/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *   Copyright 2020-2021 Couchbase, 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 "client_opcode.hxx"
#include "cmd_info.hxx"
#include "core/document_id.hxx"
#include "core/io/mcbp_message.hxx"
#include "status.hxx"

#include <couchbase/durability_level.hxx>
#include <couchbase/mutation_token.hxx>

namespace couchbase::core::protocol
{

class increment_response_body
{
  public:
    static const inline client_opcode opcode = client_opcode::increment;

  private:
    mutation_token token_{};
    std::uint64_t content_{ 0 };

  public:
    [[nodiscard]] std::uint64_t content() const
    {
        return content_;
    }

    [[nodiscard]] const mutation_token& token() const
    {
        return token_;
    }

    bool parse(key_value_status_code status,
               const header_buffer& header,
               std::uint8_t framing_extras_size,
               std::uint16_t key_size,
               std::uint8_t extras_size,
               const std::vector<std::byte>& body,
               const cmd_info& info);
};

class increment_request_body
{
  public:
    using response_body_type = increment_response_body;
    static const inline client_opcode opcode = client_opcode::increment;

  private:
    std::vector<std::byte> key_;
    std::vector<std::byte> framing_extras_{};
    std::uint64_t delta_{ 1 };
    std::uint64_t initial_value_{ 0 };
    std::uint32_t expiry_{ 0 };
    std::vector<std::byte> extras_{};

  public:
    void id(const document_id& id);

    void delta(std::uint64_t value)
    {
        delta_ = value;
    }

    void initial_value(std::uint64_t value)
    {
        initial_value_ = value;
    }

    void expiry(std::uint32_t value)
    {
        expiry_ = value;
    }

    void durability(durability_level level, std::optional<std::uint16_t> timeout);

    [[nodiscard]] const auto& key() const
    {
        return key_;
    }

    [[nodiscard]] const auto& framing_extras() const
    {
        return framing_extras_;
    }

    [[nodiscard]] const auto& extras()
    {
        if (extras_.empty()) {
            fill_extras();
        }
        return extras_;
    }

    [[nodiscard]] const auto& value() const
    {
        return empty_buffer;
    }

    [[nodiscard]] std::size_t size()
    {
        if (extras_.empty()) {
            fill_extras();
        }
        return extras_.size() + framing_extras_.size() + key_.size();
    }

  private:
    void fill_extras();
};

} // namespace couchbase::core::protocol