1 files changed, 261 insertions, 0 deletions
diff --git a/phpBB/includes/group_positions.php b/phpBB/includes/group_positions.php
new file mode 100644
index 0000000000..60352ed97d
--- /dev/null
+++ b/phpBB/includes/group_positions.php
@@ -0,0 +1,261 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2011 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* Group Position class, containing all functions to manage the groups in the teampage and legend.
+*
+* group_teampage/group_legend is an ascending list 1, 2, ..., n for groups which are displayed. 1 is the first group, n the last.
+* If the value is 0 (self::GROUP_DISABLED) the group is not displayed.
+* @package phpBB3
+*/
+class phpbb_group_positions
+{
+	/**
+	* Group is not displayed
+	*/
+	const GROUP_DISABLED = 0;
+
+	/**
+	* phpbb-database object
+	*/
+	public $db = null;
+
+	/**
+	* Name of the field we want to handle: either 'teampage' or 'legend'
+	*/
+	private $field = '';
+
+	/**
+	* URI for the adm_back_link when there was an error.
+	*/
+	private $adm_back_link = '';
+
+	/**
+	* Constructor
+	*/
+	public function __construct ($db, $field, $adm_back_link = '')
+	{
+		$this->adm_back_link = $adm_back_link;
+
+		if (!in_array($field, array('teampage', 'legend')))
+		{
+			$this->error('NO_MODE');
+		}
+
+		$this->db = $db;
+		$this->field = $field;
+	}
+
+	/**
+	* Returns the group_{$this->field} for a given group, if the group exists.
+	* @param	int		$group_id	group_id of the group to be selected
+	* @return	int					position of the group
+	*/
+	public function get_group_value($group_id)
+	{
+		$sql = 'SELECT group_' . $this->field . '
+			FROM ' . GROUPS_TABLE . '
+			WHERE group_id = ' . (int) $group_id;
+		$result = $this->db->sql_query($sql);
+		$current_value = $this->db->sql_fetchfield('group_' . $this->field);
+		$this->db->sql_freeresult($result);
+
+		if ($current_value === false)
+		{
+			// Group not found.
+			$this->error('NO_GROUP');
+		}
+
+		return (int) $current_value;
+	}
+
+	/**
+	* Get number of groups, displayed on the teampage/legend
+	*
+	* @return	int		value of the last group displayed
+	*/
+	public function get_group_count()
+	{
+		$sql = 'SELECT group_' . $this->field . '
+			FROM ' . GROUPS_TABLE . '
+			ORDER BY group_' . $this->field . ' DESC';
+		$result = $this->db->sql_query_limit($sql, 1);
+		$group_count = (int) $this->db->sql_fetchfield('group_' . $this->field);
+		$this->db->sql_freeresult($result);
+
+		return $group_count;
+	}
+
+	/**
+	* Addes a group by group_id
+	*
+	* @param	int		$group_id	group_id of the group to be added
+	* @return	null
+	*/
+	public function add_group($group_id)
+	{
+		$current_value = $this->get_group_value($group_id);
+
+		if ($current_value == self::GROUP_DISABLED)
+		{
+			// Group is currently not displayed, add it at the end.
+			$next_value = 1 + $this->get_group_count();
+
+			$sql = 'UPDATE ' . GROUPS_TABLE . '
+				SET group_' . $this->field . ' = ' . $next_value . '
+				WHERE group_' . $this->field . ' = ' . self::GROUP_DISABLED . '
+					AND group_id = ' . (int) $group_id;
+			$this->db->sql_query($sql);
+		}
+	}
+
+	/**
+	* Deletes a group by setting the field to self::GROUP_DISABLED and closing the gap in the list.
+	*
+	* @param	int		$group_id		group_id of the group to be deleted
+	* @param	bool	$skip_group		Skip setting the group to GROUP_DISABLED, to save the query, when you need to update it anyway.
