/**
     * Display affiliate column content
     *
     * @param string $output Column output
     * @param string $column_name Column name
     * @param int $user_id User ID
     * @return string Modified output
     */
    public function affiliate_user_column_content($output, $column_name, $user_id) {
        if ('simfly_affiliate' !== $column_name) {
            return $output;
        }
        
        if (simfly_aff_is_user_affiliate($user_id)) {
            $commission = SimFly_Aff_Commission::get_instance();
            
            // Get tier
            $manual_tier = get_user_meta($user_id, 'simfly_aff_manual_tier', true);
            $tier = !empty($manual_tier) ? $manual_tier : $commission->get_affiliate_tier($user_id);
            
            // Get stats
            $stats = $this->get_affiliate_stats_summary($user_id);
            
            $output = '<span class="simfly-aff-status simfly-aff-status-active">' . esc_html__('Yes', 'simfly-affiliates') . '</span>';
            $output .= '<br>';
            $output .= '<small>' . esc_html__('Tier:', 'simfly-affiliates') . ' ' . esc_html(simfly_aff_get_tier_label($tier)) . '</small>';
            
            if ($stats['total_commissions'] > 0) {
                $output .= '<br>';
                $output .= '<small>' . esc_html__('Commissions:', 'simfly-affiliates') . ' ' . wc_price($stats['total_commissions']) . '</small>';
            }
        } else {
            $output = '<span class="simfly-aff-status simfly-aff-status-inactive">' . esc_html__('No', 'simfly-affiliates') . '</span>';
            
            // Add link to make user an affiliate
            $output .= '<br>';
            $output .= '<a href="#" class="simfly-aff-make-affiliate" data-user-id="' . esc_attr($user_id) . '">' . esc_html__('Make Affiliate', 'simfly-affiliates') . '</a>';
        }
        
        return $output;
    }

    /**
     * Get affiliate stats summary
     *
     * @param int $affiliate_id Affiliate ID
     * @return array Stats summary
     */
    private function get_affiliate_stats_summary($affiliate_id) {
        global $wpdb;
        
        $stats = array(
            'total_referrals' => 0,
            'total_commissions' => 0,
            'unpaid_commissions' => 0
        );
        
        // Get stats
        $result = $wpdb->get_row(
            $wpdb->prepare(
                "SELECT 
                    COUNT(DISTINCT post_id) AS total_referrals,
                    SUM(amount) AS total_commissions,
                    SUM(CASE WHEN status = 'unpaid' AND order_status = 'wc-completed' THEN amount ELSE 0 END) AS unpaid_commissions
                FROM {$wpdb->prefix}afwc_referrals 
                WHERE affiliate_id = %d
                AND status != 'rejected'",
                $affiliate_id
            ),
            ARRAY_A
        );
        
        if ($result) {
            $stats['total_referrals'] = (int) $result['total_referrals'];
            $stats['total_commissions'] = (float) $result['total_commissions'];
            $stats['unpaid_commissions'] = (float) $result['unpaid_commissions'];
        }
        
        return $stats;
    }

    /**
     * Add meta boxes to WooCommerce order edit page
     */
    public function add_order_meta_boxes() {
        add_meta_box(
            'simfly_aff_order_meta_box',
            __('Affiliate Information', 'simfly-affiliates'),
            array($this, 'render_order_meta_box'),
            'shop_order',
            'side',
            'high'
        );
    }

    /**
     * Render order meta box
     *
     * @param WP_Post $post Post object
     */
    public function render_order_meta_box($post) {
        global $wpdb;
        
        // Get order referrals
        $referrals = $wpdb->get_results(
            $wpdb->prepare(
                "SELECT r.*, u.display_name
                FROM {$wpdb->prefix}afwc_referrals r
                LEFT JOIN {$wpdb->users} u ON r.affiliate_id = u.ID
                WHERE r.post_id = %d",
                $post->ID
            ),
            ARRAY_A
        );
        
        if (empty($referrals)) {
            echo '<p>' . esc_html__('No affiliate referral for this order.', 'simfly-affiliates') . '</p>';
            return;
        }
        
        foreach ($referrals as $referral) {
            $status_class = 'simfly-aff-status-' . $referral['status'];
            $affiliate_name = !empty($referral['display_name']) ? $referral['display_name'] : __('Affiliate #', 'simfly-affiliates') . $referral['affiliate_id'];
            
            echo '<div class="simfly-aff-order-referral">';
            echo '<p><strong>' . esc_html__('Affiliate:', 'simfly-affiliates') . '</strong> <a href="' . esc_url(admin_url('user-edit.php?user_id=' . $referral['affiliate_id'])) . '">' . esc_html($affiliate_name) . '</a></p>';
            echo '<p><strong>' . esc_html__('Commission:', 'simfly-affiliates') . '</strong> ' . wc_price($referral['amount']) . '</p>';
            echo '<p><strong>' . esc_html__('Status:', 'simfly-affiliates') . '</strong> <span class="simfly-aff-status ' . esc_attr($status_class) . '">' . esc_html(ucfirst($referral['status'])) . '</span></p>';
            echo '<p><strong>' . esc_html__('Type:', 'simfly-affiliates') . '</strong> ' . esc_html(ucfirst($referral['type'])) . '</p>';
            echo '<p><strong>' . esc_html__('Date:', 'simfly-affiliates') . '</strong> ' . esc_html(date_i18n(get_option('date_format') . ' ' . get_option('time_format'), strtotime($referral['datetime']))) . '</p>';
            
