<?php

/**
 * @file classes/user/UserSettingsDAO.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class UserSettingsDAO
 * @ingroup user
 * @see User
 *
 * @brief Operations for retrieving and modifying user settings.
 */


class UserSettingsDAO extends DAO {
	/**
	 * Retrieve a user setting value.
	 * @param $userId int
	 * @param $name
	 * @param $contextId int
	 * @return mixed
	 * @see UserSettingsDAO::getByAssoc
	 */
	function getSetting($userId, $name, $contextId = CONTEXT_SITE) {
		$result = $this->retrieve(
			'SELECT	setting_value,
				setting_type
			FROM	user_settings
			WHERE	user_id = ? AND
				setting_name = ? AND
				assoc_type = ? AND
				assoc_id = ?',
			[
				(int) $userId,
				$name,
				Application::getContextAssocType(),
				(int) $contextId
			]
		);

		$row = (array) $result->current();
		return $row?$this->convertFromDB($row['setting_value'], $row['setting_type']):null;
	}

	/**
	 * Retrieve all users by setting name and value.
	 * @param $name string
	 * @param $value mixed
	 * @param $type string
	 * @param $contextId int
	 * @return DAOResultFactory matching Users
	 */
	function getUsersBySetting($name, $value, $type = null, $contextId = CONTEXT_SITE) {
		$value = $this->convertToDB($value, $type);
		$result = $this->retrieve(
			'SELECT	u.*
			FROM	users u,
				user_settings s
			WHERE	u.user_id = s.user_id AND
				s.setting_name = ? AND
				s.setting_value = ? AND
				s.assoc_type = ? AND
				s.assoc_id = ?',
			[$name, $value, Application::getContextAssocType(), (int) $contextId]
		);

		$userDao = DAORegistry::getDAO('UserDAO'); /* @var $userDao UserDAO */
		return new DAOResultFactory($result, $userDao, '_returnUserFromRow');
	}

	/**
	 * Retrieve all settings for a user for a context.
	 * @param $userId int
	 * @param $contextId int
	 * @return array
	 */
	function getSettingsByContextId($userId, $contextId = CONTEXT_SITE) {
		$result = $this->retrieve(
			'SELECT	setting_name,
				setting_value,
				setting_type
			FROM	user_settings
			WHERE	user_id = ? AND
				assoc_type = ?
				AND assoc_id = ?',
			[(int) $userId, Application::getContextAssocType(), (int) $contextId]
		);

		$userSettings = array();
		foreach ($result as $row) {
			$value = $this->convertFromDB($row->setting_value, $row->setting_type);
			$userSettings[$row->setting_name] = $value;
		}
		return $userSettings;
	}

	/**
	 * Add/update a user setting.
	 * @param $userId int
	 * @param $name string
	 * @param $value mixed
	 * @param $type string data type of the setting. If omitted, type will be guessed
	 * @param $contextId int
	 */
	function updateSetting($userId, $name, $value, $type = null, $contextId = CONTEXT_SITE) {
		$result = $this->retrieve(
			'SELECT	COUNT(*) AS row_count
			FROM	user_settings
			WHERE	user_id = ? AND
				setting_name = ?
				AND assoc_type = ?
				AND assoc_id = ?',
			[(int) $userId, $name, Application::getContextAssocType(), (int) $contextId]
		);

		$row = (array) $result->current();
		$value = $this->convertToDB($value, $type);
		if (!$row || $row['row_count'] == 0) {
			$this->update(
				'INSERT INTO user_settings
					(user_id, setting_name, assoc_type, assoc_id, setting_value, setting_type)
				VALUES
					(?, ?, ?, ?, ?, ?)',
				[
					(int) $userId,
					$name,
					Application::getContextAssocType(),
					(int) $contextId,
					$value,
					$type
				]
			);
		} else {
			$this->update(
				'UPDATE user_settings
				SET	setting_value = ?,
					setting_type = ?
				WHERE	user_id = ? AND
					setting_name = ? AND
					assoc_type = ? AND
					assoc_id = ?',
				[
					$value,
					$type,
					(int) $userId,
					$name,
					Application::getContextAssocType(),
					(int) $contextId
				]
			);
		}
	}

	/**
	 * Delete a user setting by context.
	 * @param $userId int
	 * @param $name string
	 * @param $contextId int
	 */
	function deleteSetting($userId, $name, $contextId = CONTEXT_SITE) {
		$this->update(
			'DELETE FROM user_settings WHERE user_id = ? AND setting_name = ? AND assoc_type = ? AND assoc_id = ?',
			[(int) $userId, $name, Application::getContextAssocType(), (int) $contextId]
		);
	}

	/**
	 * Delete all settings for a user.
	 * @param $userId int
	 */
	function deleteSettings($userId) {
		return $this->update(
			'DELETE FROM user_settings WHERE user_id = ?', [(int) $userId]
		);
	}
}