<?php defined('ABSPATH') or die();

if (!class_exists('rsssl_multisite')) {
    class rsssl_multisite
    {
        private static $_this;

        function __construct()
        {

            if (isset(self::$_this))
                wp_die();

            self::$_this = $this;

            register_activation_hook( __DIR__ . "/" . rsssl_plugin, array($this, 'activate'));
	        add_action('network_admin_menu', array($this, 'add_plus_ones') );
            /*filters to make sure WordPress returns the correct protocol */
            add_filter("admin_url", array($this, "check_admin_protocol"), 20, 3);
            add_filter('home_url', array($this, 'check_site_protocol'), 20, 4);
            add_filter('site_url', array($this, 'check_site_protocol'), 20, 4);
            add_action('network_admin_menu', array(&$this, 'add_multisite_menu'));
	        add_action('plugins_loaded', array($this, 'maybe_redirect_old_settings_url'), 10);

	        if ( is_network_admin() ) {
                add_action('network_admin_notices', array($this, 'show_notices'), 10);
            }

            $plugin = rsssl_plugin;
	        add_filter( "network_admin_plugin_action_links_$plugin", array($this, 'plugin_settings_link') );

            //If WP version is 5.1 or higher, use wp_insert_site hook for multisite SSL activation in new blogs
            if( version_compare(get_bloginfo('version'),'5.1', '>=') ) {
                add_action('wp_initialize_site', array($this, 'maybe_activate_ssl_in_new_blog'), 20, 1);
            } else {
                add_action('wpmu_new_blog', array($this, 'maybe_activate_ssl_in_new_blog_deprecated'), 10, 6);
            }

	        add_filter('rsssl_notices', array($this, 'add_multisite_notices'));
        }

        static function this()
        {
            return self::$_this;
        }

	    /**
	     * Redirect to the new settings page
	     *
	     * @return void
	     */
	    public function maybe_redirect_old_settings_url(){
		    if ( !rsssl_user_can_manage() || !is_network_admin() ) {
			    return;
		    }
		    if ( isset($_GET['page']) && $_GET['page'] === 'rlrsssl_really_simple_ssl' ){
			    wp_redirect(add_query_arg(['page' => 'really-simple-security'], network_admin_url('settings.php') ) );
			    exit;
		    }
	    }

	    /**
	     *
	     * @since 3.1.6
	     *
	     * Add an update count to the WordPress admin Settings menu item
	     * Doesn't work when the Admin Menu Editor plugin is active
	     *
	     */

	    public function add_plus_ones()
	    {
		    if (!rsssl_user_can_manage()) {
			    return;
		    }

		    $count = RSSSL()->admin->count_plusones();
			if ( $count > 0 ) {
				global $menu;
				foreach( $menu as $index => $menu_item ){
					if (!isset($menu_item[2]) || !isset($menu_item[0])) continue;
					if ( $menu_item[2]==='settings.php' ){
						$pattern = '/<span.*>([1-9])<\/span><\/span>/i';
						if (preg_match($pattern, $menu_item[0], $matches)){
							if (isset($matches[1])) $count = (int) $count + (int) $matches[1];
						}
						$menu[$index][0] = __('Settings') .  "<span class='update-plugins rsssl-update-count'><span class='update-count'>$count</span></span>";
					}
				}
			}
	    }

	    /**
	     * Add notices to the dashboard
	     * @param array $notices
	     *
	     * @return array
	     */
        public function add_multisite_notices( array $notices): array {
            $unset_array = array(
                'mixed_content_fixer_detected',
                'elementor',
                'divi',
            );

            foreach ( $unset_array as $unset_item ) {
                unset( $notices[$unset_item] );
            }
	        $notices['ssl_enabled'] = array(
		        'callback' => 'rsssl_ssl_enabled',
		        'score' => 30,
		        'output' => array(
			        'true' => array(
				        'msg' =>__('SSL is enabled networkwide.', 'really-simple-ssl'),
				        'icon' => 'success'
			        ),
			        'false' => array(
				        'msg' => __('SSL is not enabled on your network', 'really-simple-ssl'),
				        'icon' => 'open',
				        'plusone' => true,
			        ),
		        ),
	        );

