<?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 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;
  }

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

  private function getCoverImage(array &$images, string $coverFileName): Image
  {
    $filtered = array_values(array_filter($images, function(Image $image) use ($coverFileName) {
      return $image->getPath() == $coverFileName;
    }));
    return array_pop($filtered);
  }

  private function getGalleryDate(string $dir): string
  {
    $timestamp = sprintf("@%s", filemtime($this->getImageDir($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
    ));
    $imagine = new Imagine();
    return array_map(function ($imagePath) use ($dir, $imagine) {
      $imageEntity = $this->em->getRepository(Image::class)->findOneBy([
        'dir' => $dir,
        'path' => $imagePath,
      ]);
      $this->ensureThumbnailExists($dir, $imagePath);
      if (null === $imageEntity) {
        $image = $imagine->open($this->getImageDir($dir) . $imagePath);
        $imageSize = $image->getSize();
        unset($image);

        $thumb = $imagine->open($this->getThumbDir($dir) . $imagePath);
        $thumbSize = $thumb->getSize();
        unset($thumb);

        $imageEntity =  new Image();
        $imageEntity->setLabel("")
          ->setDir($dir)
          ->setPath($imagePath)
          ->setWidth($imageSize->getWidth())
          ->setHeight($imageSize->getHeight())
          ->setThumbWidth($thumbSize->getWidth())
          ->setThumbHeight($thumbSize->getHeight())
        ;
        $this->em->persist($imageEntity);
        $this->em->flush();
      }
      return $imageEntity;
    }, $images);
  }

  private function ensureThumbnailExists(string $dir, string $imageName) {
    $imageDir = $this->getImageDir($dir);
    $thumbPath = $imageDir . "thumb_" . self::THUMBNAIL_SIZE;
    @mkdir($thumbPath);
    $thumbImageName = $thumbPath . "/" . $imageName;

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

    return $thumbImageName;
  }

  public function getImageFileName(string $slug, string $image, $isThumbnail = false): string
  {
    $config = $this->getConfig();
    $dir = $config['galleries'][$slug]['dir'];
    $this->ensureThumbnailExists($config['galleries'][$slug]['dir'], $image);
    return $isThumbnail
      ? ($this->getThumbDir($dir) . $image)
      : ($this->getImageDir($dir) . $image);
  }

  private function getImageDir($dir): string {
    return sprintf(self::IMAGE_BASEDIR, $dir);
  }

  private function getThumbDir($dir): string {
    return sprintf(self::IMAGE_BASEDIR, "{$dir}/thumb_" . self::THUMBNAIL_SIZE);
  }

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