<?php
/**
 * Block Checkout Integration - Controls Field Ordering
 * Uses WooCommerce AssetDataRegistry to inject field positions
 * This is the SECRET to reordering both default and custom fields!
 * 
 * @package Checkout_Field_Editor_Pro
 */

if (!defined('ABSPATH')) exit;

class CFEP_Block_Checkout_Integration {
    
    private static $instance = null;
    
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    private function __construct() {
        // Hook into WooCommerce Block Checkout data
        add_action('woocommerce_blocks_checkout_enqueue_data', array($this, 'inject_field_order'));
    }
    
    /**
     * Inject field order into Block Checkout
     * This is THE KEY to making reordering work!
     */
    public function inject_field_order() {
        if (!function_exists('wc_get_container')) {
            return;
        }
        
        try {
            // Get WooCommerce's AssetDataRegistry
            $asset_data_registry = wc_get_container()->get(\Automattic\WooCommerce\Blocks\Assets\AssetDataRegistry::class);
            
            if (!$asset_data_registry) {
                return;
            }
            
            // Get merged fields (default + custom) with positions
            $merged_fields = $this->get_merged_fields_with_positions();
            
            if (empty($merged_fields)) {
                return;
            }
            
            // THIS IS THE MAGIC! 
            // Inject field data into WooCommerce Block Checkout
            $asset_data_registry->add('checkoutFieldsPositions', $merged_fields);
            
            
        } catch (Exception $e) {
        }
    }
    
    /**
     * Get WooCommerce default fields merged with custom fields
     * All fields get their positions from the database
     */
    private function get_merged_fields_with_positions() {
        $block_manager = CFEP_Block_Field_Manager::instance();
        $all_fields = $block_manager->get_all_fields(null, true); // Only enabled
        
        $merged = array();
        
        foreach ($all_fields as $field) {
            $key = $field['field_key'];
            $position = (int)$field['position'];
            
            // Map location to WooCommerce format
            $location = $field['location'];
            if ($location === 'address') {
                $location = 'shipping'; // or 'billing'
            } elseif ($location === 'contact') {
                $location = 'contact';
            } else {
                $location = 'additional';
            }
            
            $merged[$key] = array(
                'key' => $key,
                'index' => $position, // THIS is what controls order!
                'location' => $location,
                'label' => $field['label'],
                'required' => (bool)$field['required'],
                'enabled' => (bool)$field['enabled'],
                'type' => $field['field_type'],
                'is_default' => isset($field['is_default']) ? (bool)$field['is_default'] : false
            );
        }
        
        // Sort by index
        uasort($merged, function($a, $b) {
            return $a['index'] - $b['index'];
        });
        
        return $merged;
    }
}