<?php
/**
 * Utility Helper Class - Common utility functions
 *
 * @package StudiouWCCustomReports
 */

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

class StudiouWC_Utils {
    
    /**
     * Recursively sanitize request data
     */
    public static function sanitize_request_data($data) {
        if (is_array($data)) {
            return array_map(array(self::class, 'sanitize_request_data'), $data);
        }
        
        return sanitize_text_field($data);
    }
    
    /**
     * Format price using WooCommerce formatting
     */
    public static function format_price($price) {
        return wc_price($price);
    }
    
    /**
     * Get WooCommerce order statuses
     */
    public static function get_order_statuses() {
        return wc_get_order_statuses();
    }
    
    /**
     * Validate date format
     */
    public static function is_valid_date_format($date, $format = 'Y-m-d') {
        $d = DateTime::createFromFormat($format, $date);
        return $d && $d->format($format) === $date;
    }
    
    /**
     * Generate pagination links
     */
    public static function get_pagination_links($current_page, $total_pages, $base_url) {
        $links = array();
        
        if ($current_page > 1) {
            $links['prev'] = add_query_arg('paged', $current_page - 1, $base_url);
        }
        
        if ($current_page < $total_pages) {
            $links['next'] = add_query_arg('paged', $current_page + 1, $base_url);
        }
        
        return $links;
    }
    
    /**
     * Get file extension from filename
     */
    public static function get_file_extension($filename) {
        return pathinfo($filename, PATHINFO_EXTENSION);
    }
    
    /**
     * Generate secure filename for exports
     */
    public static function generate_export_filename($prefix = 'custom-reports', $extension = 'csv') {
        $timestamp = date('Y-m-d-H-i-s');
        return sanitize_file_name($prefix . '-' . $timestamp . '.' . $extension);
    }
    
    /**
     * Convert array to CSV row
     */
    public static function array_to_csv_row($data, $delimiter = ',') {
        $output = fopen('php://temp', 'r+');
        fputcsv($output, $data, $delimiter);
        rewind($output);
        $csv_row = stream_get_contents($output);
        fclose($output);
        
        return rtrim($csv_row, "\n");
    }
    
    /**
     * Validate and sanitize URL parameters
     */
    public static function sanitize_url_params($params) {
        $sanitized = array();
        
        foreach ($params as $key => $value) {
            switch ($key) {
                case 'date_from':
                case 'date_to':
                    if (self::is_valid_date_format($value)) {
                        $sanitized[$key] = $value;
                    }
                    break;
                    
                case 'per_page':
                case 'paged':
                    $sanitized[$key] = max(1, intval($value));
                    break;
                    
                case 'orderby':
                    $valid_orderby = array('category', 'orders_count', 'total_price');
                    if (in_array($value, $valid_orderby)) {
                        $sanitized[$key] = $value;
                    }
                    break;
                    
                case 'order':
                    if (in_array(strtoupper($value), array('ASC', 'DESC'))) {
                        $sanitized[$key] = strtoupper($value);
                    }
                    break;
                    
                case 'statuses':
                    if (is_array($value)) {
                        $sanitized[$key] = array_map('sanitize_text_field', $value);
                    }
                    break;
                    
                default:
                    $sanitized[$key] = sanitize_text_field($value);
                    break;
            }
        }
        
        return $sanitized;
    }
    
    /**
     * Format bytes to human readable format
     */
    public static function format_bytes($bytes, $precision = 2) {
        $units = array('B', 'KB', 'MB', 'GB', 'TB');
        
        for ($i = 0; $bytes > 1024 && $i < count($units) - 1; $i++) {
            $bytes /= 1024;
        }
        
        return round($bytes, $precision) . ' ' . $units[$i];
    }
    
    /**
     * Log debug information
     */
    public static function debug_log($message, $data = null) {
        if (defined('WP_DEBUG') && WP_DEBUG) {
            $log_message = '[Studiou WC Custom Reports] ' . $message;
            
            if ($data !== null) {
                $log_message .= ' | Data: ' . print_r($data, true);
            }
            
            error_log($log_message);
        }
    }
    
    /**
     * Check if current user can manage reports
     */
    public static function current_user_can_manage_reports() {
        return current_user_can('manage_woocommerce');
    }
    
    /**
     * Get plugin information
     */
    public static function get_plugin_info() {
        return array(
            'name' => 'QDR - Studiou WC Custom Reports',
            'version' => StudiouWC_Main::get_version(),
            'text_domain' => StudiouWC_Main::get_text_domain(),
            'plugin_dir' => StudiouWC_Main::get_plugin_dir(),
            'plugin_url' => StudiouWC_Main::get_plugin_url()
        );
    }
}