<?php
namespace Vichan\Service\Media;

use Vichan\Data\Driver\ExifReaderFactory;
use Vichan\Data\ImageMetadataResult;


/**
 * Do not use this if you can.
 *
 * Some formats may contain no image or may contain multiple images. In these cases, getimagesize() might not be
 * able to properly determine the image size. getimagesize() will return zero for width and height in these cases.
 *
 * The implementation only supports a limited subset of metadata for only the provided exif image formats readers.
 * It won't always be able to correct the orientation, but it will try.
 */
class DefaultImageMetadataReader implements ImageMetadataReader {
	private ExifReaderFactory $exif_reader_factory;

	public function __construct(ExifReaderFactory $exif_reader_factory) {
		$this->exif_reader_factory = $exif_reader_factory;
	}

	public function getMetadata(string $file_path): ImageMetadataResult {
		$ret = \getimagesize($file_path, $info);
		if ($ret === false) {
			throw new \RuntimeException("Could not read image sizes of '$file_path'");
		}
		if ($ret[2] == \IMAGETYPE_UNKNOWN) {
			throw new \RuntimeException("Error '$file_path' is not an image");
		}
		$exif_reader = $this->exif_reader_factory->getReader($ret['mime']);
		$orientation = $exif_reader === null ? null : $exif_reader->getOrientation($file_path);

		return new ImageMetadataResult($ret[0], $ret[1], $ret['mime'], $orientation);
	}
}