<?php
    /**
     * @package     Freemius
     * @copyright   Copyright (c) 2015, Freemius, Inc.
     * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
     * @since       1.0.7
     */

    if ( ! defined( 'ABSPATH' ) ) {
        exit;
    }

    class FS_Admin_Notice_Manager {
        /**
         * @since 1.2.2
         *
         * @var string
         */
        protected $_module_unique_affix;
        /**
         * @var string
         */
        protected $_id;
        /**
         * @var string
         */
        protected $_title;
        /**
         * @var array[string]array
         */
        private $_notices = array();
        /**
         * @var FS_Key_Value_Storage
         */
        private $_sticky_storage;
        /**
         * @var FS_Logger
         */
        protected $_logger;
        /**
         * @since 2.0.0
         * @var int The ID of the blog that is associated with the current site level admin notices.
         */
        private $_blog_id = 0;
        /**
         * @since 2.0.0
         * @var bool
         */
        private $_is_network_notices;

        /**
         * @var FS_Admin_Notice_Manager[]
         */
        private static $_instances = array();

        /**
         * @param string $id
         * @param string $title
         * @param string $module_unique_affix
         * @param bool   $is_network_and_blog_admins           Whether or not the message should be shown both on
         *                                                     network and blog admin pages.
         * @param bool   $network_level_or_blog_id Since 2.0.0
         *
         * @return \FS_Admin_Notice_Manager
         */
        static function instance(
            $id,
            $title = '',
            $module_unique_affix = '',
            $is_network_and_blog_admins = false,
            $network_level_or_blog_id = false
        ) {
            if ( $is_network_and_blog_admins ) {
                $network_level_or_blog_id = true;
            }

            $key = strtolower( $id );

            if ( is_multisite() ) {
                if ( true === $network_level_or_blog_id ) {
                    $key .= ':ms';
                } else if ( is_numeric( $network_level_or_blog_id ) && $network_level_or_blog_id > 0 ) {
                    $key .= ":{$network_level_or_blog_id}";
                } else {
                    $network_level_or_blog_id = get_current_blog_id();

                    $key .= ":{$network_level_or_blog_id}";
                }
            }

            if ( ! isset( self::$_instances[ $key ] ) ) {
                self::$_instances[ $key ] = new FS_Admin_Notice_Manager(
                    $id,
                    $title,
                    $module_unique_affix,
                    $is_network_and_blog_admins,
                    $network_level_or_blog_id
                );
            }

            return self::$_instances[ $key ];
        }

        /**
         * @param string $id
         * @param string $title
         * @param string $module_unique_affix
         * @param bool   $is_network_and_blog_admins Whether or not the message should be shown both on network and
         *                                             blog admin pages.
         * @param bool|int $network_level_or_blog_id
         */
        protected function __construct(
            $id,
            $title = '',
            $module_unique_affix = '',
            $is_network_and_blog_admins = false,
            $network_level_or_blog_id = false
        ) {
            $this->_id                  = $id;
            $this->_logger              = FS_Logger::get_logger( WP_FS__SLUG . '_' . $this->_id . '_data', WP_FS__DEBUG_SDK, WP_FS__ECHO_DEBUG_SDK );
            $this->_title               = ! empty( $title ) ? $title : '';
            $this->_module_unique_affix = $module_unique_affix;
            $this->_sticky_storage      = FS_Key_Value_Storage::instance( 'admin_notices', $this->_id, $network_level_or_blog_id );

            if ( is_multisite() ) {
                $this->_is_network_notices = ( true === $network_level_or_blog_id );

                if ( is_numeric( $network_level_or_blog_id ) ) {
                    $this->_blog_id = $network_level_or_blog_id;
                }
            } else {
                $this->_is_network_notices = false;
            }

            $is_network_admin = fs_is_network_admin();
            $is_blog_admin    = fs_is_blog_admin();

            if ( ( $this->_is_network_notices && $is_network_admin ) ||
                 ( ! $this->_is_network_notices && $is_blog_admin ) ||
                ( $is_network_and_blog_admins && ( $is_network_admin || $is_blog_admin ) )
            ) {
                if ( 0 < count( $this->_sticky_storage ) ) {
                    $ajax_action_suffix = str_replace( ':', '-', $this->_id );

                    // If there are sticky notices for the current slug, add a callback
                    // to the AJAX action that handles message dismiss.
                    add_action( "wp_ajax_fs_dismiss_notice_action_{$ajax_action_suffix}", array(
                        &$this,
                        'dismiss_notice_ajax_callback'
                    ) );

                    foreach ( $this->_sticky_storage as $msg ) {
                        // Add admin notice.
                        $this->add(
                            $msg['message'],
                            $msg['title'],
                            $msg['type'],
                            true,
                            $msg['id'],
                            false,
                            isset( $msg['wp_user_id'] ) ? $msg['wp_user_id'] : null,
                            ! empty( $msg['plugin'] ) ? $msg['plugin'] : null,
                            $is_network_and_blog_admins,
                            isset( $msg['dismissible'] ) ?
                                $msg['dismissible'] :
                                null
                        );
                    }
                }
            }
        }

