<?php
// Manages custom columns in the WooCommerce orders list (HPOS and legacy).

defined('ABSPATH') || exit;

class Custom_Columns_Manager {
    /**
     * Per-request cache of resolved WC_Order objects keyed by order ID.
     * Used only on the legacy CPT path where WP passes us the order ID;
     * under HPOS WC already hands us the WC_Order instance directly.
     * @var array<int,WC_Order|false>
     */
    private $order_cache = array();

    public function __construct() {
        add_filter('manage_woocommerce_page_wc-orders_columns', array($this, 'add_custom_shop_order_column'));
        add_action('manage_woocommerce_page_wc-orders_custom_column', array($this, 'add_custom_shop_order_column_content'), 10, 2);
    }

    public function add_custom_shop_order_column($columns) {
        $new_columns = array();
        foreach ($columns as $column_name => $column_info) {
            $new_columns[$column_name] = $column_info;
            if ($column_name === 'order_total') {
                $new_columns['to_print_date']         = __('To Print Date', 'studiou-wc-ord-print-statuses');
                $new_columns['in_print_date']         = __('In Print Date', 'studiou-wc-ord-print-statuses');
                $new_columns['external_order_number'] = __('External Order Number', 'studiou-wc-ord-print-statuses');
            }
        }
        return $new_columns;
    }

    /**
     * Render cell content. Under HPOS WC passes the WC_Order object as the
     * second argument; under legacy CPT it passes the post ID. Use the
     * object directly when WC hands us one (skipping the wc_get_order
     * lookup entirely), and memoise by ID for the legacy path so we don't
     * re-resolve the same order for each of the three custom columns.
     */
    public function add_custom_shop_order_column_content($column, $order_or_id) {
        if ($order_or_id instanceof WC_Abstract_Order) {
            $order = $order_or_id;
        } else {
            $id = (int) $order_or_id;
            if (!array_key_exists($id, $this->order_cache)) {
                $this->order_cache[$id] = wc_get_order($id);
            }
            $order = $this->order_cache[$id];
        }
        if (!$order) {
            echo '—';
            return;
        }
        switch ($column) {
            case 'to_print_date':
                echo $this->format_meta_date($order->get_meta('to_print_date'));
                break;
            case 'in_print_date':
                echo $this->format_meta_date($order->get_meta('in_print_date'));
                break;
            case 'external_order_number':
                $value = $order->get_meta('external_ref_ord_no');
                echo $value !== '' ? esc_html($value) : '—';
                break;
        }
    }

    /**
     * Format a MySQL datetime meta value for display.
     *
     * The stored value (written by current_time('mysql')) is already in WP
     * local time. Previously this method used strtotime()/date_i18n() which
     * applied the timezone offset twice on hosts where the PHP server
     * timezone differs from the WP site timezone (e.g. UTC server +
     * Europe/Prague site → display drifted by 1–2 hours).
     *
     * We now parse the string as WP-local time explicitly, then format via
     * wp_date() which respects WP timezone. This keeps locale-aware
     * formatting while eliminating the offset drift.
     */
    private function format_meta_date($value) {
        if (empty($value)) {
            return '—';
        }
        $value = trim((string) $value);
        // Accept both 'YYYY-MM-DD HH:MM:SS' and 'YYYY-MM-DDTHH:MM[:SS]'.
        $normalised = str_replace('T', ' ', $value);
        if (!preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}(:\d{2})?$/', $normalised)) {
            return '—';
        }
        if (strlen($normalised) === 16) { // missing seconds
            $normalised .= ':00';
        }
        try {
            $dt = new DateTimeImmutable($normalised, wp_timezone());
        } catch (Exception $e) {
            return '—';
        }
        $fmt = get_option('date_format') . ' ' . get_option('time_format');
        return esc_html(wp_date($fmt, $dt->getTimestamp()));
    }
}