/*
 * Copyright (C) 2017-present ScyllaDB
 */

/*
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

#pragma once

#include <chrono>
#include <string_view>
#include <functional>
#include <iostream>
#include <optional>
#include <utility>

#include <seastar/core/future.hh>
#include <seastar/core/shared_ptr.hh>
#include <seastar/core/sstring.hh>

#include "auth/authenticated_user.hh"
#include "auth/permission.hh"
#include "auth/resource.hh"
#include "auth/role_or_anonymous.hh"
#include "log.hh"
#include "utils/hash.hh"
#include "utils/loading_cache.hh"

namespace std {

inline std::ostream& operator<<(std::ostream& os, const pair<auth::role_or_anonymous, auth::resource>& p) {
    os << "{role: " << p.first << ", resource: " << p.second << "}";
    return os;
}

}

namespace db {
class config;
}

namespace auth {

class service;

struct permissions_cache_config final {
    std::size_t max_entries;
    std::chrono::milliseconds validity_period;
    std::chrono::milliseconds update_period;
};

class permissions_cache final {
    using cache_type = utils::loading_cache<
            std::pair<role_or_anonymous, resource>,
            permission_set,
            1,
            utils::loading_cache_reload_enabled::yes,
            utils::simple_entry_size<permission_set>,
            utils::tuple_hash>;

    using key_type = typename cache_type::key_type;

    cache_type _cache;

public:
    explicit permissions_cache(const permissions_cache_config&, service&, logging::logger&);

    future <> stop() {
        return _cache.stop();
    }

    future<permission_set> get(const role_or_anonymous&, const resource&);
};

}