<?php
/**
 * Basic Field Validator
 * Only handles required field validation
 * Advanced validation available in PRO version
 * 
 * @package Checkout_Field_Editor_Pro
 */

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

class CFEP_Validator {
    
    /**
     * Validate a single field (basic required check only)
     */
    public static function validate_field($field, $value) {
        // Only check if required
        if ($field['required'] && empty($value)) {
            return new WP_Error(
                'required', 
                sprintf(/* translators: %s: field label */ __('%s is required.', 'akz-checkout-fields-manager-for-woocommerce'), $field['label'])
            );
        }
        
        // Let WooCommerce and browser handle other validation (email, URL, number, etc.)
        return true;
    }
    
    /**
     * Validate all checkout fields
     */
    public static function validate_checkout_fields($data, $errors) {
        $field_manager = CFEP_Field_Manager::instance();
        $fields = $field_manager->get_all_fields(null, true);
        
        foreach ($fields as $field) {
            $value = isset($data[$field['field_key']]) ? $data[$field['field_key']] : '';
            
            // Check conditional logic
            if (self::should_display_field($field, $data)) {
                $result = self::validate_field($field, $value);
                
                if (is_wp_error($result)) {
                    $errors->add($field['field_key'], $result->get_error_message());
                }
            }
        }
    }
    
    /**
     * Check if field should be displayed based on conditional logic
     */
    private static function should_display_field($field, $data) {
        if (empty($field['conditional_logic'])) {
            return true;
        }
        
        $logic = $field['conditional_logic'];
        
        if (isset($logic['show_if'])) {
            $condition = $logic['show_if'];
            $compare_field = $condition['field'];
            $operator = $condition['operator'];
            $compare_value = $condition['value'];
            $current_value = isset($data[$compare_field]) ? $data[$compare_field] : '';
            
            switch ($operator) {
                case 'equals':
                    return $current_value == $compare_value;
                case 'not_equals':
                    return $current_value != $compare_value;
                case 'contains':
                    return strpos($current_value, $compare_value) !== false;
                default:
                    return true;
            }
        }
        
        return true;
    }
}