<?php
namespace Vichan\Service\Media;

use Vichan\Data\ThumbGenerationResult;
use Vichan\Functions\Fs;
use Mimey\MimeTypes;


class FallbackMediaHandler implements MediaHandler {
	private string $path;
	private int $width;
	private int $height;
	private string $mime;
	private MimeTypes $mime_types;


	public function __construct(ImageMetadataReader $image_metadate_reader, string $default_thumb_path, MimeTypes $mime_types) {
		$res = $image_metadate_reader->getMetadata($default_thumb_path);
		$this->path = $default_thumb_path;
		$this->width = $res->width;
		$this->height = $res->height;
		$this->mime = $res->mime;
		$this->mime_types = $mime_types;
	}

	public function supportsMime(string $mime): bool {
		return true;
	}

	public function openHandle(string $file_path, string $file_mime, int $file_kind): mixed {
		return [ $file_path, $file_kind ];
	}

	public function closeHandle(mixed $handle) {
		// No-op
	}

	public function installMediaAndGenerateThumb(
		mixed $handle,
		string $media_preferred_out_file_path,
		string $thumb_preferred_out_file_path,
		string $thumb_preferred_out_mime,
		int $thumb_max_width,
		int $thumb_max_height
	) {
		list($source_file_path, $source_file_kind) = $handle;

		if ($source_file_kind === self::FILE_KIND_UPLOADED) {
			if (!Fs\move_or_copy_uploaded($source_file_path, $media_preferred_out_file_path)) {
				throw new \RuntimeException("Could not move or copy uploaded file '$source_file_path' to '$media_preferred_out_file_path'");
			}
		} else {
			if (!Fs\link_or_copy($source_file_path, $media_preferred_out_file_path)) {
				throw new \RuntimeException("Could not link or copy '$source_file_path' to '$media_preferred_out_file_path'");
			}
		}

		return $this->generateThumb(
			$handle,
			$thumb_preferred_out_file_path,
			$thumb_preferred_out_mime,
			$thumb_max_width,
			$thumb_max_height
		);
	}

	public function generateThumb(
		mixed $handle,
		string $preferred_out_file_path,
		string $preferred_out_mime,
		int $max_width,
		int $max_height
	): ThumbGenerationResult {
		return new ThumbGenerationResult(
			$this->path,
			$this->mime,
			false,
			\min($this->width, $max_width),
			\min($this->height, $max_height)
		);
	}
}