	        $notices['multisite_server_variable_warning'] = array(
		        'condition' => array('rsssl_ssl_enabled'),
		        'callback' => 'RSSSL()->multisite->multisite_server_variable_warning',
		        'score' => 30,
		        'output' => array(
			        'no-server-variable' => array(
				        'msg' => __('You run a Multisite installation with subfolders, which prevents this plugin from fixing your missing server variable in the wp-config.php.', 'really-simple-ssl') . " "
                                .__('Because the $_SERVER["HTTPS"] variable is not set, your website may experience redirect loops.', 'really-simple-ssl') . " "
                                .__('Activate networkwide to fix this.', 'really-simple-ssl'),
				        'icon' => 'warning',
				        'plusone' => true,
			        ),
		        ),
	        );

	        $notices['activation_not_completed'] = array(
		        'callback' => 'RSSSL()->multisite->ssl_activation_started_but_not_completed',
		        'score' => 30,
		        'output' => array(
			        'true' => array(
				        'title' => __("SSL activation in progress", "really-simple-ssl"),
				        'msg' => __('A networkwide SSL activation process has been started, but has not been completed. Please go to the SSL settings page to complete the process.', 'really-simple-ssl').'&nbsp;'.
				                 '<a href="'.add_query_arg(['page'=>'really-simple-security'], network_admin_url('settings.php') ).'">'.__('View settings page','really-simple-ssl').'</a>',
				        'icon' => 'warning',
				        'plusone' => true,
				        'admin_notice' => true,
			        ),
		        ),
	        );

	        $notices['subdomains_no_wildcard'] = array(
		        'condition' => array('rsssl_ssl_enabled'),
		        'callback' => 'RSSSL()->multisite->subdomains_no_wildcard',
		        'score' => 30,
		        'output' => array(
			        'subdomains-no-wildcard' => array(
				        'msg' => __("You run a Multisite installation with subdomains, but your site doesn't have a wildcard certificate.", 'really-simple-ssl') . " "
				                 . __("This leads to issues when activating SSL networkwide since subdomains will be forced over SSL as well while they don't have a valid certificate.", 'really-simple-ssl') . " "
				                 . __("Activate SSL per site or install a wildcard certificate to fix this.", 'really-simple-ssl'),
				        'icon' => 'warning',
				        'dismissible' => true,
				        'plusone' => true,
			        ),
		        ),
	        );

            return $notices;
        }

	    /**
         * Check if site has a server var issue.
	     * @return string
	     */

        public function multisite_server_variable_warning(){
	        if (!function_exists('is_plugin_active_for_network'))
		        require_once(ABSPATH . '/wp-admin/includes/plugin.php');

	        if ( is_multisite() && !is_plugin_active_for_network(rsssl_plugin) && $this->is_multisite_subfolder_install() ) {
		        //with no server variables, the website could get into a redirect loop.
		        if (RSSSL()->admin->no_server_variable) {
                    return 'no-server-variable';
		        }
	        }
	        return 'success';
        }

	    /**
         * Check if we have a subdomains setup, but no wildcard
	     * @return string
	     */

	    public function subdomains_no_wildcard(){
		    if ( get_site_option('rsssl_network_activation_status' !== 'completed') && !$this->is_multisite_subfolder_install() && !RSSSL()->certificate->is_wildcard() ) {
                return 'subdomains-no-wildcard';
		    }
		    return 'success';
	    }

	    /**
         * Add settings link on plugins overview page
	     *
	     * @param array $links
         *
         * @return array
	     * @since  2.0
	     * @access public
	     */

	    public function plugin_settings_link(array $links): array {
		    if ( !rsssl_user_can_manage() ) {
			    return $links;
		    }

		    $url = add_query_arg(array('page' => 'really-simple-security'), network_admin_url('settings.php') );
		    $settings_link = '<a href="' . $url . '">' . __("Settings", "really-simple-ssl") . '</a>';
		    array_unshift($links, $settings_link);

