<?php

/**
 * @file classes/notification/NotificationSubscriptionSettingsDAO.inc.php
 *
 * Copyright (c) 2014-2019 Simon Fraser University
 * Copyright (c) 2000-2019 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * @class NotificationSubscriptionSettingsDAO
 * @ingroup notification
 * @see Notification
 *
 * @brief Operations for retrieving and modifying user's notification settings.
 *  This class stores user settings that determine how notifications should be
 *  delivered to them.
 */


class NotificationSubscriptionSettingsDAO extends DAO {

	/**
	 * Delete a notification setting by setting name
	 * @param $notificationId int
	 * @param $userId int
	 * @param $settingName string optional
	 */
	function deleteNotificationSubscriptionSettings($notificationId, $userId, $settingName = null) {
		$params = array((int) $notificationId, (int) $userId);
		if ($settingName) $params[] = $settingName;

		return $this->update(
			'DELETE FROM notification_subscription_settings
			WHERE notification_id= ? AND user_id = ?' . isset($settingName) ? '  AND setting_name = ?' : '',
			$params
		);
	}

	/**
	 * Retrieve Notification subscription settings by user id
	 * @param $settingName string
	 * @param $userId int
	 * @param $contextId int
	 * @return array
	 */
	function &getNotificationSubscriptionSettings($settingName, $userId, $contextId) {
		$result = $this->retrieve(
			'SELECT setting_value FROM notification_subscription_settings WHERE user_id = ? AND setting_name = ? AND context = ?',
			array((int) $userId, $settingName, (int) $contextId)
		);

		$settings = array();
		while (!$result->EOF) {
			$row = $result->GetRowAssoc(false);
			$settings[] = (int) $row['setting_value'];
			$result->MoveNext();
		}

		$result->Close();
		return $settings;
	}

	/**
	 * Update a user's notification subscription settings
	 * @param $settingName string
	 * @param $settings array
	 * @param $userId int
	 * @param $contextId int
	 */
	function updateNotificationSubscriptionSettings($settingName, $settings, $userId, $contextId) {
		// Delete old settings first, then insert new settings
		$this->update('DELETE FROM notification_subscription_settings WHERE user_id = ? AND setting_name = ? AND context = ?',
			array((int) $userId, $settingName, (int) $contextId));

		foreach ($settings as $setting) {
			$this->update(
				'INSERT INTO notification_subscription_settings
					(setting_name, setting_value, user_id, context, setting_type)
					VALUES
					(?, ?, ?, ?, ?)',
				array(
					$settingName,
					(int) $setting,
					(int) $userId,
					(int) $contextId,
					'int'
				)
			);
		}
	}

	/**
	 * Gets a user id by an RSS token value
	 * @param $token int
	 * @param $contextId
	 * @return int
	 */
	function getUserIdByRSSToken($token, $contextId) {
		$result = $this->retrieve(
			'SELECT user_id FROM notification_subscription_settings WHERE setting_value = ? AND setting_name = ? AND context = ?',
			array($token, 'token', (int) $contextId)
		);

		$row = $result->GetRowAssoc(false);
		$userId = $row['user_id'];

		$result->Close();
		return $userId;
	}

	/**
	 * Gets an RSS token for a user id
	 * @param $userId int
	 * @param $contextId int
	 * @return int
	 */
	function getRSSTokenByUserId($userId, $contextId) {
		$result = $this->retrieve(
			'SELECT setting_value FROM notification_subscription_settings WHERE user_id = ? AND setting_name = ? AND context = ?',
				array((int) $userId, 'token', (int) $contextId)
		);

		$row = $result->GetRowAssoc(false);
		$tokenId = $row['setting_value'];

		$result->Close();
		return $tokenId;
	}

	/**
	 * Generates and inserts a new token for a user's RSS feed
	 * @param $userId int
	 * @param $contextId int
	 * @return int
	 */
	function insertNewRSSToken($userId, $contextId) {
		$token = uniqid(rand());

		// Recurse if this token already exists
		if($this->getUserIdByRSSToken($token, $contextId)) return $this->insertNewRSSToken($userId, $contextId);

		$this->update(
			'INSERT INTO notification_subscription_settings
				(setting_name, setting_value, user_id, context, setting_type)
				VALUES
				(?, ?, ?, ?, ?)',
			array(
				'token',
				$token,
				(int) $userId,
				(int) $contextId,
				'string'
			)
		);

		return $token;
	}

}


