PaiGram/core/plugin.py

import datetime
import re
from importlib import import_module
from re import Pattern
from types import MethodType
from typing import Any, Callable, Dict, List, Optional, Tuple, Type, TypeVar, Union

# noinspection PyProtectedMember
from telegram._utils.defaultvalue import DEFAULT_TRUE
# noinspection PyProtectedMember
from telegram._utils.types import DVInput, JSONDict
from telegram.ext import BaseHandler, ConversationHandler, Job
# noinspection PyProtectedMember
from telegram.ext._utils.types import JobCallback
from telegram.ext.filters import BaseFilter
from typing_extensions import ParamSpec

__all__ = [
    'Plugin', 'handler', 'conversation', 'job', 'error_handler'
]

P = ParamSpec('P')
T = TypeVar('T')
HandlerType = TypeVar('HandlerType', bound=BaseHandler)
TimeType = Union[float, datetime.timedelta, datetime.datetime, datetime.time]

_Module = import_module('telegram.ext')

_NORMAL_HANDLER_ATTR_NAME = "_handler_data"
_CONVERSATION_HANDLER_ATTR_NAME = "_conversation_data"
_JOB_ATTR_NAME = "_job_data"

_EXCLUDE_ATTRS = ['handlers', 'jobs', 'error_handlers']


class _Plugin:

    def _make_handler(self, data: Dict) -> HandlerType:
        func = getattr(self, data.pop('func'))
        return data.pop('type')(callback=func, **data.pop('kwargs'))

    @property
    def handlers(self) -> List[HandlerType]:
        result = []
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                    not (attr.startswith('_') or attr in _EXCLUDE_ATTRS)
                    and
                    isinstance(func := getattr(self, attr), MethodType)
                    and
                    (data := getattr(func, _NORMAL_HANDLER_ATTR_NAME, None))
            ):
                if data['type'] not in ['error', 'new_chat_member']:
                    result.append(self._make_handler(data))

        return result

    def _new_chat_members_handler_funcs(self) -> List[Tuple[int, Callable]]:

        result = []
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                    not (attr.startswith('_') or attr in _EXCLUDE_ATTRS)
                    and
                    isinstance(func := getattr(self, attr), MethodType)
                    and
                    (data := getattr(func, _NORMAL_HANDLER_ATTR_NAME, None))
            ):
                if data['type'] == 'new_chat_member':
                    result.append((data['priority'], func))

        return result

    @property
    def error_handlers(self) -> Dict[Callable, bool]:
        result = {}
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                    not (attr.startswith('_') or attr in _EXCLUDE_ATTRS)
                    and
                    isinstance(func := getattr(self, attr), MethodType)
                    and
                    (data := getattr(func, _NORMAL_HANDLER_ATTR_NAME, None))
            ):
                if data['type'] == 'error':
                    result.update({func: data['block']})
        return result

    @property
    def jobs(self) -> List[Job]:
        from core.bot import bot
        result = []
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                    not (attr.startswith('_') or attr in _EXCLUDE_ATTRS)
                    and
                    isinstance(func := getattr(self, attr), MethodType)
                    and
                    (data := getattr(func, _JOB_ATTR_NAME, None))
            ):
                _job = getattr(bot.job_queue, data.pop('type'))(
                    callback=func, **data.pop('kwargs'),
                    **{key: data.pop(key) for key in list(data.keys())}
                )
                result.append(_job)
        return result


class _Conversation(_Plugin):
    _conversation_kwargs: Dict

    def __init_subclass__(cls, **kwargs):
        cls._conversation_kwargs = kwargs
        super(_Conversation, cls).__init_subclass__()
        return cls

    @property
    def handlers(self) -> List[HandlerType]:
        result: List[HandlerType] = []

        entry_points: List[HandlerType] = []
        states: Dict[Any, List[HandlerType]] = {}
        fallbacks: List[HandlerType] = []
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                    not (attr.startswith('_') or attr == 'handlers')
                    and
                    isinstance(func := getattr(self, attr), Callable)
                    and
                    (handler_data := getattr(func, _NORMAL_HANDLER_ATTR_NAME, None))
            ):
                _handler = self._make_handler(handler_data)
                if conversation_data := getattr(func, _CONVERSATION_HANDLER_ATTR_NAME, None):
                    if (_type := conversation_data.pop('type')) == 'entry':
                        entry_points.append(_handler)
                    elif _type == 'state':
                        if (key := conversation_data.pop('state')) in states:
                            states[key].append(_handler)
                        else:
                            states[key] = [_handler]
                    elif _type == 'fallback':
                        fallbacks.append(_handler)
                else:
                    result.append(_handler)
        if entry_points or states or fallbacks:
            result.append(
                ConversationHandler(
                    entry_points, states, fallbacks,
                    **self.__class__._conversation_kwargs  # pylint: disable=W0212
                )
            )
        return result


