<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\User;

use Joomla\CMS\Access\Access;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Object\CMSObject;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\Table\Table;
use Joomla\Registry\Registry;
use Joomla\Utilities\ArrayHelper;

// phpcs:disable PSR1.Files.SideEffects
\defined('JPATH_PLATFORM') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * User class.  Handles all application interaction with a user
 *
 * @since  1.7.0
 */
class User extends CMSObject
{
    /**
     * A cached switch for if this user has root access rights.
     *
     * @var    boolean
     * @since  1.7.0
     */
    protected $isRoot = null;

    /**
     * Unique id
     *
     * @var    integer
     * @since  1.7.0
     */
    public $id = null;

    /**
     * The user's real name (or nickname)
     *
     * @var    string
     * @since  1.7.0
     */
    public $name = null;

    /**
     * The login name
     *
     * @var    string
     * @since  1.7.0
     */
    public $username = null;

    /**
     * The email
     *
     * @var    string
     * @since  1.7.0
     */
    public $email = null;

    /**
     * MD5 encrypted password
     *
     * @var    string
     * @since  1.7.0
     */
    public $password = null;

    /**
     * Clear password, only available when a new password is set for a user
     *
     * @var    string
     * @since  1.7.0
     */
    public $password_clear = '';

    /**
     * Block status
     *
     * @var    integer
     * @since  1.7.0
     */
    public $block = null;

    /**
     * Should this user receive system email
     *
     * @var    integer
     * @since  1.7.0
     */
    public $sendEmail = null;

    /**
     * Date the user was registered
     *
     * @var    string
     * @since  1.7.0
     */
    public $registerDate = null;

    /**
     * Date of last visit
     *
     * @var    string
     * @since  1.7.0
     */
    public $lastvisitDate = null;

    /**
     * Activation hash
     *
     * @var    string
     * @since  1.7.0
     */
    public $activation = null;

    /**
     * User parameters
     *
     * @var    Registry
     * @since  1.7.0
     */
    public $params = null;

    /**
     * Associative array of user names => group ids
     *
     * @var    array
     * @since  1.7.0
     */
    public $groups = [];

    /**
     * Guest status
     *
     * @var    integer
     * @since  1.7.0
     */
    public $guest = null;

    /**
     * Last Reset Time
     *
     * @var    string
     * @since  3.0.1
     */
    public $lastResetTime = null;

    /**
     * Count since last Reset Time
     *
     * @var    integer
     * @since  3.0.1
     */
    public $resetCount = null;

    /**
     * Flag to require the user's password be reset
     *
     * @var    integer
     * @since  3.2
     */
    public $requireReset = null;

    /**
     * User parameters
     *
     * @var    Registry
     * @since  1.7.0
     */
    protected $_params = null;

    /**
     * Authorised access groups
     *
     * @var    array
     * @since  1.7.0
     */
    protected $_authGroups = null;

    /**
     * Authorised access levels
     *
     * @var    array
     * @since  1.7.0
     */
    protected $_authLevels = null;

    /**
     * Authorised access actions
     *
     * @var    array
     * @since  1.7.0
     */
    protected $_authActions = null;

    /**
     * Error message
     *
     * @var    string
     * @since  1.7.0
     */
    protected $_errorMsg = null;

    /**
     * @var    array  User instances container.
     * @since  1.7.3
     */
    protected static $instances = [];

    /**
     * The access level id
     *
     * @var    integer
     * @since  4.3.0
     *
     * @deprecated 4.4.0 will be removed in 6.0 as this property is not used anymore
     */
    public $aid = null;

    /**
     * Constructor activating the default information of the language
     *
     * @param   integer  $identifier  The primary key of the user to load (optional).
     *
     * @since   1.7.0
     */
    public function __construct($identifier = 0)
    {
        // Create the user parameters object
        $this->_params = new Registry();

        // Load the user if it exists
        if (!empty($identifier)) {
            $this->load($identifier);
        } else {
            // Initialise
            $this->id        = 0;
            $this->sendEmail = 0;
            $this->aid       = 0;
            $this->guest     = 1;
        }
    }

