"""
A collection of mixins useful for the various *Client interfaces
"""

import copy
import fnmatch
import logging
import os
import signal
import traceback
import weakref
from collections.abc import Mapping, MutableMapping

import salt._logging
import salt.channel.client
import salt.exceptions
import salt.ext.tornado.stack_context
import salt.minion
import salt.output
import salt.utils.args
import salt.utils.doc
import salt.utils.error
import salt.utils.event
import salt.utils.jid
import salt.utils.job
import salt.utils.lazy
import salt.utils.platform
import salt.utils.process
import salt.utils.state
import salt.utils.user
import salt.utils.versions

log = logging.getLogger(__name__)

CLIENT_INTERNAL_KEYWORDS = frozenset(
    [
        "client",
        "cmd",
        "eauth",
        "fun",
        "kwarg",
        "match",
        "token",
        "__jid__",
        "__tag__",
        "__user__",
        "username",
        "password",
        "full_return",
        "print_event",
    ]
)


class ClientFuncsDict(MutableMapping):
    """
    Class to make a read-only dict for accessing runner funcs "directly"
    """

    def __init__(self, client):
        self.client = client

    def __getattr__(self, attr):
        """
        Provide access eg. to 'pack'
        """
        return getattr(self.client.functions, attr)

    def __setitem__(self, key, val):
        raise NotImplementedError()

    def __delitem__(self, key):
        raise NotImplementedError()

    def __getitem__(self, key):
        """
        Return a function that you can call with regular func params, but
        will do all the _proc_function magic
        """
        if key not in self.client.functions:
            raise KeyError

        def wrapper(*args, **kwargs):
            low = {
                "fun": key,
                "args": args,
                "kwargs": kwargs,
            }
            pub_data = {}
            # Copy kwargs keys so we can iterate over and pop the pub data
            kwargs_keys = list(kwargs)

            # pull out pub_data if you have it
            for kwargs_key in kwargs_keys:
                if kwargs_key.startswith("__pub_"):
                    pub_data[kwargs_key] = kwargs.pop(kwargs_key)

            async_pub = self.client._gen_async_pub(pub_data.get("__pub_jid"))

            user = salt.utils.user.get_specific_user()
            return self.client._proc_function(
                instance=self.client,
                opts=self.client.opts,
                fun=key,
                low=low,
                user=user,
                tag=async_pub["tag"],
                jid=async_pub["jid"],
                daemonize=False,
            )

        return wrapper

    def __len__(self):
        return len(self.client.functions)

    def __iter__(self):
        return iter(self.client.functions)


class ClientStateMixin:
    def __init__(self, opts, context=None):
        self.opts = opts
        if context is None:
            context = {}
        self.context = context

    # __setstate__ and __getstate__ are only used on spawning platforms.
    def __getstate__(self):
        return {
            "opts": self.opts,
            "context": self.context or None,
        }

    def __setstate__(self, state):
        # If __setstate__ is getting called it means this is running on a new process.
        self.__init__(state["opts"], context=state["context"])


class SyncClientMixin(ClientStateMixin):
    """
    A mixin for *Client interfaces to abstract common function execution
    """

    functions = ()

    def functions_dict(self):
        """
        Return a dict that will mimic the "functions" dict used all over salt.
        It creates a wrapper around the function allowing **kwargs, and if pub_data
        is passed in as kwargs, will re-use the JID passed in
        """
        return ClientFuncsDict(self)

    def master_call(self, **kwargs):
        """
        Execute a function through the master network interface.
        """
        load = kwargs
        load["cmd"] = self.client

        with salt.channel.client.ReqChannel.factory(
            self.opts, crypt="clear", usage="master_call"
        ) as channel:
            ret = channel.send(load)
            if isinstance(ret, Mapping):
                if "error" in ret:
                    salt.utils.error.raise_error(**ret["error"])
            return ret

    def cmd_sync(self, low, timeout=None, full_return=False):
        """
        Execute a runner function synchronously; eauth is respected

        This function requires that :conf_master:`external_auth` is configured
        and the user is authorized to execute runner functions: (``@runner``).

