HFCNotificator/cog_notificator.py

import asyncio
import datetime
import re
import sys

import requests

import discord
from discord.ext import commands, tasks
from discord import app_commands

import db_access
import errlogging
from db_access import *
from markdown import md

load_dotenv()
AUTHOR_ID = int(os.getenv('AUTHOR_ID'))

# 2023-10-26 I have decided to start documenting the project.


class AlertReqs:
    """
    A class that handles all requests from HFC's website
    """

    def __init__(self):
        self.session = requests.Session()
        self.session.verify = True

    def request_alert_json(self) -> dict | None:
        """
        Request a json of the current running alert
        :return: JSON object as Python dict, or None if there's no alert running
        :raises requests.exceptions.Timeout: If request times out (5 seconds)
        """
        req = self.session.get('https://www.oref.org.il/WarningMessages/alert/alerts.json', headers={
            'Referer': 'https://www.oref.org.il/',
            'X-Requested-With': 'XMLHttpRequest',
            'Connection': 'keep-alive',
            'Client': 'HFC Notificator bot for Discord',
            'Nonexistent-Header': 'Yes'
        }, timeout=5)

        decoded = req.content.decode('utf-8-sig')

        if decoded is None or len(decoded) < 3:  # Why does it get a '\r\n' wtf
            ret_dict = {}
        else:
            try:
                ret_dict = json.loads(decoded)
            except (json.decoder.JSONDecodeError, json.JSONDecodeError):
                ret_dict = None

        return ret_dict

    def request_history_json(self) -> dict | None:
        """
        Request a json of the alert history from last day
        :return: JSON object as Python dict
        :raises requests.exceptions.Timeout: If request times out (5 seconds)
        """
        req = self.session.get('https://www.oref.org.il/WarningMessages/History/AlertsHistory.json', timeout=5)

        content = req.text

        try:
            ret_dict = json.loads(content)
        except (json.JSONDecodeError, json.decoder.JSONDecodeError):
            ret_dict = None
        return ret_dict


class Alert:
    """
    Represents an HFC Alert
    """
    def __init__(self, id: int, cat: int, title: str, districts: list[str], desc: str):
        """
        Init an Alert instance
        :param id: Alert ID
        :param cat: Alert category
        :param title: Alert title
        :param districts: districts the alert is running for
        :param desc: Alert description/extra info
        """
        self.id = id
        self.category = cat
        self.title = title
        self.districts = districts
        self.description = desc

    @classmethod
    def from_dict(cls, data: dict):
        """
        Return a new Alert instance from an Alert-formatted dict (matching HFC alert requests)

        Dict format:

        {
            "id": int,
            "cat": int,
            "title": str,
            "data": list[str],
            "desc": str
        }

        :param data: A dict of matching format

        :return: The new Alert instance
        """
        return cls(int(data.get('id', '0')),
                   int(data.get('cat', '0')),
                   data.get('title'),
                   data.get('data'),
                   data.get('desc'))


class AlertEmbed:
    """
    A class representing an AlertEmbed

    :var embed: discord.Embed ready for sending
    :var alert: Alert containing alert data
    :var district: db_access.AreaDistrict | str containing district data
    """

    def __init__(self, alert: Alert | dict,  district: db_access.AreaDistrict | str):
        """
        Initiating the AlertEmbed class directly is equivalent to AlertEmbed.generic_alert, but is not recommended.

        Please use AlertEmbed.generic_alert instead.

        :var embed: discord.Embed ready for sending
        :var alert: Alert containing alert data
        :var district: db_access.AreaDistrict | str containing district data
        """
        self.embed = discord.Embed(color=discord.Color.from_str('#FF0000'))
        self.district = district
        if isinstance(alert, dict):
            self.alert = Alert.from_dict(alert)
        else:
            self.alert = alert

        if isinstance(self.district, AreaDistrict):
            self.embed.title = f'התראה ב{self.district.name}'
            self.embed.add_field(name=self.alert.title, value=f'איזור {self.district.area.name}')

        else:
            self.embed.title = f'התראה ב{self.district}'
            self.embed.add_field(name=self.alert.title, value='')

        self.embed.add_field(name='נכון ל', value=datetime.datetime.now().strftime("%H:%M:%S\n%d/%m/%Y"), inline=False)
        self.embed.add_field(name='מידע נוסף', value=self.alert.description)

    @classmethod
    def generic_alert(cls, alert: Alert | dict, district: db_access.AreaDistrict | str):
        """
        Returns a new Generic AlertEmbed
        :param alert: Alert object
        :param district: AreaDistrict object (District containing Area, check db_access.AreaDistrict)
        :return: New AlertEmbed instance
        """
        ret_alem = cls(alert, district)
        return ret_alem

    @classmethod
    def missile_alert(cls, alert: Alert | dict, district: db_access.AreaDistrict | str):
        """
        Returns a new Missile AlertEmbed

