/**
 *    Copyright (C) 2024-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.
 */

#include "mongo/db/write_concern_idl.h"

#include <fmt/format.h>

#include "mongo/base/error_codes.h"
#include "mongo/bson/bsontypes.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/repl/repl_set_config.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/duration.h"

namespace mongo {
// Helpers for IDL parsing
WriteConcernW deserializeWriteConcernW(BSONElement wEl) {
    using namespace fmt::literals;
    if (wEl.isNumber()) {
        uassert(ErrorCodes::FailedToParse, "w cannot be NaN", !wEl.isNaN());
        auto wNum = wEl.safeNumberLong();
        if (wNum < 0 || wNum > static_cast<long long>(repl::ReplSetConfig::kMaxMembers)) {
            uasserted(ErrorCodes::FailedToParse,
                      "w has to be a non-negative number and not greater than {}; found: {}"_format(
                          repl::ReplSetConfig::kMaxMembers, wNum));
        }

        return WriteConcernW{wNum};
    } else if (wEl.type() == BSONType::String) {
        return WriteConcernW{wEl.str()};
    } else if (wEl.type() == BSONType::Object) {
        auto wTags = wEl.Obj();
        uassert(ErrorCodes::FailedToParse, "tagged write concern requires tags", !wTags.isEmpty());

        WTags tags;
        for (auto&& e : wTags) {
            uassert(
                ErrorCodes::FailedToParse,
                "tags must be a single level document with only number values; found: {}"_format(
                    e.toString()),
                e.isNumber());

            tags.try_emplace(e.fieldName(), e.safeNumberInt());
        }

        return WriteConcernW{std::move(tags)};
    } else if (wEl.eoo() || wEl.type() == BSONType::jstNULL || wEl.type() == BSONType::Undefined) {
        return WriteConcernW{};
    }
    uasserted(ErrorCodes::FailedToParse,
              "w has to be a number, string, or object; found: {}"_format(typeName(wEl.type())));
}

void serializeWriteConcernW(const WriteConcernW& w, StringData fieldName, BSONObjBuilder* builder) {
    visit(OverloadedVisitor{[&](int64_t wNumNodes) {
                                builder->appendNumber(fieldName, static_cast<long long>(wNumNodes));
                            },
                            [&](std::string wMode) { builder->append(fieldName, wMode); },
                            [&](WTags wTags) {
                                builder->append(fieldName, wTags);
                            }},
          w);
}

std::int64_t parseWTimeoutFromBSON(BSONElement element) {
    // Store wTimeout as a 64-bit value but functionally limit it to int32 as values larger than
    // than that do not make much sense to use and were not previously supported.
    constexpr std::array<mongo::BSONType, 4> validTypes{
        NumberLong, NumberInt, NumberDecimal, NumberDouble};
    bool isValidType = std::any_of(
        validTypes.begin(), validTypes.end(), [&](auto type) { return element.type() == type; });

    auto value = isValidType ? element.safeNumberLong() : 0;
    uassert(ErrorCodes::FailedToParse,
            "wtimeout must be a 32-bit integer",
            value <= std::numeric_limits<int32_t>::max());
    return value;
}

void serializeWTimeout(std::int64_t wTimeout, StringData fieldName, BSONObjBuilder* builder) {
    // Historically we have serialized this as a int32_t, even though it is defined as an
    // int64_t in our IDL format.
    builder->append(fieldName, static_cast<int32_t>(wTimeout));
}

}  // namespace mongo