<?php
/**
 * Dedicated Gutenberg Disabler
 *
 * This file contains a dedicated class for completely disabling the Gutenberg editor
 * in WordPress. It uses multiple approaches including a direct hook in the init process.
 *
 * @package AboveWP_Tweaks_Optimizer
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

class AboveWP_Gutenberg_Disabler {
    /**
     * Setup hooks to disable Gutenberg
     */
    public static function init() {
        // Run as early as possible
        add_action('init', array(__CLASS__, 'disable_gutenberg_early'), 1);
        
        // Run at normal priority
        add_action('init', array(__CLASS__, 'disable_gutenberg'), 10);
        
        // Run very late in case other plugins try to re-enable
        add_action('init', array(__CLASS__, 'disable_gutenberg_late'), 999);
        
        // Show admin notice if Classic Editor isn't active
        add_action('admin_notices', array(__CLASS__, 'classic_editor_notice'));
        
        // Add force redirect on edit screens
        add_action('load-edit.php', array(__CLASS__, 'redirect_to_classic_list'));
        add_action('load-post.php', array(__CLASS__, 'redirect_to_classic_editor'));
        add_action('load-post-new.php', array(__CLASS__, 'redirect_to_classic_editor'));
        
        // Set up extra hooks
        self::setup_additional_hooks();
    }
    
    /**
     * Disable Gutenberg at the earliest possible point
     */
    public static function disable_gutenberg_early() {
        // Disable Gutenberg completely
        // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedConstantFound -- Third-party constant used by Gutenberg plugin.
        if (!defined('GUTENBERG_USE_CLASSIC')) {
            define('GUTENBERG_USE_CLASSIC', true);
        }

        // Allow Classic Editor to take over if it's active
        // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedConstantFound -- Third-party constant used by Classic Editor plugin.
        if (!defined('CLASSIC_EDITOR_REPLACE')) {
            define('CLASSIC_EDITOR_REPLACE', 'classic');
        }
        
        // Disable direct loading of block editor for all post types
        add_filter('use_block_editor_for_post_type', '__return_false', 999);
        add_filter('gutenberg_can_edit_post_type', '__return_false', 999);
    }
    
    /**
     * Main disabling function with multiple approaches
     */
    public static function disable_gutenberg() {
        // Completely disable Gutenberg
        add_filter('use_block_editor_for_post', '__return_false', 999);
        add_filter('use_block_editor_for_post_type', '__return_false', 999);
        add_filter('gutenberg_can_edit_post', '__return_false', 999);
        add_filter('gutenberg_can_edit_post_type', '__return_false', 999);
        
        // Disable Gutenberg for each post type individually (belt and suspenders)
        foreach (get_post_types() as $post_type) {
            add_filter("use_block_editor_for_post_type_{$post_type}", '__return_false', 999);
            add_filter("gutenberg_can_edit_post_type_{$post_type}", '__return_false', 999);
        }
        
        // Remove Gutenberg action hooks
        remove_action('admin_menu', 'gutenberg_menu');
        remove_action('admin_init', 'gutenberg_redirect_demo');
        
        // Remove Gutenberg widgets
        add_filter('gutenberg_use_widgets_block_editor', '__return_false', 999);
        add_filter('use_widgets_block_editor', '__return_false', 999);
        
        // Disable theme supports
        remove_theme_support('widgets-block-editor');
        remove_theme_support('block-templates');
        
        // Remove Gutenberg styles
        self::remove_block_styles();
    }
    
    /**
     * Final disabling pass - very late in the init process
     */
    public static function disable_gutenberg_late() {
        // Double check post types
        foreach (get_post_types() as $post_type) {
            remove_post_type_support($post_type, 'editor');
            add_post_type_support($post_type, 'editor');
        }
        
        // Ensure admin bar doesn't have Gutenberg items
        remove_action('admin_bar_menu', 'wp_admin_bar_gutenberg_menu', 999);
    }
    
    /**
     * Setup additional hooks to disable Gutenberg
     */
    public static function setup_additional_hooks() {
        // Force classic editor for all posts
        add_filter('replace_editor', function($replace, $post) {
            return 'classic';
        }, 999, 2);
        
        // Remove Gutenberg styles and scripts (admin only — preserve frontend block CSS)
        add_action('admin_enqueue_scripts', array(__CLASS__, 'remove_block_assets'), 999);
        add_action('enqueue_block_editor_assets', array(__CLASS__, 'remove_block_editor_assets'), 999);
        
        // Add custom CSS to hide block editor related UI elements
        add_action('admin_enqueue_scripts', array(__CLASS__, 'add_hide_gutenberg_css'));
        
        // Detect if we're still in block editor and redirect
        add_action('current_screen', array(__CLASS__, 'redirect_if_block_editor'));
    }
    
    /**
     * Remove block assets
     */
    public static function remove_block_assets() {
        // WordPress core block styles
        wp_dequeue_style('wp-block-library');
        wp_dequeue_style('wp-block-library-theme');
        wp_dequeue_style('wp-block-editor');
        wp_dequeue_style('wp-block-library-editor');
        wp_dequeue_style('wp-edit-blocks');
        wp_dequeue_style('global-styles');
        wp_dequeue_style('classic-theme-styles');
        
        // WooCommerce block styles
        wp_dequeue_style('wc-blocks-style');
        wp_dequeue_style('wc-blocks-editor-style');
        
        // Gutenberg scripts
        wp_dequeue_script('wp-block-editor');
        wp_dequeue_script('wp-block-library');
        wp_dequeue_script('wp-blocks');
        wp_dequeue_script('wp-components');
        wp_dequeue_script('wp-editor');
        wp_dequeue_script('wp-edit-post');
        wp_dequeue_script('wp-element');
        
