#pragma once

#include "MctpEndpoint.hpp"
#include "NVMeError.hpp"

#include <libnvme-mi.h>

#include <cstdint>
#include <functional>
#include <memory>
#include <span>
#include <variant>

class NVMeBasicIntf;
class NVMeMiIntf;
struct NVMeNSIdentify;
/**
 * @brief a container class to hold smart ptr to NVMe Basic or NVMe MI
 * implementation instance
 */
class NVMeIntf
{
  public:
    enum class Protocol : uint8_t
    {
        NVMeBasic,
        NVMeMI,
    };

    NVMeIntf() = default;

    template <class IntfImpl, class... Args>
    static NVMeIntf create(Args&&... args)
    {
        NVMeIntf nvmeIntf;
        if constexpr (std::is_base_of_v<NVMeBasicIntf, IntfImpl>)
        {
            nvmeIntf.interface =
                std::make_shared<IntfImpl>(std::forward<Args>(args)...);
            return nvmeIntf;
        }

        if constexpr (std::is_base_of_v<NVMeMiIntf, IntfImpl>)
        {
            nvmeIntf.interface =
                std::make_shared<IntfImpl>(std::forward<Args>(args)...);
            return nvmeIntf;
        }

        throw std::runtime_error("Unsupported NVMe interface");
    }

    auto getInferface()
    {
        return interface;
    }

    Protocol getProtocol()
    {
        if (std::holds_alternative<std::shared_ptr<NVMeBasicIntf>>(interface))
        {
            return Protocol::NVMeBasic;
        }
        if (std::holds_alternative<std::shared_ptr<NVMeMiIntf>>(interface))
        {
            return Protocol::NVMeMI;
        }

        throw std::runtime_error("uninitiated NVMeIntf");
    }

  private:
    std::variant<std::shared_ptr<NVMeBasicIntf>, std::shared_ptr<NVMeMiIntf>>
        interface;
};

/**
 * @brief Interface to get information via NVMe MI Basic CMD protocol.
 *
 * Can be used for implementation or mockup
 */
class NVMeBasicIntf
{
  public:
    struct DriveStatus
    {
        uint8_t Status;
        uint8_t SmartWarnings;
        uint8_t Temp;
        uint8_t DriveLifeUsed;
        uint8_t WarningTemp;
        uint8_t PowerState;
    };

    enum StatusFlags : uint8_t
    {
        NVME_MI_BASIC_SFLGS_DRIVE_NOT_READY = 0x40,
        NVME_MI_BASIC_SFLGS_DRIVE_FUNCTIONAL = 0x20,
    };

    NVMeBasicIntf() = default;

    // The i2c bus number
    virtual int getBus() const = 0;
    // The i2c address for NVMe Basic
    virtual int getAddress() const = 0;

    // Get NVMe drive status, data address is from 00h~07h
    virtual void getStatus(
        std::function<void(const std::error_code&, DriveStatus*)>&& cb) = 0;

    virtual ~NVMeBasicIntf() = default;
};

class NVMeMiIntf
{
  public:
    constexpr static std::string_view statusToString(nvme_mi_resp_status status)
    {
        switch (status)
        {
            case NVME_MI_RESP_SUCCESS:
                return "success";
            case NVME_MI_RESP_MPR:
                return "More Processing Required";
            case NVME_MI_RESP_INTERNAL_ERR:
                return "Internal Error";
            case NVME_MI_RESP_INVALID_OPCODE:
                return "Invalid command opcode";
            case NVME_MI_RESP_INVALID_PARAM:
                return "Invalid command parameter";
            case NVME_MI_RESP_INVALID_CMD_SIZE:
                return "Invalid command size";
            case NVME_MI_RESP_INVALID_INPUT_SIZE:
                return "Invalid command input data size";
            case NVME_MI_RESP_ACCESS_DENIED:
                return "Access Denied";
            case NVME_MI_RESP_VPD_UPDATES_EXCEEDED:
                return "More VPD updates than allowed";
            case NVME_MI_RESP_PCIE_INACCESSIBLE:
                return "PCIe functionality currently unavailable";
            case NVME_MI_RESP_MEB_SANITIZED:
                return "MEB has been cleared due to sanitize";
            case NVME_MI_RESP_ENC_SERV_FAILURE:
                return "Enclosure services process failed";
            case NVME_MI_RESP_ENC_SERV_XFER_FAILURE:
                return "Transfer with enclosure services failed";
            case NVME_MI_RESP_ENC_FAILURE:
                return "Unreoverable enclosure failure";
            case NVME_MI_RESP_ENC_XFER_REFUSED:
                return "Enclosure services transfer refused";
            case NVME_MI_RESP_ENC_FUNC_UNSUP:
                return "Unsupported enclosure services function";
            case NVME_MI_RESP_ENC_SERV_UNAVAIL:
                return "Enclosure services unavailable";
            case NVME_MI_RESP_ENC_DEGRADED:
                return "Noncritical failure detected by enc. services";
            case NVME_MI_RESP_SANITIZE_IN_PROGRESS:
                return "Command prohibited during sanitize";
            default:
                return "";
        }
        return "";
    }

    virtual void miSubsystemHealthStatusPoll(
        std::function<void(const std::error_code&,
                           nvme_mi_nvm_ss_health_status*)>&& cb) = 0;
    virtual void
        miScanCtrl(std::function<void(const std::error_code&,
                                      const std::vector<nvme_mi_ctrl_t>&)>
                       cb) = 0;

    virtual void start(const std::shared_ptr<MctpEndpoint>& ep) = 0;
    virtual void stop() = 0;
    virtual void recover() = 0;

    virtual ~NVMeMiIntf() = default;

