<?php
/**
 * Gutenberg Block Registration
 * Registers the GitHub Code Viewer block for the block editor
 */

// Prevent direct access
if (!defined('WPINC')) {
    die('Direct access not permitted.');
}

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

class MCB_Block_Editor {
    
    /**
     * Initialize block editor support
     */
    public static function init() {
        // Check if Gutenberg is available
        if (!function_exists('register_block_type')) {
            return;
        }
        
        add_action('init', array(__CLASS__, 'register_block'));
        add_action('enqueue_block_editor_assets', array(__CLASS__, 'enqueue_block_editor_assets'));
        add_action('enqueue_block_assets', array(__CLASS__, 'enqueue_block_assets'));
        add_filter('block_categories_all', array(__CLASS__, 'add_block_category'), 10, 2);
    }
    
    /**
     * Register the block
     */
    public static function register_block() {
        // Debug: Log that we're attempting to register
        error_log('MCB: Attempting to register block');
        
        // Register block editor script
        wp_register_script(
            'mcb-block-editor',
            MCB_PLUGIN_URL . 'assets/js/block-editor.js',
            array('wp-blocks', 'wp-element', 'wp-editor', 'wp-components', 'wp-i18n', 'wp-data'),
            MCB_PLUGIN_VERSION,
            true
        );
        
        // Register block editor styles
        wp_register_style(
            'mcb-block-editor-style',
            MCB_PLUGIN_URL . 'assets/css/block-editor.css',
            array('wp-edit-blocks'),
            MCB_PLUGIN_VERSION
        );
        
        // Register the block with simplified attributes first
        $result = register_block_type('maple-code-blocks/code-block', array(
            'editor_script' => 'mcb-block-editor',
            'editor_style' => 'mcb-block-editor-style',
            'render_callback' => array(__CLASS__, 'render_block'),
            'attributes' => array(
                'repository' => array(
                    'type' => 'string',
                    'default' => ''
                ),
                'theme' => array(
                    'type' => 'string',
                    'default' => 'dark'
                ),
                'height' => array(
                    'type' => 'string',
                    'default' => '600px'
                ),
                'showLineNumbers' => array(
                    'type' => 'boolean',
                    'default' => true
                ),
                'initialFile' => array(
                    'type' => 'string',
                    'default' => ''
                ),
                'title' => array(
                    'type' => 'string',
                    'default' => ''
                ),
                'align' => array(
                    'type' => 'string',
                    'default' => 'none'
                ),
                'className' => array(
                    'type' => 'string',
                    'default' => ''
                )
            ),
            'supports' => array(
                'align' => array('wide', 'full'),
                'className' => true,
                'customClassName' => true,
                'html' => false,
                'anchor' => true
            ),
            'example' => array(
                'attributes' => array(
                    'repository' => 'facebook/react',
                    'theme' => 'dark',
                    'height' => '400px',
                    'title' => 'React Source Code Example'
                )
            )
        ));
        
        // Add block variations
        wp_register_script(
            'mcb-block-variations',
            MCB_PLUGIN_URL . 'assets/js/block-variations.js',
            array('wp-blocks', 'wp-dom-ready'),
            MCB_PLUGIN_VERSION,
            true
        );
        
        wp_enqueue_script('mcb-block-variations');
    }
    
    /**
     * Render the block on the frontend
     */
    public static function render_block($attributes, $content) {
        // Validate required attributes
        if (empty($attributes['repository'])) {
            return '<div class="mcb-error">Please specify a repository (e.g., owner/repository)</div>';
        }
        
        // Sanitize attributes
        $repository = sanitize_text_field($attributes['repository']);
        
        // Validate repository format
        if (!MCB_Security::validate_repo_format($repository)) {
            return '<div class="mcb-error">Invalid repository format. Use: owner/repository</div>';
        }
        
        // Build shortcode attributes
        $shortcode_atts = array(
            'repo' => $repository,
            'theme' => sanitize_text_field($attributes['theme'] ?? 'dark'),
            'height' => sanitize_text_field($attributes['height'] ?? '600px'),
            'show_line_numbers' => $attributes['showLineNumbers'] ? 'true' : 'false',
            'initial_file' => sanitize_text_field($attributes['initialFile'] ?? ''),
            'title' => sanitize_text_field($attributes['title'] ?? '')
        );
        
        // Add alignment class if needed
        $wrapper_class = 'mcb-block-wrapper';
        if (!empty($attributes['align'])) {
            $wrapper_class .= ' align' . esc_attr($attributes['align']);
        }
        if (!empty($attributes['className'])) {
            $wrapper_class .= ' ' . esc_attr($attributes['className']);
        }
        
        // Generate shortcode
        $shortcode = '[maple_code_block';
        foreach ($shortcode_atts as $key => $value) {
            if (!empty($value)) {
                $shortcode .= ' ' . $key . '="' . esc_attr($value) . '"';
            }
        }
        $shortcode .= ']';
        