        Similar to Generic AlertEmbed, but contains Migun Time

        :param alert: Alert object
        :param district: AreaDistrict object (District containing Area, check db_access.AreaDistrict)
        :return: New AlertEmbed instance
        """
        ret_alem = cls.generic_alert(alert, district)

        if (not isinstance(district, str)) and (district.migun_time is not None):
            ret_alem.embed.insert_field_at(index=1, name='זמן מיגון', value=f'{district.migun_time} שניות', inline=False)
            return ret_alem

        ret_alem.embed.insert_field_at(index=1, name='זמן מיגון', value='שגיאה באחזרת המידע', inline=False)
        return ret_alem

    @classmethod
    def auto_alert(cls, alert: Alert | dict, district: db_access.AreaDistrict | str):
        """
        Tired of having to CHOOSE an alert type all the time? Well this is JUST for you!

        Introducing... auto_alert! Just init it like any other alert, and it will return the fitting alert right then and there*!

        *"then and there" does not include any computer, end-user, developer, or any other type of tomfoolery.

        (Hopefully now I'll never have to write documentation again >:) )

        :param alert: Alert object or alert dict.
        :param district: District object (from db_access)
        :return: AlertEmbed object
        """
        if isinstance(alert, dict):
            alert_obj = Alert.from_dict(alert)
        else:
            alert_obj = alert

        match alert_obj.category:
            case 1:
                return cls.missile_alert(alert_obj, district)
            case _:
                return cls.generic_alert(alert_obj, district)


# noinspection PyUnresolvedReferences
class Notificator(commands.Cog):
    """
    Oh god.
    """
    location_group = app_commands.Group(name='locations',
                                        description='Commands related adding, removing, or setting locations.')
    districts: list[dict] = json.loads(requests.get('https://www.oref.org.il//Shared/Ajax/GetDistricts.aspx').text)

    def __init__(self, bot: commands.Bot, handler: logging.Handler):
        """
        Create the Cog
        :param bot: Discord commands bot client
        :param handler: Logging handler
        """
        self.bot = bot

        self.log = logging.Logger('Notificator')
        self.log.addHandler(handler)

        self.db = DBAccess()

        self.active_districts = []
        self.reset_district_checker = 0
        self.alert_reqs = AlertReqs()

        if not self.check_for_updates.is_running():
            self.check_for_updates.start()

    @staticmethod
    async def setup(bot: commands.Bot, handler: logging.Handler):
        """
        Set up the cog
        :param bot: commands.Bot client
        :param handler: logging handler
        :return: the cog instance that was created and added to the bot
        """

        notf = Notificator(bot, handler)
        if bot.get_cog('Notificator') is None:
            await bot.add_cog(notf)
        return notf

    @commands.Cog.listener()
    async def on_ready(self):
        """
        Start API update task when ready
        """
        if self.check_for_updates.is_running():
            return
        self.check_for_updates.start()

    def in_registered_channel(self, intr: discord.Interaction) -> bool | None:
        """
        an info about current channel
        :param intr: Command interaction from discord
        :return: Boolean:
        True - is a registered server channel, False - is a registered DM, None - was not found (may not be registered)
        """

        # OPTIONS:
        # Channel ID not None + DB not None: IS Channel and IS Registered => matching output and end
        # Channel ID not None + DB None: IS Channel and NOT Registered => matching output and end
        # Channel ID None cases:
        #   User ID not None + DB not None: IS DM and IS Registered
        #   User ID not None + DB None: IS DM and NOT Registered
        #
        # Off I go to make a utility function!

        # 17:42 update: Turns out I am very dumb and if the channel is not registered I don't return None but rather keep going
        # Thanks yrrad8! (/srs)

        if self.db.is_registered_channel(intr.channel_id):
            return True

        if self.db.is_registered_channel(intr.user.id):
            return False

        return None

    def get_matching_channel(self, intr: discord.Interaction) -> db_access.Channel:
        """
        Gets the matching Channel ID for Server Channel or DM. Returns None if UNREGISTERED or not found
        :param intr: Command interaction from discord
        :return:  registered channel ID
        """

        channel = self.db.get_channel(intr.channel_id)
        if channel is None:
            channel = self.db.get_channel(intr.user.id)
        return channel

    @staticmethod
    async def has_permission(intr: discord.Interaction) -> bool:
        """
        Check if current user have an admin permissions
        :param intr: Command interaction from discord
        :return: Boolean: Have a permissions
        """
        if intr.guild is not None and not intr.user.guild_permissions.manage_channels:
            return False
        return True

    @tasks.loop(seconds=1)
    async def check_for_updates(self):
        """
        API Updating loop, contacts the API every second to get the latest info
        """
        try:
            # Request the data
            current_alert: dict = self.alert_reqs.request_alert_json()
        except requests.exceptions.Timeout as error:
            self.log.error(f'Request timed out: {error}')
            return
        self.log.debug(f'Alert response: {current_alert}')

        if current_alert is None or len(current_alert) == 0:
            # Alert is empty

            if current_alert is None:
                # None - an error while retrieving alert
                self.log.warning('Error while current alert data.')

