<?php

declare(strict_types=1);

namespace Aivie\WooCommerce\Support;

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

class GdprHooks
{
    public static function register(): void
    {
        add_filter('wp_privacy_personal_data_exporters', [self::class, 'registerExporter']);
        add_filter('wp_privacy_personal_data_erasers', [self::class, 'registerEraser']);
    }

    public static function registerExporter(array $exporters): array
    {
        $exporters['aivie-for-woocommerce'] = [
            'exporter_friendly_name' => __('Aivie for WooCommerce', 'aivie-for-woocommerce'),
            'callback'               => [self::class, 'exportPersonalData'],
        ];
        return $exporters;
    }

    public static function registerEraser(array $erasers): array
    {
        $erasers['aivie-for-woocommerce'] = [
            'eraser_friendly_name' => __('Aivie for WooCommerce', 'aivie-for-woocommerce'),
            'callback'             => [self::class, 'erasePersonalData'],
        ];
        return $erasers;
    }

    public static function exportPersonalData(string $email, int $page = 1): array
    {
        $exportData = [];
        $orders     = wc_get_orders([
            'billing_email' => $email,
            'limit'         => 20,
            'page'          => $page,
            'return'        => 'objects',
        ]);

        foreach ($orders as $order) {
            if (! $order instanceof \WC_Order) {
                continue;
            }

            $item = [
                'group_id'    => 'aivie-for-woocommerce',
                'group_label' => __('Aivie for WooCommerce Sync Data', 'aivie-for-woocommerce'),
                'item_id'     => 'aivie-wc-order-' . $order->get_id(),
                'data'        => [],
            ];

            $metaKeys = [
                '_aivie_wc_last_sync_status',
                '_aivie_wc_last_sync_type',
                '_aivie_wc_last_sync_at',
                '_aivie_wc_last_sync_event_id',
                '_aivie_wc_tracking_contact_id',
                '_aivie_wc_last_payment_failure_reason',
            ];

            foreach ($metaKeys as $key) {
                $value = $order->get_meta($key);
                if ('' !== (string) $value) {
                    $item['data'][] = [
                        'name'  => $key,
                        'value' => $value,
                    ];
                }
            }

            if (! empty($item['data'])) {
                $exportData[] = $item;
            }
        }

        return [
            'data' => $exportData,
            'done' => count($orders) < 20,
        ];
    }

    public static function erasePersonalData(string $email, int $page = 1): array
    {
        $itemsRemoved = false;
        $orders       = wc_get_orders([
            'billing_email' => $email,
            'limit'         => 20,
            'page'          => $page,
            'return'        => 'objects',
        ]);

        foreach ($orders as $order) {
            if (! $order instanceof \WC_Order) {
                continue;
            }

            // Remove tracking contact ID only — keep sync status meta for audit trail.
            $trackingId = $order->get_meta('_aivie_wc_tracking_contact_id');
            if ('' !== (string) $trackingId) {
                $order->delete_meta_data('_aivie_wc_tracking_contact_id');
                $order->save_meta_data();
                $itemsRemoved = true;
            }
        }

        // Also remove from user meta if we can identify the user.
        $user = get_user_by('email', $email);
        if ($user instanceof \WP_User) {
            delete_user_meta($user->ID, '_aivie_wc_tracking_contact_id');
            $itemsRemoved = true;
        }

        return [
            'items_removed'  => $itemsRemoved,
            'items_retained' => false,
            'messages'       => [],
            'done'           => count($orders) < 20,
        ];
    }
}