<?php
/**
 * Block Checkout Field Ordering - FIXED (No Infinite Loop)
 */

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

class CFEP_Block_Checkout_Field_Ordering {
    
    private static $instance = null;
    
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    private function __construct() {
        add_action('wp_enqueue_scripts', array($this, 'enqueue_reorder_script'));
    }
    
    public function enqueue_reorder_script() {
        if (!is_checkout()) {
            return;
        }
        
        global $wpdb;
        $table_name = $wpdb->prefix . 'cfep_block_fields';
        
        // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.NotPrepared, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, PluginCheck.Security.DirectDB.UnescapedDBParameter
        if ($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) {
            return;
        }
        
        $cache_key = 'cfep_block_field_positions';
        $fields = wp_cache_get($cache_key, 'cfep');
        if ($fields === false) {
            // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.NotPrepared, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, PluginCheck.Security.DirectDB.UnescapedDBParameter
            $fields = $wpdb->get_results( "SELECT field_key, position, location FROM {$table_name} WHERE enabled = 1 ORDER BY position ASC" );
            wp_cache_set($cache_key, $fields, 'cfep', 300);
        }
        
        if (empty($fields)) {
            return;
        }
        
        $field_positions = array();
        foreach ($fields as $field) {
            // Store multiple variations
            $field_positions[$field->field_key] = (int) $field->position;
            
            // Also store without prefix for matching
            $clean_key = preg_replace('/^(billing|shipping|contact)_/', '', $field->field_key);
            $field_positions[$clean_key] = (int) $field->position;
        }
        
        wp_add_inline_script('wp-hooks', "
        (function() {
            const fieldPositions = " . wp_json_encode( $field_positions ) . ";
            const processedContainers = new WeakSet(); // Track processed containers
            
            function reorderContainer(container, containerName) {
                if (!container) {
                    return false;
                }
                
                // Skip if already processed
                if (processedContainers.has(container)) {
                    return false;
                }
                
                console.log('CFEP: Processing', containerName);
                
                const children = Array.from(container.children);
                const fieldsWithPosition = [];
                
                children.forEach((child, index) => {
                    let fieldKey = null;
                    let position = index * 100;
                    
                    const input = child.querySelector('input, select, textarea');
                    if (input) {
                        // Get field key from name or id
                        fieldKey = input.name || input.id;
                        
                        if (fieldKey) {
                            // Try multiple key variations
                            let foundPosition = null;
                            
                            // Try exact match
                            if (fieldPositions[fieldKey]) {
                                foundPosition = fieldPositions[fieldKey];
                            }
                            
                            // Try without namespace (e.g., 'contact-cfep/xyz' -> 'xyz')
                            if (!foundPosition) {
                                const withoutNamespace = fieldKey.replace(/^[a-z]+[-_]cfep\\//, '');
                                if (fieldPositions[withoutNamespace]) {
                                    foundPosition = fieldPositions[withoutNamespace];
                                    fieldKey = withoutNamespace;
                                }
                            }
                            
                            // Try without prefix (e.g., 'shipping_city' -> 'city')
                            if (!foundPosition) {
                                const withoutPrefix = fieldKey.replace(/^(billing|shipping|contact)[-_]/, '');
                                if (fieldPositions[withoutPrefix]) {
                                    foundPosition = fieldPositions[withoutPrefix];
                                    fieldKey = withoutPrefix;
                                }
                            }
                            
                            if (foundPosition) {
                                position = foundPosition;
                                console.log('  ✓ Position', position, 'for', fieldKey);
                            }
                        }
                    }
                    
                    fieldsWithPosition.push({
                        element: child,
                        position: position,
                        key: fieldKey || 'unknown-' + index
                    });
                });
                
                // Sort by position
                fieldsWithPosition.sort((a, b) => a.position - b.position);
                
                // Reorder
                fieldsWithPosition.forEach(item => {
                    container.appendChild(item.element);
                });
                
                // Mark as processed
                processedContainers.add(container);
                console.log('CFEP: ✓ Done -', containerName);
                
                return true;
            }
            
            function reorderAll() {
                let processed = 0;
                
                // Contact section
                const contactFieldset = document.querySelector('.wc-block-checkout__contact-fields fieldset');
                if (contactFieldset && reorderContainer(contactFieldset, 'contact')) {
                    processed++;
                }
                
                // Shipping address
                const shippingForms = document.querySelectorAll('.wc-block-components-address-form');
                shippingForms.forEach((form, idx) => {
                    if (reorderContainer(form, 'address-form-' + idx)) {
                        processed++;
                    }
                });
                
                return processed > 0;
            }
            
            // Try multiple times with delays
            let attempts = 0;
            const maxAttempts = 5;
            
            function tryReorder() {
                attempts++;
                const success = reorderAll();
                
                if (success) {
                    console.log('CFEP: Reordering successful!');
                } else if (attempts < maxAttempts) {
                    console.log('CFEP: Retry', attempts, 'of', maxAttempts);
                    setTimeout(tryReorder, 500);
                }
            }
            
            // Start after DOM is ready
            if (document.readyState === 'loading') {
                document.addEventListener('DOMContentLoaded', () => setTimeout(tryReorder, 100));
            } else {
                setTimeout(tryReorder, 100);
            }
        })();
        ");
    }
}