<?php


namespace App\Service;


use App\Entity\Image;
use Doctrine\ORM\EntityManager;
use Imagine\Gd\Imagine;
use Imagine\Image\Box;
use Imagine\Image\ImageInterface;
use Symfony\Component\Yaml\Parser;
use Zend\Config\Reader\Yaml;

class GalleryService
{

  const CONFIG_FILE = 'data/galleries/config.yaml';
  const IMAGE_BASEDIR = 'data/galleries/%s/';
  const THUMBNAIL_SIZE = 500;

  protected $contentTypeMap = [
    'jpg'  => 'image/jpeg',
    'jpeg' => 'image/jpeg',
    'png'  => 'image/png',
  ];
  protected $config;

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

  public function __construct(EntityManager $entityManager)
  {
    $this->em = $entityManager;
  }

  public function loadGalleryData($includeHidden = false)
  {
    $config = $this->getConfig();
    $albums = [];
    foreach ($config['galleries'] as $id => $data) {
      if ($includeHidden || $data['public']) {
        $albums[] = [
          'slug' => $id,
          'name' => $data['name'],
          'coverImage' => isset($data['cover'])
            ? $this->getCoverImage($data['cover'])
            : null,
          'date' => $this->getGalleryDate($data['dir']),
          'type' => $data['type'],
          'isNew' => $data['new'],
          'isPublic' => $data['public'],
          'images' => $this->loadGalleryImages($data['dir']),
        ];
      }
    }
    return $albums;
  }

  private function getGalleryDate(string $dir): string
  {
    $timestamp = sprintf("@%s", filemtime(sprintf(self::IMAGE_BASEDIR, $dir)));
    $date = new \DateTime($timestamp);
    return $date->format("Y-m-d");
  }

  /**
   * @param string $dir
   * @return Image[]
   * @todo implement label for image in some way
   */
  private function loadGalleryImages(string $dir): array
  {
    $images = array_map('basename', glob(
      sprintf(self::IMAGE_BASEDIR . "*.{jpg,jpeg,png}", $dir),
      GLOB_BRACE
    ));
    $imagine = new Imagine();
    return array_map(function ($image) use ($dir, $imagine) {
      $imageEntity = $this->em->getRepository(Image::class)->findOneBy([
        'dir' => $dir,
        'path' => $image,
      ]);
      if (null === $imageEntity) {
        $imageEntity =  new Image();
        $imageEntity->setLabel("")
          ->setDir($dir)
          ->setPath($image);
        $this->processImageSizes($dir, $imageEntity, $imagine);
        $this->em->persist($imageEntity);
        $this->em->flush();
      }
      return $imageEntity;
    }, $images);
  }

  private function processImageSizes(string $dir, Image $image, Imagine $imagine)
  {
    $img = $imagine->open(sprintf(self::IMAGE_BASEDIR, $dir) . $image->getPath());
    $imgSize = $img->getSize();
    $image->setWidth($imgSize->getWidth())
      ->setHeight($imgSize->getHeight());
  }

  /**
   * @param string $image
   * @return Image
   */
  private function getCoverImage(string $image): Image
  {
    $img = new Image();
    return $img->setLabel("")
      ->setPath($image)
      ->setWidth(0)
      ->setHeight(0);
  }

  public function getImage(string $slug, string $image, $size = false): string
  {
    $config = $this->getConfig();
    $galleryDir = sprintf(self::IMAGE_BASEDIR, $config['galleries'][$slug]['dir']);
    $imageFileName = $size
      ? $this->getResizedImageName($galleryDir, $image, $size)
      : ($galleryDir . $image);

    return $imageFileName;
  }

  public function exportGallery(string $slug)
  {
    $config = $this->getConfig();

    if (!isset($config['galleries'][$slug])) {
      return false;
    }

    $dir = $config['galleries'][$slug]['dir'];
    $images = array_map('basename', glob(sprintf(self::IMAGE_BASEDIR . "*.{jpg,jpeg,png}", $dir), GLOB_BRACE));

    $zipName = tempnam("data/tmp", "export");
    $zipArchive = new \ZipArchive();
    $zipArchive->open($zipName, \ZipArchive::CREATE);
    foreach ($images as $image) {
      $zipArchive->addFile("{$dir}/{$image}");
    }
    $zipArchive->close();
    return $zipName;
  }

  protected function getResizedImageName($galleryDirectory, $imageName, $size): string
  {
    $numericSize = $size == 'thumb' ? self::THUMBNAIL_SIZE : $size;

    $thumbPath = $galleryDirectory . "thumb_" . $numericSize;
    @mkdir($thumbPath);
    $thumbImageName = $thumbPath . "/" . $imageName;

    if (!file_exists($thumbImageName)) {
      $thumbSize = new Box($numericSize, $numericSize*10);
      $imagine = new Imagine();
      $image = $imagine->open($galleryDirectory . $imageName)
        ->thumbnail($thumbSize, ImageInterface::THUMBNAIL_INSET);
      $image->effects()->sharpen();
      $image->save($thumbImageName);
    }

    return $thumbImageName;
  }

  protected function getConfig()
  {
    if (null === $this->config) {
      $parser = new Parser();
      $configReader = new Yaml([$parser, 'parse']);
      $this->config = $configReader->fromFile(self::CONFIG_FILE);
    }
    return $this->config;
  }
}