import datetime

import telebot
import pymongo
from functools import wraps

from community import Community
from user import User
from templates import TemplateProvider
import emoji_data_python as edp
from threading import Thread
import utils
import typing
import traceback
import time


tz = datetime.timezone(datetime.timedelta(hours=3))
POLL_HOUR = 9
SCHEDULING_HOUR = 21


def locale_from_ietf(_ietf_locale: str) -> str:
    # if not ietf_locale:
    #     return 'en'
    # ietf_locale = ietf_locale.split('-')[0]
    # return 'ru' if ietf_locale in ['ru', 'be', 'uk'] else 'en'
    return 'ru'


class Bot(telebot.TeleBot):
    def __init__(self, config: dict):
        self.name = config['name']
        super().__init__(config['token'])
        self.me: telebot.types.User = self.get_me()
        self.db = getattr(pymongo.MongoClient(config['mongo']), self.name)
        self.db.users.create_index([('user_id', pymongo.ASCENDING)], unique=True)
        self.config = config
        self.templates = TemplateProvider()
        for template_file in config.get('template_files', []):
            self.templates.load_file(template_file)
        self.main_keyboard = None

    def render_template(self, template_name: str, locale: str = 'ru', **kwargs) -> \
            typing.Tuple[str, typing.Union[telebot.types.ReplyKeyboardMarkup, telebot.types.InlineKeyboardMarkup]]:
        text: str = self.templates.render_template(template_name, locale, bot=self, **kwargs)
        text, keyboard = self.templates.separate_text_and_keyboards(text)
        keyboard = utils.create_keyboard(keyboard) \
            if keyboard is not None \
            else self.main_keyboard.get(locale, self.main_keyboard.get('ru'))
        return text, keyboard

    def render_message_for_user(self, user: User, template_name: str, **kwargs) -> \
            typing.Tuple[str, typing.Union[telebot.types.ReplyKeyboardMarkup, telebot.types.InlineKeyboardMarkup]]:
        text: str = self.templates.render_template(template_name, user.locale, user=user, **kwargs)
        text, keyboard = self.templates.separate_text_and_keyboards(text)
        keyboard = utils.create_keyboard(keyboard)
        return text, keyboard

    def edit_message_with_template(self, query: telebot.types.CallbackQuery, template: str, **kwargs):
        msg = query.message
        text, keyboard = self.render_message_for_user(self.get_user_by_msg(msg), template,
                                                      tg_user=msg.from_user,
                                                      **kwargs)
        self.edit_message_text(text, msg.chat.id, msg.id, reply_markup=keyboard, parse_mode='HTML')
        self.answer_callback_query(query)

    def reply_with_template(self, msg: typing.Union[telebot.types.Message, telebot.types.CallbackQuery], template: str,
                            as_reply: bool = False, locale_overwrite: typing.Optional[str] = None, **kwargs):
        if isinstance(msg, telebot.types.CallbackQuery):
            msg = msg.message
        user = self.get_user_by_msg(msg)
        text, keyboard = self.render_message_for_user(user, template,
                                                      tg_user=msg.from_user, locale_overwrite=locale_overwrite,
                                                      **kwargs)
        if as_reply:
            self.reply_to(msg, text, reply_markup=keyboard)
        else:
            self.send_message(msg.chat.id, text, reply_markup=keyboard, parse_mode='HTML')

    def send_template(self, user_id: int, template: str, locale_overwrite: typing.Optional[str] = None, **kwargs):
        user = User.by_id(user_id, self)
        tg_user = self.get_chat(user_id)
        text, keyboard = self.render_message_for_user(user, template,
                                                      tg_user=tg_user, locale_overwrite=locale_overwrite,
                                                      **kwargs)
        self.send_message(user_id, text, reply_markup=keyboard, parse_mode='HTML')

    def get_user_from_db(self, request: dict) -> typing.Optional[User]:
        data = self.db.users.find_one(request)
        if data is None:
            return None
        return User.from_dict(data)

    def get_community_from_db(self, request: dict, create_if_not_found: bool = False) -> typing.Optional[Community]:
        data = self.db.communities.find_one(request)
        if data is None:
            if create_if_not_found:
                self.db.communities.insert_one(request)
                return Community.from_dict(request)
            return None
        return Community.from_dict(data)