		    $support = apply_filters('rsssl_support_link', '<a target="_blank" href="https://wordpress.org/support/plugin/really-simple-ssl/">' . __('Support', 'really-simple-ssl') . '</a>');
		    array_unshift($links, $support);

		    if ( ! defined( 'rsssl_pro_version' ) ) {
			    $upgrade_link = '<a style="color:#2271b1;font-weight:bold" target="_blank" href="https://really-simple-ssl.com/pro/?mtm_campaign=settings&mtm_kwd=multisite&mtm_source=free&mtm_content=upgrade">' . __( 'Improve security - Upgrade', 'really-simple-ssl' ) . '</a>';
			    array_unshift( $links, $upgrade_link );
		    }
		    return $links;
	    }

	    /**
         * When a new site is added, maybe activate SSL as well.
         *
	     * @param int  $blog_id
	     * @param bool $user_id
	     * @param bool $domain
	     * @param bool $path
	     * @param bool $site_id
	     * @param bool $meta
	     */

        public function maybe_activate_ssl_in_new_blog_deprecated( int $blog_id, $user_id=false, $domain=false, $path=false, $site_id=false, $meta=false)
        {

	        if ( get_site_option('rsssl_network_activation_status' === 'completed') ) {
                $site = get_blog_details($blog_id);
	            switch_to_blog($site->blog_id);
                RSSSL()->admin->activate_ssl(false);
                restore_current_blog();
            }
        }

        /**
         * Activate SSl in new block
         * @since 3.1.6
         * @param $site
         * @return void
         */

        public function maybe_activate_ssl_in_new_blog($site)
        {
            if ( get_site_option('rsssl_network_activation_status' === 'completed') ) {
	            switch_to_blog($site->blog_id);
                RSSSL()->admin->activate_ssl(false);
                restore_current_blog();
            }
        }

        /**
            Add network menu for SSL
            Only when plugin is network activated.
        */

        public function add_multisite_menu()
        {
            if ( !is_multisite() || !rsssl_is_networkwide_active() ) {
				return;
            }

	        if ( !rsssl_user_can_manage() ) {
		        return;
	        }
	        $count = RSSSL()->admin->count_plusones();
	        $update_count = $count > 0 ? "<span class='update-plugins rsssl-update-count'><span class='update-count'>$count</span></span>" : "";
	        $page_hook_suffix = add_submenu_page(
				'settings.php',
				__("SSL & Security","really-simple-ssl"),
		        __("SSL & Security","really-simple-ssl").' '.$update_count,
				'manage_security',
				"really-simple-security",
				'rsssl_settings_page'
	        );
	        add_action( "admin_print_scripts-{$page_hook_suffix}", 'rsssl_plugin_admin_scripts' );
        }

	    /**
	     * Check if an SSL process is active
	     * @return bool
	     */
        public function ssl_process_active(){
            if ( get_site_option('rsssl_ssl_activation_active') ){
                return true;
            }
            return false;
        }

	    /**
	     * Run SSL upgrade process
	     *
	     * @return void
	     */
        public function run_ssl_process(){
            if ( get_site_option('rsssl_ssl_activation_active') ){
                $this->activate_ssl_networkwide();
            }
            update_site_option('rsssl_run', false);
        }

	    /**
	     * @param WP_REST_Request $request
	     *
	     * @return array
	     */
		public function process_ssl_activation_step(){
			if ( !$this->ssl_process_active() ) {
				$this->start_ssl_activation();
			}
			$this->run_ssl_process();
			$progress = $this->get_process_completed_percentage();
			return [
				'progress' => $progress,
				'success' => true
			];
		}

	    /**
	     * Get SSL process completed percentage
	     * @return int
	     */
        public function get_process_completed_percentage(){
			if ( get_site_option('rsssl_network_activation_status') === 'completed' ) {
				return 100;
			}
            $complete_count = get_site_option('rsssl_siteprocessing_progress');
			$blog_count = $this->get_total_blog_count();
	        $blog_count = $blog_count !== 0 ? $blog_count : 1; //prevent division by zero
            $percentage = round(( $complete_count/$blog_count )*100,0);
            if ( $percentage > 99 ) {
				$percentage = 100;
            }

            return (int) $percentage;
        }

	    /**
	     * Check if website has started activation, but didn't completed
	     * @return bool
	     */
		public function ssl_activation_started_but_not_completed(){
			if ( !get_option('rsssl_network_activation_status') ) {
				return false;
			}
			return get_option('rsssl_network_activation_status')!=='completed';
        }

