<?php
/**
 * ImageService.php
 *
 * @copyright  2022 opencart.cn - All Rights Reserved
 * @link       http://www.guangdawangluo.com
 * @author     Edward Yang <yangjin@opencart.cn>
 * @created    2022-07-12 17:30:20
 * @modified   2022-07-12 17:30:20
 */

namespace Beike\Services;

use Intervention\Image\Facades\Image;

class ImageService
{
    private $image;
    private $imagePath;

    /**
     * @param string $image
     * @throws \Exception
     */
    public function __construct(string $image)
    {
        $this->image = $image;
        $imagePath = public_path($image);
        if (!file_exists($imagePath)) {
            throw new \Exception("图片不存在");
        }
        $this->imagePath = $imagePath;
    }


    /**
     * 生成并获取缩略图
     * @param int $width
     * @param int $height
     * @return string
     */
    public function resize(int $width = 100, int $height = 100): string
    {
        $extension = pathinfo($this->imagePath, PATHINFO_EXTENSION);
        $newImage = 'cache/' . mb_substr($this->image, 0, mb_strrpos($this->image, '.')) . '-' . (int)$width . 'x' . (int)$height . '.' . $extension;

        $newImagePath = public_path($newImage);
        if (!is_file($newImagePath) || (filemtime($this->imagePath) > filemtime($newImagePath))) {
            $this->createDirectories($newImage);
            $img = Image::make($this->imagePath);
            $img->resize($width, $height);
            $img->save($newImagePath);
        }
        return asset($newImage);
    }


    /**
     * 递归创建缓存文件夹
     *
     * @param $imagePath
     */
    private function createDirectories($imagePath)
    {
        $path = '';
        $directories = explode('/', dirname($imagePath));
        foreach ($directories as $directory) {
            $path = $path . '/' . $directory;
            if (!is_dir(public_path($path))) {
                @mkdir(public_path($path), 0755);
            }
        }
    }
}