<?
authorize();

if (!isset($_POST['id']) || !is_number($_POST['id'])) {
  error(0);
}
$ArticleID = (int)$_POST['id'];

include(SERVER_ROOT.'/classes/validate.class.php');
$Val = new VALIDATE;
$Val->SetFields('title', '1', 'string', 'The title must be between 3 and 100 characters', array('maxlength' => 100, 'minlength' => 3));
$Err = $Val->ValidateForm($_POST);
if ($Err) {
  error($Err);
}

$P = [];
$P = db_array($_POST);

$Article = Wiki::get_article($ArticleID);
list($OldRevision, $OldTitle, $OldBody, $CurRead, $CurEdit, $OldDate, $OldAuthor) = array_shift($Article);
if ($CurEdit > $LoggedUser['EffectiveClass']) {
  error(403);
}

if (check_perms('admin_manage_wiki')) {
  $Read=$_POST['minclassread'];
  $Edit=$_POST['minclassedit'];
  if (!is_number($Read)) {
    error(0); //int?
  }
  if (!is_number($Edit)) {
    error(0);
  }
  if ($Edit > $LoggedUser['EffectiveClass']) {
    error('You can\'t restrict articles above your own level.');
  }
  if ($Edit < $Read) {
    $Edit = $Read; //Human error fix.
  }
}

$MyRevision = $_POST['revision'];
if ($MyRevision != $OldRevision) {
  error('This article has already been modified from its original version.');
}

// Store previous revision
$DB->query("
  INSERT INTO wiki_revisions
    (ID, Revision, Title, Body, Date, Author)
  VALUES
    ('".db_string($ArticleID)."', '".db_string($OldRevision)."', '".db_string($OldTitle)."', '".db_string($OldBody)."', '".db_string($OldDate)."', '".db_string($OldAuthor)."')");

// Update wiki entry
$SQL = "
  UPDATE wiki_articles
  SET
    Revision = '".db_string($OldRevision + 1)."',
    Title = '$P[title]',
    Body = '$P[body]',";
if ($Read && $Edit) {
  $SQL .= "
    MinClassRead = '$Read',
    MinClassEdit = '$Edit',";
}
$SQL .= "
    Date = '".sqltime()."',
    Author = '$LoggedUser[ID]'
  WHERE ID = '$P[id]'";
$DB->query($SQL);
Wiki::flush_article($ArticleID);

header("Location: wiki.php?action=article&id=$ArticleID");