    virtual bool flushOperations(std::function<void()>&& cb) = 0;
    virtual void adminIdentify(
        nvme_mi_ctrl_t ctrl, nvme_identify_cns cns, uint32_t nsid,
        uint16_t cntid,
        std::function<void(nvme_ex_ptr, std::span<uint8_t>)>&& cb) = 0;
    virtual void adminGetLogPage(
        nvme_mi_ctrl_t ctrl, nvme_cmd_get_log_lid lid, uint32_t nsid,
        uint8_t lsp, uint16_t lsi,
        std::function<void(const std::error_code&, std::span<uint8_t>)>&&
            cb) = 0;
    virtual void adminFwCommit(nvme_mi_ctrl_t ctrl, nvme_fw_commit_ca action,
                               uint8_t slot, bool bpid,
                               std::function<void(const std::error_code&,
                                                  nvme_status_field)>&& cb) = 0;

    virtual void adminFwDownload(
        nvme_mi_ctrl_t ctrl, std::string firmwarefile,
        std::function<void(const std::error_code&, nvme_status_field)>&&
            cb) = 0;

    virtual void adminSecuritySend(
        nvme_mi_ctrl_t ctrl, uint8_t proto, uint16_t protoSpecific,
        std::span<uint8_t> data,
        std::function<void(const std::error_code&, int nvmeStatus)>&& cb) = 0;

    virtual void adminSecurityReceive(
        nvme_mi_ctrl_t ctrl, uint8_t proto, uint16_t protoSpecific,
        uint32_t transferLength,
        std::function<void(const std::error_code&, int nvmeStatus,
                           const std::span<uint8_t> data)>&& cb) = 0;

    virtual void adminNonDataCmd(
        nvme_mi_ctrl_t ctrl, uint8_t opcode, uint32_t cdw1, uint32_t cdw2,
        uint32_t cdw3, uint32_t cdw10, uint32_t cdw11, uint32_t cdw12,
        uint32_t cdw13, uint32_t cdw14, uint32_t cdw15,
        std::function<void(const std::error_code&, int nvmeStatus,
                           uint32_t comptionDw0)>&& cb) = 0;

    virtual void createNamespace(
        nvme_mi_ctrl_t ctrl, uint64_t size, size_t lbaFormat,
        bool metadataAtEnd, std::function<void(nvme_ex_ptr ex)>&& submittedCb,
        std::function<void(nvme_ex_ptr ex, NVMeNSIdentify newid)>&&
            finishedCb) = 0;

    virtual void adminDeleteNamespace(
        nvme_mi_ctrl_t ctrl, uint32_t nsid,
        std::function<void(const std::error_code&, int nvmeStatus)>&& cb) = 0;

    /**
     * listNamespaces() - return list of NSIDs
     *
     * @cb will be called on success or failure. On success @ns will
     * contain the list of NSIDs in sequential order, including inactive
     * namespaces.
     */
    virtual void adminListNamespaces(
        nvme_mi_ctrl_t ctrl,
        std::function<void(nvme_ex_ptr ex, std::vector<uint32_t> ns)>&& cb) = 0;

    virtual void adminAttachDetachNamespace(
        nvme_mi_ctrl_t ctrl, uint16_t ctrlid, uint32_t nsid, bool attach,
        std::function<void(const std::error_code&, int nvmeStatus)>&& cb) = 0;

    virtual void adminSanitize(nvme_mi_ctrl_t ctrl,
                               enum nvme_sanitize_sanact sanact, uint8_t passes,
                               uint32_t pattern, bool invertPattern,
                               std::function<void(nvme_ex_ptr ex)>&& cb) = 0;

    /**
     * adminXfer() -  Raw admin transfer interface.
     * @ctrl: controller to send the admin command to
     * @admin_req: request header
     * @data: request data payload
     * @timeout_ms: timeout in ms
     * @resp_data_offset: offset into request data to retrieve from controller
     * @cb: callback function after the response received.
     * @ec: error code
     * @admin_resp: response header
     * @resp_data: response data payload
     *
     * Performs an arbitrary NVMe Admin command, using the provided request
     * header, in @admin_req. The requested data is attached by @data, if any.
     *
     * On success, @cb will be called and response header and data are stored in
     * @admin_resp and @resp_data, which has an optional appended payload
     * buffer. The response data does not include the Admin request header, so 0
     * represents no payload.
     *
     * As with all Admin commands, we can request partial data from the Admin
     * Response payload, offset by @resp_data_offset. In case of resp_data
     * contains only partial data of the caller's requirement, a follow-up call
     * to adminXfer with offset is required.
     *
     * See: &struct nvme_mi_admin_req_hdr and &struct nvme_mi_admin_resp_hdr.
     *
     * @ec will be returned on failure.
     */
    virtual void
        adminXfer(nvme_mi_ctrl_t ctrl, const nvme_mi_admin_req_hdr& adminReq,
                  std::span<uint8_t> data, unsigned int timeoutMs,
                  std::function<void(const std::error_code& ec,
                                     const nvme_mi_admin_resp_hdr& adminResp,
                                     std::span<uint8_t> respData)>&& cb) = 0;

    virtual void adminLockdownInband(
        nvme_mi_ctrl_t ctrl, uint8_t prohibit,
        const std::vector<uint8_t>& adminCmds,
        const std::vector<uint8_t>& features,
        std::function<void(
            const std::error_code&, int nvmeStatus, uint32_t comptionDw0,
            const std::string& failureScope, uint32_t failureId)>&& cb) = 0;
};

/* A subset of Namespace Identify details of interest */
struct NVMeNSIdentify
{
    uint32_t namespaceId;
    uint64_t size;
    uint64_t capacity;
    size_t blockSize;
    size_t lbaFormat;
    bool metadataAtEnd;
};