/*
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 "async_resp.hpp"
#include "dbus_utility.hpp"
#include "error_messages.hpp"

#include <boost/system/error_code.hpp>
#include <sdbusplus/asio/property.hpp>

#include <array>
#include <charconv>
#include <ranges>
#include <string_view>

namespace redfish
{

enum NetworkProtocolUnitStructFields
{
    NET_PROTO_UNIT_NAME,
    NET_PROTO_UNIT_DESC,
    NET_PROTO_UNIT_LOAD_STATE,
    NET_PROTO_UNIT_ACTIVE_STATE,
    NET_PROTO_UNIT_SUB_STATE,
    NET_PROTO_UNIT_DEVICE,
    NET_PROTO_UNIT_OBJ_PATH,
    NET_PROTO_UNIT_ALWAYS_0,
    NET_PROTO_UNIT_ALWAYS_EMPTY,
    NET_PROTO_UNIT_ALWAYS_ROOT_PATH
};

enum NetworkProtocolListenResponseElements
{
    NET_PROTO_LISTEN_TYPE,
    NET_PROTO_LISTEN_STREAM
};

/**
 * @brief D-Bus Unit structure returned in array from ListUnits Method
 */
using UnitStruct =
    std::tuple<std::string, std::string, std::string, std::string, std::string,
               std::string, sdbusplus::message::object_path, uint32_t,
               std::string, sdbusplus::message::object_path>;

template <typename CallbackFunc>
void getMainChassisId(const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
                      CallbackFunc&& callback)
{
    // Find managed chassis
    constexpr std::array<std::string_view, 2> interfaces = {
        "xyz.openbmc_project.Inventory.Item.Board",
        "xyz.openbmc_project.Inventory.Item.Chassis"};
    dbus::utility::getSubTree(
        "/xyz/openbmc_project/inventory", 0, interfaces,
        [callback = std::forward<CallbackFunc>(callback),
         asyncResp](const boost::system::error_code& ec,
                    const dbus::utility::MapperGetSubTreeResponse& subtree) {
            if (ec)
            {
                BMCWEB_LOG_ERROR("{}", ec);
                return;
            }
            if (subtree.empty())
            {
                BMCWEB_LOG_DEBUG("Can't find chassis!");
                return;
            }

            std::size_t idPos = subtree[0].first.rfind('/');
            if (idPos == std::string::npos ||
                (idPos + 1) >= subtree[0].first.size())
            {
                messages::internalError(asyncResp->res);
                BMCWEB_LOG_DEBUG("Can't parse chassis ID!");
                return;
            }
            std::string chassisId = subtree[0].first.substr(idPos + 1);
            BMCWEB_LOG_DEBUG("chassisId = {}", chassisId);
            callback(chassisId, asyncResp);
        });
}

template <typename CallbackFunc>
void getPortStatusAndPath(
    std::span<const std::pair<std::string_view, std::string_view>>
        protocolToDBus,
    CallbackFunc&& callback)
{
    crow::connections::systemBus->async_method_call(
        [protocolToDBus, callback = std::forward<CallbackFunc>(callback)](
            const boost::system::error_code& ec,
            const std::vector<UnitStruct>& r) {
            std::vector<std::tuple<std::string, std::string, bool>> socketData;
            if (ec)
            {
                BMCWEB_LOG_ERROR("{}", ec);
                // return error code
                callback(ec, socketData);
                return;
            }

            // save all service output into vector
            for (const UnitStruct& unit : r)
            {
                // Only traverse through <xyz>.socket units
                const std::string& unitName =
                    std::get<NET_PROTO_UNIT_NAME>(unit);

                // find "." into unitsName
                size_t lastCharPos = unitName.rfind('.');
                if (lastCharPos == std::string::npos)
                {
                    continue;
                }

                // is unitsName end with ".socket"
                std::string unitNameEnd = unitName.substr(lastCharPos);
                if (unitNameEnd != ".socket")
                {
                    continue;
                }