    /**
     * Returns the global User object, only creating it if it doesn't already exist.
     *
     * @param   integer  $identifier  The primary key of the user to load (optional).
     *
     * @return  User  The User object.
     *
     * @since       1.7.0
     * @deprecated  4.3 will be removed in 6.0
     *              Load the user service from the dependency injection container or via $app->getIdentity()
     *              Example: Factory::getContainer()->get(UserFactoryInterface::class)->loadUserById($id)
     */
    public static function getInstance($identifier = 0)
    {
        @trigger_error(
            sprintf(
                '%1$s() is deprecated. Load the user from the dependency injection container or via %2$s::getApplication()->getIdentity().',
                __METHOD__,
                __CLASS__
            ),
            E_USER_DEPRECATED
        );

        // Find the user id
        if (!is_numeric($identifier)) {
            return Factory::getContainer()->get(UserFactoryInterface::class)->loadUserByUsername($identifier);
        } else {
            $id = $identifier;
        }

        // If the $id is zero, just return an empty User.
        // Note: don't cache this user because it'll have a new ID on save!
        if ($id === 0) {
            return Factory::getContainer()->get(UserFactoryInterface::class)->loadUserById($id);
        }

        // Check if the user ID is already cached.
        if (empty(self::$instances[$id])) {
            self::$instances[$id] = Factory::getContainer()->get(UserFactoryInterface::class)->loadUserById($id);
        }

        return self::$instances[$id];
    }

    /**
     * Method to get a parameter value
     *
     * @param   string  $key      Parameter key
     * @param   mixed   $default  Parameter default value
     *
     * @return  mixed  The value or the default if it did not exist
     *
     * @since   1.7.0
     */
    public function getParam($key, $default = null)
    {
        return $this->_params->get($key, $default);
    }

    /**
     * Method to set a parameter
     *
     * @param   string  $key    Parameter key
     * @param   mixed   $value  Parameter value
     *
     * @return  mixed  Set parameter value
     *
     * @since   1.7.0
     */
    public function setParam($key, $value)
    {
        return $this->_params->set($key, $value);
    }

    /**
     * Method to set a default parameter if it does not exist
     *
     * @param   string  $key    Parameter key
     * @param   mixed   $value  Parameter value
     *
     * @return  mixed  Set parameter value
     *
     * @since   1.7.0
     */
    public function defParam($key, $value)
    {
        return $this->_params->def($key, $value);
    }

    /**
     * Method to check User object authorisation against an access control
     * object and optionally an access extension object
     *
     * @param   string  $action     The name of the action to check for permission.
     * @param   string  $assetname  The name of the asset on which to perform the action.
     *
     * @return  boolean  True if authorised
     *
     * @since   1.7.0
     */
    public function authorise($action, $assetname = null)
    {
        // Make sure we only check for core.admin once during the run.
        if ($this->isRoot === null) {
            $this->isRoot = false;

            // Check for the configuration file failsafe.
            $rootUser = Factory::getApplication()->get('root_user');

            // The root_user variable can be a numeric user ID or a username.
            if (is_numeric($rootUser) && $this->id > 0 && $this->id == $rootUser) {
                $this->isRoot = true;
            } elseif ($this->username && $this->username == $rootUser) {
                $this->isRoot = true;
            } elseif ($this->id > 0) {
                // Get all groups against which the user is mapped.
                $identities = $this->getAuthorisedGroups();
                array_unshift($identities, $this->id * -1);

                if (Access::getAssetRules(1)->allow('core.admin', $identities)) {
                    $this->isRoot = true;

                    return true;
                }
            }
        }

        return $this->isRoot ? true : (bool) Access::check($this->id, $action, $assetname);
    }

    /**
     * Method to return a list of all categories that a user has permission for a given action
     *
     * @param   string  $component  The component from which to retrieve the categories
     * @param   string  $action     The name of the section within the component from which to retrieve the actions.
     *
     * @return  array  List of categories that this group can do this action to (empty array if none). Categories must be published.
     *
     * @since   1.7.0
     */
    public function getAuthorisedCategories($component, $action)
    {
        // Brute force method: get all published category rows for the component and check each one
        // @todo: Modify the way permissions are stored in the db to allow for faster implementation and better scaling
        $db = Factory::getDbo();

