<?php
/**
 * CFEP Block Default Fields Visibility Manager
 * 
 * Hides WooCommerce default fields when disabled in admin
 * Since we can't prevent WooCommerce from registering them,
 * we hide them using CSS and validation filters.
 *
 * @package Checkout_Field_Editor_Pro
 */

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

class CFEP_Block_Default_Fields_Visibility {
    
    private static $instance = null;
    
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    private function __construct() {
        // Add CSS to hide disabled fields
        add_action('wp_enqueue_scripts', array($this, 'hide_disabled_fields_css'));
        
        // Make disabled fields not required
        add_filter('woocommerce_default_address_fields', array($this, 'modify_address_fields'), 999);
        add_filter('woocommerce_billing_fields', array($this, 'modify_billing_fields'), 999);
        add_filter('woocommerce_shipping_fields', array($this, 'modify_shipping_fields'), 999);
    }
    
    /**
     * Get disabled default fields from database
     */
    private function get_disabled_default_fields() {
        global $wpdb;
        $table = $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'") != $table) {
            return array();
        }
        
        $cache_key = 'cfep_disabled_default_fields';
        $results = wp_cache_get($cache_key, 'cfep');
        if ($results === false) {
            // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.NotPrepared, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, PluginCheck.Security.DirectDB.UnescapedDBParameter
            $results = $wpdb->get_results( "SELECT field_key FROM $table WHERE is_default = 1 AND enabled = 0", ARRAY_A );
            wp_cache_set($cache_key, $results, 'cfep', 300);
        }
        
        $disabled = array();
        foreach ($results as $row) {
            $disabled[] = $row['field_key'];
        }
        
        return $disabled;
    }
    
    /**
     * Add CSS to hide disabled fields
     */
    public function hide_disabled_fields_css() {
        if (!is_checkout()) {
            return;
        }
        
        $disabled_fields = $this->get_disabled_default_fields();
        
        if (empty($disabled_fields)) {
            return;
        }
        
        // Generate CSS selectors for Block Checkout
        $selectors = array();
        
        foreach ($disabled_fields as $field_key) {
            // Map field_key to actual CSS class
            $base_key = str_replace(array('billing_', 'shipping_'), '', $field_key);
            
            // Hide the field wrapper
            $selectors[] = '.wc-block-components-address-form__' . $base_key;
            
            // Special case: address_2 has a toggle button that must also be hidden
            if ($base_key === 'address_2') {
                $selectors[] = '.wc-block-components-address-form__address_2-toggle';
            }
        }
        
        if (empty($selectors)) {
            return;
        }
        
        $css = implode(',', $selectors) . ' { display: none !important; }';

        wp_register_style( 'cfep-hidden-fields', false, array(), CFEP_VERSION ); // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
        wp_enqueue_style( 'cfep-hidden-fields' );
        wp_add_inline_style( 'cfep-hidden-fields', $css );
    }
    
    /**
     * Modify default address fields
     */
    public function modify_address_fields($fields) {
        $disabled_fields = $this->get_disabled_default_fields();
        
        foreach ($disabled_fields as $field_key) {
            // Remove prefix to get base field name
            $base_key = str_replace(array('billing_', 'shipping_'), '', $field_key);
            
            if (isset($fields[$base_key])) {
                // Don't remove, just mark as not required and hidden
                $fields[$base_key]['required'] = false;
                $fields[$base_key]['class'][] = 'cfep-hidden-field';
            }
        }
        
        return $fields;
    }
    
    /**
     * Modify billing fields
     */
    public function modify_billing_fields($fields) {
        $disabled_fields = $this->get_disabled_default_fields();
        
        foreach ($disabled_fields as $field_key) {
            if (strpos($field_key, 'billing_') === 0 && isset($fields[$field_key])) {
                $fields[$field_key]['required'] = false;
                $fields[$field_key]['class'][] = 'cfep-hidden-field';
            }
        }
        
        return $fields;
    }
    
    /**
     * Modify shipping fields
     */
    public function modify_shipping_fields($fields) {
        $disabled_fields = $this->get_disabled_default_fields();
        
        foreach ($disabled_fields as $field_key) {
            if (strpos($field_key, 'shipping_') === 0 && isset($fields[$field_key])) {
                $fields[$field_key]['required'] = false;
                $fields[$field_key]['class'][] = 'cfep-hidden-field';
            }
        }
        
        return $fields;
    }
}