        /**
         * Remove sticky message by ID.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         *
         */
        function dismiss_notice_ajax_callback() {
            check_admin_referer( 'fs_dismiss_notice_action' );

            if ( ! is_numeric( $_POST['message_id'] ) ) {
                $this->_sticky_storage->remove( $_POST['message_id'] );
            }

            wp_die();
        }

        /**
         * Rendered sticky message dismiss JavaScript.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         */
        static function _add_sticky_dismiss_javascript() {
            $params = array();
            fs_require_once_template( 'sticky-admin-notice-js.php', $params );
        }

        private static $_added_sticky_javascript = false;

        /**
         * Hook to the admin_footer to add sticky message dismiss JavaScript handler.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         */
        private static function has_sticky_messages() {
            if ( ! self::$_added_sticky_javascript ) {
                add_action( 'admin_footer', array( 'FS_Admin_Notice_Manager', '_add_sticky_dismiss_javascript' ) );
            }
        }

        /**
         * Handle admin_notices by printing the admin messages stacked in the queue.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.4
         *
         */
        function _admin_notices_hook() {
            if ( function_exists( 'current_user_can' ) &&
                 ! current_user_can( 'manage_options' )
            ) {
                // Only show messages to admins.
                return;
            }

            foreach ( $this->_notices as $id => $msg ) {
                if ( isset( $msg['wp_user_id'] ) && is_numeric( $msg['wp_user_id'] ) ) {
                    if ( get_current_user_id() != $msg['wp_user_id'] ) {
                        continue;
                    }
                }

                /**
                 * Added a filter to control the visibility of admin notices.
                 *
                 * Usage example:
                 *
                 *     /**
                 *      * @param bool  $show
                 *      * @param array $msg {
                 *      *     @var string $message The actual message.
                 *      *     @var string $title An optional message title.
                 *      *     @var string $type The type of the message ('success', 'update', 'warning', 'promotion').
                 *      *     @var string $id The unique identifier of the message.
                 *      *     @var string $manager_id The unique identifier of the notices manager. For plugins it would be the plugin's slug, for themes - `<slug>-theme`.
                 *      *     @var string $plugin The product's title.
                 *      *     @var string $wp_user_id An optional WP user ID that this admin notice is for.
                 *      * }
                 *      *
                 *      * @return bool
                 *      *\/
                 *      function my_custom_show_admin_notice( $show, $msg ) {
                 *          if ('trial_promotion' != $msg['id']) {
                 *              return false;
                 *          }
                 *
                 *          return $show;
                 *      }
                 *
                 *      my_fs()->add_filter( 'show_admin_notice', 'my_custom_show_admin_notice', 10, 2 );
                 *
                 * @author Vova Feldman
                 * @since 2.2.0
                 */
                $show_notice = call_user_func_array( 'fs_apply_filter', array(
                    $this->_module_unique_affix,
                    'show_admin_notice',
                    $this->show_admin_notices(),
                    $msg
                ) );

                if ( true !== $show_notice ) {
                    continue;
                }

                fs_require_template( 'admin-notice.php', $msg );

                if ( $msg['sticky'] ) {
                    self::has_sticky_messages();
                }
            }
        }

        /**
         * Enqueue common stylesheet to style admin notice.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         */
        function _enqueue_styles() {
            fs_enqueue_local_style( 'fs_common', '/admin/common.css' );
        }

        /**
         * Check if the current page is the Gutenberg block editor.
         *
         * @author Vova Feldman (@svovaf)
         * @since  2.2.3
         *
         * @return bool
         */
        function is_gutenberg_page() {
            if ( function_exists( 'is_gutenberg_page' ) &&
                 is_gutenberg_page()
            ) {
                // The Gutenberg plugin is on.
                return true;
            }

            $current_screen = get_current_screen();

            if ( method_exists( $current_screen, 'is_block_editor' ) &&
                 $current_screen->is_block_editor()
            ) {
                // Gutenberg page on 5+.
                return true;
            }

            return false;
        }

        /**
         * Check if admin notices should be shown on page. E.g., we don't want to show notices in the Visual Editor.
         *
         * @author Xiaheng Chen (@xhchen)
         * @since  2.4.2
         *
         * @return bool
         */
        function show_admin_notices() {
            global $pagenow;

            if ( 'about.php' === $pagenow ) {
                // Don't show admin notices on the About page.
                return false;
            }

            if ( $this->is_gutenberg_page() ) {
                // Don't show admin notices in Gutenberg (visual editor).
                return false;
            }

