<?php

namespace common\modules\blog\urls;

use common\modules\blog\repositories\read\BlogPostReadRepository;
use yii\base\BaseObject;
use yii\base\InvalidParamException;
use yii\caching\Cache;
use yii\caching\TagDependency;
use yii\web\UrlNormalizerRedirectException;
use yii\web\UrlRuleInterface;
use InvalidArgumentException;

class BlogMainUrlRule extends BaseObject implements UrlRuleInterface
{
	public $prefix = 'blog/post';

    private $repository;
    private $cache;

    public function __construct(BlogPostReadRepository $repository, Cache $cache, $config = [])
    {
        parent::__construct($config);
        $this->repository = $repository;
        $this->cache = $cache;
    }

    public function parseRequest($manager, $request)
    {
	    if (preg_match('#^' . $this->prefix . '/(.*[a-z])$#is', $request->pathInfo, $matches)) {
		    $path = $matches['1'];

		    $result = $this->cache->getOrSet( [ 'blog_main_route', 'path' => $path ], function () use ( $path ) {
			    if ( ! $post = $this->repository->findBySlug($this->getPathSlug( $path ) ) ) {
				    return [ 'id' => null, 'path' => null ];
			    }
			    return [ 'id' => $post->id, 'path' => $post->slug ];
		    }, null, new TagDependency(['tags' => ['blog']]) );

		    if ( empty( $result['id'] ) ) {
			    return false;
		    }

		    if ( $path != $result['path'] ) {
			    throw new UrlNormalizerRedirectException( [ 'blog/post/post', 'id' => $result['id'] ], 301 );
		    }

		    return ['blog/post/post', ['id' => $result['id']]];
	    }
	    return false;
    }

    public function createUrl($manager, $route, $params)
    {
        if ($route == 'blog/post/post') {
	        if (empty($params['id'])) {
		        throw new InvalidArgumentException('Empty id.');
	        }
	        $id = $params['id'];

            $url = $this->cache->getOrSet(['post_main_route', 'id' => $id], function () use ($id) {
                if (!$post = $this->repository->find($id)) {
                    return null;
                }
                return $post->slug;
            }, null, new TagDependency(['tags' => ['blog']]));

            if (!$url) {
                throw new InvalidParamException('Undefined id.');
            }

	        $url = $this->prefix . '/' . $url;
	        unset($params['id']);
	        if (!empty($params) && ($query = http_build_query($params)) !== '') {
		        $url .= '?' . $query;
	        }

	        return $url;
        }
        return false;
    }

	private function getPathSlug($path): string
	{
		$chunks = explode('/', $path);
		return end($chunks);
	}
}