        .. code-block:: python

            runner.eauth_sync({
                'fun': 'jobs.list_jobs',
                'username': 'saltdev',
                'password': 'saltdev',
                'eauth': 'pam',
            })
        """
        with salt.utils.event.get_master_event(
            self.opts, self.opts["sock_dir"], listen=True
        ) as event:
            job = self.master_call(**low)
            ret_tag = salt.utils.event.tagify("ret", base=job["tag"])

            if timeout is None:
                timeout = self.opts.get("rest_timeout", 300)
            ret = event.get_event(
                tag=ret_tag, full=True, wait=timeout, auto_reconnect=True
            )
            if ret is None:
                raise salt.exceptions.SaltClientTimeout(
                    "RunnerClient job '{}' timed out".format(job["jid"]),
                    jid=job["jid"],
                )

            return ret if full_return else ret["data"]["return"]

    def cmd(
        self,
        fun,
        arg=None,
        pub_data=None,
        kwarg=None,
        print_event=True,
        full_return=False,
    ):
        """
        Execute a function
        """
        if arg is None:
            arg = tuple()
        if not isinstance(arg, list) and not isinstance(arg, tuple):
            raise salt.exceptions.SaltInvocationError(
                "arg must be formatted as a list/tuple"
            )
        if pub_data is None:
            pub_data = {}
        if not isinstance(pub_data, dict):
            raise salt.exceptions.SaltInvocationError(
                "pub_data must be formatted as a dictionary"
            )
        if kwarg is None:
            kwarg = {}
        if not isinstance(kwarg, dict):
            raise salt.exceptions.SaltInvocationError(
                "kwarg must be formatted as a dictionary"
            )
        arglist = salt.utils.args.parse_input(
            arg, no_parse=self.opts.get("no_parse", [])
        )

        # if you were passed kwarg, add it to arglist
        if kwarg:
            kwarg["__kwarg__"] = True
            arglist.append(kwarg)

        args, kwargs = salt.minion.load_args_and_kwargs(
            self.functions[fun], arglist, pub_data
        )
        low = {"fun": fun, "arg": args, "kwarg": kwargs}
        return self.low(fun, low, print_event=print_event, full_return=full_return)

    @property
    def mminion(self):
        if not hasattr(self, "_mminion"):
            self._mminion = salt.minion.MasterMinion(
                self.opts, states=False, rend=False
            )
        return self._mminion

    @property
    def store_job(self):
        """
        Helper that allows us to turn off storing jobs for different classes
        that may incorporate this mixin.
        """
        try:
            class_name = self.__class__.__name__.lower()
        except AttributeError:
            log.warning(
                "Unable to determine class name", exc_info_on_loglevel=logging.DEBUG
            )
            return True

        try:
            return self.opts["{}_returns".format(class_name)]
        except KeyError:
            # No such option, assume this isn't one we care about gating and
            # just return True.
            return True

    def low(self, fun, low, print_event=True, full_return=False):
        """
        Execute a function from low data
        Low data includes:
            required:
                - fun: the name of the function to run
            optional:
                - arg: a list of args to pass to fun
                - kwarg: kwargs for fun
                - __user__: user who is running the command
                - __jid__: jid to run under
                - __tag__: tag to run under
        """
        # fire the mminion loading (if not already done) here
        # this is not to clutter the output with the module loading
        # if we have a high debug level.
        self.mminion  # pylint: disable=W0104
        jid = low.get("__jid__", salt.utils.jid.gen_jid(self.opts))
        tag = low.get("__tag__", salt.utils.event.tagify(jid, prefix=self.tag_prefix))

        data = {
            "fun": "{}.{}".format(self.client, fun),
            "jid": jid,
            "user": low.get("__user__", "UNKNOWN"),
        }

        if print_event:
            print_func = (
                self.print_async_event if hasattr(self, "print_async_event") else None
            )
        else:
            # Suppress printing of return event (this keeps us from printing
            # runner/wheel output during orchestration).
            print_func = None

        with salt.utils.event.NamespacedEvent(
            salt.utils.event.get_event(
                "master",
                self.opts["sock_dir"],
                opts=self.opts,
                listen=False,
            ),
            tag,
            print_func=print_func,
        ) as namespaced_event:

            # TODO: test that they exist
            # TODO: Other things to inject??
            func_globals = {
                "__jid__": jid,
                "__user__": data["user"],
                "__tag__": tag,
                # weak ref to avoid the Exception in interpreter
                # teardown of event
                "__jid_event__": weakref.proxy(namespaced_event),
            }

            try:
                self_functions = copy.copy(self.functions)
                salt.utils.lazy.verify_fun(self_functions, fun)

                # Inject some useful globals to *all* the function's global
                # namespace only once per module-- not per func
                completed_funcs = []

                for mod_name in self_functions.keys():
                    if "." not in mod_name:
                        continue
                    mod, _ = mod_name.split(".", 1)
                    if mod in completed_funcs:
                        continue
                    completed_funcs.append(mod)
                    for global_key, value in func_globals.items():
                        self.functions[mod_name].__globals__[global_key] = value