            return true;
        }

        /**
         * Add admin message to admin messages queue, and hook to admin_notices / all_admin_notices if not yet hooked.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.4
         *
         * @param string      $message
         * @param string      $title
         * @param string      $type
         * @param bool        $is_sticky
         * @param string      $id Message ID
         * @param bool        $store_if_sticky
         * @param number|null $wp_user_id
         * @param string|null $plugin_title
         * @param bool        $is_network_and_blog_admins Whether or not the message should be shown both on network
         *                                                and blog admin pages.
         * @param bool|null   $is_dismissible
         * @param array       $data
         *
         * @uses   add_action()
         */
        function add(
            $message,
            $title = '',
            $type = 'success',
            $is_sticky = false,
            $id = '',
            $store_if_sticky = true,
            $wp_user_id = null,
            $plugin_title = null,
            $is_network_and_blog_admins = false,
            $is_dismissible = null,
            $data = array()
        ) {
            $notices_type = $this->get_notices_type();

            if ( empty( $this->_notices ) ) {
                if ( ! $is_network_and_blog_admins ) {
                    add_action( $notices_type, array( &$this, "_admin_notices_hook" ) );
                } else {
                    add_action( 'network_admin_notices', array( &$this, "_admin_notices_hook" ) );
                    add_action( 'admin_notices', array( &$this, "_admin_notices_hook" ) );
                }

                add_action( 'admin_enqueue_scripts', array( &$this, '_enqueue_styles' ) );
            }

            if ( '' === $id ) {
                $id = md5( $title . ' ' . $message . ' ' . $type );
            }

            $message_object = array(
                'message'     => $message,
                'title'       => $title,
                'type'        => $type,
                'sticky'      => $is_sticky,
                'id'          => $id,
                'manager_id'  => $this->_id,
                'plugin'      => ( ! is_null( $plugin_title ) ? $plugin_title : $this->_title ),
                'wp_user_id'  => $wp_user_id,
                'dismissible' => $is_dismissible,
                'data'        => $data
            );

            if ( $is_sticky && $store_if_sticky ) {
                $this->_sticky_storage->{$id} = $message_object;
            }

            $this->_notices[ $id ] = $message_object;
        }

        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         *
         * @param string|string[] $ids
         * @param bool            $store
         */
        function remove_sticky( $ids, $store = true ) {
            if ( ! is_array( $ids ) ) {
                $ids = array( $ids );
            }

            foreach ( $ids as $id ) {
                // Remove from sticky storage.
                $this->_sticky_storage->remove( $id, $store );

                if ( isset( $this->_notices[ $id ] ) ) {
                    unset( $this->_notices[ $id ] );
                }
            }
        }

        /**
         * Check if sticky message exists by id.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.9
         *
         * @param $id
         *
         * @return bool
         */
        function has_sticky( $id ) {
            return isset( $this->_sticky_storage[ $id ] );
        }

        /**
         * Adds sticky admin notification.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.7
         *
         * @param string      $message
         * @param string      $id Message ID
         * @param string      $title
         * @param string      $type
         * @param number|null $wp_user_id
         * @param string|null $plugin_title
         * @param bool        $is_network_and_blog_admins Whether or not the message should be shown both on network
         *                                                and blog admin pages.
         * @param bool        $is_dimissible
         * @param array       $data
         */
        function add_sticky( $message, $id, $title = '', $type = 'success', $wp_user_id = null, $plugin_title = null, $is_network_and_blog_admins = false, $is_dimissible = true, $data = array() ) {
            if ( ! empty( $this->_module_unique_affix ) ) {
                $message = fs_apply_filter( $this->_module_unique_affix, "sticky_message_{$id}", $message );
                $title   = fs_apply_filter( $this->_module_unique_affix, "sticky_title_{$id}", $title );
            }

            $this->add( $message, $title, $type, true, $id, true, $wp_user_id, $plugin_title, $is_network_and_blog_admins, $is_dimissible, $data );
        }

        /**
         * Retrieves the data of an sticky notice.
         *
         * @author Leo Fajardo (@leorw)
         * @since  2.4.3
         *
         * @param string $id Message ID.
         *
         * @return array|null
         */
        function get_sticky( $id ) {
            return isset( $this->_sticky_storage->{$id} ) ?
                $this->_sticky_storage->{$id} :
                null;
        }

        /**
         * Clear all sticky messages.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.8
         */
        function clear_all_sticky() {
            $this->_sticky_storage->clear_all();
        }

        #--------------------------------------------------------------------------------
        #region Helper Method
        #--------------------------------------------------------------------------------

        /**
         * @author Vova Feldman (@svovaf)
         * @since  2.0.0
         *
         * @return string
         */
        private function get_notices_type() {
            return $this->_is_network_notices ?
                'network_admin_notices' :
                'admin_notices';
        }

        #endregion
    }
