/*
Copyright (c) 2019 Intel Corporation

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 <nlohmann/json.hpp>

#include <array>
#include <charconv>
#include <cstddef>
#include <numeric>
#include <span>
#include <string>
#include <string_view>
#include <utility>

namespace redfish::registries
{
struct Header
{
    const char* copyright;
    const char* type;
    const char* id;
    const char* name;
    const char* language;
    const char* description;
    const char* registryPrefix;
    const char* registryVersion;
    const char* owningEntity;
};

struct Message
{
    const char* description;
    const char* message;
    const char* messageSeverity;
    const size_t numberOfArgs;
    std::array<const char*, 5> paramTypes;
    const char* resolution;
};
using MessageEntry = std::pair<const char*, const Message>;

inline std::string fillMessageArgs(
    const std::span<const std::string_view> messageArgs, std::string_view msg)
{
    std::string ret;
    size_t reserve = msg.size();
    for (std::string_view arg : messageArgs)
    {
        reserve += arg.size();
    }
    ret.reserve(reserve);

    for (size_t stringIndex = msg.find('%'); stringIndex != std::string::npos;
         stringIndex = msg.find('%'))
    {
        ret += msg.substr(0, stringIndex);
        msg.remove_prefix(stringIndex + 1);
        size_t number = 0;
        auto it = std::from_chars(msg.data(), &*msg.end(), number);
        if (it.ec != std::errc())
        {
            return "";
        }
        msg.remove_prefix(1);
        // Redfish message args are 1 indexed.
        number--;
        if (number >= messageArgs.size())
        {
            return "";
        }
        ret += messageArgs[number];
    }
    ret += msg;
    return ret;
}

inline nlohmann::json::object_t getLogFromRegistry(
    const Header& header, std::span<const MessageEntry> registry, size_t index,
    std::span<const std::string_view> args)
{
    const redfish::registries::MessageEntry& entry = registry[index];
    // Intentionally make a copy of the string, so we can append in the
    // parameters.
    std::string msg =
        redfish::registries::fillMessageArgs(args, entry.second.message);
    nlohmann::json jArgs = nlohmann::json::array();
    for (std::string_view arg : args)
    {
        jArgs.push_back(arg);
    }
    std::string msgId = header.id;
    msgId += ".";
    msgId += entry.first;

    nlohmann::json::object_t response;
    response["@odata.type"] = "#Message.v1_1_1.Message";
    response["MessageId"] = std::move(msgId);
    response["Message"] = std::move(msg);
    response["MessageArgs"] = std::move(jArgs);
    response["MessageSeverity"] = entry.second.messageSeverity;
    response["Resolution"] = entry.second.resolution;
    return response;
}

const Message* getMessage(std::string_view messageID);

const Message* getMessageFromRegistry(const std::string& messageKey,
                                      std::span<const MessageEntry> registry);

} // namespace redfish::registries