<?php
declare(strict_types=1);

namespace App\Service\Mailer;

use App\Entity\Message\ReportEmail;
use App\Enum\Core\EmailSendingTypeEnum;
use App\Enum\Message\MessageStatusEnum;
use App\Service\Mailer\Model\MailerModelInterface;
use App\Service\ServiceIterator\Mailer\BuilderIterator;
use App\Service\Utils\StringsUtils;
use App\Enum\Message\ReportMessageSatusEnum;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email as SymfonyEmail;

/**
 * Classe Mailer : Service assurant l'envoie d'un mail à un destinataire
 */
class Mailer
{
    public function __construct(
        private MailerInterface $symfonyMailer,
        private string $opentalentNoReplyEmailAddress,
        private BuilderIterator $builderIterator,
        private StringsUtils $stringsUtils,
        private EntityManagerInterface $entityManager
    )
    {
    }

    /**
     * Main fonction qui itère les différentes étapes nécessaires à l'envoie d'un email
     *  - Le Build
     *  - Le Send
     *  - Le Reporting
     *
     * @param MailerModelInterface $mailerModel
     * @throws \Exception
     */
    public function main(MailerModelInterface $mailerModel): void{
        $builderService = $this->builderIterator->getBuilderFor($mailerModel);
        $emailsCollection = $builderService->build($mailerModel);

        // @todo
        //$emailsCollection = $this->reduceEmailsCollectionInPreproduction($emailsCollection);

        foreach ($emailsCollection as $email){
            $this->send($email);

            $this->persistEmailEntity($email);
        }

        $this->report($emailsCollection);

        $this->entityManager->flush();
    }

    /**
     * Fonction d'envoie
     * @param EmailInterface $email
     */
    public function send(EmailInterface $email): void{
        //On créer le mail
        $symfonyMail = $this->createSymfonyEmail($email);

        $this->addRecipients($symfonyMail, $email);

        $this->addHeaders($symfonyMail, $email);

        // @todo
        //$this->addAttachments();

        //On tente d'envoyer
        try {
            $this->symfonyMailer->send($symfonyMail);
            $email->getEmailEntity()->setStatus(MessageStatusEnum::SEND()->getValue());
            $email->getEmailEntity()->setDateSent(new \DateTime('now'));
        } catch (\Exception $e) {
            $email->getEmailEntity()->setStatus(MessageStatusEnum::FAILED()->getValue());
        }
    }

    /**
     * Fonction de rapport
     * @param ArrayCollection $emails
     */
    public function report(ArrayCollection $emails): void{
        $delivered = [];
        $unDelivered = [];

        foreach ($emails as $email){
            $emailRecipients = $email->getEmailRecipients();
            /** @var EmailRecipient $emailRecipient */
            foreach ($emailRecipients as $emailRecipient){
                if($emailRecipient->getSendStatus() === ReportMessageSatusEnum::MISSING()->getValue()){
                    $unDelivered[] = $emailRecipient;
                }else if($emailRecipient->getSendStatus() === ReportMessageSatusEnum::DELIVERED()->getValue()){
                    $delivered[] = $emailRecipient;
                }
            }
        }

        $templatedMail = (new TemplatedEmail())
            ->from($this->opentalentNoReplyEmailAddress)
            ->subject(sprintf('Rapport d\'envoie du message : %s', $emails->first()->getEmailEntity()->getAbout()))
            ->htmlTemplate('@templates/emails/report.html.twig')
            ->context(
                [
                    'email_example' => $emails->first()->getEmailEntity(),
                    'delivered' => $delivered,
                    'unDelivered' => $unDelivered
                ]
            )
            ->addTo(new Address($this->opentalentNoReplyEmailAddress))
        ;

        try {
            $this->symfonyMailer->send($templatedMail);
        } catch (TransportExceptionInterface $e) {

        }
    }

    /**
     * Persist l'Email et les ReportEmail
     * @param Email $email
     */
    public function persistEmailEntity(Email $email){
        $emailEntity = $email->getEmailEntity();

        /** @var EmailRecipient $emailRecipient */
        foreach ($email->getEmailRecipients() as $emailRecipient){
            $report = (new ReportEmail())
                ->setAddressEmail($emailRecipient->getEmailAddress())
                ->setAccess($emailRecipient->getAccess())
                ->setOrganization($emailRecipient->getOrganization())
                ->setDateSend(new \DateTime('now'))
                ->setStatus($emailRecipient->getSendStatus())
            ;
            $emailEntity->addReport($report);
        }
        $this->entityManager->persist($emailEntity);
    }

    /**
     * Reduit le nombre d'emails a envoyer si on ne se trouve pas en prod
     * @param ArrayCollection $emailsCollection
     */
    public function reduceEmailsCollectionInPreproduction(ArrayCollection $emailsCollection): ArrayCollection {
        if($_ENV['env'] === 'prod') return $emailsCollection;

        $startEmails = $emailsCollection->slice(0, 10);
        $endEmails = $emailsCollection->slice($emailsCollection->count() - 11, 10);

        return new ArrayCollection([...$startEmails, ...$endEmails]);
    }

    /**
     * @param SymfonyEmail $symfonyMail
     * @param Email $email
     */
    public function addHeaders(SymfonyEmail $symfonyMail, Email $email){
       // $symfonyMail->getHeaders()->addTextHeader('List-Unsubscribe','mailto:'.$email->getOriginator().'?subject=désabonnement');

        $symfonyMail->getHeaders()->addTextHeader('X-ID-OT', $email->getEmailEntity()->getUniqueSendId());
    }


    /**
     * Création du Mail qui sera envoyé via le Mailer de Symfony
     * @param Email $email
     * @return SymfonyEmail
     */
    public function createSymfonyEmail(Email $email): SymfonyEmail{
        return (new SymfonyEmail())
            ->from($email->getFrom())
            ->subject($email->getEmailEntity()->getAbout())
            ->html($email->getContent())
            ->text($this->stringsUtils->convertHtmlToText($email->getContent()))
            ;
    }

    /**
     * On ajoute les destinataires suivant le type d'envoie souhaité
     * @param SymfonyEmail $symfonyMail
     * @param Address $addressesMail
     */
    public function addRecipients(SymfonyEmail $symfonyMail, Email $email): void{
        foreach ($email->getEmailRecipients() as $emailRecipient){
            $addressMail = new Address($emailRecipient->getEmailAddress(), $emailRecipient->getName());

            switch($emailRecipient->getSendType()){
                case EmailSendingTypeEnum::TO()->getValue():
                    $symfonyMail->addTo($addressMail);
                    break;
                case EmailSendingTypeEnum::BBC()->getValue():
                    $symfonyMail->addBcc($addressMail);
                    break;
                case EmailSendingTypeEnum::CC()->getValue():
                    $symfonyMail->addCc($addressMail);
                    break;
            }
        }
    }
}