Gazelle/sections/torrents/merge.php

<?
if (!check_perms('torrents_edit')) {
  error(403);
}

$GroupID = $_POST['groupid'];
$OldGroupID = $GroupID;
$NewGroupID = db_string($_POST['targetgroupid']);

if (!$GroupID || !is_number($GroupID)) {
  error(404);
}
if (!$NewGroupID || !is_number($NewGroupID)) {
  error(404);
}
if ($NewGroupID == $GroupID) {
  error('Old group ID is the same as new group ID!');
}
$DB->query("
  SELECT CategoryID, Name
  FROM torrents_group
  WHERE ID = '$NewGroupID'");
if (!$DB->has_results()) {
  error('Target group does not exist.');
}
list($CategoryID, $NewName) = $DB->next_record();
/*
if ($Categories[$CategoryID - 1] != 'Music') {
  error('Only music groups can be merged.');
}
*/

$DB->query("
  SELECT Name
  FROM torrents_group
  WHERE ID = $GroupID");
list($Name) = $DB->next_record();

// Everything is legit, let's just confim they're not retarded
if (empty($_POST['confirm'])) {
  $Artists = Artists::get_artists(array($GroupID, $NewGroupID));

  View::show_header();
?>
  <div class="center thin">
  <div class="header">
    <h2>Merge Confirm!</h2>
  </div>
  <div class="box pad">
    <form class="confirm_form" name="torrent_group" action="torrents.php" method="post">
      <input type="hidden" name="action" value="merge" />
      <input type="hidden" name="auth" value="<?=$LoggedUser['AuthKey']?>" />
      <input type="hidden" name="confirm" value="true" />
      <input type="hidden" name="groupid" value="<?=$GroupID?>" />
      <input type="hidden" name="targetgroupid" value="<?=$NewGroupID?>" />
      <h3>You are attempting to merge the group:</h3>
      <ul>
        <li><?= Artists::display_artists($Artists[$GroupID], true, false)?> - <a href="torrents.php?id=<?=$GroupID?>"><?=$Name?></a></li>
      </ul>
      <h3>Into the group:</h3>
      <ul>
        <li><?= Artists::display_artists($Artists[$NewGroupID], true, false)?> - <a href="torrents.php?id=<?=$NewGroupID?>"><?=$NewName?></a></li>
      </ul>
      <input type="submit" value="Confirm" />
    </form>
  </div>
  </div>
<?
  View::show_footer();
} else {
  authorize();

  // Votes ninjutsu. This is so annoyingly complicated.
  // 1. Get a list of everybody who voted on the old group and clear their cache keys
  $DB->query("
    SELECT UserID
    FROM users_votes
    WHERE GroupID = '$GroupID'");
  while (list($UserID) = $DB->next_record()) {
    $Cache->delete_value("voted_albums_$UserID");
  }
  // 2. Update the existing votes where possible, clear out the duplicates left by key
  // conflicts, and update the torrents_votes table
  $DB->query("
    UPDATE IGNORE users_votes
    SET GroupID = '$NewGroupID'
    WHERE GroupID = '$GroupID'");
  $DB->query("
    DELETE FROM users_votes
    WHERE GroupID = '$GroupID'");
  $DB->query("
    INSERT INTO torrents_votes (GroupID, Ups, Total, Score)
      SELECT $NewGroupID, UpVotes, TotalVotes, VoteScore
      FROM (
        SELECT
          IFNULL(SUM(IF(Type = 'Up', 1, 0)), 0) As UpVotes,
          COUNT(1) AS TotalVotes,
          binomial_ci(IFNULL(SUM(IF(Type = 'Up', 1, 0)), 0), COUNT(1)) AS VoteScore
        FROM users_votes
        WHERE GroupID = $NewGroupID
        GROUP BY GroupID
      ) AS a
    ON DUPLICATE KEY UPDATE
      Ups = a.UpVotes,
      Total = a.TotalVotes,
      Score = a.VoteScore;");
  // 3. Clear the votes_pairs keys!
  $DB->query("
    SELECT v2.GroupID
    FROM users_votes AS v1
      INNER JOIN users_votes AS v2 USING (UserID)
    WHERE (v1.Type = 'Up' OR v2.Type = 'Up')
      AND (v1.GroupID IN($GroupID, $NewGroupID))
      AND (v2.GroupID NOT IN($GroupID, $NewGroupID));");
  while (list($CacheGroupID) = $DB->next_record()) {
    $Cache->delete_value("vote_pairs_$CacheGroupID");
  }
  // 4. Clear the new groups vote keys
  $Cache->delete_value("votes_$NewGroupID");

  $DB->query("
    UPDATE torrents
    SET GroupID = '$NewGroupID'
    WHERE GroupID = '$GroupID'");
  $DB->query("
    UPDATE wiki_torrents
    SET PageID = '$NewGroupID'
    WHERE PageID = '$GroupID'");

  //Comments
  Comments::merge('torrents', $OldGroupID, $NewGroupID);

  //Collages
  $DB->query("
    SELECT CollageID
    FROM collages_torrents
    WHERE GroupID = '$OldGroupID'"); // Select all collages that contain edited group
  while (list($CollageID) = $DB->next_record()) {
    $DB->query("
      UPDATE IGNORE collages_torrents
      SET GroupID = '$NewGroupID'
      WHERE GroupID = '$OldGroupID'
        AND CollageID = '$CollageID'"); // Change collage group ID to new ID
    $DB->query("
      DELETE FROM collages_torrents
      WHERE GroupID = '$OldGroupID'
        AND CollageID = '$CollageID'");
    $Cache->delete_value("collage_$CollageID");
  }
  $Cache->delete_value("torrent_collages_$NewGroupID");
  $Cache->delete_value("torrent_collages_personal_$NewGroupID");

  // Requests
  $DB->query("
    SELECT ID
    FROM requests
    WHERE GroupID = '$OldGroupID'");
  $Requests = $DB->collect('ID');
  $DB->query("
    UPDATE requests
    SET GroupID = '$NewGroupID'
    WHERE GroupID = '$OldGroupID'");
  foreach ($Requests as $RequestID) {
    $Cache->delete_value("request_$RequestID");
  }
  $Cache->delete_value('requests_group_'.$NewGroupID);

  Torrents::delete_group($GroupID);

  Torrents::write_group_log($NewGroupID, 0, $LoggedUser['ID'], "Merged Group $GroupID ($Name) to $NewGroupID ($NewName)", 0);
  $DB->query("
    UPDATE group_log
    SET GroupID = $NewGroupID
    WHERE GroupID = $GroupID");

  $GroupID = $NewGroupID;

  $DB->query("
    SELECT ID
    FROM torrents
    WHERE GroupID = '$OldGroupID'");
  while (list($TorrentID) = $DB->next_record()) {
    $Cache->delete_value("torrent_download_$TorrentID");
  }
  $Cache->delete_value("torrents_details_$GroupID");
  $Cache->delete_value("groups_artists_$GroupID");
  Torrents::update_hash($GroupID);

  header("Location: torrents.php?id=" . $GroupID);
}
?>