
                SET last_fps = ?, last_temp = ?, last_throttle = ?,
                    reported_config_version = ?, last_heartbeat_at = ?
              WHERE device_id = ?'
        );
        $st->execute([
            (float)($meta['fps'] ?? 0.0),
            (float)($meta['temp'] ?? 0.0),
            !empty($meta['throttle']) ? 1 : 0,
            (int)($meta['config_version'] ?? 0),
            (int)($meta['at'] ?? time()),
            $deviceId,
        ]);
    }

    public function configVersion(string $deviceId): int
    {
        $st = $this->pdo->prepare('SELECT config_version FROM move_devices WHERE device_id = ? LIMIT 1');
        $st->execute([$deviceId]);
        $version = $st->fetchColumn();
        return $version === false ? 1 : (int)$version;
    }
}