# This file is part of cloud-init. See LICENSE file for license information.
import logging
from abc import ABC, abstractmethod
from typing import Iterable, List, Type

from cloudinit import subp, util
from cloudinit.net.eni import available as eni_available
from cloudinit.net.netplan import available as netplan_available
from cloudinit.net.network_manager import available as nm_available
from cloudinit.net.network_state import NetworkState
from cloudinit.net.networkd import available as networkd_available

LOG = logging.getLogger(__name__)


class NoActivatorException(Exception):
    pass


def _alter_interface(cmd, device_name) -> bool:
    LOG.debug("Attempting command %s for device %s", cmd, device_name)
    try:
        (_out, err) = subp.subp(cmd)
        if len(err):
            LOG.warning("Running %s resulted in stderr output: %s", cmd, err)
        return True
    except subp.ProcessExecutionError:
        util.logexc(LOG, "Running interface command %s failed", cmd)
        return False


class NetworkActivator(ABC):
    @staticmethod
    @abstractmethod
    def available() -> bool:
        """Return True if activator is available, otherwise return False."""
        raise NotImplementedError()

    @staticmethod
    @abstractmethod
    def bring_up_interface(device_name: str) -> bool:
        """Bring up interface.

        Return True is successful, otherwise return False
        """
        raise NotImplementedError()

    @staticmethod
    @abstractmethod
    def bring_down_interface(device_name: str) -> bool:
        """Bring down interface.

        Return True is successful, otherwise return False
        """
        raise NotImplementedError()

    @classmethod
    def bring_up_interfaces(cls, device_names: Iterable[str]) -> bool:
        """Bring up specified list of interfaces.

        Return True is successful, otherwise return False
        """
        return all(cls.bring_up_interface(device) for device in device_names)

    @classmethod
    def bring_up_all_interfaces(cls, network_state: NetworkState) -> bool:
        """Bring up all interfaces.

        Return True is successful, otherwise return False
        """
        return cls.bring_up_interfaces(
            [i["name"] for i in network_state.iter_interfaces()]
        )

    @classmethod
    def bring_down_interfaces(cls, device_names: Iterable[str]) -> bool:
        """Bring down specified list of interfaces.

        Return True is successful, otherwise return False
        """
        return all(cls.bring_down_interface(device) for device in device_names)

    @classmethod
    def bring_down_all_interfaces(cls, network_state: NetworkState) -> bool:
        """Bring down all interfaces.

        Return True is successful, otherwise return False
        """
        return cls.bring_down_interfaces(
            [i["name"] for i in network_state.iter_interfaces()]
        )


class IfUpDownActivator(NetworkActivator):
    # Note that we're not overriding bring_up_interfaces to pass something
    # like ifup --all because it isn't supported everywhere.
    # E.g., NetworkManager has a ifupdown plugin that requires the name
    # of a specific connection.
    @staticmethod
    def available(target=None) -> bool:
        """Return true if ifupdown can be used on this system."""
        return eni_available(target=target)

    @staticmethod
    def bring_up_interface(device_name: str) -> bool:
        """Bring up interface using ifup.

        Return True is successful, otherwise return False
        """
        cmd = ["ifup", device_name]
        return _alter_interface(cmd, device_name)

    @staticmethod
    def bring_down_interface(device_name: str) -> bool:
        """Bring up interface using ifup.

        Return True is successful, otherwise return False
        """
        cmd = ["ifdown", device_name]
        return _alter_interface(cmd, device_name)


class NetworkManagerActivator(NetworkActivator):
    @staticmethod
    def available(target=None) -> bool:
        """Return true if NetworkManager can be used on this system."""
        return nm_available(target=target)

    @staticmethod
    def bring_up_interface(device_name: str) -> bool:
        """Bring up connection using nmcli.