class Plugin(_Plugin):
    Conversation = _Conversation


class _Handler:
    def __init__(self, **kwargs):
        self.kwargs = kwargs

    @property
    def _type(self) -> Type[BaseHandler]:
        return getattr(_Module, f"{self.__class__.__name__.strip('_')}Handler")

    def __call__(self, func: Callable[P, T]) -> Callable[P, T]:
        setattr(func, _NORMAL_HANDLER_ATTR_NAME, {'type': self._type, 'func': func.__name__, 'kwargs': self.kwargs})
        return func


class _CallbackQuery(_Handler):
    def __init__(
            self,
            pattern: Union[str, Pattern, type, Callable[[object], Optional[bool]]] = None,
            block: DVInput[bool] = DEFAULT_TRUE,
    ):
        super(_CallbackQuery, self).__init__(pattern=pattern, block=block)


class _ChatJoinRequest(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE):
        super(_ChatJoinRequest, self).__init__(block=block)


class _ChatMember(_Handler):
    def __init__(self, chat_member_types: int = -1):
        super().__init__(chat_member_types=chat_member_types)


class _ChosenInlineResult(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE, pattern: Union[str, Pattern] = None):
        super().__init__(block=block, pattern=pattern)


class _Command(_Handler):
    def __init__(self, command: str, filters: "BaseFilter" = None, block: DVInput[bool] = DEFAULT_TRUE):
        super(_Command, self).__init__(command=command, filters=filters, block=block)


class _InlineQuery(_Handler):
    def __init__(
            self,
            pattern: Union[str, Pattern] = None,
            block: DVInput[bool] = DEFAULT_TRUE,
            chat_types: List[str] = None
    ):
        super().__init__(pattern=pattern, block=block, chat_types=chat_types)


class _MessageNewChatMembers(_Handler):
    def __init__(self, func: Callable[P, T] = None, *, priority: int = 5):
        super().__init__()
        self.func = func
        self.priority = priority

    def __call__(self, func: Callable[P, T] = None) -> Callable[P, T]:
        self.func = self.func or func
        setattr(
            self.func, _NORMAL_HANDLER_ATTR_NAME,
            {'type': 'new_chat_member', 'priority': self.priority}
        )
        return self.func


class _Message(_Handler):
    def __init__(self, filters: "BaseFilter", block: DVInput[bool] = DEFAULT_TRUE, ):
        super(_Message, self).__init__(filters=filters, block=block)

    new_chat_members = _MessageNewChatMembers


class _PollAnswer(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE):
        super(_PollAnswer, self).__init__(block=block)


class _Poll(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE):
        super(_Poll, self).__init__(block=block)


class _PreCheckoutQuery(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE):
        super(_PreCheckoutQuery, self).__init__(block=block)


class _Prefix(_Handler):
    def __init__(
            self,
            prefix: str,
            command: str,
            filters: BaseFilter = None,
            block: DVInput[bool] = DEFAULT_TRUE,
    ):
        super(_Prefix, self).__init__(prefix=prefix, command=command, filters=filters, block=block)


class _ShippingQuery(_Handler):
    def __init__(self, block: DVInput[bool] = DEFAULT_TRUE):
        super(_ShippingQuery, self).__init__(block=block)


class _StringCommand(_Handler):
    def __init__(self, command: str):
        super(_StringCommand, self).__init__(command=command)


class _StringRegex(_Handler):
    def __init__(self, pattern: Union[str, Pattern], block: DVInput[bool] = DEFAULT_TRUE):
        super(_StringRegex, self).__init__(pattern=pattern, block=block)


class _Type(_Handler):
    # noinspection PyShadowingBuiltins
    def __init__(
            self,
            type: Type,  # pylint: disable=redefined-builtin
            strict: bool = False,
            block: DVInput[bool] = DEFAULT_TRUE
    ):
        super(_Type, self).__init__(type=type, strict=strict, block=block)


# noinspection PyPep8Naming
class handler(_Handler):
    def __init__(self, handler_type: Callable[P, HandlerType], **kwargs: P.kwargs):
        self._type_ = handler_type
        super(handler, self).__init__(**kwargs)

