// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <Storages/Page/V3/PageEntriesEdit.h>

#include <string_view>

namespace DB::PS::V3
{
enum WALSerializeVersion : UInt32
{
    Plain = 1,
    LZ4 = 2,
};

struct Comparator
{
    using is_transparent = void;

    bool operator()(const std::shared_ptr<const String> & p1, const std::shared_ptr<const String> & p2) const
    {
        return *p1 < *p2;
    }

    bool operator()(const std::shared_ptr<const String> & p, const String & value) const { return *p < value; }

    bool operator()(const String & value, const std::shared_ptr<const String> & p) const { return value < *p; }
};

using DataFileIdSet = std::set<std::shared_ptr<const String>, Comparator>;

template <typename PageEntriesEdit>
struct Serializer
{
    static String serializeTo(const PageEntriesEdit & edit);
    static String serializeInCompressedFormTo(const PageEntriesEdit & edit);
    static PageEntriesEdit deserializeFrom(std::string_view record, DataFileIdSet * data_file_id_set);
};

namespace u128
{
using Serializer = Serializer<PageEntriesEdit>;
} // namespace u128
namespace universal
{
using Serializer = Serializer<PageEntriesEdit>;
} // namespace universal
} // namespace DB::PS::V3