<?php
if (!defined('ABSPATH')) {
    exit;
}

class EnspirePlugins_ACFW_Validation {
    private $settings = array();
    private $custom_fields = array();

    public function __construct() {
        $this->load_settings();
        add_action('woocommerce_checkout_process', array($this, 'validate_custom_fields'));
    }

    private function load_settings() {
        $this->settings = get_option('enspireplugins_acfw_settings', array());
        $this->custom_fields = isset($this->settings['custom_fields']) ? $this->settings['custom_fields'] : array();
    }

    public function validate_custom_fields() {
        if (empty($this->custom_fields)) {
            return;
        }

        $active_fields = array_filter($this->custom_fields, function($field) {
            return isset($field['active']) && $field['active'] === 'yes';
        });

        if (empty($active_fields)) {
            return;
        }

        $valid = true;

        foreach ($active_fields as $field) {
            if ($field['type'] === 'heading') {
                continue;
            }

            $field_id = 'enspireplugins_acfw_' . $field['id'];
            $field_value = $this->get_field_value($field_id, $field['type']);
            
            if ($field['required'] === 'yes' && empty($field_value)) {
                wc_add_notice(
                    sprintf(
                        /* translators: %s: field label */
                        esc_html__('%s is a required field.', 'additional-checkout-fields-for-woo'),
                        '<strong>' . esc_html($field['label']) . '</strong>'
                    ),
                    'error'
                );
                $valid = false;
            }

            if (!empty($field_value)) {
                switch ($field['type']) {
                    case 'email':
                        if (!is_email($field_value)) {
                            wc_add_notice(
                                sprintf(
                                    /* translators: %s: field label */
                                    esc_html__('%s must be a valid email address.', 'additional-checkout-fields-for-woo'),
                                    '<strong>' . esc_html($field['label']) . '</strong>'
                                ),
                                'error'
                            );
                            $valid = false;
                        }
                        break;

                    case 'url':
                        if (!filter_var($field_value, FILTER_VALIDATE_URL)) {
                            wc_add_notice(
                                sprintf(
                                    /* translators: %s: field label */
                                    esc_html__('%s must be a valid URL.', 'additional-checkout-fields-for-woo'),
                                    '<strong>' . esc_html($field['label']) . '</strong>'
                                ),
                                'error'
                            );
                            $valid = false;
                        }
                        break;

                    case 'number':
                        if (!is_numeric($field_value)) {
                            wc_add_notice(
                                sprintf(
                                    /* translators: %s: field label */
                                    esc_html__('%s must be a valid number.', 'additional-checkout-fields-for-woo'),
                                    '<strong>' . esc_html($field['label']) . '</strong>'
                                ),
                                'error'
                            );
                            $valid = false;
                        }
                        break;

                    case 'tel':
                        if (!WC_Validation::is_phone($field_value)) {
                            wc_add_notice(
                                sprintf(
                                    /* translators: %s: field label */
                                    esc_html__('%s must be a valid phone number.', 'additional-checkout-fields-for-woo'),
                                    '<strong>' . esc_html($field['label']) . '</strong>'
                                ),
                                'error'
                            );
                            $valid = false;
                        }
                        break;
                }
            }
        }

        return $valid;
    }

    private function get_field_value($field_id, $field_type) {
        // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verification is handled by WooCommerce checkout process
        if (!isset($_POST[$field_id])) {
            return '';
        }

        switch ($field_type) {
            case 'checkbox':
                // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verification is handled by WooCommerce checkout process
                return isset($_POST[$field_id]) ? map_deep(wp_unslash($_POST[$field_id]), 'sanitize_text_field') : array();
            
            case 'textarea':
                // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Nonce verification is handled by WooCommerce checkout process, input is sanitized below
                return trim(sanitize_textarea_field(wp_unslash($_POST[$field_id])));
            
            default:
                // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Nonce verification is handled by WooCommerce checkout process, input is sanitized below
                return trim(sanitize_text_field(wp_unslash($_POST[$field_id])));
        }
    }
}