<?php

namespace App\ImagineBundle\Binary\Loader;

use League\Flysystem\Filesystem;
use Liip\ImagineBundle\Exception\Binary\Loader\NotLoadableException;
use Liip\ImagineBundle\Exception\InvalidArgumentException;
use Liip\ImagineBundle\Model\Binary;
use Liip\ImagineBundle\Binary\Loader\LoaderInterface;
use Liip\ImagineBundle\Binary\BinaryInterface;
use Symfony\Component\HttpFoundation\File\MimeType\ExtensionGuesserInterface as DeprecatedExtensionGuesserInterface;
use Symfony\Component\Mime\MimeTypesInterface;

class FlysystemLoader implements LoaderInterface
{
    /**
     * @var Filesystem
     */
    protected $filesystem;

    /**
     * @var MimeTypesInterface|DeprecatedExtensionGuesserInterface
     */
    protected $extensionGuesser;

    /**
     */
    public function __construct(MimeTypesInterface $extensionGuesser, Filesystem $filesystem)
    {
        if (!$extensionGuesser instanceof MimeTypesInterface && !$extensionGuesser instanceof DeprecatedExtensionGuesserInterface) {
            throw new InvalidArgumentException('$extensionGuesser must be an instance of Symfony\Component\Mime\MimeTypesInterface or Symfony\Component\HttpFoundation\File\MimeType\ExtensionGuesserInterface');
        }

        if (interface_exists(MimeTypesInterface::class) && $extensionGuesser instanceof DeprecatedExtensionGuesserInterface) {
            @trigger_error(sprintf('Passing a %s to "%s()" is deprecated since Symfony 4.3, pass a "%s" instead.', DeprecatedExtensionGuesserInterface::class, __METHOD__, MimeTypesInterface::class), E_USER_DEPRECATED);
        }

        $this->extensionGuesser = $extensionGuesser;
        $this->filesystem       = $filesystem;
    }

    /**
     * {@inheritdoc}
     */
    public function find($path)
    {
        if (false === $this->filesystem->fileExists($path)) {
            throw new NotLoadableException(sprintf('Source image "%s" not found.', $path));
        }

        $mimeType = $this->filesystem->mimetype($path);

        $extension = $this->getExtension($mimeType);

        return new Binary(
            $this->filesystem->read($path),
            $mimeType,
            $extension
        );
    }

    private function getExtension(?string $mimeType): ?string
    {
        if ($this->extensionGuesser instanceof DeprecatedExtensionGuesserInterface) {
            return $this->extensionGuesser->guess($mimeType);
        }

        if (null === $mimeType) {
            return null;
        }

        return $this->extensionGuesser->getExtensions($mimeType)[0] ?? null;
    }
}

# config/services.yaml
# ...
    App\ImagineBundle\Binary\Loader\FlysystemLoader:
        arguments: ['@mime_types', '@League\Flysystem\Filesystem']
        tags:
            - { name: 'liip_imagine.binary.loader', loader: flysystemV2 }