        $subQuery = $db->getQuery(true)
            ->select($db->quoteName(['id', 'asset_id']))
            ->from($db->quoteName('#__categories'))
            ->where(
                [
                    $db->quoteName('extension') . ' = :component',
                    $db->quoteName('published') . ' = 1',
                ]
            );

        $query = $db->getQuery(true)
            ->select($db->quoteName(['c.id', 'a.name']))
            ->from('(' . $subQuery . ') AS ' . $db->quoteName('c'))
            ->join('INNER', $db->quoteName('#__assets', 'a'), $db->quoteName('c.asset_id') . ' = ' . $db->quoteName('a.id'))
            ->bind(':component', $component);
        $db->setQuery($query);
        $allCategories     = $db->loadObjectList('id');
        $allowedCategories = [];

        foreach ($allCategories as $category) {
            if ($this->authorise($action, $category->name)) {
                $allowedCategories[] = (int) $category->id;
            }
        }

        return $allowedCategories;
    }

    /**
     * Gets an array of the authorised access levels for the user
     *
     * @return  array
     *
     * @since   1.7.0
     */
    public function getAuthorisedViewLevels()
    {
        if ($this->_authLevels === null) {
            $this->_authLevels = [];
        }

        if (empty($this->_authLevels)) {
            $this->_authLevels = Access::getAuthorisedViewLevels($this->id);
        }

        return $this->_authLevels;
    }

    /**
     * Gets an array of the authorised user groups
     *
     * @return  array
     *
     * @since   1.7.0
     */
    public function getAuthorisedGroups()
    {
        if ($this->_authGroups === null) {
            $this->_authGroups = [];
        }

        if (empty($this->_authGroups)) {
            $this->_authGroups = Access::getGroupsByUser($this->id);
        }

        return $this->_authGroups;
    }

    /**
     * Clears the access rights cache of this user
     *
     * @return  void
     *
     * @since   3.4.0
     */
    public function clearAccessRights()
    {
        $this->_authLevels = null;
        $this->_authGroups = null;
        $this->isRoot      = null;
        Access::clearStatics();
    }

    /**
     * Pass through method to the table for setting the last visit date
     *
     * @param   integer  $timestamp  The timestamp, defaults to 'now'.
     *
     * @return  boolean  True on success.
     *
     * @since   1.7.0
     */
    public function setLastVisit($timestamp = null)
    {
        // Create the user table object
        /** @var \Joomla\CMS\Table\User $table */
        $table = $this->getTable();
        $table->load($this->id);

        return $table->setLastVisit($timestamp);
    }

    /**
     * Method to get the user timezone.
     *
     * If the user didn't set a timezone, it will return the server timezone
     *
     * @return \DateTimeZone
     *
     * @since 3.7.0
     */
    public function getTimezone()
    {
        $timezone = $this->getParam('timezone', Factory::getApplication()->get('offset', 'GMT'));

        return new \DateTimeZone($timezone);
    }

    /**
     * Method to get the user parameters
     *
     * @param   object  $params  The user parameters object
     *
     * @return  void
     *
     * @since   1.7.0
     */
    public function setParameters($params)
    {
        $this->_params = $params;
    }

    /**
     * Method to get the user table object
     *
     * This function uses a static variable to store the table name of the user table to
     * instantiate. You can call this function statically to set the table name if
     * needed.
     *
     * @param   string  $type    The user table name to be used
     * @param   string  $prefix  The user table prefix to be used
     *
     * @return  Table  The user table object
     *
     * @note    At 4.0 this method will no longer be static
     * @since   1.7.0
     */
    public static function getTable($type = null, $prefix = 'JTable')
    {
        static $tabletype;

        // Set the default tabletype;
        if (!isset($tabletype)) {
            $tabletype['name']   = 'user';
            $tabletype['prefix'] = 'JTable';
        }

        // Set a custom table type is defined
        if (isset($type)) {
            $tabletype['name']   = $type;
            $tabletype['prefix'] = $prefix;
        }

        // Create the user table object
        return Table::getInstance($tabletype['name'], $tabletype['prefix']);
    }

