<?php
 /**
  * Created by IntelliJ IDEA.
  * User: nosko
  * Date: 1/26/13
  * Time: 10:57 PM
  * To change this template use File | Settings | File Templates.
  */
 class Parser {
 
     private $restaurants = array();
     private $logger;
 
     function __construct($logger, $restaurants) {
 
         // Check if logger implements iOutput interface
         if (  !in_array("iOutput", class_implements($logger)) ) {
             throw new InvalidArgumentException("Logger class must implement interface iOutput");
         }
 
         $this->logger = $logger;
 
         if (empty($restaurants) || !is_array($restaurants)) {
             throw new InvalidArgumentException("Array argument required");
         }
 
         $this->restaurants = $restaurants;
     }
 
     public function parse() {
         foreach ($this->restaurants as $restaurant) {
 
             $source = file_get_contents($restaurant->getUrl());
 
             if ($source === false) {
                 throw new RuntimeException("Can't read source address: " . $restaurant->getUrl());
             }
 
             $dom = new DOMDocument();
             @$dom->loadHTML($source);
             $xpath_obj = new DOMXPath($dom);
 
             $this->logger->log("Restaurant: <a href='{$restaurant->getUrl()}'>" . $restaurant->getName() . "</a>".$this->logger->newLine());
 
             foreach ($restaurant->getXpaths() as $name => $xpath) {
 
                 $found = $xpath_obj->query($xpath);
 
                 if ($found === false || $found->length === 0) {
                     continue;
                 }
 
                 $this->logger->log("<b>$name</b>");
                 $exists = false;
                 foreach ($found->item(0)->childNodes as $elem) {
 
                     $meal = trim($elem->nodeValue);
                     if (!empty($meal)) {
                         $this->logger->log("\t<br>$meal\n");
                         $exists = true;
                     }
                 }
                 if (!$exists) {
                     $this->logger->log($this->logger->newLine()."{}");
                 }
                 $this->logger->log($this->logger->newLine());
             }
             $this->logger->log($this->logger->newLine());
         }
     }
 }