<?php

if(!defined('ONYX')) exit;

class Theme
{
  var $id = null;
  var $name;

  function Theme($id=null)
  {
    if (!empty($id))
    {
      $db = new BDD();
      $res = $db->unique_query("SELECT `id`, `name`
			        FROM themes WHERE id=" . intval($id));

      if (!empty($res))
      {
	$this->id = $res['id'];
	$this->name = $res['name'];
      }
      else
      {
        $db->deconnexion();
	throw new ThemeNotFoundException();
      }
      $db->deconnexion();
    }
  }

  static function __set_state(array $array)
  {
    $tmp = new Theme();

    $tmp->id = $array["id"];
    $tmp->name = $array["name"];

    return $tmp;
  }

  function update()
  {
    $name = $this->name;

    $db = new BDD();
    $db->escape($name);

    if (empty($this->id))
    {
      $db->query("INSERT INTO themes
     	  	  VALUES (NULL, '".$name."');");
      $this->id = $db->insert_id();
      $aff = ($this->id > 0);
    }
    else
    {
      $db->query("UPDATE themes
     	  	  SET name = '".$name."'
     	  	  WHERE id = ".intval($this->id));
      $aff = $db->affected();
    }
    $db->deconnexion();

    Cache::del("ordered_th".$this->id);

    return ($aff == 1);
  }

  function get_name()
  {
    return $this->name;
  }

  function get_name_url()
  {
    return preg_replace("#[^a-zA-Z0-9_]#", "_", $this->name);
  }

  function get_id()
  {
    return $this->id;
  }

  function get_nb_exercices()
  {
    $db = new BDD();
    $res = $db->unique_query("SELECT count(id) as nb_exercices FROM exercices
                              WHERE id_theme = ".$this->id."
                              GROUP BY id_theme");
    $db->deconnexion();

    return $res['nb_exercices'];
  }

  function add_exercice($exercice)
  {
    if (isset($exercice))
    {
      $exercice->theme = $this;
      return $exercice->update(true);
    }
    return false;
  }

  function get_exercices_ordered()
  {
    $res = Cache::read("ordered_th".$this->id);
    if (!empty($res))
      return $res;

    $db = new BDD();
    $res = $db->query("SELECT E.id, E.require FROM exercices E
                       INNER JOIN themes T ON T.id = E.id_theme
                       WHERE T.id = ".intval($this->id));

    $db->deconnexion();

    $size = count($res);

    for ($i = 0; $i < $size; $i++)
    {
        for ($j = $i; $j < $size; $j++)
        {
            if ($i == 0)
            {
                if ($res[$j]['require'] == '')
                {
                    $tmp = $res[0];
                    $res[0] = $res[$j];
                    $res[$j] = $tmp;
                }
            }
            else
            {
                if ($res[$j]['require'] == $res[$i - 1]['id'])
                {
                    $tmp = $res[$i];
                    $res[$i] = $res[$j];
                    $res[$j] = $tmp;
                }
            }
        }
    }

    foreach($res as &$r)
      $r = new Exercice($r["id"]);

    Cache::set("ordered_th".$this->id, $res);
    return $res;
  }

  public static function get_themes()
  {
    $db = new BDD();
    $ids = $db->query("SELECT `id` FROM `themes` ORDER BY `name`");
    $db->deconnexion();

    $array = array();
    if ($ids)
      foreach ($ids as $id)
	$array[] = new Theme($id['id']);

    return $array;
  }
}

class ThemeNotFoundException extends Exception
{
}