        // Deregister completely, not just dequeue
        wp_deregister_style('wp-block-library');
        wp_deregister_style('wp-block-library-theme');
        wp_deregister_style('global-styles');
        wp_deregister_script('wp-block-editor');
        wp_deregister_script('wp-blocks');
    }
    
    /**
     * Remove block editor specific assets
     */
    public static function remove_block_editor_assets() {
        // Get all scripts
        global $wp_scripts;
        
        // Identify and remove scripts with 'block' or 'gutenberg' in name
        if (isset($wp_scripts->registered) && is_array($wp_scripts->registered)) {
            foreach ($wp_scripts->registered as $script) {
                if (!isset($script->handle)) continue;
                
                if (strpos($script->handle, 'block') !== false || strpos($script->handle, 'gutenberg') !== false) {
                    wp_dequeue_script($script->handle);
                    wp_deregister_script($script->handle);
                }
            }
        }
        
        // Block the editor completely by returning true
        return true;
    }
    
    /**
     * Show an admin notice suggesting Classic Editor installation
     */
    public static function classic_editor_notice() {
        if (!function_exists('classic_editor_init') && current_user_can('install_plugins')) {
            // Check if we're on a post edit screen
            $screen = get_current_screen();
            if (($screen->base === 'post' || $screen->base === 'edit') && $screen->is_block_editor()) {
                ?>
                <div class="notice notice-error">
                    <p><strong>AboveWP Tweaks Optimizer:</strong> Gutenberg is still appearing despite our attempts to disable it. Please <a href="<?php echo esc_url(admin_url('plugin-install.php?s=classic-editor&tab=search&type=term')); ?>">install and activate the Classic Editor plugin</a> for the best results.</p>
                </div>
                <?php
            }
        }
    }
    
    /**
     * Redirect from post list to classic post list
     */
    public static function redirect_to_classic_list() {
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Checking query params for redirect, no data processing.
        if (!isset($_GET['classic-editor']) && !isset($_GET['classic-editor-remember'])) {
            if (!isset($_SERVER['REQUEST_URI'])) {
                return;
            }
            $uri = sanitize_text_field(wp_unslash($_SERVER['REQUEST_URI']));
            if (strpos($uri, '?') !== false) {
                $uri .= '&classic-editor=classic-editor&classic-editor-remember=classic-editor';
            } else {
                $uri .= '?classic-editor=classic-editor&classic-editor-remember=classic-editor';
            }
            wp_safe_redirect($uri);
            exit;
        }
    }

    /**
     * Redirect to classic editor from any block editor
     */
    public static function redirect_to_classic_editor() {
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Checking query param for redirect, no data processing.
        if (!isset($_GET['classic-editor'])) {
            if (!isset($_SERVER['REQUEST_URI'])) {
                return;
            }
            $uri = sanitize_text_field(wp_unslash($_SERVER['REQUEST_URI']));
            if (strpos($uri, '?') !== false) {
                $uri .= '&classic-editor';
            } else {
                $uri .= '?classic-editor';
            }
            wp_safe_redirect($uri);
            exit;
        }
    }

    /**
     * Emergency redirect if we somehow still end up in block editor
     */
    public static function redirect_if_block_editor($screen) {
        if (is_object($screen) && method_exists($screen, 'is_block_editor') && $screen->is_block_editor()) {
            if (isset($_SERVER['REQUEST_URI'])) {
                $uri = sanitize_text_field(wp_unslash($_SERVER['REQUEST_URI']));
                if (strpos($uri, 'classic-editor') === false) {
                    if (strpos($uri, '?') !== false) {
                        $uri .= '&classic-editor';
                    } else {
                        $uri .= '?classic-editor';
                    }
                    wp_safe_redirect($uri);
                    exit;
                }
            }
        }
    }
    
    /**
     * Add CSS to hide any remaining Gutenberg UI
     */
    public static function add_hide_gutenberg_css() {
        $css = '/* Hide Gutenberg UI elements */
        .edit-post-header,
        .edit-post-sidebar,
        .edit-post-layout__content,
        .edit-post-visual-editor,
        .editor-post-title,
        .block-editor-writing-flow,
        .block-editor-block-list__layout,
        .components-notice-list,
        .components-editor-notices__dismissible,
        .components-editor-notices__pinned,
        .block-editor,
        .edit-post-layout {
            display: none !important;
        }

        /* Hide Gutenberg settings */
        .option-site-editor-menu {
            display: none !important;
        }

        /* Hide Gutenberg menu items */
        #menu-appearance .wp-submenu li a[href="site-editor.php"],
        #wp-admin-bar-site-editor {
            display: none !important;
        }';
        wp_register_style('abovewp-disable-gutenberg', false, array(), ABOVEWP_TWEAKS_VERSION);
        wp_enqueue_style('abovewp-disable-gutenberg');
        wp_add_inline_style('abovewp-disable-gutenberg', $css);
    }
    
    /**
     * Remove block styles from frontend
     */
    public static function remove_block_styles() {
        // Remove block styles in admin only — preserve frontend block CSS
        add_action('wp_print_styles', function() {
            if (!is_admin()) {
                return;
            }
            wp_dequeue_style('wp-block-library');
            wp_dequeue_style('wp-block-library-theme');
            wp_dequeue_style('wc-blocks-style');
            wp_dequeue_style('global-styles');
            wp_dequeue_style('classic-theme-styles');
        }, 100);
    }
}

// Autoload the class
add_action('plugins_loaded', array('AboveWP_Gutenberg_Disabler', 'init'), 5);