	    /**
	     * Start SSL activation
	     *
	     * @return void
	     */
        public function start_ssl_activation(){
	        if (!rsssl_user_can_manage()) {
		        return;
	        }
            update_site_option('rsssl_siteprocessing_progress', 0);
            update_site_option('rsssl_ssl_activation_active', true);
        }

	    /**
	     * End SSL activation
	     *
	     * @return void
	     */
        public function end_ssl_activation(){
	        if (!rsssl_user_can_manage()) {
		        return;
	        }
            update_site_option('rsssl_ssl_activation_active', false);
        }

	    /**
	     * Activate SSL network wide
	     */

        public function activate_ssl_networkwide()
        {
	        if (!rsssl_user_can_manage()) {
		        return;
	        }
            //run chunked
            $nr_of_sites = 200;
            $current_offset = get_site_option('rsssl_siteprocessing_progress');
            //set batch of sites
	        $args = array(
		        'number' => $nr_of_sites,
		        'offset' => $current_offset,
                'meta_query' => [
			        'relation' => 'or',
			        [
				        'key'   => 'rsssl_ssl_activated',
				        'compare' => 'NOT EXISTS'
			        ],
			        [
				        'key'   => 'rsssl_ssl_activated',
				        'value' => false,
				        'compare' => '=',
			        ],
		        ]
	        );

	        $sites = get_sites($args);
            //if no sites are found, we assume we're done.
            if ( count($sites)==0 ) {
                $this->end_ssl_activation();
	            update_site_option('rsssl_network_activation_status', 'completed');
            } else {
                foreach ($sites as $site) {
	                switch_to_blog($site->blog_id);
	                update_site_meta($site->blog_id, 'rsssl_ssl_activated', true );
                    RSSSL()->admin->activate_ssl(false);
                    restore_current_blog(); //switches back to previous blog, not current, so we have to do it each loop
                    update_site_option('rsssl_siteprocessing_progress', $current_offset+$nr_of_sites);
                }
            }
        }

	    /**
	     * Deactivate SSL on all subsites
	     *
	     * @return void
	     */

        public function deactivate()
        {
	        if (!rsssl_user_can_manage()) {
		        return;
	        }
			$ssl_was_enabled = rsssl_get_option('ssl_enabled');
	        delete_site_option('rsssl_network_activation_status');
	        update_option('ssl_enabled', false);
			//main site first
	        $site_id = get_main_site_id();
			switch_to_blog($site_id);
			RSSSL()->admin->deactivate_site($ssl_was_enabled);
	        restore_current_blog();

	        //because the deactivation should be a one click procedure, chunking this would cause difficulties
	        $args = array(
		        'number' => $this->get_total_blog_count(),
		        'offset' => 0,
	        );
	        $sites = get_sites($args);
            foreach ($sites as $site) {
	            switch_to_blog($site->blog_id);
	            update_site_meta($site->blog_id, 'rsssl_ssl_activated', false );
				//we already did the main site
				if ( !is_main_site() ) {
					RSSSL()->admin->deactivate_site($ssl_was_enabled);
				}
                restore_current_blog();
            }
        }

        /**
         * filters the get_admin_url function to correct the false https urls wordpress returns for non SSL websites.
         *
         * @since 2.3.10
         *
         */

        public function check_admin_protocol($url, $path, $blog_id)
        {
            if ( !$blog_id ) $blog_id = get_current_blog_id();

            //if the force_ssl_admin is defined, the admin_url should not be forced back to http: all admin panels should be https.
            if (defined('FORCE_SSL_ADMIN')) return $url;

            //do not force to http if the request is made for an url of the current blog.
            //if a site is loaded over https, it should return https links, unless the url is requested for another blog.
            //In that case, we only return a https link if the site_url is https, and http otherwise.
            if (get_current_blog_id() == $blog_id) return $url;