    def get_user_by_msg(self, msg: typing.Union[telebot.types.Message, telebot.types.InlineQuery]) -> User:
        tg_user: telebot.types.User = msg.from_user
        if tg_user.id == self.me.id and msg.chat.id > 0:
            user = User.by_id(msg.chat.id, self) or User.by_id(msg.from_user.id, self)
        else:
            user = User.by_id(msg.from_user.id, self)
        if user is not None:
            if tg_user.language_code:
                user.locale = locale_from_ietf(tg_user.language_code)
            return user
        else:
            user = User(msg.from_user.id, msg.from_user.id)
            user.locale = locale_from_ietf(tg_user.language_code)
            self.db.users.insert_one(user.dict())
            return user

    def save_user(self, user: User):
        self.db.users.replace_one({'user_id': user.user_id}, user.dict())

    def save_community(self, community: Community):
        self.db.communities.replace_one({'chat_id': community.chat_id}, community.dict())

    def handle_commands(self, cmds: typing.List[str]):
        cmds = [edp.replace_colons(cmd) for cmd in cmds]

        def wrapper(func):
            @wraps(func)
            def func_wrapped(msg):
                user = self.get_user_by_msg(msg)
                args: str = msg.text
                for cmd in cmds:
                    if args.startswith(cmd):
                        if len(args.split(cmd)) <= 1:
                            args = ''
                            break
                        args = cmd.join(args.split(cmd)[1:]).strip()
                        break
                try:
                    func(msg, user, args)
                except:
                    print(traceback.format_exc())

            if cmds[0].startswith('/'):
                self.message_handler(commands=[cmd[1:] for cmd in cmds])(func_wrapped)
            else:
                self.message_handler(func=lambda msg: any(msg.text.startswith(cmd) for cmd in cmds))(func_wrapped)
        return wrapper

    def handle_callback(self, name: str):
        def wrapper(func):
            @wraps(func)
            def func_wrapped(query):
                user = self.get_user_by_msg(query)
                args = query.data.strip()[len(name) + 1:]
                try:
                    return func(query, user, args.strip())
                except KeyboardInterrupt as e:
                    raise e
                except Exception:
                    print(f'An exception occured: {traceback.format_exc()}')

            self.callback_query_handler(
                lambda query: query.data.strip().startswith(name + '_') or query.data.strip() == name)(func_wrapped)
            return func_wrapped
        return wrapper

    def inline_handler_(self, filter_func, **kwargs):
        def wrapper(func):
            @wraps(func)
            def handler(*args, **kwargs_2):
                def func_2():
                    try:
                        func(*args, **kwargs_2)
                    except Exception as e:
                        print('An exception occured:', e)

                Thread(target=func_2).start()

            self.inline_handler(filter_func, **kwargs)(func)
            return handler

        return wrapper

    def iter_users(self) -> typing.Iterable[User]:
        for user_data in self.db.users.find():
            yield User.from_dict(user_data)

    def iter_communities(self) -> typing.Iterable[Community]:
        for community_data in self.db.communities.find():
            yield Community.from_dict(community_data)

    def poll_user_for_community(self, user: User, community: Community):
        try:
            def_answer = False   # community.default_answers.get(user.user_id, True)
            community.polled[user.user_id] = datetime.date.today()
            self.send_template(user.user_id, 'poll_user', community=community, answer=def_answer)
            community.pool += [user.user_id] * def_answer
        except telebot.apihelper.ApiTelegramException:
            pass

    def poll_users_in_community(self, community: Community):
        for user_id in community.users_to_poll():
            user = User.by_id(user_id, self)
            if user is None:
                continue
            self.poll_user_for_community(user, community)
        self.save_community(community)

    def run_suggestions(self):
        for user in self.iter_users():
            found_communities = False
            try:
                for community in self.iter_communities():
                    if user.check_chat(community.chat_id, self) and user.user_id not in community.members:
                        self.send_template(user.user_id, 'community_suggest', community=community)
                        found_communities = True
            except KeyboardInterrupt as e:
                raise e
            except Exception:
                print(f'An exception occured in suggestions: {traceback.format_exc()}')
            if found_communities:
                self.save_user(user)

