# SPDX-FileCopyrightText: 2020 The Magma Authors.
# SPDX-FileCopyrightText: 2022 Open Networking Foundation <support@opennetworking.org>
#
# SPDX-License-Identifier: BSD-3-Clause

import re

from exceptions import UnrecognizedEnodebError
from logger import EnodebdLogger as logger


class EnodebDeviceName:
    """
    This exists only to break a circular dependency. Otherwise there's no
    point of having these names for the devices
    """

    BAICELLS = "Baicells"
    BAICELLS_OLD = "Baicells Old"
    BAICELLS_QAFA = "Baicells QAFA"
    BAICELLS_QAFB = "Baicells QAFB"
    BAICELLS_RTS = "Baicells RTS"
    CAVIUM = "Cavium"
    SERCOMM = "Sercomm"


def get_device_name(device_oui: str, sw_version: str,) -> str:
    """
    Use the manufacturer organization unique identifier read during INFORM
    to select the TR data model used for configuration and status reports

    Qualcomm-based Baicells eNodeBs use a TR098-based model different
    from the Intel units. The software version on the Qualcomm models
    also further limits the model usable by that device.

    Args:
        device_oui: string, OUI representing device vendor
        sw_version: string, firmware version of eNodeB device

    Returns:
        DataModel
    """
    if device_oui in {"34ED0B", "48BF74"}:
        if sw_version.startswith("BaiBS_QAFB"):
            return EnodebDeviceName.BAICELLS_QAFB
        elif sw_version.startswith("BaiBS_QAFA"):
            return EnodebDeviceName.BAICELLS_QAFA
        elif sw_version.startswith("BaiStation_"):
            # Note: to disable flag inversion completely (for all builds),
            # set to BaiStation_V000R000C00B000SPC000
            # Note: to force flag inversion always (for all builds),
            # set to BaiStation_V999R999C99B999SPC999
            invert_before_version = _parse_sw_version(
                "BaiStation_V100R001C00B110SPC003"
            )
            if _parse_sw_version(sw_version) < invert_before_version:
                return EnodebDeviceName.BAICELLS_OLD
            return EnodebDeviceName.BAICELLS
        elif sw_version.startswith("BaiBS_RTS_"):
            return EnodebDeviceName.BAICELLS_RTS
        elif sw_version.startswith("BaiBS_RTSH_"):
            return EnodebDeviceName.BAICELLS_RTS
        else:
            raise UnrecognizedEnodebError(
                "Device %s unsupported: Software (%s)" % (device_oui, sw_version),
            )
    elif device_oui in {"000FB7", "744D28"}:
        return EnodebDeviceName.CAVIUM
    elif device_oui == "000E8F":
        return EnodebDeviceName.SERCOMM
    else:
        raise UnrecognizedEnodebError("Device %s unsupported" % device_oui)


def _parse_sw_version(version_str):
    """
    Parse SW version string.
    Expects format: BaiStation_V100R001C00B110SPC003
    For the above version string, returns: [100, 1, 0, 110, 3]
    Note: trailing characters (for dev builds) are ignored. Null is returned
    for version strings that don't match the above format.
    """
    logger.debug("Got firmware version: %s", version_str)

    version = re.findall(
        r"BaiStation_V(\d{3})R(\d{3})C(\d{2})B(\d{3})SPC(\d{3})", version_str,
    )
    if not version:
        return None
    elif len(version) > 1:
        logger.warning(
            "SW version (%s) not formatted as expected", version_str,
        )
    version_int = []
    for num in version[0]:
        try:
            version_int.append(int(num))
        except ValueError:
            logger.warning(
                "SW version (%s) not formatted as expected", version_str,
            )
            return None

    logger.debug("Parsed firmware version: %s", version_int)

    return version_int