<?php

namespace App\Service;

use PhpImap\IncomingMail;
use PhpImap\IncomingMailAttachment;
use Psr\Log\LoggerInterface;
use SecIT\ImapBundle\Connection\ConnectionInterface;
use Symfony\Component\DependencyInjection\Attribute\Target;
use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Filesystem\Path;
use App\Presentation\PortfolioPresenter as PresentationPortfolio;
use App\Service\TelegramNotifier;

readonly class MailFetcher
{
    public function __construct(
        #[Target('finfollowConnection')]
        private ConnectionInterface $connection,
        private XmlParser           $xmlParser,
        private PortfolioManager    $portfolioManager,
        private LoggerInterface     $logger,
        private TelegramNotifier    $telegramNotifier,
    )
    {
    }

    public function fetchNewEmails(): void
    {
        $mailbox = $this->connection->getMailbox();
        try {
            // Get all emails (messages)
            // PHP.net imap_search criteria: http://php.net/manual/en/function.imap-search.php
            $mailsIds = $mailbox->searchMailbox('ALL');
        } catch (PhpImap\Exceptions\ConnectionException $ex) {
            $this->logger->error("IMAP connection failed: " . implode(",", $ex->getErrors('all')));
            die();
        }

        if (!$mailsIds) {
            $this->logger->info('Mailbox is empty');

            return;
        }

        // If '__DIR__' was defined in the first line, it will automatically
        // save all attachments to the specified directory

        foreach ($mailsIds as $mailId) {
            $mail = $mailbox->getMail($mailId);

            $this->logger->debug(print_r([
                'date' => $mail->date,
                'message_id' => $mail->messageId,
                'from' => $mail->fromAddress,
                'subject' => $mail->subject,
                'hasAttachments' => $mail->hasAttachments(),
            ], true));

            if ($this->canProcessMail($mail)) {
                if ($this->processMail($mail)) {
                    // for dev purposes
                    //break;
                }

                $mailbox->deleteMail($mailId);
                $this->logger->debug("Deleted email with id=" . $mailId);
            } else {
                $this->logger->debug("Skipped mail with id=" . $mailId);
            }
        }

        $mailbox->disconnect();
    }

    private function canProcessMail(IncomingMail $mail): bool
    {
        if (!$mail->hasAttachments()) {
            return false;
        }

        if (mb_stripos($mail->subject, 'Broker report') === false) {
            return false;
        }

        if (mb_stripos($mail->fromAddress, '@bcs.ru') === false) {
            return false;
        }

        return true;
    }

    private function processMail(IncomingMail $mail): bool
    {
        $mailProcessed = false;

        foreach ($mail->getAttachments() as $attachment) {
            if ($attachment->mimeType != 'application/zip') {
                continue;
            }

            $mailProcessed |= $this->processZipArchiveAttachment($attachment);
        }

        return $mailProcessed;
    }

    private function processZipArchiveAttachment(IncomingMailAttachment $attachment): bool
    {
        $zip = new \ZipArchive();
        if ($zip->open($attachment->filePath) !== true) {
            $this->logger->error('ZIP open error: ' . $zip);
            return false;
        }

        $xmlFound = false;
        for ($i = 0; $i < $zip->numFiles; $i++) {
            $stat = $zip->statIndex($i);

            if (pathinfo($stat['name'])['extension'] !== 'xml') {
                continue;
            }

            $tmpdir = $this->getTmpDir();

            $zip->extractTo($tmpdir, [$stat['name']]);
            $this->logger->debug("Extracted '$stat[name]' into '$tmpdir'");

            $xmlString = file_get_contents($tmpdir . '/' . $stat['name']);
            $xml = simplexml_load_string($xmlString);

            $parsedPortfolio = $this->xmlParser->processXml($xml);
            $message = (new PresentationPortfolio)->toPrint($parsedPortfolio);

            if ($this->portfolioManager->updatePortfolio($parsedPortfolio, $xmlString)) {
                $this->telegramNotifier->notify('<pre>' . $message . '</pre>');
            }

            $fs = new Filesystem();
            $fs->remove($tmpdir);

            $xmlFound = true;
        }

        return $xmlFound;
    }

    private function getTmpDir(): string
    {
        $tmpdir = Path::normalize(sys_get_temp_dir() . '/FINFOLLOW-' . random_int(0, 100));

        $filesystem = new Filesystem();
        $filesystem->mkdir($tmpdir);

        return $tmpdir;
    }

}