<?php

namespace App\Service\Pdf;

use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Process\Process;

class Sanitizer
{
    public function __construct(
        private readonly string $binGs,
        private readonly string $binConvert,
        private readonly string $tempDir,
    ) {
    }

    /**
     * @throws \InvalidArgumentException
     */
    public function sanitizeFile(string $inputFilepath, ?string $targetFilepath = null, bool $backup = true): string
    {
        $filesystem = new Filesystem();

        if (true === $backup) {
            $parts = pathinfo($inputFilepath);
            $backupFilename = sprintf('%s/%s.orig.%s', $parts['dirname'], $parts['filename'], $parts['extension']);
            $filesystem->copy($inputFilepath, $backupFilename);
        }

        $tempFilename = sha1($inputFilepath);
        $outputFilepath = $this->tempDir.'/'.$tempFilename;
        $pdfFilepath = null;

        if (null === $targetFilepath) {
            $targetFilepath = $inputFilepath.'.pdf';
        }

        if ('pdf' !== pathinfo($inputFilepath, PATHINFO_EXTENSION)) {
            $pdfFilepath = $outputFilepath.'.pdf';

            $command = [
                $this->binConvert,
                $inputFilepath,
                $pdfFilepath,
            ];

            $process = new Process($command);
            $process->run();

            if (false === $process->isSuccessful()) {
                throw new \InvalidArgumentException('File could not be sanitized: '.$process->getErrorOutput());
            }

            $inputFilepath = $pdfFilepath;
        }

        $command = [
            $this->binGs,
            '-dNOPAUSE',
            '-dQUIET',
            '-dBATCH',
            '-dPreserveAnnots=false',
            '-sDEVICE=pdfwrite',
            '-dCompatibilityLevel=1.4',
            '-sOutputFile='.$outputFilepath,
            '-f',
            $inputFilepath,
        ];

        $process = new Process($command);
        $process->run();

        if (false === $process->isSuccessful()) {
            throw new \InvalidArgumentException('File could not be sanitized: '.$process->getErrorOutput());
        }

        $filesystem->rename($outputFilepath, $targetFilepath, true);

        if (null !== $pdfFilepath) {
            $filesystem->remove($pdfFilepath);
        }

        return $targetFilepath;
    }
}