<?php

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

class Exercice
{
  var $id = null;
  var $number;
  var $theme;
  var $require;
  var $level;
  var $points;
  var $statement;
  var $files = array();
  var $keys = array();

  function Exercice($id=null, $theme=null)
  {
    if (!empty($id))
    {
      $db = new BDD();

      $db->escape($id);
      $res = $db->unique_query("SELECT `id`, `id_theme`, `require`, `level`,
                                       `points`, `statement`
                                FROM exercices WHERE id = '$id'");

      if (!empty($res))
      {
	$this->files = $db->query("SELECT `id`, `path`, `name`, `sha1`
				   FROM exercice_files
        			   WHERE id_exercice = '$id'");
	// Decode sha1
	if ($this->files)
	  foreach($this->files as &$f)
	    $f["sha1"] = strhex($f["sha1"]);

	$this->keys = $db->query("SELECT `id`, `format`, `value`
        			  FROM exercice_keys
        			  WHERE id_exercice = '$id'");

        $db->deconnexion();

	if (!empty($theme))
	{
	  if ($res['id_theme'] == $theme->get_id())
	    $this->theme = $theme;
	  else
	    throw new InvalidThemeException();
	}
	else
	  $this->theme = new Theme($res['id_theme']);

	$this->id = $res['id'];
	$this->require = $res['require'];
	$this->level = $res['level'];
	$this->points = $res['points'];
	$this->statement = $res['statement'];

        $this->set_number();
      }
      else
      {
        $db->deconnexion();
	throw new ExerciceNotFoundException();
      }
    }
  }

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

  function get_name()
  {
    return "Exercice ".$this->number;
  }

  // retourne le nombre d'equipes qui ont résolues l'exercice
  // trié par date
  function get_solved()
  {
      $db = new BDD();

      $res = $db->query("SELECT `id_team`, `time` FROM solved
                         WHERE id_exercice = '$this->id'
                         ORDER BY time");

      $db->deconnexion();

      return $res;
  }

  function is_unlocked($team)
  {
      if ($this->require == "")
          return 1;

      $db = new BDD();

      $res = $db->unique_query("SELECT `id` FROM solved
                                WHERE id_team = '".intval($team->id)."'
                                AND id_exercice = '$this->require'");
      $db->deconnexion();
      if (empty($res))
          return 0;
      return 1;
  }

  function has_solved($team)
  {
      $db = new BDD();

      $res = $db->unique_query("SELECT `time` FROM solved WHERE id_exercice = '$this->id'
                                AND id_team = ".intval($team->get_id()));

      $db->deconnexion();

      return $res["time"];
  }

  function set_number()
  {
      if ($this->require == "")
          $this->number = 1;

      $db = new BDD();

      $exo = $this->id;
      $ret = 0;

      $checked = array();

      do
      {
        array_push($checked, $exo);
        $res = $db->unique_query("SELECT `require` FROM exercices WHERE id = ".intval($exo));
        $exo = $res['require'];
        $ret++;
      } while ($exo != "" && !in_array($exo, $checked));

      $this->number = $ret;
  }

  function update($create)
  {
    $id = $this->id;
    $theme = intval($this->theme->get_id());
    $require = $this->require;
    $level = intval($this->level);
    $points = intval($this->points);
    $statement = $this->statement;
    $files = $this->files;
    $keys = $this->keys;

    $db = new BDD();
    $db->escape($id);
    $db->escape($theme);
    $db->escape($require);
    $db->escape($statement);

    if ($create)
    {
      $db->query("INSERT INTO exercices
     	  	  VALUES ('".$id."', '".$theme."', '".$require."', '".$level."', '".$points."','".$statement."');");
    }
    else
    {
      $db->query("UPDATE exercices
     	  	  SET `theme` = '".$theme."', `require` = '".$require."', `level` = '".$level."', `point` = '".$point."', `statement` = '".$statement."'
     	  	  WHERE id = '$id'");

      $aff = $db->affected();
    }

    foreach ($this->keys as $k => $key)
    {
      $format = $key['format'];
      $value = $key['value'];
      if (isset($key['id']))
	$kid = intval($key['id']);
      else
	$kid = 0;

      $db->escape($format);
      $db->escape($value);

      if (empty($kid))
      {
	$db->query("INSERT INTO exercice_keys
	            VALUES (NULL, '".$this->id."', '".$format."', UNHEX('".strhex($value)."'))");

	$this->keys[$k]['id'] = $db->insert_id();
      }
      else
      {
	$db->query("UPDATE exercice_keys
     	  	    SET `format` = '".$format."', `value` = UNHEX('".strhex($value).")')
     	  	    WHERE id = ".$kid);
      }
    }

    foreach ($this->files as $k => $file)
    {
      $path = $file['path'];
      $name = $file['name'];
      $sha1 = $file['sha1'];

      if (isset($file['id']))
	$fid = intval($file['id']);

      $db->escape($path);
      $db->escape($name);
      $db->escape($sha1);

      if (!isset($file['id']))
      {
	$db->query("INSERT INTO exercice_files
     	  	    VALUES (NULL, '".$id."', '".$path."', '".$name."', '".$sha1."');");

	$this->files[$k]['id'] = $db->insert_id();
      }
      else
      {
	$db->query("UPDATE exercice_files
	            SET `path` = '".$path."', `name` = '".$name."', `sha1` = '".$sha1."'
   	  	    WHERE id = ".$fid);
      }
    }

    $db->deconnexion();

    //FIXME
    return 1;
  }

  function create()
  {
    update(true);
  }

  function add_key($format, $value)
  {
    $this->keys[] = array(
      "format" => $format,
      "value" => $value
      );
  }

  function add_file($path, $name, $sha1)
  {
    $this->files[] = array(
      "path" => $path,
      "name" => $name,
      "sha1" => $sha1
      );
  }

  public static function get_nb_exo_max()
  {
    $db = new BDD();
    $res = $db->unique_query("SELECT count(id) AS max FROM exercices
                              GROUP BY id_theme
                              ORDER BY max DESC
                              LIMIT 1");
    $db->deconnexion();

    return $res['max'];
  }
}

class ExerciceNotFoundException extends Exception
{
}

class InvalidThemeException extends Exception
{
}