<?php

namespace App\Modules\Devices\Services;

use App\Modules\Devices\Models\DeviceModel;

/**
 * Device Authentication Service
 * 
 * Handles device authentication logic.
 */
class DeviceAuthService
{
    protected DeviceModel $deviceModel;

    public function __construct()
    {
        $this->deviceModel = new DeviceModel();
    }

    /**
     * Authenticate device by device_code and api_key
     * 
     * @param string $deviceCode Device code
     * @param string $apiKey API key
     * @return array|null Returns device data if authenticated, null otherwise
     */
    public function authenticate(string $deviceCode, string $apiKey): ?array
    {
        // Find active device by device_code
        $device = $this->deviceModel->findActiveByDeviceCode($deviceCode);

        if (!$device) {
            return null;
        }

        // For development: compare plain api_key
        // In production, should use password_verify() with hashed api_key
        if ($device->api_key !== $apiKey) {
            return null;
        }

        // Update last_seen_at
        $this->touchLastSeen($device->id);

        return [
            'device_id'   => $device->id,
            'device_code' => $device->device_code,
            'device_name' => $device->device_name,
            'latitude'    => $device->latitude !== null ? (float) $device->latitude : null,
            'longitude'   => $device->longitude !== null ? (float) $device->longitude : null,
            'radius_meters' => $device->radius_meters !== null ? (int) $device->radius_meters : null,
        ];
    }

    /**
     * Update last_seen_at timestamp for device
     * 
     * @param int $deviceId Device ID
     * @return void
     */
    public function touchLastSeen(int $deviceId): void
    {
        $this->deviceModel->updateLastSeen($deviceId);
    }
}