<?php

declare(strict_types=1);

namespace paygw_moneta\privacy;

use context;
use context_system;
use core_payment\privacy\paygw_provider;
use core_privacy\local\metadata\collection;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\approved_userlist;
use core_privacy\local\request\contextlist;
use core_privacy\local\request\core_userlist_provider;
use core_privacy\local\request\transform;
use core_privacy\local\request\userlist;
use core_privacy\local\request\writer;
use paygw_moneta\local\order\Order;
use paygw_moneta\local\order\TransactionRepository;

/**
 * Privacy API: заказы `paygw_moneta_transactions` содержат id покупателя,
 * сумму, статус и снимок чека с его e-mail/телефоном.
 *
 * Оплаченные заказы ядро выгружает и удаляет вместе с платежом
 * ({@see paygw_provider}); неоплаченные не привязаны к платежу, поэтому
 * плагин обслуживает их сам в системном контексте.
 *
 * @package paygw_moneta
 * @copyright 2026 Moneta Labs {@link https://moneta.ru/}
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class provider implements
    \core_privacy\local\metadata\provider,
    \core_privacy\local\request\plugin\provider,
    core_userlist_provider,
    paygw_provider
{
    public static function get_metadata(collection $collection): collection
    {
        $collection->add_database_table(TransactionRepository::TABLE, [
            'userid' => 'privacy:metadata:transactions:userid',
            'amount' => 'privacy:metadata:transactions:amount',
            'status' => 'privacy:metadata:transactions:status',
            'merchantorderid' => 'privacy:metadata:transactions:merchantorderid',
            'providertransactionid' => 'privacy:metadata:transactions:providertransactionid',
            'snapshot' => 'privacy:metadata:transactions:snapshot',
            'timecreated' => 'privacy:metadata:transactions:timecreated',
        ], 'privacy:metadata:transactions');
        $collection->add_external_location_link('moneta', [
            'userid' => 'privacy:metadata:moneta:userid',
            'fullname' => 'privacy:metadata:moneta:fullname',
            'email' => 'privacy:metadata:moneta:email',
            'phone' => 'privacy:metadata:moneta:phone',
            'amount' => 'privacy:metadata:moneta:amount',
        ], 'privacy:metadata:moneta');

        return $collection;
    }

    public static function get_contexts_for_userid(int $userid): contextlist
    {
        global $DB;

        $contextlist = new contextlist();
        if ($DB->record_exists(TransactionRepository::TABLE, ['userid' => $userid])) {
            $contextlist->add_system_context();
        }

        return $contextlist;
    }

    public static function get_users_in_context(userlist $userlist): void
    {
        if (!$userlist->get_context() instanceof context_system) {
            return;
        }
        $userlist->add_from_sql('userid', 'SELECT userid FROM {' . TransactionRepository::TABLE . '}', []);
    }

    public static function export_user_data(approved_contextlist $contextlist): void
    {
        global $DB;

        foreach ($contextlist->get_contexts() as $context) {
            if (!$context instanceof context_system) {
                continue;
            }

            $records = $DB->get_records(
                TransactionRepository::TABLE,
                ['userid' => $contextlist->get_user()->id],
                'timecreated',
            );

            $orders = [];
            foreach ($records as $record) {
                $orders[] = self::describe(Order::fromRecord($record));
            }
            if ($orders !== []) {
                writer::with_context($context)->export_data(
                    [get_string('gatewayname', 'paygw_moneta')],
                    (object) ['orders' => $orders],
                );
            }
        }
    }

    public static function delete_data_for_all_users_in_context(context $context): void
    {
        global $DB;

        if ($context instanceof context_system) {
            $DB->delete_records(TransactionRepository::TABLE);
        }
    }

    public static function delete_data_for_user(approved_contextlist $contextlist): void
    {
        global $DB;

        foreach ($contextlist->get_contexts() as $context) {
            if ($context instanceof context_system) {
                $DB->delete_records(TransactionRepository::TABLE, ['userid' => $contextlist->get_user()->id]);
            }
        }
    }

    public static function delete_data_for_users(approved_userlist $userlist): void
    {
        global $DB;

        if (!$userlist->get_context() instanceof context_system || $userlist->get_userids() === []) {
            return;
        }
        [$sql, $params] = $DB->get_in_or_equal($userlist->get_userids(), SQL_PARAMS_NAMED);
        $DB->delete_records_select(TransactionRepository::TABLE, "userid {$sql}", $params);
    }

    public static function export_payment_data(context $context, array $subcontext, \stdClass $payment): void
    {
        global $DB;

        $record = $DB->get_record(TransactionRepository::TABLE, ['paymentid' => $payment->id]);
        if ($record === false) {
            return;
        }

        $subcontext[] = get_string('gatewayname', 'paygw_moneta');
        writer::with_context($context)->export_data($subcontext, self::describe(Order::fromRecord($record)));
    }

    public static function delete_data_for_payment_sql(string $paymentsql, array $paymentparams): void
    {
        global $DB;

        $DB->delete_records_select(TransactionRepository::TABLE, "paymentid IN ({$paymentsql})", $paymentparams);
    }

    /**
     * Заказ в выгрузке: без внутренних идентификаторов и без данных кассы сверх контактов.
     */
    private static function describe(Order $order): \stdClass
    {
        return (object) [
            'merchantorderid' => $order->merchantOrderId,
            'providertransactionid' => $order->providerTransactionId,
            'amount' => $order->amount->toDecimal() . ' ' . $order->currency,
            'status' => $order->status->value,
            'description' => $order->snapshot->description,
            'client' => $order->snapshot->receipt->client->toArray(),
            'timecreated' => transform::datetime($order->timeCreated),
            'timecompleted' => $order->timeCompleted === null ? null : transform::datetime($order->timeCompleted),
        ];
    }
}