/*
 *     Copyright 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 <stdexcept>
#include <string>

namespace couchbase
{
namespace transactions
{
    /**
     * The possible states for a transaction attempt.
     */
    enum class attempt_state {
        /**
         * The attempt finished very early.
         */
        NOT_STARTED = 0,

        /**
         * Any call to one of the mutation methods - <code>insert</code>, <code>replace</code>, <code>remove</code> - will update the
         * state to PENDING.
         */
        PENDING,

        /**
         * Set once the Active Transaction Record entry for this transaction has been updated to mark the transaction as
         * Aborted.
         */
        ABORTED,

        /**
         * Set once the Active Transaction Record entry for this transaction has been updated to mark the transaction as
         * Committed.
         */
        COMMITTED,

        /**
         * Set once the commit is fully completed.
         */
        COMPLETED,

        /**
         * Set once the commit is fully rolled back.
         */
        ROLLED_BACK,

        /**
         * A state this client doesn't recognise.
         */
        UNKNOWN
    };

    inline const char* attempt_state_name(attempt_state state)
    {
        switch (state) {
            case attempt_state::NOT_STARTED:
                return "NOT_STARTED";
            case attempt_state::PENDING:
                return "PENDING";
            case attempt_state::ABORTED:
                return "ABORTED";
            case attempt_state::COMMITTED:
                return "COMMITTED";
            case attempt_state::COMPLETED:
                return "COMPLETED";
            case attempt_state::ROLLED_BACK:
                return "ROLLED_BACK";
            case attempt_state::UNKNOWN:
                return "UNKNOWN";
            default:
                throw std::runtime_error("unknown attempt state");
        }
    }

    inline attempt_state attempt_state_value(const std::string& str)
    {
        if (str == "NOT_STARTED") {
            return attempt_state::NOT_STARTED;
        } else if (str == "PENDING") {
            return attempt_state::PENDING;
        } else if (str == "ABORTED") {
            return attempt_state::ABORTED;
        } else if (str == "COMMITTED") {
            return attempt_state::COMMITTED;
        } else if (str == "COMPLETED") {
            return attempt_state::COMPLETED;
        } else if (str == "ROLLED_BACK") {
            return attempt_state::ROLLED_BACK;
        } else {
            return attempt_state::UNKNOWN;
        }
    }
} // namespace transactions
} // namespace couchbase
