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<?php

namespace Mautic\CampaignBundle\Executioner;

use Doctrine\Common\Collections\ArrayCollection;
use Mautic\CampaignBundle\Entity\Event;
use Mautic\CampaignBundle\Entity\EventRepository;
use Mautic\CampaignBundle\EventCollector\Accessor\Event\DecisionAccessor;
use Mautic\CampaignBundle\EventCollector\EventCollector;
use Mautic\CampaignBundle\Executioner\Event\DecisionExecutioner as Executioner;
use Mautic\CampaignBundle\Executioner\Exception\CampaignNotExecutableException;
use Mautic\CampaignBundle\Executioner\Exception\DecisionNotApplicableException;
use Mautic\CampaignBundle\Executioner\Helper\DecisionHelper;
use Mautic\CampaignBundle\Executioner\Result\Responses;
use Mautic\CampaignBundle\Executioner\Scheduler\EventScheduler;
use Mautic\CampaignBundle\Helper\ChannelExtractor;
use Mautic\LeadBundle\Entity\Lead;
use Mautic\LeadBundle\Model\LeadModel;
use Mautic\LeadBundle\Tracker\ContactTracker;
use Psr\Log\LoggerInterface;

class RealTimeExecutioner
{
    /**
     * @var Lead
     */
    private $contact;

    /**
     * @var array
     */
    private $events;

    private ?Responses $responses = null;

    public function __construct(
        private LoggerInterface $logger,
        private LeadModel $leadModel,
        private EventRepository $eventRepository,
        private EventExecutioner $executioner,
        private Executioner $decisionExecutioner,
        private EventCollector $collector,
        private EventScheduler $scheduler,
        private ContactTracker $contactTracker,
        private DecisionHelper $decisionHelper
    ) {
    }

    /**
     * @param string      $type
     * @param mixed       $passthrough
     * @param string|null $channel
     * @param int|null    $channelId
     *
     * @return Responses
     *
     * @throws Dispatcher\Exception\LogNotProcessedException
     * @throws Dispatcher\Exception\LogPassedAndFailedException
     * @throws Exception\CannotProcessEventException
     * @throws Scheduler\Exception\NotSchedulableException
     */
    public function execute($type, $passthrough = null, $channel = null, $channelId = null)
    {
        $this->responses = new Responses();
        $now             = new \DateTime();

        $this->logger->debug('CAMPAIGN: Campaign triggered for event type '.$type.'('.$channel.' / '.$channelId.')');

        // Kept for BC support although not sure we need this
        defined('MAUTIC_CAMPAIGN_NOT_SYSTEM_TRIGGERED') or define('MAUTIC_CAMPAIGN_NOT_SYSTEM_TRIGGERED', 1);

        try {
            $this->fetchCurrentContact();
        } catch (CampaignNotExecutableException $exception) {
            $this->logger->debug('CAMPAIGN: '.$exception->getMessage());

            return $this->responses;
        }

        try {
            $this->fetchCampaignData($type);
        } catch (CampaignNotExecutableException $exception) {
            $this->logger->debug('CAMPAIGN: '.$exception->getMessage());

            return $this->responses;
        }

        /** @var Event $event */
        foreach ($this->events as $event) {
            try {
                $this->evaluateDecisionForContact($event, $passthrough, $channel, $channelId);
            } catch (DecisionNotApplicableException $exception) {
                $this->logger->debug('CAMPAIGN: Event ID '.$event->getId().' is not applicable ('.$exception->getMessage().')');

                continue;
            }

            $children = $event->getPositiveChildren();
            if (!$children->count()) {
                $this->logger->debug('CAMPAIGN: Event ID '.$event->getId().' has no positive children');

                continue;
            }

            $this->executeAssociatedEvents($children, $now);
        }

        // Save any changes to the contact done by the listeners
        if ($this->contact->getChanges()) {
            $this->leadModel->saveEntity($this->contact, false);
        }

        return $this->responses;
    }

    /**
     * @throws Dispatcher\Exception\LogNotProcessedException
     * @throws Dispatcher\Exception\LogPassedAndFailedException
     * @throws Exception\CannotProcessEventException
     * @throws Scheduler\Exception\NotSchedulableException
     */
    private function executeAssociatedEvents(ArrayCollection $children, \DateTime $now): void
    {
        $children = clone $children;

        /** @var Event $child */
        foreach ($children as $key => $child) {
            $executionDate = $this->scheduler->getExecutionDateTime($child, $now);
            $this->logger->debug(
                'CAMPAIGN: Event ID# '.$child->getId().
                ' to be executed on '.$executionDate->format('Y-m-d H:i:s e')
            );

            if ($this->scheduler->shouldSchedule($executionDate, $now)) {
                $this->scheduler->scheduleForContact($child, $executionDate, $this->contact);

                $children->remove($key);
            }
        }

        if ($children->count()) {
            $this->executioner->executeEventsForContact($children, $this->contact, $this->responses);
        }
    }

    /**
     * @param mixed       $passthrough
     * @param string|null $channel
     * @param int|null    $channelId
     *
     * @throws DecisionNotApplicableException
     * @throws Exception\CannotProcessEventException
     */
    private function evaluateDecisionForContact(Event $event, $passthrough = null, $channel = null, $channelId = null): void
    {
        $this->logger->debug('CAMPAIGN: Executing '.$event->getType().' ID '.$event->getId().' for contact ID '.$this->contact->getId());

        $this->decisionHelper->checkIsDecisionApplicableForContact($event, $this->contact, $channel, $channelId);

        /** @var DecisionAccessor $config */
        $config = $this->collector->getEventConfig($event);
        $this->decisionExecutioner->evaluateForContact($config, $event, $this->contact, $passthrough, $channel, $channelId);
    }

    /**
     * @throws CampaignNotExecutableException
     */
    private function fetchCurrentContact(): void
    {
        $this->contact = $this->contactTracker->getContact();
        if (!$this->contact instanceof Lead || !$this->contact->getId()) {
            throw new CampaignNotExecutableException('Unidentifiable contact');
        }

        $this->logger->debug('CAMPAIGN: Current contact ID# '.$this->contact->getId());
    }

    /**
     * @throws CampaignNotExecutableException
     */
    private function fetchCampaignData($type): void
    {
        if (!$this->events = $this->eventRepository->getContactPendingEvents($this->contact->getId(), $type)) {
            throw new CampaignNotExecutableException('Contact does not have any applicable '.$type.' associations.');
        }

        // 2.14 BC break workaround - pre 2.14 had a bug that recorded channelId for decisions as 1 regardless of actually ID
        // if channelIdField was an array and only one item was selected. That caused the channel ID check in evaluateDecisionForContact
        // to fail resulting in the decision never being evaluated. Therefore we are going to self heal these decisions.
        /** @var Event $event */
        foreach ($this->events as $event) {
            if (1 === $event->getChannelId()) {
                ChannelExtractor::setChannel($event, $event, $this->collector->getEventConfig($event));

                $this->eventRepository->saveEntity($event);
            }
        }

        $this->logger->debug('CAMPAIGN: Found '.count($this->events).' events to analyze for contact ID '.$this->contact->getId());
    }
}