            //now check if the blog is http or https, and change the url accordingly
	        if (!function_exists('is_plugin_active_for_network'))
		        require_once(ABSPATH . '/wp-admin/includes/plugin.php');

            if ( !is_plugin_active_for_network(rsssl_plugin) ) {
                $home_url = get_blog_option($blog_id, 'home');
                if (strpos($home_url, "https://") === false) {
                    $url = str_replace("https://", "http://", $url);
                }
            }

            return $url;
        }

        /**
         * filters the home_url and/or site_url function to correct the false https urls wordpress returns for non SSL websites.
         *
         * @since 2.3.17
         *
         */

        public function check_site_protocol($url, $path, $orig_scheme, $blog_id)
        {
            if ( !$blog_id ) {
				$blog_id = get_current_blog_id();
            }

            if (get_current_blog_id() == $blog_id) return $url;

	        if (!function_exists('is_plugin_active_for_network'))
		        require_once(ABSPATH . '/wp-admin/includes/plugin.php');

	        if ( !is_plugin_active_for_network(rsssl_plugin) ) {
				$home_url = get_blog_option($blog_id, 'home');
                if (strpos($home_url, "https://") === false) {
                    $url = str_replace("https://", "http://", $url);
                }
            }
            return $url;
        }


        /**
         * Checks if we are on a subfolder install. (domain.com/site1 )
         *
         * @since  2.2
         *
         * @access public
         *
         **/

        public function is_multisite_subfolder_install()
        {
            if ( !is_multisite() ) {
                return false;
            }
            //we check this manually, as the SUBDOMAIN_INSTALL constant of wordpress might return false for domain mapping configs
            $is_subfolder = false;
	        $args = array(
		        'number' => 5,
		        'offset' => 0,
	        );
	        $sites = get_sites($args);
            foreach ($sites as $site) {
	            switch_to_blog($site->blog_id);
				if ($this->is_subfolder(home_url())) {
                    $is_subfolder = true;
                }
                restore_current_blog(); //switches back to previous blog, not current, so we have to do it each loop
                if ($is_subfolder) return true;
            }

            return false;
        }

        /**
         * Test if a domain has a subfolder structure
         *
         * @since  2.2
         *
         * @param string $domain
         *
         * @access private
         *
         * @return bool
         */

        public function is_subfolder($domain)
        {
            //remove slashes of the http(s)
            $domain = preg_replace("/(http:\/\/|https:\/\/)/", "", $domain);
            if ( strpos($domain, "/") !== FALSE ) {
                return true;
            }
            return false;
        }

        /**
         * Show notices
         *
         * @since  2.0
         *
         * @access public
         *
         */

        public function show_notices()
        {
			if ( !rsssl_user_can_manage() ) {
				return;
			}

            //prevent showing the review on edit screen, as gutenberg removes the class which makes it editable.
            $screen = get_current_screen();
	        if ( $screen && $screen->base === 'post' ) return;

	        if ( !$this->is_settings_page() ) {
		        $notices = RSSSL()->admin->get_notices_list( array('admin_notices'=>true) );
		        foreach ( $notices as $id => $notice ){
			        $notice = $notice['output'];
			        $class = ( $notice['status'] !== 'completed' ) ? 'error' : 'updated';
			        $more_info = $notice['url'] ?? false;
			        $dismiss_id = isset($notice['dismissible']) && $notice['dismissible'] ? $id : false;
			        echo RSSSL()->admin->notice_html( $class.' '.$id, $notice['msg'], $more_info, $dismiss_id);
		        }
            }
        }

	    /**
	     * Check if we are on the settings page
	     * @return bool
	     */

        public function is_settings_page()
        {
	        if (!rsssl_user_can_manage()) {
		        return false;
	        }
            return (isset($_GET['page']) && $_GET['page'] === 'really-simple-security');
        }

	    /**
	     * Get blog count for all networks
	     *
	     * @return int
	     */
        public function get_total_blog_count()
        {
            //Get the total blog count from all multisite networks
            $networks = get_networks();
            $total_blog_count = 0;
            foreach($networks as $network){
                $network_id = ($network->__get('id'));
                $blog_count = get_blog_count($network_id);
                $total_blog_count += $blog_count;
            }

            return $total_blog_count;
        }

    } //class closure
}
