<?php

namespace App\Services;

use App\DTOs\CollectorDTO;
use App\Entities\CollectorEntity;
use App\Entities\TrafficEntity;
use App\Forms\CollectorForm;
use App\Helpers\CollectorHelper;
use App\Libraries\SNMPLibrary;
use App\Models\CollectorModel;
use CodeIgniter\I18n\Time;
use RuntimeException;

class CollectorService extends CommonService
{
    const OID_IF_IN_OCTETS = '1.3.6.1.2.1.31.1.1.1.6.';
    const OID_IF_OUT_OCTETS = '1.3.6.1.2.1.31.1.1.1.10.';
    private $_form = null;
    private $_helper = null;

    public function __construct(CollectorModel $model)
    {
        parent::__construct($model);
        $this->addClassPaths('Collector');
    }
    public function createDTO(array $formDatas): CollectorDTO
    {
        return new CollectorDTO($formDatas);
    }
    public function getFormService(): CollectorForm
    {
        if ($this->_form === null) {
            $this->_form = new CollectorForm();
            $this->_form->setAttributes([
                'pk_field'   => $this->model->getPKField(),
                'title_field'  => $this->model->getTitleField(),
                'table'      => $this->model->getTable(),
                'useAutoIncrement' => $this->model->useAutoIncrement(),
                'class_path'   => $this->getClassPaths(false),
            ]);
        }
        return $this->_form;
    }

    public function getHelper(): CollectorHelper
    {
        if ($this->_helper === null) {
            $this->_helper = new CollectorHelper();
            $this->_helper->setAttributes([
                'pk_field'   => $this->model->getPKField(),
                'title_field'  => $this->model->getTitleField(),
                'table'      => $this->model->getTable(),
                'useAutoIncrement' => $this->model->useAutoIncrement(),
                'class_path'   => $this->getClassPaths(false),
            ]);
        }
        return $this->_helper;
    }
    //기본 기능부분
    protected function getEntity_process(mixed $entity): CollectorEntity
    {
        return $entity;
    }
    protected function create_process(array $formDatas): CollectorEntity
    {
        return new CollectorEntity($formDatas);
    }
    public function create(object $dto): CollectorEntity
    {
        if (!$dto instanceof CollectorDTO) {
            throw new RuntimeException(__METHOD__ . "에서 오류발생:" . get_class($dto) . "는 사용할수 없습니다.");
        }
        return parent::create($dto);
    }
    protected function modify_process($uid, array $formDatas): CollectorEntity
    {
        return parent::modify_process($uid, $formDatas);
    }
    public function modify($uid, object $dto): CollectorEntity
    {
        if (!$dto instanceof CollectorDTO) {
            throw new RuntimeException(__METHOD__ . "에서 오류발생:" . get_class($dto) . "는 사용할수 없습니다.");
        }
        return parent::modify($uid, $dto);
    }

    //List 검색용
    //FormFilter 조건절 처리
    //검색어조건절처리
    public function setSearchWord(string $word): void
    {
        $this->model->orLike($this->model->getTable() . "." . $this->model->getTitleField(), $word, 'both');
        parent::setSearchWord($word);
    }

    //Chart용 
    public function getAggregateDatas(TrafficEntity $trafficEntity, string $startDate, string $endDate): array
    {
        $entities = [];
        foreach ($this->getEntities(["trafficinfo_uid" => $trafficEntity->getPK(), "created_at >=" => $startDate, "created_at <=" => $endDate]) as $entity) {
            $entities[] = ['in_kbits' => $entity->getIn(), 'out_kbits' => $entity->getOut(), 'created_at' => $entity->getCreatedAt()];
        }
        return $entities;
    }
    /**
     * in_kbits과 out_kbits 두 값을 한꺼번에 구하는 함수
     */
    public function get95PercentileBoth(TrafficEntity $trafficEntity, string $startDate, string $endDate): array
    {
        return [
            'in_kbits'  => $this->model->get95PercentileValue($trafficEntity, 'in',  $startDate, $endDate),
            'out_kbits' => $this->model->get95PercentileValue($trafficEntity, 'out', $startDate, $endDate)
        ];
    }

    public function getCalculatedData(TrafficEntity $trafficEntity): array
    {
        $snmp             = new SNMPLibrary($trafficEntity->getIP(), $trafficEntity->getCommunity());
        $currentInOctets = $snmp->get(self::OID_IF_IN_OCTETS . $trafficEntity->getInterface());
        $currentOutOctets = $snmp->get(self::OID_IF_OUT_OCTETS . $trafficEntity->getInterface());

        if ($currentInOctets === null || $currentOutOctets === null) {
            $message = "트래픽 수집 실패: {$trafficEntity->getIP()} - IF{$trafficEntity->getInterface()} (UID: {$trafficEntity->getPK()})";
            log_message('error', $message);
            throw new \Exception($message);
        }
        // 이전 데이터를 조회하여 Rate 계산에 사용
        $lastEntity = $this->model->getLastEntity($trafficEntity->getPK());
        $inKbitsSec = 0.0;
        $outKbitsSec = 0.0;
        // 이전 데이터가 있어야만 Rate 계산 가능
        if ($lastEntity !== null) {
            $lastTime = Time::parse($lastEntity->getCreatedAt())->getTimestamp();
            $deltaTime = Time::now()->getTimestamp() - $lastTime;

            if ($deltaTime > 0) {
                // DB에서 가져온 값도 BIGINT 타입으로 잘 처리되어야 합니다.
                // PHP 64비트 환경이라면 자동으로 64비트 정수로 가져옵니다.
                $lastIn = $lastEntity->getRawIn();
                $lastOut = $lastEntity->getRawOut();

                // 💡 1. IN/OUT바운드 Octets 차분 계산 64비트 카운터(BIGINT)를 사용하기 때문에 단순 뺄셈으로 처리합니다.
                $deltaInOctets = $currentInOctets - $lastIn;
                $deltaOutOctets = $currentOutOctets - $lastOut;

                // Kbit/s 계산: (Delta_Octets * 8 bits) / Delta_Time_Seconds / 1000 (-> Kbit/s) 실수(float) 연산으로 정확도를 높입니다.
                $inKbitsSec = ($deltaInOctets * 8.0) / $deltaTime / 1000.0;
                $outKbitsSec = ($deltaOutOctets * 8.0) / $deltaTime / 1000.0;
            } else {
                log_message('error', "시간 차이 오류 발생: {$trafficEntity->getIP()} - {$deltaTime}초 (UID: {$trafficEntity->getPK()})");
            }
        }
        return [
            'trafficinfo_uid' => (int)$trafficEntity->getPK(),
            'in'        => (int)$inKbitsSec, // 정수형으로 반환
            'out'       => (int)$outKbitsSec, // 정수형으로 반환
            'raw_in'    => (int)$currentInOctets,
            'raw_out'   => (int)$currentOutOctets,
        ];
    }
}