<?php

namespace App\Http\Business;

use Luticate\Utils\LuBusiness;
use App\Http\DataAccess\SensorsDataAccess;
use App\Http\DBO\SensorsDbo;

class SensorsBusiness extends LuBusiness {
    protected static function getDataAccess()
    {
        return new SensorsDataAccess();
    }

    protected static function checkSensor(SensorsDbo $sensor, $sensor_id = null)
    {
        $existingSensor = SensorsDataAccess::getByName($sensor->getName());
        if (!is_null($existingSensor) && $sensor_id != $existingSensor->getId()) {
            self::badInput("Sensor name already exists");
        }
        if (is_null($sensor->getName()) || strlen($sensor->getName()) == 0) {
            self::badInput("Missing sensor name");
        }
        HostsBusiness::getById($sensor->getHostId());
        SensorTypesBusiness::getById($sensor->getSensorTypeId());
        if (is_null($sensor->getDescription())) {
            $sensor->setDescription("");
        }
        if (is_null($sensor->getData()) || strlen($sensor->getData()) == 0) {
            $sensor->setData("{}");
        }
        $json = json_decode($sensor->getData());
        if (is_null($json)) {
            self::badInput("Sensor data could not be converted to json");
        }
    }

    public static function add(SensorsDbo $sensor)
    {
        self::checkSensor($sensor);
        return SensorsDataAccess::addId($sensor);
    }

    public static function edit(SensorsDbo $sensor, $sensor_id)
    {
        self::getById($sensor_id);
        self::checkSensor($sensor, $sensor_id);
        $sensor->setId($sensor_id);
        return SensorsDataAccess::editById($sensor_id, $sensor);
    }

    public static function getValue($sensor_id)
    {
        self::getById($sensor_id);
        return rand(0, 42) * ($sensor_id % 2 == 0 ? 1 : -1);
    }
}