                # There are some discrepancies of what a "low" structure is in the
                # publisher world it is a dict including stuff such as jid, fun,
                # arg (a list of args, with kwargs packed in). Historically this
                # particular one has had no "arg" and just has had all the kwargs
                # packed into the top level object. The plan is to move away from
                # that since the caller knows what is an arg vs a kwarg, but while
                # we make the transition we will load "kwargs" using format_call if
                # there are no kwargs in the low object passed in.

                if "arg" in low and "kwarg" in low:
                    args = low["arg"]
                    kwargs = low["kwarg"]
                else:
                    f_call = salt.utils.args.format_call(
                        self.functions[fun],
                        low,
                        expected_extra_kws=CLIENT_INTERNAL_KEYWORDS,
                    )
                    args = f_call.get("args", ())
                    kwargs = f_call.get("kwargs", {})

                # Update the event data with loaded args and kwargs
                data["fun_args"] = list(args) + ([kwargs] if kwargs else [])
                func_globals["__jid_event__"].fire_event(data, "new")

                # Initialize a context for executing the method.
                with salt.ext.tornado.stack_context.StackContext(
                    self.functions.context_dict.clone
                ):
                    func = self.functions[fun]
                    try:
                        data["return"] = func(*args, **kwargs)
                    except TypeError as exc:
                        data[
                            "return"
                        ] = "\nPassed invalid arguments: {}\n\nUsage:\n{}".format(
                            exc, func.__doc__
                        )
                    try:
                        data["success"] = self.context.get("retcode", 0) == 0
                    except AttributeError:
                        # Assume a True result if no context attribute
                        data["success"] = True
                    if isinstance(data["return"], dict) and "data" in data["return"]:
                        # some functions can return boolean values
                        data["success"] = salt.utils.state.check_result(
                            data["return"]["data"]
                        )
            except (Exception, SystemExit) as ex:  # pylint: disable=broad-except
                if isinstance(ex, salt.exceptions.NotImplemented):
                    data["return"] = str(ex)
                else:
                    data["return"] = "Exception occurred in {} {}: {}".format(
                        self.client,
                        fun,
                        traceback.format_exc(),
                    )
                data["success"] = False

            if self.store_job:
                try:
                    salt.utils.job.store_job(
                        self.opts,
                        {
                            "id": self.opts["id"],
                            "tgt": self.opts["id"],
                            "jid": data["jid"],
                            "return": data,
                        },
                        event=None,
                        mminion=self.mminion,
                    )
                except salt.exceptions.SaltCacheError:
                    log.error(
                        "Could not store job cache info. "
                        "Job details for this run may be unavailable."
                    )

            # Outputters _can_ mutate data so write to the job cache first!
            namespaced_event.fire_event(data, "ret")

            # if we fired an event, make sure to delete the event object.
            # This will ensure that we call destroy, which will do the 0MQ linger
            log.info("Runner completed: %s", data["jid"])
            return data if full_return else data["return"]

    def get_docs(self, arg=None):
        """
        Return a dictionary of functions and the inline documentation for each
        """
        if arg:
            if "*" in arg:
                target_mod = arg
                _use_fnmatch = True
            else:
                target_mod = arg + "." if not arg.endswith(".") else arg
                _use_fnmatch = False
            if _use_fnmatch:
                docs = [
                    (fun, self.functions[fun].__doc__)
                    for fun in fnmatch.filter(self.functions, target_mod)
                ]
            else:
                docs = [
                    (fun, self.functions[fun].__doc__)
                    for fun in sorted(self.functions)
                    if fun == arg or fun.startswith(target_mod)
                ]
        else:
            docs = [
                (fun, self.functions[fun].__doc__) for fun in sorted(self.functions)
            ]
        docs = dict(docs)
        return salt.utils.doc.strip_rst(docs)


class AsyncClientMixin(ClientStateMixin):
    """
    A mixin for *Client interfaces to enable easy asynchronous function execution
    """

    client = None
    tag_prefix = None

    @classmethod
    def _proc_function_remote(
        cls, *, instance, opts, fun, low, user, tag, jid, daemonize=True
    ):
        """
        Run this method in a multiprocess target to execute the function on the
        master and fire the return data on the event bus
        """
        if daemonize and not salt.utils.platform.spawning_platform():
            # Shutdown logging before daemonizing
            salt._logging.shutdown_logging()
            salt.utils.process.daemonize()
            # Because we have daemonized, salt._logging.in_mainprocess() will
            # return False. We'll just force it to return True for this
            # particular case so that proper logging can be set up.
            salt._logging.in_mainprocess.__pid__ = os.getpid()
            # Configure logging once daemonized
            salt._logging.setup_logging()