        // Render with wrapper
        return sprintf(
            '<div class="%s">%s</div>',
            esc_attr($wrapper_class),
            do_shortcode($shortcode)
        );
    }
    
    /**
     * Enqueue block editor assets
     */
    public static function enqueue_block_editor_assets() {
        // Debug log
        error_log('MCB: Enqueueing block editor assets');
        
        // Make sure our script is registered
        if (!wp_script_is('mcb-block-editor', 'registered')) {
            error_log('MCB: Script not registered, registering now');
            wp_register_script(
                'mcb-block-editor',
                MCB_PLUGIN_URL . 'assets/js/block-editor.js',
                array('wp-blocks', 'wp-element', 'wp-editor', 'wp-components', 'wp-i18n', 'wp-data'),
                MCB_PLUGIN_VERSION,
                true
            );
        }
        
        // Localize script with data for the editor
        wp_localize_script('mcb-block-editor', 'mcbBlockData', array(
            'pluginUrl' => MCB_PLUGIN_URL,
            'themes' => array(
                array('label' => 'Dark', 'value' => 'dark'),
                array('label' => 'Light', 'value' => 'light'),
                array('label' => 'Monokai', 'value' => 'monokai'),
                array('label' => 'Solarized', 'value' => 'solarized')
            ),
            'defaultHeight' => '600px',
            'popularRepos' => array(
                'facebook/react',
                'vuejs/vue',
                'angular/angular',
                'microsoft/vscode',
                'torvalds/linux',
                'tensorflow/tensorflow',
                'kubernetes/kubernetes',
                'nodejs/node',
                'rust-lang/rust',
                'golang/go'
            ),
            'nonce' => wp_create_nonce('mcb_block_nonce')
        ));
    }
    
    /**
     * Enqueue frontend block assets
     */
    public static function enqueue_block_assets() {
        // Only enqueue on frontend
        if (!is_admin()) {
            // These will be enqueued by the shortcode handler
            // We just need to ensure the block wrapper styles are loaded
            wp_enqueue_style(
                'mcb-block-style',
                MCB_PLUGIN_URL . 'assets/css/block-style.css',
                array(),
                MCB_PLUGIN_VERSION
            );
        }
    }
    
    /**
     * Add custom block category
     */
    public static function add_block_category($categories, $post) {
        return array_merge(
            array(
                array(
                    'slug' => 'maple-code-blocks',
                    'title' => __('Maple Code Blocks', 'maple-code-blocks'),
                    'icon' => 'editor-code'
                )
            ),
            $categories
        );
    }
    
    /**
     * Register REST API endpoint for repository validation
     */
    public static function register_rest_routes() {
        register_rest_route('maple-code-blocks/v1', '/validate-repo', array(
            'methods' => 'POST',
            'callback' => array(__CLASS__, 'validate_repository'),
            'permission_callback' => function() {
                return current_user_can('edit_posts');
            },
            'args' => array(
                'repository' => array(
                    'required' => true,
                    'type' => 'string',
                    'sanitize_callback' => 'sanitize_text_field'
                )
            )
        ));
        
        register_rest_route('maple-code-blocks/v1', '/get-files', array(
            'methods' => 'POST',
            'callback' => array(__CLASS__, 'get_repository_files'),
            'permission_callback' => function() {
                return current_user_can('edit_posts');
            },
            'args' => array(
                'repository' => array(
                    'required' => true,
                    'type' => 'string',
                    'sanitize_callback' => 'sanitize_text_field'
                )
            )
        ));
    }
    
    /**
     * Validate repository via REST API
     */
    public static function validate_repository($request) {
        $repository = $request->get_param('repository');
        
        // Validate format
        if (!MCB_Security::validate_repo_format($repository)) {
            return new WP_Error('invalid_format', 'Invalid repository format. Use: owner/repository');
        }
        
        // Quick check with GitHub API
        $github_api = new MCB_GitHub_API();
        $result = $github_api->validate_repository_exists($repository);
        
        if (is_wp_error($result)) {
            return $result;
        }
        
        return array(
            'valid' => true,
            'repository' => $repository
        );
    }
    
    /**
     * Get repository files for block editor preview
     */
    public static function get_repository_files($request) {
        $repository = $request->get_param('repository');
        
        // Validate format
        if (!MCB_Security::validate_repo_format($repository)) {
            return new WP_Error('invalid_format', 'Invalid repository format');
        }
        
        $github_api = new MCB_GitHub_API();
        $files = $github_api->get_repository_files($repository);
        
        if (is_wp_error($files)) {
            return $files;
        }
        
        // Return only file names for the editor
        $file_list = array_map(function($file) {
            return array(
                'path' => $file['path'],
                'name' => $file['name']
            );
        }, array_slice($files, 0, 10)); // Limit to 10 files for preview
        
        return array(
            'files' => $file_list,
            'total' => count($files)
        );
    }
}

// Initialize block editor support
add_action('init', array('MCB_Block_Editor', 'init'));
add_action('rest_api_init', array('MCB_Block_Editor', 'register_rest_routes'));