+	* @return	null
+	*/
+	public function delete_group($group_id, $skip_group = false)
+	{
+		$current_value = $this->get_group_value($group_id);
+
+		if ($current_value != self::GROUP_DISABLED)
+		{
+			$this->db->sql_transaction('begin');
+
+			$sql = 'UPDATE ' . GROUPS_TABLE . '
+				SET group_' . $this->field . ' = group_' . $this->field . ' - 1
+				WHERE group_' . $this->field . ' > ' . $current_value;
+			$this->db->sql_query($sql);
+
+			if (!$skip_group)
+			{
+				$sql = 'UPDATE ' . GROUPS_TABLE . '
+					SET group_' . $this->field . ' = ' . self::GROUP_DISABLED . '
+					WHERE group_id = ' . (int) $group_id;
+				$this->db->sql_query($sql);
+			}
+
+			$this->db->sql_transaction('commit');
+		}
+	}
+
+	/**
+	* Moves a group up by group_id
+	*
+	* @param	int		$group_id	group_id of the group to be moved
+	* @return	null
+	*/
+	public function move_up($group_id)
+	{
+		$this->move($group_id, 1);
+	}
+
+	/**
+	* Moves a group down by group_id
+	*
+	* @param	int		$group_id	group_id of the group to be moved
+	* @return	null
+	*/
+	public function move_down($group_id)
+	{
+		$this->move($group_id, -1);
+	}
+
+	/**
+	* Moves a group up/down
+	*
+	* @param	int		$group_id	group_id of the group to be moved
+	* @param	int		$delta		number of steps:
+	*								- positive = move up
+	*								- negative = move down
+	* @return	null
+	*/
+	public function move($group_id, $delta)
+	{
+		if (!is_int($delta) || !$delta)
+		{
+			return;
+		}
+
+		$move_up = ($delta > 0) ? true : false;
+		$current_value = $this->get_group_value($group_id);
+
+		if ($current_value != self::GROUP_DISABLED)
+		{
+			$this->db->sql_transaction('begin');
+
+			// First we move all groups between our current value and the target value up/down 1,
+			// so we have a gap for our group to move.
+			$sql = 'UPDATE ' . GROUPS_TABLE . '
+				SET group_' . $this->field . ' = group_' . $this->field . (($move_up) ? ' + 1' : ' - 1') . '
+				WHERE group_' . $this->field . ' > ' . self::GROUP_DISABLED . '
+					AND group_' . $this->field . (($move_up) ? ' >= ' : ' <= ') . ($current_value - $delta) . '
+					AND group_' . $this->field . (($move_up) ? ' < ' : ' > ') . $current_value;
+			$this->db->sql_query($sql);
+
+			// Because there might be fewer groups above/below the group than we wanted to move,
+			// we use the number of changed groups, to update the group.
+			$delta = (int) $this->db->sql_affectedrows();
+
+			if ($delta)
+			{
+				// And now finally, when we moved some other groups and built a gap,
+				// we can move the desired group to it.
+				$sql = 'UPDATE ' . GROUPS_TABLE . '
+					SET group_' . $this->field . ' = group_' . $this->field . (($move_up) ? ' - ' : ' + ') . $delta . '
+					WHERE group_id = ' . (int) $group_id;
+				$this->db->sql_query($sql);
+			}
+
+			$this->db->sql_transaction('commit');
+		}
+	}
+
+	/**
+	* Get group type language var
+	*
+	* @param	int		$group_type	group_type from the groups-table
+	* @return	string				name of the language variable for the given group-type.
+	*/
+	static public function group_type_language($group_type)
+	{
+		switch ($group_type)
+		{
+			case GROUP_OPEN:
+				return 'GROUP_REQUEST';
+			case GROUP_CLOSED:
+				return 'GROUP_CLOSED';
+			case GROUP_HIDDEN:
+				return 'GROUP_HIDDEN';
+			case GROUP_SPECIAL:
+				return 'GROUP_SPECIAL';
+			case GROUP_FREE:
+				return 'GROUP_OPEN';
+		}
+	}
+
+	/**
+	* Error
+	*/
+	public function error($message)
+	{
+		global $user;
+		trigger_error($user->lang[$message] . (($this->adm_back_link) ? adm_back_link($this->adm_back_link) : ''), E_USER_WARNING);
+	}
+}