        # pack a few things into low
        low["__jid__"] = jid
        low["__user__"] = user
        low["__tag__"] = tag

        if instance is None:
            instance = cls(opts)

        try:
            return instance.cmd_sync(low)
        except salt.exceptions.EauthAuthenticationError as exc:
            log.error(exc)

    @classmethod
    def _proc_function(
        cls, *, instance, opts, fun, low, user, tag, jid, daemonize=True
    ):
        """
        Run this method in a multiprocess target to execute the function
        locally and fire the return data on the event bus
        """
        if daemonize and not salt.utils.platform.spawning_platform():
            # Shutdown logging before daemonizing
            salt._logging.shutdown_logging()
            salt.utils.process.daemonize()
            # Because we have daemonized, salt._logging.in_mainprocess() will
            # return False. We'll just force it to return True for this
            # particular case so that proper logging can be set up.
            salt._logging.in_mainprocess.__pid__ = os.getpid()
            # Configure logging once daemonized
            salt._logging.setup_logging()

        if instance is None:
            instance = cls(opts)

        # pack a few things into low
        low["__jid__"] = jid
        low["__user__"] = user
        low["__tag__"] = tag

        return instance.low(fun, low)

    def cmd_async(self, low):
        """
        Execute a function asynchronously; eauth is respected

        This function requires that :conf_master:`external_auth` is configured
        and the user is authorized

        .. code-block:: python

            >>> wheel.cmd_async({
                'fun': 'key.finger',
                'match': 'jerry',
                'eauth': 'auto',
                'username': 'saltdev',
                'password': 'saltdev',
            })
            {'jid': '20131219224744416681', 'tag': 'salt/wheel/20131219224744416681'}
        """
        return self.master_call(**low)

    def _gen_async_pub(self, jid=None):
        if jid is None:
            jid = salt.utils.jid.gen_jid(self.opts)
        tag = salt.utils.event.tagify(jid, prefix=self.tag_prefix)
        return {"tag": tag, "jid": jid}

    def asynchronous(self, fun, low, user="UNKNOWN", pub=None, local=True):
        """
        Execute the function in a multiprocess and return the event tag to use
        to watch for the return
        """
        if local:
            proc_func = self._proc_function
        else:
            proc_func = self._proc_function_remote
        async_pub = pub if pub is not None else self._gen_async_pub()
        if salt.utils.platform.spawning_platform():
            instance = None
        else:
            instance = self
        with salt.utils.process.default_signals(signal.SIGINT, signal.SIGTERM):
            proc = salt.utils.process.SignalHandlingProcess(
                target=proc_func,
                name="ProcessFunc({}, fun={} jid={})".format(
                    proc_func.__qualname__, fun, async_pub["jid"]
                ),
                kwargs=dict(
                    instance=instance,
                    opts=self.opts,
                    fun=fun,
                    low=low,
                    user=user,
                    tag=async_pub["tag"],
                    jid=async_pub["jid"],
                ),
            )
            proc.start()
        proc.join()  # MUST join, otherwise we leave zombies all over
        return async_pub

    def print_async_event(self, suffix, event):
        """
        Print all of the events with the prefix 'tag'
        """
        if not isinstance(event, dict):
            return

        # if we are "quiet", don't print
        if self.opts.get("quiet", False):
            return

        # some suffixes we don't want to print
        if suffix in ("new",):
            return

        try:
            outputter = self.opts.get(
                "output",
                event.get("outputter", None) or event.get("return").get("outputter"),
            )
        except AttributeError:
            outputter = None

        # if this is a ret, we have our own set of rules
        if suffix == "ret":
            # Check if outputter was passed in the return data. If this is the case,
            # then the return data will be a dict two keys: 'data' and 'outputter'
            if isinstance(event.get("return"), dict) and set(event["return"]) == {
                "data",
                "outputter",
            }:
                event_data = event["return"]["data"]
                outputter = event["return"]["outputter"]
            else:
                event_data = event["return"]
        else:
            event_data = {"suffix": suffix, "event": event}

        salt.output.display_output(event_data, outputter, self.opts)
