<?php

namespace LDMR\FormBundle\Service;


use Doctrine\ORM\EntityManager;
use LDMR\FormBundle\Entity\Form;
use LDMR\FormBundle\Entity\LuluForm;
use LDMR\FormBundle\Repository\FormQuestionRepository;
use LDMR\FormBundle\Repository\LuluFormRepository;
use LDMR\LuluBundle\Entity\Lulu;
use Symfony\Component\Templating\EngineInterface as TemplatingEngine;
use Symfony\Component\Filesystem\Filesystem;
use Knp\Bundle\GaufretteBundle\FilesystemMap;
use Knp\Snappy\GeneratorInterface as PdfGenerator;
use \LogicException;
use \Exception;
use Doctrine\ORM\NonUniqueResultException;
use Doctrine\ORM\OptimisticLockException;



/**
 * Class FormPdf
 * @package LDMR\FormBundle\Service;
 */
class FormPdf
{
    /** @var TemplatingEngine **/
    private $templatingEngine;

    /** @var FilesystemMap **/
    private $filesystemMap;

    /** @var EntityManager **/
    private $em;

    /** @var PdfGenerator **/
    private $pdfGenerator;

    /** @var FormQuestionRepository **/
    private $repoQuestion;

    /** @var LuluFormRepository **/
    private $repoLuluForm;

    /** @var string **/
    private $kernelEnv;

    /** @var string **/
    private $envSubDir;

    public function __construct(EntityManager $em, TemplatingEngine $templatingEngine, PdfGenerator $pdfGenerator, FilesystemMap $filesystemMap, string $kernelEnv, string $envSubDir) {
        $this->em               = $em;
        $this->repoLuluForm     = $this->em->getRepository('LDMRFormBundle:LuluForm');
        $this->repoQuestion     = $this->em->getRepository('LDMRFormBundle:FormQuestion');
        $this->pdfGenerator     = $pdfGenerator;
        $this->templatingEngine = $templatingEngine;
        $this->filesystemMap    = $filesystemMap;
        $this->kernelEnv        = $kernelEnv;
        $this->envSubDir        = $envSubDir;
    }


    /**
     * @param Lulu $lulu
     * @param Form $form
     *
     * @return string
     *
     * @throws NonUniqueResultException
     * @throws OptimisticLockException
     * @throws Exception
     */
    public function generateFormPdf (Lulu $lulu, Form $form)
    {
        /** @var LuluForm $luluForm */
        /*$luluForm = $this->repoLuluForm->findOneObjectBy(['form' => $form, 'lulu' => $lulu], ['followupEmployee']);

        if (null === $luluForm){
            throw new LogicException(sprintf("Lulu '%s' does not have answered Form '%s'.", $lulu->getId(), $form->getName()));
        }*/

        $formResponse = $this->repoLuluForm->getFormattedLuluFormAnswers($form->getUniqueId(), $lulu->getId());

        $luluFormPath        = $this->envSubDir . '/form/'.$form->getUniqueId().'_'.$lulu->getId().'.pdf';
        $luluFormPathTmpPath = $this->getFormattedOutputFilePath('/tmp/' . $luluFormPath);
        $fs = new Filesystem();

        try {
            $templateHtml = $this->templatingEngine->render(
                '::Pdf/Form/lulu_form.html.twig',
                [
                    'user'         => $lulu->getUser(),
                    'lulu'         => $lulu,
                    'formResponse' => $formResponse
                ]
            );

            $this->pdfGenerator->generateFromHtml(
                $templateHtml,
                $luluFormPathTmpPath,
                ['encoding' => 'utf-8'],
                true
            );
        }
        catch (Exception $exception) {
            $fs->remove($luluFormPathTmpPath);
            throw new Exception($exception->getMessage());
        }

        $bucket  = $this->filesystemMap->get('storage');
        $bucket->write($luluFormPath, file_get_contents($luluFormPathTmpPath), true);

        $fs->remove($luluFormPathTmpPath);

        $luluForm->setPdfUrl($luluFormPath);
        $this->repoLuluForm->flush();
        $this->em->detach($formResponse);

        return $luluFormPath;
    }

    /**
     * format output file path for windows
     *
     * @param string $file
     *
     * @return string
     */
    protected function getFormattedOutputFilePath(string $file)
    {
        if (0 === strpos(PHP_OS, 'WIN')) {
            $file = str_replace('\\', '/', sys_get_temp_dir()).str_replace('/tmp', '', $file);
        }

        return $file;
    }
}