<?php

/*
 * FecShop file.
 *
 * @link http://www.fecshop.com/
 * @copyright Copyright (c) 2016 FecShop Software LLC
 * @license http://www.fecshop.com/license/
 */

namespace fecshop\services;

//use fecshop\models\mongodb\UrlRewrite;
use Yii;
use yii\base\InvalidConfigException;

/**
 * rewrite class \yii\web\Request
 * use custom url in our system, example: www.example.com/xxxxx.html, this file is not
 * exit in our system, In order to consider SEO, we can use db storage  map between custom url and yii url
 * when request visit /xxxx.html, select this custom url in mongodb, return the yii url ,ex.  /product/index?_id=3
 * then , resolve /product/index?_id=3 .
 * @author Terry Zhao <2358269014@qq.com>
 * @since 1.0
 */
class Request extends \yii\web\Request
{
    protected $_urlRewriteModelName = '\fecshop\models\mongodb\UrlRewrite';

    protected $_urlRewriteModel;
    
    public function init()
    {
        parent::init();
        list($this->_urlRewriteModelName, $this->_urlRewriteModel) = \Yii::mapGet($this->_urlRewriteModelName);
    }

    /**
     * rewrite yii\web\Request  resolveRequestUri().
     */
    protected function resolveRequestUri()
    {
        if (isset($_SERVER['HTTP_X_REWRITE_URL'])) { // IIS
            $requestUri = $_SERVER['HTTP_X_REWRITE_URL'];
        } elseif (isset($_SERVER['REQUEST_URI'])) {
            $requestUri = $_SERVER['REQUEST_URI'];
            if ($requestUri !== '' && $requestUri[0] !== '/') {
                $requestUri = preg_replace('/^(http|https):\/\/[^\/]+/i', '', $requestUri);
            }
        } elseif (isset($_SERVER['ORIG_PATH_INFO'])) { // IIS 5.0 CGI
            $requestUri = $_SERVER['ORIG_PATH_INFO'];
            if (!empty($_SERVER['QUERY_STRING'])) {
                $requestUri .= '?' . $_SERVER['QUERY_STRING'];
            }
        } else {
            throw new InvalidConfigException('Unable to determine the request URI.');
        }

        /*
         * Replace Code
         * //return $requestUri;
         * To:
         */
        return $this->getRewriteUri($requestUri);
    }

    /**
     * get module request url by db ;.
     */
    protected function getRewriteUri($requestUri)
    {
        $baseUrl = $this->getBaseUrl();
        $requestUriRelative = $requestUri;
        if ($baseUrl) {
            $requestUriRelative = substr($requestUriRelative, strlen($baseUrl));
        }

        //echo $requestUriRelative;exit;
        $urlKey = '';
        $urlParam = '';
        $urlParamSuffix = '';

        if (strstr($requestUriRelative, '#')) {
            list($urlNoSuffix, $urlParamSuffix) = explode('#', $requestUriRelative);
            if (strstr($urlNoSuffix, '?')) {
                list($urlKey, $urlParam) = explode('?', $urlNoSuffix);
            }
        } elseif (strstr($requestUriRelative, '?')) {
            list($urlKey, $urlParam) = explode('?', $requestUriRelative);
        } else {
            $urlKey = $requestUriRelative;
        }
        if ($urlParamSuffix) {
            $urlParamSuffix = '#'.$urlParamSuffix;
        }
        if ($originUrlPath = Yii::$app->url->getOriginUrl($urlKey)) {
            if (strstr($originUrlPath, '?')) {
                if ($urlParam) {
                    $url = $originUrlPath.'&'.$urlParam.$urlParamSuffix;
                } else {
                    $url = $originUrlPath.$urlParamSuffix;
                }
                $this->setRequestParam($originUrlPath);
            } else {
                if ($urlParam) {
                    $url = $originUrlPath.'?'.$urlParam.$urlParamSuffix;
                } else {
                    $url = $originUrlPath.$urlParamSuffix;
                }
            }

            return $baseUrl.$url;
        } else {
            return $requestUri;
        }
    }

    /**
     * after get urlPath from db, if urlPath has get param ,
     * set the param to $_GET.
     */
    public function setRequestParam($originUrlPath)
    {
        $arr = explode('?', $originUrlPath);
        $yiiUrlParam = $arr[1];
        $arr = explode('&', $yiiUrlParam);
        foreach ($arr as $a) {
            list($key, $val) = explode('=', $a);
            $_GET[$key] = $val;
        }
    }

    /**
     *  mongodb url_rewrite collection columns: _id,  type ,custom_url, yii_url,
     *	if selete date from $this->_urlRewriteModel, return the yii url.
     */
    protected function getOriginUrl($urlKey)
    {
        $UrlData = $this->_urlRewriteModel->find()->where([
            'custom_url_key' => $urlKey,
        ])->asArray()->one();
        if ($UrlData['custom_url_key']) {
            return $UrlData['origin_url'];
        }
    }
}