<?php
 
 /**

  * Class representing restaurant
  */

 class Restaurant {

 
     private $url;
     private $name;
     private $xpaths = array();
 

     public function getName() {

         return $this->name;
     }
 

     public function getUrl() {

         return $this->url;
     }
 

     public function getXpaths() {

         return $this->xpaths;
     }
 
     /**
      * @param $name
      * @param $url
      * @param $xpaths
      */

     function __construct($name, $url, $xpaths) {

 
         if (empty($url) || empty($xpaths)) {
             throw new InvalidArgumentException("All argument are required");
         }
 
         $this->name = $name;
         $this->url = $url;
 
         if (is_string($xpaths)) {
             $this->xpaths[] = $xpaths;
         } else if (is_array($xpaths)) {
             $this->xpaths = $xpaths;
         } else {
             throw new InvalidArgumentException("Xpaths must be string or array");
         }
     }
 
 }
 

 interface iOutput {
     public function log($message);
     public function display();
 }
 
 class Output implements iOutput {
     protected $output = "";
 
     public function log($message) {
         $this->output .= $message;
     }
 
     public function display(){}
 }
 
 class HtmlOutput extends Output  {
 
     public function display(){
         echo $this->output;
     }
 }
 
 class EmailOutput {
 
     public function display(){
         // Send mail
     }
 }
 

 
 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><br>\n");

 
             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("<br>{}");

                 }

                 $this->logger->log("<br>");

             }

             $this->logger->log("<br>");

         }
     }
 
 
 }
 
 $twenties = new Restaurant("Twenties", "http://www.twenties.sk/", array("Polievky" => '//*[@id="article"]/div[2]/p[1]'));
 $pulitzer = new Restaurant("Pulitzer", "http://www.pulitzer.sk",
     array("Polievky" => '//*[@id="soups"]',
         "Hlavne jedla" => '//*[@id="meals"]'));
 $slovak = new Restaurant("Slovak pub", "http://www.arcaderestaurant.sk/articles/public_menu/show-modules/id/24",
     array("Salat" => '//*[@id="table2"]/tbody/tr[10]',
         "Polievka" => '//*[@id="table2"]/tbody/tr[2]'));
 
 

 $htmlOutput = new HtmlOutput();
 $parser = new Parser($htmlOutput, array($twenties, $pulitzer, $slovak));

 $parser->parse();

 $htmlOutput->display();

 
 
 
 /**

  * Lebo bez masa nie je den dnom. Maso je sucast jedla, preto chodim jest do
  * blizkych malych restauracii.
  */
 

 /*
 

 $sites  = [
         'Pulitzer'      => 'http://pulitzer.sk/',
         'Twenties'      => 'http://www.twenties.sk/'
 ];
 
 $xpaths = [
         'Pulitzer'      => [
                 'Polievky'                      =>      '//*[@id="soups"]',
                 'Hlavne zradla'         =>      '//*[@id="meals"]'
         ],
         'Twenties'      => [
                 'Polievka + hlavne zradla'      => '//*[@id="article"]/div[2]/p[1]'
         ]
 ];
 
 $output_file = '/tmp/results.php';
 file_put_contents($output_file, '');
 
 $dom = new DOMDocument();
 
 foreach ($sites as $restaurant => $site)
 {
         @$dom->loadHTML(file_get_contents($site));
         $xpath_obj = new DOMXPath($dom);
 
         append_result('V tovarni na jedlo s nazvom *' . $restaurant . "* maju dneska toto: \n");
 
         foreach ($xpaths[$restaurant] as $human_meal => $xpath)
         {
                 append_result("\t$human_meal:\n");
 
                 $oh_my_god_here_are_saved_meals = $xpath_obj->query($xpath);
                 if ($oh_my_god_here_are_saved_meals === FALSE
                         OR $oh_my_god_here_are_saved_meals->length === 0)
                 {
                         continue;
                 }
 
                 $found_meal = FALSE;

         foreach ($oh_my_god_here_are_saved_meals->item(0)->childNodes as $elem)

                 {
                         $meal_meal_meal = trim($elem->nodeValue);
                         if (! empty($meal_meal_meal))
                         {
                                 append_result("\t\t$meal_meal_meal\n");
                                 $found_meal = TRUE;
                         }
                 }
 
                 if (! $found_meal)
                 {
                         append_result("\tNevaria!!! Daj mi niekto gulomet, nech ich zabijem!\n");
                 }

                 else

                 {
                         append_result("\n");
                 }
         }
 }
 
 append_result("\n\nMake me better on http://git.cinan.sk/obedparser.git/ :) \n");
 
 function append_result($text)
 {
         global $output_file;
         file_put_contents($output_file, $text, FILE_APPEND | FILE_TEXT);
 }

 
 */