<?php

namespace app\components\route;

use yii\base\Object;
use yii\web\UrlRuleInterface;

class ThumbnailUrlRoute extends Object implements UrlRuleInterface
{
    const PATTERN = '/^(\d+)x(\d+)([A-Za-z]{2})?\.(\w+)$/';
    public $route = 'image/resize';

    public function createUrl($manager, $route, $params)
    {
        return false;
    }

    /**
     * thumbnails/image_640x480ar.png
     * thumbnails/image_640x480.png
     *
     * @param \yii\web\UrlManager $manager
     * @param \yii\web\Request    $request
     *
     * @return array|bool
     * @throws \yii\base\InvalidConfigException
     */
    public function parseRequest($manager, $request)
    {
        $params = ['image' => null, 'width' => null, 'height' => null, 'method' => null, 'extension' => null];
        $pathInfo = $request->getPathInfo();

        $prefixLen = strlen('thumbnails/');
        if ('thumbnails/' === substr($pathInfo, 0, $prefixLen)
            && false !== ($loDashIdx = strrpos($pathInfo, '_'))
            && preg_match(self::PATTERN, substr($pathInfo, $loDashIdx + 1), $match)
        ) {
            $params['image'] = substr($pathInfo, $prefixLen, $loDashIdx - $prefixLen);
            $params['width'] = $match[1];
            $params['height'] = $match[2];
            $params['method'] = $match[3];
            $params['extension'] = $match[4];

            if ($params['image'] && is_numeric($params['width']) && is_numeric($params['height'])) {
                return [$this->route, $params];
            }
        }
        return false;
    }
}