    /**
     * Method to bind an associative array of data to a user object
     *
     * @param   array  &$array  The associative array to bind to the object
     *
     * @return  boolean  True on success
     *
     * @since   1.7.0
     */
    public function bind(&$array)
    {
        // Let's check to see if the user is new or not
        if (empty($this->id)) {
            // Check the password and create the crypted password
            if (empty($array['password'])) {
                $array['password']  = UserHelper::genRandomPassword(32);
                $array['password2'] = $array['password'];
            }

            // Not all controllers check the password, although they should.
            // Hence this code is required:
            if (isset($array['password2']) && $array['password'] != $array['password2']) {
                Factory::getApplication()->enqueueMessage(Text::_('JLIB_USER_ERROR_PASSWORD_NOT_MATCH'), 'error');

                return false;
            }

            $this->password_clear = ArrayHelper::getValue($array, 'password', '', 'string');

            $array['password'] = UserHelper::hashPassword($array['password']);

            // Set the registration timestamp
            $this->set('registerDate', Factory::getDate()->toSql());
        } else {
            // Updating an existing user
            if (!empty($array['password'])) {
                if ($array['password'] != $array['password2']) {
                    $this->setError(Text::_('JLIB_USER_ERROR_PASSWORD_NOT_MATCH'));

                    return false;
                }

                $this->password_clear = ArrayHelper::getValue($array, 'password', '', 'string');

                // Check if the user is reusing the current password if required to reset their password
                if ($this->requireReset == 1 && UserHelper::verifyPassword($this->password_clear, $this->password)) {
                    $this->setError(Text::_('JLIB_USER_ERROR_CANNOT_REUSE_PASSWORD'));

                    return false;
                }

                $array['password'] = UserHelper::hashPassword($array['password']);

                // Reset the change password flag
                $array['requireReset'] = 0;
            } else {
                $array['password'] = $this->password;
            }

            // Prevent updating internal fields
            unset($array['registerDate']);
            unset($array['lastvisitDate']);
            unset($array['lastResetTime']);
            unset($array['resetCount']);
        }

        if (\array_key_exists('params', $array)) {
            $this->_params->loadArray($array['params']);

            if (\is_array($array['params'])) {
                $params = (string) $this->_params;
            } else {
                $params = $array['params'];
            }

            $this->params = $params;
        }

        // Bind the array
        if (!$this->setProperties($array)) {
            $this->setError(Text::_('JLIB_USER_ERROR_BIND_ARRAY'));

            return false;
        }

        // Make sure its an integer
        $this->id = (int) $this->id;

        return true;
    }

    /**
     * Method to save the User object to the database
     *
     * @param   boolean  $updateOnly  Save the object only if not a new user
     *                                Currently only used in the user reset password method.
     *
     * @return  boolean  True on success
     *
     * @since   1.7.0
     * @throws  \RuntimeException
     */
    public function save($updateOnly = false)
    {
        // Create the user table object
        $table        = $this->getTable();
        $this->params = (string) $this->_params;
        $table->bind($this->getProperties());

        // Allow an exception to be thrown.
        try {
            // Check and store the object.
            if (!$table->check()) {
                $this->setError($table->getError());

                return false;
            }

            // If user is made a Super Admin group and user is NOT a Super Admin

            // @todo ACL - this needs to be acl checked

            $my = Factory::getUser();

            // Are we creating a new user
            $isNew = empty($this->id);

            // If we aren't allowed to create new users return
            if ($isNew && $updateOnly) {
                return true;
            }

            // Get the old user
            $oldUser = new User($this->id);

            // Access Checks

            // The only mandatory check is that only Super Admins can operate on other Super Admin accounts.
            // To add additional business rules, use a user plugin and throw an Exception with onUserBeforeSave.

