/*
 *     Copyright 2021-Present 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 "core/transactions/attempt_state.hxx"
#include "doc_record.hxx"

#include <chrono>
#include <cstdint>
#include <optional>
#include <string>
#include <utility>
#include <vector>

namespace couchbase::core::transactions
{

struct atr_entry {
  public:
    atr_entry() = default;
    atr_entry(std::string atr_bucket,
              std::string atr_id,
              std::string attempt_id,
              attempt_state state,
              std::optional<std::uint64_t> timestamp_start_ms,
              std::optional<std::uint64_t> timestamp_commit_ms,
              std::optional<std::uint64_t> timestamp_complete_ms,
              std::optional<std::uint64_t> timestamp_rollback_ms,
              std::optional<std::uint64_t> timestamp_rolled_back_ms,
              std::optional<std::uint32_t> expires_after_ms,
              std::optional<std::vector<doc_record>> inserted_ids,
              std::optional<std::vector<doc_record>> replaced_ids,
              std::optional<std::vector<doc_record>> removed_ids,
              std::optional<tao::json::value> forward_compat,
              std::uint64_t cas,
              std::optional<std::string> durability_level)
      : atr_bucket_(std::move(atr_bucket))
      , atr_id_(std::move(atr_id))
      , attempt_id_(std::move(attempt_id))
      , state_(state)
      , timestamp_start_ms_(timestamp_start_ms)
      , timestamp_commit_ms_(timestamp_commit_ms)
      , timestamp_complete_ms_(timestamp_complete_ms)
      , timestamp_rollback_ms_(timestamp_rollback_ms)
      , timestamp_rolled_back_ms_(timestamp_rolled_back_ms)
      , expires_after_ms_(expires_after_ms)
      , inserted_ids_(std::move(inserted_ids))
      , replaced_ids_(std::move(replaced_ids))
      , removed_ids_(std::move(removed_ids))
      , forward_compat_(std::move(forward_compat))
      , cas_(cas)
      , durability_level_(std::move(durability_level))
    {
    }

    [[nodiscard]] bool has_expired(std::uint32_t safety_margin = 0) const
    {
        std::uint64_t cas_ms = cas_ / 1000000;
        if (timestamp_start_ms_ && cas_ms > *timestamp_start_ms_) {
            std::uint32_t expires_after_ms = *expires_after_ms_;
            return (cas_ms - *timestamp_start_ms_) > (expires_after_ms + safety_margin);
        }
        return false;
    }

    [[nodiscard]] std::uint32_t age_ms() const
    {
        return static_cast<std::uint32_t>((cas_ / 1000000) - timestamp_start_ms_.value_or(0));
    }

    [[nodiscard]] const std::string& atr_id() const
    {
        return atr_id_;
    }

    [[nodiscard]] const std::string& attempt_id() const
    {
        return attempt_id_;
    }

    [[nodiscard]] std::optional<std::uint64_t> timestamp_start_ms() const
    {
        return timestamp_start_ms_;
    }
    [[nodiscard]] std::optional<std::uint64_t> timestamp_commit_ms() const
    {
        return timestamp_commit_ms_;
    }
    [[nodiscard]] std::optional<std::uint64_t> timestamp_complete_ms() const
    {
        return timestamp_complete_ms_;
    }
    [[nodiscard]] std::optional<std::uint64_t> timestamp_rollback_ms() const
    {
        return timestamp_rollback_ms_;
    }
    [[nodiscard]] std::optional<std::uint64_t> timestamp_rolled_back_ms() const
    {
        return timestamp_rolled_back_ms_;
    }

    /**
     * Returns the CAS of the ATR document containing this entry
     */
    [[nodiscard]] std::uint64_t cas() const
    {
        return cas_;
    }

    [[nodiscard]] std::optional<std::vector<doc_record>> inserted_ids() const
    {
        return inserted_ids_;
    }

    [[nodiscard]] std::optional<std::vector<doc_record>> replaced_ids() const
    {
        return replaced_ids_;
    }

    [[nodiscard]] std::optional<std::vector<doc_record>> removed_ids() const
    {
        return removed_ids_;
    }

    [[nodiscard]] std::optional<tao::json::value> forward_compat() const
    {
        return forward_compat_;
    }

    [[nodiscard]] std::optional<std::uint32_t> expires_after_ms() const
    {
        return expires_after_ms_;
    }

    [[nodiscard]] attempt_state state() const
    {
        return state_;
    }

    [[nodiscard]] std::optional<std::string> durability_level() const
    {
        return durability_level_;
    }

  private:
    std::string atr_bucket_;
    std::string atr_id_;
    std::string attempt_id_;
    attempt_state state_ = attempt_state::NOT_STARTED;
    std::optional<std::uint64_t> timestamp_start_ms_;
    std::optional<std::uint64_t> timestamp_commit_ms_;
    std::optional<std::uint64_t> timestamp_complete_ms_;
    std::optional<std::uint64_t> timestamp_rollback_ms_;
    std::optional<std::uint64_t> timestamp_rolled_back_ms_;
    std::optional<std::uint32_t> expires_after_ms_;
    std::optional<std::vector<doc_record>> inserted_ids_;
    std::optional<std::vector<doc_record>> replaced_ids_;
    std::optional<std::vector<doc_record>> removed_ids_;
    std::optional<tao::json::value> forward_compat_;
    std::uint64_t cas_{};
    // ExtStoreDurability
    std::optional<std::string> durability_level_;
};
} // namespace couchbase::core::transactions
