/*
 *     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 <stdexcept>
#include <string>

namespace couchbase::core::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;
    }
    if (str == "PENDING") {
        return attempt_state::PENDING;
    }
    if (str == "ABORTED") {
        return attempt_state::ABORTED;
    }
    if (str == "COMMITTED") {
        return attempt_state::COMMITTED;
    }
    if (str == "COMPLETED") {
        return attempt_state::COMPLETED;
    }
    if (str == "ROLLED_BACK") {
        return attempt_state::ROLLED_BACK;
    }
    return attempt_state::UNKNOWN;
}
} // namespace couchbase::core::transactions