        Return True is successful, otherwise return False
        """
        from cloudinit.net.network_manager import conn_filename

        filename = conn_filename(device_name)
        cmd = ["nmcli", "connection", "load", filename]
        if _alter_interface(cmd, device_name):
            cmd = ["nmcli", "connection", "up", "filename", filename]
        else:
            _alter_interface(["nmcli", "connection", "reload"], device_name)
            cmd = ["nmcli", "connection", "up", "ifname", device_name]
        return _alter_interface(cmd, device_name)

    @staticmethod
    def bring_down_interface(device_name: str) -> bool:
        """Bring down interface using nmcli.

        Return True is successful, otherwise return False
        """
        cmd = ["nmcli", "device", "disconnect", device_name]
        return _alter_interface(cmd, device_name)


class NetplanActivator(NetworkActivator):
    NETPLAN_CMD = ["netplan", "apply"]

    @staticmethod
    def available(target=None) -> bool:
        """Return true if netplan can be used on this system."""
        return netplan_available(target=target)

    @staticmethod
    def bring_up_interface(device_name: str) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        LOG.debug(
            "Calling 'netplan apply' rather than "
            "altering individual interfaces"
        )
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")

    @staticmethod
    def bring_up_interfaces(device_names: Iterable[str]) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        LOG.debug(
            "Calling 'netplan apply' rather than "
            "altering individual interfaces"
        )
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")

    @staticmethod
    def bring_up_all_interfaces(network_state: NetworkState) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")

    @staticmethod
    def bring_down_interface(device_name: str) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        LOG.debug(
            "Calling 'netplan apply' rather than "
            "altering individual interfaces"
        )
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")

    @staticmethod
    def bring_down_interfaces(device_names: Iterable[str]) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        LOG.debug(
            "Calling 'netplan apply' rather than "
            "altering individual interfaces"
        )
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")

    @staticmethod
    def bring_down_all_interfaces(network_state: NetworkState) -> bool:
        """Apply netplan config.

        Return True is successful, otherwise return False
        """
        return _alter_interface(NetplanActivator.NETPLAN_CMD, "all")


class NetworkdActivator(NetworkActivator):
    @staticmethod
    def available(target=None) -> bool:
        """Return true if ifupdown can be used on this system."""
        return networkd_available(target=target)

    @staticmethod
    def bring_up_interface(device_name: str) -> bool:
        """Return True is successful, otherwise return False"""
        cmd = ["ip", "link", "set", "up", device_name]
        return _alter_interface(cmd, device_name)

    @staticmethod
    def bring_up_all_interfaces(network_state: NetworkState) -> bool:
        """Return True is successful, otherwise return False"""
        cmd = ["systemctl", "restart", "systemd-networkd", "systemd-resolved"]
        return _alter_interface(cmd, "all")

    @staticmethod
    def bring_down_interface(device_name: str) -> bool:
        """Return True is successful, otherwise return False"""
        cmd = ["ip", "link", "set", "down", device_name]
        return _alter_interface(cmd, device_name)


# This section is mostly copied and pasted from renderers.py. An abstract
# version to encompass both seems overkill at this point
DEFAULT_PRIORITY = [
    IfUpDownActivator,
    NetplanActivator,
    NetworkManagerActivator,
    NetworkdActivator,
]


def search_activator(
    priority=None, target=None
) -> List[Type[NetworkActivator]]:
    if priority is None:
        priority = DEFAULT_PRIORITY

    unknown = [i for i in priority if i not in DEFAULT_PRIORITY]
    if unknown:
        raise ValueError(
            "Unknown activators provided in priority list: %s" % unknown
        )

    return [activator for activator in priority if activator.available(target)]


def select_activator(priority=None, target=None) -> Type[NetworkActivator]:
    found = search_activator(priority, target)
    if not found:
        if priority is None:
            priority = DEFAULT_PRIORITY
        tmsg = ""
        if target and target != "/":
            tmsg = " in target=%s" % target
        raise NoActivatorException(
            "No available network activators found%s. Searched "
            "through list: %s" % (tmsg, priority)
        )
    selected = found[0]
    LOG.debug("Using selected activator: %s", selected)
    return selected