            // Check if I am a Super Admin
            $iAmSuperAdmin = $my->authorise('core.admin');

            $iAmRehashingSuperadmin = false;

            if (($my->id == 0 && !$isNew) && $this->id == $oldUser->id && $oldUser->authorise('core.admin') && $oldUser->password != $this->password) {
                $iAmRehashingSuperadmin = true;
            }

            // Check if we are using a CLI application
            $isCli = false;

            if (Factory::getApplication()->isCli()) {
                $isCli = true;
            }

            // We are only worried about edits to this account if I am not a Super Admin.
            if ($iAmSuperAdmin != true && $iAmRehashingSuperadmin != true && $isCli != true) {
                // I am not a Super Admin, and this one is, so fail.
                if (!$isNew && Access::check($this->id, 'core.admin')) {
                    throw new \RuntimeException('User not Super Administrator');
                }

                if ($this->groups != null) {
                    // I am not a Super Admin and I'm trying to make one.
                    foreach ($this->groups as $groupId) {
                        if (Access::checkGroup($groupId, 'core.admin')) {
                            throw new \RuntimeException('User not Super Administrator');
                        }
                    }
                }
            }

            // Fire the onUserBeforeSave event.
            PluginHelper::importPlugin('user');

            $result = Factory::getApplication()->triggerEvent('onUserBeforeSave', [$oldUser->getProperties(), $isNew, $this->getProperties()]);

            if (\in_array(false, $result, true)) {
                // Plugin will have to raise its own error or throw an exception.
                return false;
            }

            // Store the user data in the database
            $result = $table->store();

            // Set the id for the User object in case we created a new user.
            if (empty($this->id)) {
                $this->id = $table->get('id');
            }

            if ($my->id == $table->id) {
                $registry = new Registry($table->params);
                $my->setParameters($registry);
            }

            // Fire the onUserAfterSave event
            Factory::getApplication()->triggerEvent('onUserAfterSave', [$this->getProperties(), $isNew, $result, $this->getError()]);
        } catch (\Exception $e) {
            $this->setError($e->getMessage());

            return false;
        }

        return $result;
    }

    /**
     * Method to delete the User object from the database
     *
     * @return  boolean  True on success
     *
     * @since   1.7.0
     */
    public function delete()
    {
        PluginHelper::importPlugin('user');

        // Trigger the onUserBeforeDelete event
        Factory::getApplication()->triggerEvent('onUserBeforeDelete', [$this->getProperties()]);

        // Create the user table object
        $table = $this->getTable();

        if (!$result = $table->delete($this->id)) {
            $this->setError($table->getError());
        }

        // Trigger the onUserAfterDelete event
        Factory::getApplication()->triggerEvent('onUserAfterDelete', [$this->getProperties(), $result, $this->getError()]);

        return $result;
    }

    /**
     * Method to load a User object by user id number
     *
     * @param   mixed  $id  The user id of the user to load
     *
     * @return  boolean  True on success
     *
     * @since   1.7.0
     */
    public function load($id)
    {
        // Create the user table object
        $table = $this->getTable();

        // Load the UserModel object based on the user id or throw a warning.
        if (!$table->load($id)) {
            // Reset to guest user
            $this->guest = 1;

            Log::add(Text::sprintf('JLIB_USER_ERROR_UNABLE_TO_LOAD_USER', $id), Log::WARNING, 'jerror');

            return false;
        }

        /*
         * Set the user parameters using the default XML file.  We might want to
         * extend this in the future to allow for the ability to have custom
         * user parameters, but for right now we'll leave it how it is.
         */

        if ($table->params) {
            $this->_params->loadString($table->params);
        }

        // Assuming all is well at this point let's bind the data
        $this->setProperties($table->getProperties());

        // The user is no longer a guest
        if ($this->id != 0) {
            $this->guest = 0;
        } else {
            $this->guest = 1;
        }

        return true;
    }

    /**
     * Method to allow serialize the object with minimal properties.
     *
     * @return  array  The names of the properties to include in serialization.
     *
     * @since   3.6.0
     */
    public function __sleep()
    {
        return ['id'];
    }

    /**
     * Method to recover the full object on unserialize.
     *
     * @return  void
     *
     * @since   3.6.0
     */
    public function __wakeup()
    {
        // Initialise some variables
        $this->_params = new Registry();

        // Load the user if it exists
        if (!empty($this->id) && $this->load($this->id)) {
            // Push user into cached instances.
            self::$instances[$this->id] = $this;
        } else {
            // Initialise
            $this->id        = 0;
            $this->sendEmail = 0;
            $this->aid       = 0;
            $this->guest     = 1;
        }
    }
}
