import pwd
from abc import ABC, abstractmethod
from pathlib import Path
from typing import Dict, List, Optional, Set

from imav.contracts.config import MalwareTune
from defence360agent.utils import get_external_ip

TCP_PORTS_COMMON = [
    "20",
    "21",
    "22",
    "25",
    "53",
    "80",
    "110",
    "443",
    "587",
    "993",
    "995",
]


class PanelException(Exception):
    pass


class InvalidTokenException(Exception):
    pass


class AbstractPanel(ABC):
    """Abstract class that provides only basic hosting panel integration
    functionality."""

    NAME = "MINIMAL"
    OPEN_PORTS = {
        "tcp": {
            "in": ["465"] + TCP_PORTS_COMMON,
            "out": ["113"] + TCP_PORTS_COMMON,
        },
        "udp": {
            "in": ["20", "21", "53", "443"],
            "out": ["20", "21", "53", "113", "123"],
        },
    }
    exception = PanelException
    smtp_allow_users = []  # type: List[str]

    @classmethod
    @abstractmethod
    def is_installed(cls):
        """
        Checks if hosting panel installed on the known path
        :return: bool:
        """
        pass

    @classmethod
    def get_server_ip(cls):
        """
        Stub with external IP as currently
        only implementation for cPanel needed
        """
        return get_external_ip()

    @classmethod
    async def version(cls):
        return None

    @abstractmethod
    async def enable_imunify360_plugin(self, name=None):
        """
        Registers and enables Imunify360 UI plugin in hosting panel
        """
        pass

    @abstractmethod
    async def disable_imunify360_plugin(self, name=None):
        """
        UnRegisters Imunify360 UI plugin in hosting panel
        """
        pass

    @abstractmethod
    async def get_user_domains(self):
        """
        Returns domains hosted via control panel
        :return: list
        """
        pass

    @abstractmethod
    async def get_users(self) -> List[str]:
        """
        Returns system users from hosting panel
        :return: list
        """
        pass

    @abstractmethod
    async def get_domain_to_owner(self) -> Dict[str, List[str]]:
        """
        Returns dict with domain to list of users pairs
        """
        pass

    @abstractmethod
    async def get_domains_per_user(self) -> Dict[str, List[str]]:
        """
        Returns dict with user to list of domains pairs
        """
        pass

    async def get_user_details(self) -> Dict[str, Dict[str, str]]:
        """
        Returns dict with user to email pairs
        """

        return {
            user: {"email": "", "locale": ""}
            for user in await self.get_users()
        }

    async def users_count(self) -> int:
        return len(list(await self.get_users()))

    def authenticate(self, protocol, data: dict):
        """
        Performs actions to distinguish endusers from admins
        :param protocol: _RpcServerProtocol
        :param data: parsed params
        :returns (user_type, user_name)
        """
        name = None
        if protocol._uid != 0:
            # we can get here if a non-root web panel user visits i360 UI
            # To emulate it:
            # su -s /bin/bash -c
            #  $'echo \'{"command":["config", "show"],"params":{}}\'
            #    | nc -U -w1 \
            #    /var/run/defence360agent/non_root_simple_rpc.sock'
            #  fakeuser
            pw = pwd.getpwuid(protocol._uid)
            name = pw.pw_name
        return protocol.user, name

    @classmethod
    def get_modsec_config_path(cls):
        raise NotImplementedError

    def get_SMTP_conflict_status(self) -> bool:
        """
        Return Conflict status
        """
        return False

    @abstractmethod
    def basedirs(self) -> Set[str]:
        pass

    @classmethod
    def base_home_dir(cls, home_dir: str) -> Path:
        base_dir = Path(home_dir).resolve().parent
        return base_dir

    @classmethod
    def get_rapid_scan_db_dir(cls, home_dir: str) -> Optional[str]:
        try:
            base_dir = cls.base_home_dir(home_dir)
            resolved_home = Path(home_dir).resolve()
            tail = resolved_home.relative_to(base_dir)
        # Symbolic link loop could cause runtime error
        except (ValueError, RuntimeError):
            return None

        if rapid_scan_basedir_override := getattr(
            MalwareTune, "RAPID_SCAN_BASEDIR_OVERRIDE", None
        ):
            base_dir = rapid_scan_basedir_override

        return str(base_dir / ".rapid-scan-db" / tail)

    @classmethod
    async def retrieve_key(cls) -> str:
        """
        Returns registration key from panel, if possible, raise
        PanelException if not successful (or wrong panel key provided),
        or NoImplemented if method not supported
        by the panel.
        """
        raise NotImplementedError

    @classmethod
    async def notify(cls, *, message_type, params, user=None):
        """
        Notify a customer using the panel internal tooling
        """
        return None

    @abstractmethod
    async def list_docroots(self) -> Dict[str, str]:
        """
        :return dict with docroot to domain
        """
        pass


def ensure_valid_panel(**dec_kwargs):
    """
    Run function only if hosting panel is installed,
    elsewhere raise PanelException

    This method is intended to be used as a decorator on AbstractPanel instance
    methods.

    :raise PanelException:
    :param dec_kwargs: kwargs passed to is_installed function
    :return:
    """

    def real_decorator(fn):
        """
        :param fn: coroutine
        """

        async def wrapper(self, *args, **kwargs):
            if not self.is_installed(**dec_kwargs):
                raise self.exception(
                    "%s is not valid!" % self.__class__.__name__
                )
            return await fn(self, *args, **kwargs)

        return wrapper

    return real_decorator


class ModsecVendorsError(Exception):
    """
    Raises when its impossible to get modsec vendor
    """

    pass