                // find "@" into unitsName
                if (size_t atCharPos = unitName.rfind('@');
                    atCharPos != std::string::npos)
                {
                    lastCharPos = atCharPos;
                }

                // unitsName without "@eth(x).socket", only <xyz>
                // unitsName without ".socket", only <xyz>
                std::string unitNameStr = unitName.substr(0, lastCharPos);

                for (const auto& kv : protocolToDBus)
                {
                    // We are interested in services, which starts with
                    // mapped service name
                    if (unitNameStr != kv.second)
                    {
                        continue;
                    }

                    const std::string& socketPath =
                        std::get<NET_PROTO_UNIT_OBJ_PATH>(unit);
                    const std::string& unitState =
                        std::get<NET_PROTO_UNIT_SUB_STATE>(unit);

                    bool isProtocolEnabled = ((unitState == "running") ||
                                              (unitState == "listening"));

                    // Some protocols may have multiple services associated with
                    // them (for example IPMI). Look to see if we've already
                    // added an entry for the current protocol.
                    auto find = std::ranges::find_if(
                        socketData,
                        [&kv](const std::tuple<std::string, std::string, bool>&
                                  i) { return std::get<1>(i) == kv.first; });
                    if (find != socketData.end())
                    {
                        // It only takes one enabled systemd service to consider
                        // a protocol enabled so if the current entry already
                        // has it enabled (or the new one is disabled) then just
                        // continue, otherwise remove the current one and add
                        // this new one.
                        if (std::get<2>(*find) || !isProtocolEnabled)
                        {
                            // Already registered as enabled or current one is
                            // not enabled, nothing to do
                            BMCWEB_LOG_DEBUG(
                                "protocolName: {}, already true or current one is false: {}",
                                kv.first, isProtocolEnabled);
                            break;
                        }
                        // Remove existing entry and replace with new one
                        // (below)
                        socketData.erase(find);
                    }

                    socketData.emplace_back(socketPath, std::string(kv.first),
                                            isProtocolEnabled);
                    // We found service, return from inner loop.
                    break;
                }
            }

            callback(ec, socketData);
        },
        "org.freedesktop.systemd1", "/org/freedesktop/systemd1",
        "org.freedesktop.systemd1.Manager", "ListUnits");
}

template <typename CallbackFunc>
void getPortNumber(const std::string& socketPath, CallbackFunc&& callback)
{
    dbus::utility::getProperty<
        std::vector<std::tuple<std::string, std::string>>>(
        *crow::connections::systemBus, "org.freedesktop.systemd1", socketPath,
        "org.freedesktop.systemd1.Socket", "Listen",
        [callback = std::forward<CallbackFunc>(callback)](
            const boost::system::error_code& ec,
            const std::vector<std::tuple<std::string, std::string>>& resp) {
            if (ec)
            {
                BMCWEB_LOG_ERROR("{}", ec);
                callback(ec, 0);
                return;
            }
            if (resp.empty())
            {
                // Network Protocol Listen Response Elements is empty
                boost::system::error_code ec1 =
                    boost::system::errc::make_error_code(
                        boost::system::errc::bad_message);
                // return error code
                callback(ec1, 0);
                BMCWEB_LOG_ERROR("{}", ec1);
                return;
            }
            const std::string& listenStream =
                std::get<NET_PROTO_LISTEN_STREAM>(resp[0]);
            const char* pa = &listenStream[listenStream.rfind(':') + 1];
            int port{0};
            if (auto [p, ec2] = std::from_chars(pa, nullptr, port);
                ec2 != std::errc())
            {
                // there is only two possibility invalid_argument and
                // result_out_of_range
                boost::system::error_code ec3 =
                    boost::system::errc::make_error_code(
                        boost::system::errc::invalid_argument);
                if (ec2 == std::errc::result_out_of_range)
                {
                    ec3 = boost::system::errc::make_error_code(
                        boost::system::errc::result_out_of_range);
                }
                // return error code
                callback(ec3, 0);
                BMCWEB_LOG_ERROR("{}", ec3);
            }
            callback(ec, port);
        });
}

} // namespace redfish