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<?php

/**
 * @file lib/pkp/classes/cliTool/MergeUsersTool.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2003-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class mergeUsers
 * @ingroup tools
 *
 * @brief CLI tool for merging two user accounts.
 */

import('lib.pkp.classes.cliTool.CliTool');

class MergeUsersTool extends CommandLineTool {

/** @var $targetSpecifier string */
	var $targetSpecifier;

/** @var $mergeSpecifier array */
	var $mergeSpecifiers;

/**
	 * Constructor.
	 * @param $argv array command-line arguments
	 */
	function __construct($argv = array()) {
		parent::__construct($argv);

if (!isset($this->argv[0]) || !isset($this->argv[1]) ) {
			$this->usage();
			exit(1);
		}

$this->targetSpecifier = $this->argv[0];
		$this->mergeSpecifiers = array_slice($this->argv, 1);
	}

/**
	 * Print command usage information.
	 */
	function usage() {
		echo "Merge users tool\n"
			. "Use this tool to merge two or more user accounts.\n\n"
			. "Usage: {$this->scriptName} targetUsername mergeUsername1 [mergeUsername2] [...]\n"
			. "targetUsername: The target username for assets to be transferred to.\n"
			. "mergeUsername1: The username for the account to be merged. All assets (e.g.\n"
			. "                submissions) associated with this user account will be\n"
			. "                transferred to the user account that corresponds to\n"
			. "                targetUsernameusername1. The user account that corresponds\n"
			. "                to username2 will be deleted.\n\n"
			. "Multiple users to merge can be specified in the same command, e.g.:\n\n"
			. "{$this->scriptName} myUsername spamUser1 spamUser2 spamUser3\n\n"
			. "This will merge users with username \"spamUser1\", \"spamUser2\", and\n"
			. "\"spamUser3\" into the account with username \"myUsername\".\n\n"
			. "Users can be specified by ID by entering usernames of the form \"id=x\"\n"
			. "with the username in place of \"x\", e.g.:\n\n"
			. "{$this->scriptName} myUsername id=234 id=456\n\n"
			. "Usernames and IDs may be mixed as desired.\n";
	}

/**
	 * Execute the merge users command.
	 */
	function execute() {

$targetUser = $this->_getUserBySpecifier($this->targetSpecifier);
		if (!$targetUser) {
			echo "Error: \"$this->targetSpecifier\" does not specify a valid user.\n";
			exit(1);
		}

// Build a list of usernames and IDs, checking for missing users before doing anything.
		$mergeArray = array();
		foreach ($this->mergeSpecifiers as $specifier) {
			$mergeUser = $this->_getUserBySpecifier($specifier);
			if (!$mergeUser) {
				echo "Error: \"$specifier\" does not specify a valid user.\n";
				exit(2);
			}
			if ($mergeUser->getId() == $targetUser->getId()) {
				echo "Error: Cannot merge an account into itself.\n";
				exit(3);
			}
			$mergeArray[$mergeUser->getId()] = $mergeUser->getUsername();
		}

// Merge the accounts.
		import('classes.user.UserAction');
		$userAction = new UserAction();
		foreach ($mergeArray as $userId => $username) {
			$userAction->mergeUsers($userId, $targetUser->getId());
		}

if (count($mergeArray) == 1) {
			echo "Merge completed: \"$username\" merged into \"" . $targetUser->getUsername() . "\".\n";
		} else {
			echo 'Merge completed: ' . count($mergeArray) . " users merged into \"" . $targetUser->getUsername() . "\".\n";
		}
	}

/**
	 * Get a username by specifier, i.e. username or id=xyz.
	 * @param $specifier string The specifier
	 * @return User|null
	 */
	protected function _getUserBySpecifier($specifier) {
		$userDao = DAORegistry::getDAO('UserDAO'); /* @var $userDao UserDAO */
		if (substr($specifier, 0, 3) == 'id=') {
			return $userDao->getById(substr($specifier, 3));
		}
		return $userDao->getByUsername($specifier);
	}
}