<?php
/**
 * Export Handler Class - Handles CSV export functionality
 *
 * @package StudiouWCCustomReports
 */

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

class StudiouWC_Export_Handler {
    
    private $db_manager;
    private $settings_manager;
    
    public function __construct($db_manager, $settings_manager) {
        $this->db_manager = $db_manager;
        $this->settings_manager = $settings_manager;
    }
    
    public function export_csv() {
        if (!current_user_can('manage_woocommerce')) {
            wp_die(__('You do not have sufficient permissions to access this page.', StudiouWC_Main::get_text_domain()));
        }
        
        $view = isset($_POST['view']) ? sanitize_text_field($_POST['view']) : 'product_categories_summary';
        $date_from = isset($_POST['date_from']) ? sanitize_text_field($_POST['date_from']) : '';
        $date_to = isset($_POST['date_to']) ? sanitize_text_field($_POST['date_to']) : '';
        $statuses = isset($_POST['statuses']) ? array_map('sanitize_text_field', $_POST['statuses']) : array();

        if ($view === 'order_customers_list') {
            $report_data = $this->db_manager->get_order_customers_list($date_from, $date_to, $statuses, 999999, 1, 'customer_name', 'ASC');
            $this->generate_customers_csv_output($report_data);
        } else {
            // Get all data without pagination for export
            $report_data = $this->db_manager->get_product_categories_summary($date_from, $date_to, $statuses, 999999, 1, 'category', 'ASC');

            $settings = $this->settings_manager->get_settings();
            $default_property = $settings['default_property'] ?? '';
            $property_values = array();

            if (!empty($default_property)) {
                $property_values = $this->db_manager->get_property_values($default_property);
            }

            $this->generate_csv_output($report_data, $property_values);
        }
    }
    
    private function generate_csv_output($report_data, $property_values) {
        // Set headers for CSV download
        header('Content-Type: text/csv; charset=utf-8');
        $filename = sprintf(
            /* translators: %s: current date */
            __('custom-reports-%s.csv', StudiouWC_Main::get_text_domain()),
            date('Y-m-d')
        );
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Pragma: no-cache');
        header('Expires: 0');
        
        $output = fopen('php://output', 'w');
        
        // Add UTF-8 BOM for Excel compatibility
        fprintf($output, chr(0xEF).chr(0xBB).chr(0xBF));
        
        // CSV headers
        $headers = $this->get_csv_headers($property_values);
        fputcsv($output, $headers);
        
        // CSV data
        foreach ($report_data as $row) {
            $csv_row = $this->format_csv_row($row, $property_values);
            fputcsv($output, $csv_row);
        }
        
        fclose($output);
        exit;
    }
    
    private function generate_customers_csv_output($report_data) {
        header('Content-Type: text/csv; charset=utf-8');
        $filename = sprintf(
            /* translators: %s: current date */
            __('order-customers-%s.csv', StudiouWC_Main::get_text_domain()),
            date('Y-m-d')
        );
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Pragma: no-cache');
        header('Expires: 0');

        $output = fopen('php://output', 'w');

        // Add UTF-8 BOM for Excel compatibility
        fprintf($output, chr(0xEF).chr(0xBB).chr(0xBF));

        // CSV headers
        fputcsv($output, array(
            __('Customer Name', StudiouWC_Main::get_text_domain()),
            __('Email', StudiouWC_Main::get_text_domain()),
            __('Phone', StudiouWC_Main::get_text_domain()),
            __('Orders Count', StudiouWC_Main::get_text_domain()),
            __('Total Orders Price', StudiouWC_Main::get_text_domain()),
        ));

        // CSV data
        foreach ($report_data as $row) {
            fputcsv($output, array(
                $row['customer_name'],
                $row['customer_email'],
                $row['customer_phone'],
                $row['orders_count'],
                strip_tags(wc_price($row['total_price'])),
            ));
        }

        fclose($output);
        exit;
    }

    private function get_csv_headers($property_values) {
        $headers = array(
            __('Product Category', StudiouWC_Main::get_text_domain()),
            __('Orders Count', StudiouWC_Main::get_text_domain())
        );
        
        foreach ($property_values as $slug => $name) {
            /* translators: %s: property name */
            $headers[] = sprintf(__('%s Count', StudiouWC_Main::get_text_domain()), $name);
        }
        
        $headers[] = __('Total Price', StudiouWC_Main::get_text_domain());
        
        return $headers;
    }
    
    private function format_csv_row($row, $property_values) {
        $csv_row = array(
            $row['category'],
            $row['orders_count']
        );
        
        foreach ($property_values as $slug => $name) {
            $csv_row[] = $row['property_counts'][$slug] ?? 0;
        }
        
        // Format price without HTML for CSV
        $csv_row[] = strip_tags(wc_price($row['total_price']));
        
        return $csv_row;
    }
}