/**
 *    Copyright (C) 2022-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/executor/async_rpc_error_info.h"
#include "mongo/executor/remote_command_request.h"
#include "mongo/util/duration.h"
#include "mongo/util/time_support.h"
#include <string>

namespace mongo::async_rpc {

template <auto Start, auto End, auto Inc, class F>
constexpr void constexprFor(F&& f) {
    if constexpr (Start < End) {
        f(std::integral_constant<decltype(Start), Start>());
        constexprFor<Start + Inc, End, Inc>(f);
    }
}
class RetryPolicy {
public:
    virtual ~RetryPolicy() = default;
    /**
     * Records any necessary retry metadata and returns true if a command should be retried based on
     * the policy conditions and input status.
     */
    virtual bool recordAndEvaluateRetry(Status s) = 0;

    /**
     * After each decision to retry the remote command, this function
     * is called to obtain how long to wait before that retry is attempted.
     */
    virtual Milliseconds getNextRetryDelay() = 0;

    virtual BSONObj toBSON() const {
        return {};
    };
};

class NeverRetryPolicy : public RetryPolicy {
public:
    bool recordAndEvaluateRetry(Status s) override final {
        return false;
    }

    Milliseconds getNextRetryDelay() override final {
        return Milliseconds::zero();
    }

    BSONObj toBSON() const override final {
        return BSON("retryPolicyType"
                    << "NeverRetryPolicy");
    }
};

namespace helpers {
/** Returns true if the given status is in any of the given ErrorCategories. */
template <ErrorCategory... cats>
bool isAnyCategory(Status status) {
    return (ErrorCodes::isA<cats>(status) || ...);
}
}  // namespace helpers

template <ErrorCategory... Categories>
class RetryWithBackoffOnErrorCategories : public RetryPolicy {
public:
    RetryWithBackoffOnErrorCategories(Backoff backoff) : _backoff{backoff} {}
    bool recordAndEvaluateRetry(Status status) override {
        return helpers::isAnyCategory<Categories...>(status);
    }
    Milliseconds getNextRetryDelay() override final {
        return _backoff.nextSleep();
    }
    Backoff _backoff;
};

}  // namespace mongo::async_rpc