// 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 <Core/QualifiedTableName.h>
#include <Core/Types.h>

#include <unordered_map>
#include <unordered_set>

namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int TOO_LARGE_ARRAY_SIZE;
} // namespace ErrorCodes

class ReadBuffer;
class WriteBuffer;


/// The following are request-response messages for TablesStatus request of the client-server protocol.
/// Client can ask for about a set of tables and the server will respond with the following information for each table:
/// - Is the table Replicated?
/// - If yes, replication delay for that table.
///
/// For nonexistent tables there will be no TableStatus entry in the response.

struct TableStatus
{
    bool is_replicated = false;
    UInt32 absolute_delay = 0;

    void write(WriteBuffer & out) const;
    void read(ReadBuffer & in);
};

struct TablesStatusRequest
{
    std::unordered_set<QualifiedTableName> tables;

    void write(WriteBuffer & out) const;
    void read(ReadBuffer & in);
};

struct TablesStatusResponse
{
    std::unordered_map<QualifiedTableName, TableStatus> table_states_by_id;

    void write(WriteBuffer & out) const;
    void read(ReadBuffer & in);
};

} // namespace DB