<?php

/*
 * Created on July 7, 2007
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2007 Yuri Astrakhan <Firstname><Lastname>@gmail.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if (!defined('MEDIAWIKI')) {
	// Eclipse helper - will be ignored in production
	require_once ('ApiQueryBase.php');
}

/**
 * Query module to enumerate all registered users.
 *
 * @ingroup API
 */
class ApiQueryAllUsers extends ApiQueryBase {

	public function __construct($query, $moduleName) {
		parent :: __construct($query, $moduleName, 'au');
	}

	public function execute() {
		$db = $this->getDB();
		$params = $this->extractRequestParams();

		$prop = $params['prop'];
		if (!is_null($prop)) {
			$prop = array_flip($prop);
			$fld_blockinfo = isset($prop['blockinfo']);
			$fld_editcount = isset($prop['editcount']);
			$fld_groups = isset($prop['groups']);
			$fld_registration = isset($prop['registration']);
		} else { 
			$fld_blockinfo = $fld_editcount = $fld_groups = $fld_registration = false;
		}

		$limit = $params['limit'];
		$this->addTables('user', 'u1');

		if (!is_null($params['from']))
			$this->addWhere('u1.user_name >= ' . $db->addQuotes($this->keyToTitle($params['from'])));

		if (!is_null($params['prefix']))
			$this->addWhere('u1.user_name LIKE "' . $db->escapeLike($this->keyToTitle( $params['prefix'])) . '%"');

		if (!is_null($params['group'])) {
			// Filter only users that belong to a given group
			$this->addTables('user_groups', 'ug1');
			$this->addWhere('ug1.ug_user=u1.user_id');
			$this->addWhereFld('ug1.ug_group', $params['group']);
		}

		if ($params['witheditsonly'])
			$this->addWhere('u1.user_editcount > 0');

		if ($fld_groups) {
			// Show the groups the given users belong to
			// request more than needed to avoid not getting all rows that belong to one user
			$groupCount = count(User::getAllGroups());
			$sqlLimit = $limit+$groupCount+1;

			$this->addTables('user_groups', 'ug2');
			$tname = $this->getAliasedName('user_groups', 'ug2');
			$this->addJoinConds(array($tname => array('LEFT JOIN', 'ug2.ug_user=u1.user_id')));
			$this->addFields('ug2.ug_group ug_group2');
		} else {
			$sqlLimit = $limit+1;
		}
		if ($fld_blockinfo) {
			$this->addTables('ipblocks');
			$this->addTables('user', 'u2');
			$u2 = $this->getAliasedName('user', 'u2');
			$this->addJoinConds(array(
				'ipblocks' => array('LEFT JOIN', 'ipb_user=u1.user_id'),
				$u2 => array('LEFT JOIN', 'ipb_by=u2.user_id')));
			$this->addFields(array('ipb_reason', 'u2.user_name blocker_name'));
		}

		$this->addOption('LIMIT', $sqlLimit);

		$this->addFields('u1.user_name');
		$this->addFieldsIf('u1.user_editcount', $fld_editcount);
		$this->addFieldsIf('u1.user_registration', $fld_registration);

		$this->addOption('ORDER BY', 'u1.user_name');

		$res = $this->select(__METHOD__);

		$data = array ();
		$count = 0;
		$lastUserData = false;
		$lastUser = false;
		$result = $this->getResult();

		//
		// This loop keeps track of the last entry.
		// For each new row, if the new row is for different user then the last, the last entry is added to results.
		// Otherwise, the group of the new row is appended to the last entry.
		// The setContinue... is more complex because of this, and takes into account the higher sql limit
		// to make sure all rows that belong to the same user are received.
		//
		while (true) {

			$row = $db->fetchObject($res);
			$count++;

			if (!$row || $lastUser !== $row->user_name) {
				// Save the last pass's user data
				if (is_array($lastUserData))
				{
					$fit = $result->addValue(array('query', $this->getModuleName()),
							null, $lastUserData);
					if(!$fit)
					{
						$this->setContinueEnumParameter('from',
								$this->keyToTitle($lastUserData['name']));
						break;
					}
				}

				// No more rows left
				if (!$row)
					break;

				if ($count > $limit) {
					// We've reached the one extra which shows that there are additional pages to be had. Stop here...
					$this->setContinueEnumParameter('from', $this->keyToTitle($row->user_name));
					break;
				}

				// Record new user's data
				$lastUser = $row->user_name;
				$lastUserData = array( 'name' => $lastUser );
				if ($fld_blockinfo) {
					$lastUserData['blockedby'] = $row->blocker_name;
					$lastUserData['blockreason'] = $row->ipb_reason;
				}
				if ($fld_editcount)
					$lastUserData['editcount'] = intval($row->user_editcount);
				if ($fld_registration)
					$lastUserData['registration'] = wfTimestamp(TS_ISO_8601, $row->user_registration);

			}

			if ($sqlLimit == $count) {
				// BUG!  database contains group name that User::getAllGroups() does not return
				// TODO: should handle this more gracefully
				ApiBase :: dieDebug(__METHOD__,
					'MediaWiki configuration error: the database contains more user groups than known to User::getAllGroups() function');
			}

			// Add user's group info
			if ($fld_groups && !is_null($row->ug_group2)) {
				$lastUserData['groups'][] = $row->ug_group2;
				$result->setIndexedTagName($lastUserData['groups'], 'g');
			}
		}

		$db->freeResult($res);

		$result->setIndexedTagName_internal(array('query', $this->getModuleName()), 'u');
	}

	public function getCacheMode( $params ) {
		return 'public';
	}

	public function getAllowedParams() {
		return array (
			'from' => null,
			'prefix' => null,
			'group' => array(
				ApiBase :: PARAM_TYPE => User::getAllGroups()
			),
			'prop' => array (
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array (
					'blockinfo',
					'groups',
					'editcount',
					'registration'
				)
			),
			'limit' => array (
				ApiBase :: PARAM_DFLT => 10,
				ApiBase :: PARAM_TYPE => 'limit',
				ApiBase :: PARAM_MIN => 1,
				ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
				ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
			),
			'witheditsonly' => false,
		);
	}

	public function getParamDescription() {
		return array (
			'from' => 'The user name to start enumerating from.',
			'prefix' => 'Search for all page titles that begin with this value.',
			'group' => 'Limit users to a given group name',
			'prop' => array(
				'What pieces of information to include.',
				'`groups` property uses more server resources and may return fewer results than the limit.'),
			'limit' => 'How many total user names to return.',
			'witheditsonly' => 'Only list users who have made edits',
		);
	}

	public function getDescription() {
		return 'Enumerate all registered users';
	}

	protected function getExamples() {
		return array (
			'api.php?action=query&list=allusers&aufrom=Y',
		);
	}

	public function getVersion() {
		return __CLASS__ . ': $Id: ApiQueryAllUsers.php 69986 2010-07-27 03:57:39Z tstarling $';
	}
}
