/*
 Copyright (c) 2020 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 <sdbusplus/asio/object_server.hpp>
#include <sdbusplus/server.hpp>
#include <xyz/openbmc_project/BIOSConfig/Manager/server.hpp>

#include <filesystem>
#include <string>

namespace bios_config
{

static constexpr auto service = "xyz.openbmc_project.BIOSConfigManager";
static constexpr auto objectPath = "/xyz/openbmc_project/bios_config/manager";
constexpr auto biosPersistFile = "biosData";

using Base = sdbusplus::xyz::openbmc_project::BIOSConfig::server::Manager;
namespace fs = std::filesystem;

/** @class Manager
 *
 *  @brief Implements the BIOS Manager
 */
class Manager : public Base
{
  public:
    using BaseTable = std::map<
        std::string,
        std::tuple<
            AttributeType, bool, std::string, std::string, std::string,
            std::variant<int64_t, std::string>,
            std::variant<int64_t, std::string>,
            std::vector<std::tuple<
                BoundType, std::variant<int64_t, std::string>, std::string>>>>;

    using oldBaseTable = std::map<
        std::string,
        std::tuple<AttributeType, bool, std::string, std::string, std::string,
                   std::variant<int64_t, std::string>,
                   std::variant<int64_t, std::string>,
                   std::vector<std::tuple<
                       BoundType, std::variant<int64_t, std::string>>>>>;

    using ResetFlag = std::map<std::string, ResetFlag>;

    using PendingAttributes =
        std::map<std::string,
                 std::tuple<AttributeType, std::variant<int64_t, std::string>>>;

    using PendingAttribute =
        std::tuple<AttributeType, std::variant<int64_t, std::string>>;

    using AttributeName = std::string;
    using AttributeValue = std::variant<int64_t, std::string>;
    using CurrentValue = std::variant<int64_t, std::string>;
    using PendingValue = std::variant<int64_t, std::string>;
    using AttributeDetails =
        std::tuple<AttributeType, CurrentValue, PendingValue>;

    Manager() = delete;
    ~Manager() = default;
    Manager(const Manager&) = delete;
    Manager& operator=(const Manager&) = delete;
    Manager(Manager&&) = delete;
    Manager& operator=(Manager&&) = delete;

    /** @brief Constructs Manager object.
     *
     *  @param[in] objectServer  - object server
     *  @param[in] systemBus - bus connection
     */
    Manager(sdbusplus::asio::object_server& objectServer,
            std::shared_ptr<sdbusplus::asio::connection>& systemBus,
            std::string persistPath);

    /** @brief Set the BIOS attribute with a new value, the new value is added
     *         to the PendingAttribute.
     *
     *  @param[in] attribute - attribute name
     *  @param[in] value - new value for the attribute
     *
     *  @return On error, throw exception
     */
    void setAttribute(AttributeName attribute, AttributeValue value) override;

    /** @brief Get the details of the BIOS attribute
     *
     *  @param[in] attribute - attribute name
     *
     *  @return On success, return the attribute details: attribute type,
     *          current value, pending value. On error, throw exception
     */
    AttributeDetails getAttribute(AttributeName attribute) override;

    /** @brief Set the BaseBIOSTable property and clears the PendingAttributes
     *         property
     *
     *  @param[in] value - new BaseBIOSTable
     *
     *  @return The new BaseBIOSTable that is applied.
     */
    BaseTable baseBIOSTable(BaseTable value) override;

    ResetFlag resetBIOSSettings(ResetFlag value);

    /** @brief Set the PendingAttributes property, additionally checks if the
     *         attributes are in the BaseBIOSTable, whether the attributes are
     *         read only and validate the attribute value based on the
     *         attribute type. PendingAttributes is cleared if value is empty.
     *
     *  @param[in] value - new PendingAttributes to append to the
     *                     PendingAttributes property
     *
     *  @return On success, return the new PendingAttributes property that is
     *          set.Throw exception if the validation fails.
     */
    PendingAttributes pendingAttributes(PendingAttributes value) override;

    /** @brief Convert the previosuly supported Base BIOS table to newly
     * supported Base BIOS table
     *
     *  @param[in] biosTbl - Old Base BIOS table (without VDN)
     *  @param[in] baseTable - Recently supported Base BIOS table (with VDN)
     *
     *  @return void
     *
     */
    void convertBiosDataToVersion1(Manager::oldBaseTable biosTbl,
                                   Manager::BaseTable& baseTable);

    /** @brief Convert the VDN supported Base BIOS table to old Base BIOS table
     *
     *  @param[in] biosTbl - Old Base BIOS table (without VDN)
     *  @param[in] baseTable - Recently supported Base BIOS table (with VDN)
     *
     *  @return void
     */
    void convertBiosDataToVersion0(Manager::oldBaseTable& baseTable,
                                   Manager::BaseTable& biosTbl);

  private:
    /** @enum Index into the fields in the BaseBIOSTable
     */
    enum class Index : uint8_t
    {
        attributeType = 0,
        readOnly,
        displayName,
        description,
        menuPath,
        currentValue,
        defaultValue,
        options,
    };

    bool validateEnumOption(
        const std::string& attrValue,
        const std::vector<std::tuple<
            BoundType, std::variant<int64_t, std::string>, std::string>>&
            options);

    bool validateStringOption(
        const std::string& attrValue,
        const std::vector<std::tuple<
            BoundType, std::variant<int64_t, std::string>, std::string>>&
            options);

    bool validateIntegerOption(
        const int64_t& attrValue,
        const std::vector<std::tuple<
            BoundType, std::variant<int64_t, std::string>, std::string>>&
            options);

    sdbusplus::asio::object_server& objServer;
    std::shared_ptr<sdbusplus::asio::connection>& systemBus;
    std::filesystem::path biosFile;
};

} // namespace bios_config