            // Add actions
            echo '<div class="simfly-aff-referral-actions">';
            if ('unpaid' === $referral['status']) {
                echo '<a href="' . esc_url(admin_url('admin.php?page=simfly-affiliate-payouts&tab=payouts&affiliate=' . $referral['affiliate_id'])) . '" class="button">' . esc_html__('Process Payment', 'simfly-affiliates') . '</a>';
            }
            echo '</div>';
            
            echo '</div>';
        }
    }

    /**
     * Save order meta box data
     *
     * @param int $post_id Post ID
     * @param WP_Post $post Post object
     */
    public function save_order_meta_box($post_id, $post) {
        // Skip autosave
        if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
            return;
        }
        
        // Check post type
        if ('shop_order' !== $post->post_type) {
            return;
        }
        
        // Check permissions
        if (!current_user_can('edit_post', $post_id)) {
            return;
        }
        
        // No data to save in the meta box currently
    }

    /**
     * Register settings
     */
    public function register_settings() {
        // General settings
        register_setting('simfly_aff_settings', 'simfly_aff_referral_param');
        register_setting('simfly_aff_settings', 'simfly_aff_cookie_duration');
        register_setting('simfly_aff_settings', 'simfly_aff_default_commission_status');
        register_setting('simfly_aff_settings', 'simfly_aff_manager_email');
        
        // Link & coupon settings
        register_setting('simfly_aff_settings', 'simfly_aff_use_pretty_links');
        register_setting('simfly_aff_settings', 'simfly_aff_allow_custom_identifiers');
        register_setting('simfly_aff_settings', 'simfly_aff_use_referral_coupons');
        register_setting('simfly_aff_settings', 'simfly_aff_allow_paypal_email');
        
        // Commission tiers
        register_setting('simfly_aff_settings', 'simfly_aff_commission_tiers');
    }

    /**
     * AJAX handler for saving settings
     */
    public function ajax_save_settings() {
        // Check nonce
        check_ajax_referer('simfly_aff_save_settings', 'security');
        
        // Check permissions
        if (!current_user_can('manage_options')) {
            wp_send_json_error(array('message' => __('You do not have permission to do this.', 'simfly-affiliates')));
            return;
        }
        
        // Parse form data
        parse_str($_POST['formdata'], $form_data);
        
        // Update general settings
        update_option('simfly_aff_referral_param', sanitize_text_field($form_data['simfly_aff_referral_param']));
        update_option('simfly_aff_cookie_duration', absint($form_data['simfly_aff_cookie_duration']));
        update_option('simfly_aff_default_commission_status', sanitize_text_field($form_data['simfly_aff_default_commission_status']));
        update_option('simfly_aff_manager_email', sanitize_email($form_data['simfly_aff_manager_email']));
        
        // Update link & coupon settings
        update_option('simfly_aff_use_pretty_links', isset($form_data['simfly_aff_use_pretty_links']) ? 'yes' : 'no');
        update_option('simfly_aff_allow_custom_identifiers', isset($form_data['simfly_aff_allow_custom_identifiers']) ? 'yes' : 'no');
        update_option('simfly_aff_use_referral_coupons', isset($form_data['simfly_aff_use_referral_coupons']) ? 'yes' : 'no');
        update_option('simfly_aff_allow_paypal_email', isset($form_data['simfly_aff_allow_paypal_email']) ? 'yes' : 'no');
        
        // Update commission tiers
        if (isset($form_data['simfly_aff_tiers']) && is_array($form_data['simfly_aff_tiers'])) {
            $tiers = array();
            
            foreach ($form_data['simfly_aff_tiers'] as $tier_key => $tier_data) {
                $tiers[$tier_key] = array(
                    'min_sales' => absint($tier_data['min_sales']),
                    'max_sales' => absint($tier_data['max_sales']),
                    'commission' => absint($tier_data['commission']),
                    'discount' => absint($tier_data['discount'])
                );
            }
            
            update_option('simfly_aff_commission_tiers', $tiers);
        }
        
        // Flush rewrite rules if pretty links setting changed
        if (isset($form_data['simfly_aff_use_pretty_links']) !== (get_option('simfly_aff_use_pretty_links', 'yes') === 'yes')) {
            flush_rewrite_rules();
        }
        
        wp_send_json_success(array('message' => __('Settings saved successfully!', 'simfly-affiliates')));
    }

    /**
     * AJAX handler for creating an affiliate
     */
    public function ajax_make_affiliate() {
        // Check nonce
        check_ajax_referer('simfly_aff_admin_nonce', 'security');
        
        // Check permissions
        if (!current_user_can('manage_woocommerce')) {
            wp_send_json_error(array('message' => __('You do not have permission to do this.', 'simfly-affiliates')));
            return;
        }
        
        // Get user ID
        $user_id = isset($_POST['user_id']) ? absint($_POST['user_id']) : 0;
        
        if (!$user_id) {
            wp_send_json_error(array('message' => __('Invalid user ID.', 'simfly-affiliates')));
            return;
        }
        
        // Check if user already is an affiliate
        if (simfly_aff_is_user_affiliate($user_id)) {
            wp_send_json_error(array('message' => __('User is already an affiliate.', 'simfly-affiliates')));
            return;
        }
        
        // Register user as affiliate
        $registered = simfly_aff_register_affiliate($user_id);
        
        if ($registered) {
            wp_send_json_success(array('message' => __('User successfully registered as an affiliate.', 'simfly-affiliates')));
        } else {
            wp_send_json_error(array('message' => __('Failed to register user as an affiliate.', 'simfly-affiliates')));
        }
    }
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