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<?php

namespace Mautic\CampaignBundle\Executioner;

use Mautic\CampaignBundle\Entity\Campaign;
use Mautic\CampaignBundle\Entity\Event;
use Mautic\CampaignBundle\Executioner\ContactFinder\KickoffContactFinder;
use Mautic\CampaignBundle\Executioner\ContactFinder\Limiter\ContactLimiter;
use Mautic\CampaignBundle\Executioner\Exception\NoContactsFoundException;
use Mautic\CampaignBundle\Executioner\Exception\NoEventsFoundException;
use Mautic\CampaignBundle\Executioner\Result\Counter;
use Mautic\CampaignBundle\Executioner\Scheduler\EventScheduler;
use Mautic\CampaignBundle\Executioner\Scheduler\Exception\NotSchedulableException;
use Mautic\CoreBundle\Helper\ProgressBarHelper;
use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Output\NullOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Contracts\Translation\TranslatorInterface;

class KickoffExecutioner implements ExecutionerInterface
{
    private ?ContactLimiter $limiter = null;

    private ?Campaign $campaign = null;

    private ?OutputInterface $output = null;

    private ?\Symfony\Component\Console\Helper\ProgressBar $progressBar = null;

    private ?\Doctrine\Common\Collections\ArrayCollection $rootEvents = null;

    private ?Counter $counter = null;

    public function __construct(
        private LoggerInterface $logger,
        private KickoffContactFinder $kickoffContactFinder,
        private TranslatorInterface $translator,
        private EventExecutioner $executioner,
        private EventScheduler $scheduler
    ) {
    }

    /**
     * @return Counter
     *
     * @throws Dispatcher\Exception\LogNotProcessedException
     * @throws Dispatcher\Exception\LogPassedAndFailedException
     * @throws Exception\CannotProcessEventException
     * @throws NotSchedulableException
     */
    public function execute(Campaign $campaign, ContactLimiter $limiter, OutputInterface $output = null)
    {
        $this->campaign = $campaign;
        $this->limiter  = $limiter;
        $this->output   = $output ?: new NullOutput();
        $this->counter  = new Counter();

        try {
            $this->prepareForExecution();
            $this->executeOrScheduleEvent();
        } catch (NoContactsFoundException) {
            $this->logger->debug('CAMPAIGN: No more contacts to process');
        } catch (NoEventsFoundException) {
            $this->logger->debug('CAMPAIGN: No events to process');
        } finally {
            if ($this->progressBar) {
                $this->progressBar->finish();
            }
            $this->executioner->persistSummaries();
        }

        return $this->counter;
    }

    /**
     * @throws NoEventsFoundException
     */
    private function prepareForExecution(): void
    {
        $this->logger->debug('CAMPAIGN: Triggering kickoff events');

        $this->rootEvents = $this->campaign->getRootEvents();
        $totalRootEvents  = $this->rootEvents->count();
        if (!$totalRootEvents) {
            throw new NoEventsFoundException();
        }
        $this->logger->debug('CAMPAIGN: Processing the following events: '.implode(', ', $this->rootEvents->getKeys()));
        $totalKickoffEvents = 0;
        if (!($this->output instanceof NullOutput)) {
            $totalContacts      = $this->kickoffContactFinder->getContactCount($this->campaign->getId(), $this->rootEvents->getKeys(), $this->limiter);
            $totalKickoffEvents = $totalRootEvents * $totalContacts;

            $this->output->writeln(
                $this->translator->trans(
                    'mautic.campaign.trigger.event_count',
                    [
                        '%events%' => $totalKickoffEvents,
                        '%batch%'  => $this->limiter->getBatchLimit(),
                    ]
                )
            );

            if (!$totalKickoffEvents) {
                throw new NoEventsFoundException();
            }
        }

        $this->progressBar = ProgressBarHelper::init($this->output, $totalKickoffEvents);
        $this->progressBar->start();
    }

    /**
     * @throws Dispatcher\Exception\LogNotProcessedException
     * @throws Dispatcher\Exception\LogPassedAndFailedException
     * @throws Exception\CannotProcessEventException
     * @throws NoContactsFoundException
     * @throws NotSchedulableException
     */
    private function executeOrScheduleEvent(): void
    {
        // Use the same timestamp across all contacts processed
        $now = new \DateTime();
        $this->counter->advanceEventCount($this->rootEvents->count());

        // Loop over contacts until the entire campaign is executed
        $contacts = $this->kickoffContactFinder->getContacts($this->campaign->getId(), $this->limiter);
        while ($contacts && $contacts->count()) {
            $batchMinContactId = max($contacts->getKeys()) + 1;
            $rootEvents        = clone $this->rootEvents;

            /** @var Event $event */
            foreach ($rootEvents as $key => $event) {
                $this->progressBar->advance($contacts->count());
                $this->counter->advanceEvaluated($contacts->count());

                try {
                    // Get the date the event would be executed on as if it was based on days only
                    $executionDate = $this->scheduler->getExecutionDateTime($event, $now);
                    $this->logger->debug(
                        'CAMPAIGN: Event ID# '.$event->getId().
                        ' to be executed on '.$executionDate->format('Y-m-d H:i:s e').
                        ' compared to '.$now->format('Y-m-d H:i:s e')
                    );

                    // Adjust the hour based on contact timezone if applicable
                    $this->scheduler->validateAndScheduleEventForContacts($event, $executionDate, $contacts, $now);

                    $this->counter->advanceTotalScheduled($contacts->count());
                    $rootEvents->remove($key);

                    continue;
                } catch (NotSchedulableException) {
                    // Execute the event
                }
            }

            if ($rootEvents->count()) {
                // Execute the events for the batch of contacts
                $this->executioner->executeEventsForContacts($rootEvents, $contacts, $this->counter);
            }

            $this->kickoffContactFinder->clear($contacts);

            if ($this->limiter->getContactId()) {
                // No use making another call
                break;
            }

            $this->logger->debug('CAMPAIGN: Fetching the next batch of kickoff contacts starting with contact ID '.$batchMinContactId);
            $this->limiter->setBatchMinContactId($batchMinContactId);

            // Get the next batch
            $contacts = $this->kickoffContactFinder->getContacts($this->campaign->getId(), $this->limiter);
        }
    }
}