<?php

class WebLink {
   private $id = null;
   private $url = null;
   private $title = null;
   private $description = null;

   const TABLE = "links";

   public function getID() {
      return $this->id;
   }

   public function getURL($flag = 0) {
      switch ($flag) {
         case HTMLSAFE:
            return htmlspecialchars($this->url);
            break;
         case HTMLFORMSAFE:
            return htmlspecialchars($this->url, ENT_QUOTES);
            break;
         default:
            return $this->url;
            break;
      }
   }

   public function getTitle($flag = 0) {
      switch ($flag) {
         case HTMLSAFE:
            return htmlspecialchars($this->title);
            break;
         case HTMLFORMSAFE:
            return htmlspecialchars($this->title, ENT_QUOTES);
            break;
         default:
            return $this->title;
            break;
      }
   }

   public function getDescription($flag = 0) {
      switch ($flag) {
         case HTMLSAFE:
            return htmlspecialchars($this->description);
            break;
         case HTMLFORMSAFE:
            return htmlspecialchars($this->description, ENT_QUOTES);
            break;
         default:
            return $this->description;
            break;
      }
   }

   public function setURL($value) {
      if ( is_null($value) || ($value == "") ) return false;
      if ( !filter_var($value, FILTER_VALIDATE_URL) ) return false;
      $this->url = $value;
      return true;
   }

   public function setTitle($value) {
      if ( is_null($value) || ($value == "") ) return false;
      $this->title = $value;
      return true;
   }

   public function setDescription($value) {
      if ( is_null($value) || ($value == "") ) return false;
      $this->description = $value;
      return true;
   }

   public static function getList() {
      global $globaldbh;

      $query = "SELECT id FROM " . WebLink::TABLE . " ORDER BY title";
      $sth = $globaldbh->prepare($query);
      $sth->execute();
      $thelist = array();
      while ( $row = $sth->fetch(PDO::FETCH_ASSOC) ) {
         $thelist[] = new WebLink($row['id']);
      }
      return $thelist;
   }

   public function delete() {
      global $globaldbh;

      if ( is_null($this->id) ) return false;
      $query = "DELETE from " . WebLink::TABLE . " WHERE id=:id";
      $fields = array();
      $fields[':id'] = $this->id;
      $sth = $globaldbh->prepare($query);
      $saved = $sth->execute($fields);
      return $saved;
   }

   public function save() {
      global $globaldbh;

      $query = "INSERT INTO " . WebLink::TABLE . " " .
               "(id, url, title, description) " .
               "VALUES(:id, :url, :title, :description) " .
               "ON DUPLICATE KEY UPDATE " .
               "url=:url, title=:title, description=:description";
      $fields = array();
      $fields[':id'] = $this->getID();
      $fields[':url'] = $this->getURL();
      $fields[':title'] = $this->getTitle();
      $fields[':description'] = $this->getDescription();
      $sth = $globaldbh->prepare($query);
      $saved = $sth->execute($fields);
      return $saved;
   }

   public function __construct($id = null) {
      global $globaldbh;

      $query = "SELECT id, url, title, description FROM " . WebLink::TABLE . " WHERE id=:id";
      $fields = array();
      $fields[':id'] = $id;
      $sth = $globaldbh->prepare($query);
      $sth->execute($fields);
      if ( $row = $sth->fetch(PDO::FETCH_ASSOC) ) {
         $this->id = $row['id'];
         $this->setURL($row['url']);
         $this->setTitle($row['title']);
         $this->setDescription($row['description']);
      }
      return;
   }
}