    def send_meeting_info_in_community(self, community: Community):
        for meeting in community.scheduled_meetings:
            try:
                person_1, person_2 = self.get_chat(meeting[0]), self.get_chat(meeting[1])
                self.send_template(meeting[0], 'meeting_info', community=community, meeting=meeting, person=person_2)
                self.send_template(meeting[1], 'meeting_info', community=community, meeting=meeting, person=person_1)
            except telebot.apihelper.ApiTelegramException:
                pass
        community.archived_meetings += community.scheduled_meetings
        community.scheduled_meetings = []
        self.save_community(community)

    def run_necessary_actions_for_community(self, community: Community):
        if community.task_last_timestamps.get('poll', datetime.date.today() - datetime.timedelta(days=1)) \
                < datetime.date.today() and datetime.datetime.now(tz).hour >= POLL_HOUR:
            self.poll_users_in_community(community)
            community.task_last_timestamps['poll'] = datetime.date.today()
        if community.task_last_timestamps.get('scheduling', datetime.date.today() - datetime.timedelta(days=1)) \
                < datetime.date.today() and datetime.datetime.now(tz).hour >= SCHEDULING_HOUR:
            community.schedule_meetings()
            self.send_meeting_info_in_community(community)
            community.task_last_timestamps['scheduling'] = datetime.date.today()
        self.save_community(community)

    def actions_loop(self):
        while True:
            try:
                for community in self.iter_communities():
                    try:
                        self.run_necessary_actions_for_community(community)
                    except KeyboardInterrupt as e:
                        raise e
                    except Exception:
                        print(f'An exception occurred: {traceback.format_exc()}')
            except KeyboardInterrupt as e:
                raise e
            except Exception:
                print(f'An exception occurred while iterating through communities: {traceback.format_exc()}')
            Thread(target=self.run_suggestions).start()
            time.sleep(60)

    def register_next_step_handler(self, message, callback, *args, **kwargs):
        if isinstance(message, telebot.types.CallbackQuery):
            message = message.message

        def new_callback(new_message, *new_args, **new_kwargs):
            try:
                if new_message.text in ['🛑 Cancel', '🛑 Отменить']:
                    # self.clear_step_handler_by_chat_id(new_message.chat.id)
                    self.reply_with_template(new_message, 'canceled')
                return callback(new_message, *new_args, **new_kwargs)
            except:
                print(traceback.format_exc())

        super().register_next_step_handler(message, new_callback, *args, **kwargs)

    def send_all_copy(self, message: telebot.types.Message):
        num = 0
        failures = 0
        for user in self.iter_users():
            try:
                self.copy_message(user.user_id, message.chat.id, message.id)
                num += 1
            except:
                print(traceback.format_exc())
                failures += 1
        print(f'Sent to {num} users. Failures: {failures}')

    def user_growth(self) -> typing.List[int]:
        timestamp = next(iter(self.db.users.find({}).sort('start_timestamp')))
        data = list()
        while timestamp < time.time():
            data.append(self.db.users.find({'start_timestamp': {'$lt': timestamp}}).count_documents())
            timestamp += 24 * 3600
        return data

    def stats(self) -> typing.Dict[str, int]:
        total_users = self.db.users.count_documents({})
        new_users_today = self.db.users.count_documents(
                {'start_timestamp': {'$gt': int(time.time() - 24 * 3600)}}
                )
        new_users_month = self.db.users.count_documents(
                {'start_timestamp': {'$gt': int(time.time() - 24 * 3600 * 30)}}
                )
        active_users_today = self.db.users.count_documents(
                {'last_action_timestamp': {'$gt': int(time.time() - 24 * 3600)}}
                )
        active_users_month = self.db.users.count_documents(
                {'last_action_timestamp': {'$gt': int(time.time() - 24 * 3600 * 30)}}
                )
        return {
                'Total users': total_users,
                'New users in the last 24 hours': new_users_today,
                'New users last 30 days': new_users_month,
                'Active users in the last 24 hours': active_users_today,
                'Active users in the last 30 days': active_users_month
                }