    @property
    def _type(self) -> Type[BaseHandler]:
        # noinspection PyTypeChecker
        return self._type_

    callback_query = _CallbackQuery
    chat_join_request = _ChatJoinRequest
    chat_member = _ChatMember
    chosen_inline_result = _ChosenInlineResult
    command = _Command
    inline_query = _InlineQuery
    message = _Message
    poll_answer = _PollAnswer
    pool = _Poll
    pre_checkout_query = _PreCheckoutQuery
    prefix = _Prefix
    shipping_query = _ShippingQuery
    string_command = _StringCommand
    string_regex = _StringRegex
    type = _Type


# noinspection PyPep8Naming
class error_handler:
    def __init__(self, func: Callable[P, T] = None, *, block: bool = DEFAULT_TRUE):
        self._func = func
        self._block = block

    def __call__(self, func: Callable[P, T] = None) -> Callable[P, T]:
        self._func = func or self._func
        setattr(self._func, _NORMAL_HANDLER_ATTR_NAME, {'type': 'error', 'block': self._block})
        return self._func


def _entry(func: Callable[P, T]) -> Callable[P, T]:
    setattr(func, _CONVERSATION_HANDLER_ATTR_NAME, {'type': 'entry'})
    return func


class _State:
    def __init__(self, state: Any):
        self.state = state

    def __call__(self, func: Callable[P, T] = None) -> Callable[P, T]:
        setattr(func, _CONVERSATION_HANDLER_ATTR_NAME, {'type': 'state', 'state': self.state})
        return func


def _fallback(func: Callable[P, T]) -> Callable[P, T]:
    setattr(func, _CONVERSATION_HANDLER_ATTR_NAME, {'type': 'fallback'})
    return func


# noinspection PyPep8Naming
class conversation(_Handler):
    entry_point = _entry
    state = _State
    fallback = _fallback


class _Job:
    kwargs: Dict = {}

    def __init__(
            self, name: str = None, data: object = None, chat_id: int = None,
            user_id: int = None, job_kwargs: JSONDict = None, **kwargs
    ):
        self.name = name
        self.data = data
        self.chat_id = chat_id
        self.user_id = user_id
        self.job_kwargs = {} if job_kwargs is None else job_kwargs
        self.kwargs = kwargs

    def __call__(self, func: JobCallback) -> JobCallback:
        setattr(func, _JOB_ATTR_NAME, {
            'name': self.name, 'data': self.data, 'chat_id': self.chat_id, 'user_id': self.user_id,
            'job_kwargs': self.job_kwargs, 'kwargs': self.kwargs,
            'type': re.sub(r'([A-Z])', lambda x: '_' + x.group().lower(), self.__class__.__name__).lstrip('_')
        })
        return func


class _RunOnce(_Job):
    def __init__(
            self, when: TimeType,
            data: object = None, name: str = None, chat_id: int = None, user_id: int = None, job_kwargs: JSONDict = None
    ):
        super().__init__(name, data, chat_id, user_id, job_kwargs, when=when)


class _RunRepeating(_Job):
    def __init__(
            self, interval: Union[float, datetime.timedelta], first: TimeType = None, last: TimeType = None,
            data: object = None, name: str = None, chat_id: int = None, user_id: int = None, job_kwargs: JSONDict = None
    ):
        super().__init__(name, data, chat_id, user_id, job_kwargs, interval=interval, first=first, last=last)


class _RunMonthly(_Job):
    def __init__(
            self, when: datetime.time, day: int,
            data: object = None, name: str = None, chat_id: int = None, user_id: int = None, job_kwargs: JSONDict = None
    ):
        super().__init__(name, data, chat_id, user_id, job_kwargs, when=when, day=day)


class _RunDaily(_Job):
    def __init__(
            self, time: datetime.time, days: Tuple[int, ...] = tuple(range(7)),
            data: object = None, name: str = None, chat_id: int = None, user_id: int = None, job_kwargs: JSONDict = None
    ):
        super().__init__(name, data, chat_id, user_id, job_kwargs, time=time, days=days)


class _RunCustom(_Job):
    def __init__(self, data: object = None, name: str = None, chat_id: int = None, user_id: int = None,
                 job_kwargs: JSONDict = None):
        super().__init__(name, data, chat_id, user_id, job_kwargs)


# noinspection PyPep8Naming
class job:
    run_once = _RunOnce
    run_repeating = _RunRepeating
    run_monthly = _RunMonthly
    run_daily = _RunDaily
    run_custom = _RunCustom