            # from here, len(current_alert) == 0
            # current_alert is an empty dict.

            if len(self.active_districts) == 0:
                # Alert is empty and there are no active districts
                return

            # Check if we should reset active districts. 3 empty alerts in a row will trigger a reset
            self.reset_district_checker += 1
            if self.reset_district_checker == 3:
                print('reset')
                self.active_districts = []
                self.reset_district_checker = 0
            return

        # data = active districts
        data: list[str] = current_alert["data"]

        new_districts: list[str] = []

        for district in data:
            # Get all new_districts

            if district in self.active_districts:
                continue

            new_districts.append(district)

        if len(new_districts) == 0:
            # There are no new districts.
            return

        try:
            await self.send_new_alert(current_alert, new_districts)
        except Exception as e:
            self.log.error(f'Could not send message!\nError info: {e.__str__()}')

        self.active_districts = data
        self.reset_district_checker = 0

    @check_for_updates.after_loop
    async def after_update_loop(self):
        # Attempt to force stupid "Unread Result" down its own throat
        # and just reset the connection.
        # I'm not dealing with Unread Results
        self.db.connection.close()
        self.db = DBAccess()
        if not self.check_for_updates.is_running():
            self.check_for_updates.start()

    @check_for_updates.error
    async def update_loop_error(self, err):
        errlogging.new_errlog(sys.exc_info()[1])
        await self.after_update_loop()

    @staticmethod
    def hfc_button_view() -> discord.ui.View:
        """
        Get a discord UI View containing a button with a link to the HFC Website
        :returns: discord.ui.View containing a discord.ui.Button() with link to HFC website
        """
        button = discord.ui.Button(
            style=discord.ButtonStyle.link,
            label='אתר פיקוד העורף',
            url='https://www.oref.org.il'
        )
        view = discord.ui.View()
        view.add_item(button)
        return view

    @errlogging.async_errlog
    async def send_new_alert(self, alert_data: dict, new_districts: list[str]):
        """
        Push an alert to all registered channels
        :param alert_data: Alert data dict (see test_alert for format)
        :param new_districts: Currently active districts (districts that were not already active)
        :return:
        """

        self.log.info(f'Sending alerts to channels')

        embed_ls: list[AlertEmbed] = []

        for district in new_districts:
            district_data = self.db.get_district_by_name(district)

            if district_data is not None:
                embed_ls.append(AlertEmbed.auto_alert(alert_data, AreaDistrict.from_district(district_data, self.db.get_area(district_data.area_id))))
            else:
                embed_ls.append(AlertEmbed.auto_alert(alert_data, district))

        asyncio.create_task(self.send_alerts_to_channels(embed_ls))

    @errlogging.async_errlog
    async def send_alerts_to_channels(self, embed_ls):
        """
        Send the embeds in embed_ls to all channels
        :param embed_ls: List of AlertEmbeds to send to channels
        """

        raise Exception('sdgh')

        for channel_tup in self.db.get_all_channels():
            channel = Channel.from_tuple(channel_tup)
            if channel.server_id is not None:
                dc_ch = self.bot.get_channel(channel.id)
            else:
                dc_ch = self.bot.get_user(channel.id)

            for emb in embed_ls:
                # Skipping conditions
                if dc_ch is None:
                    # Channel could not be found
                    continue
                if len(channel.locations) != 0:
                    # Channel has specific locations registered
                    if isinstance(emb.district, AreaDistrict) and (emb.district.district_id not in channel.locations):
                        # District is registered but isn't in channel's registered location list
                        continue
                    if isinstance(emb.district, str):
                        # District is not registered.
                        continue

                try:
                    await dc_ch.send(embed=emb.embed, view=self.hfc_button_view())
                    await asyncio.sleep(0.02)
                except Exception as e:
                    self.log.warning(f'Failed to send alert in channel id={channel.district_id}:\n'
                                     f'{e}')

    @app_commands.command(name='register',
                          description='Register a channel to receive HFC alerts (Requires Manage Channels)')
    async def register_channel(self, intr: discord.Interaction):

        if not await Notificator.has_permission(intr):
            await intr.response.send_message('Error: You are missing the Manage Channels permission.')
            return

        if intr.guild is not None:
            channel_id = intr.channel_id
            server_id = intr.guild.id
        else:
            channel_id = intr.user.id
            server_id = None

        await self.attempt_registration(intr, channel_id, server_id)

    async def attempt_registration(self, intr, channel_id, server_id):
        if self.db.get_channel(channel_id) is not None:
            try:
                await intr.response.send_message(f'Channel #{intr.channel.name} is already receiving HFC alerts.')
            except AttributeError:
                await intr.response.send_message(f'This channel is already receiving HFC alerts.')
            return

        if server_id is not None and self.db.get_server(server_id) is None:
            self.db.add_server(server_id, 'he')

        self.db.add_channel(channel_id, server_id, 'he')
        try:
            await intr.response.send_message(f'Channel #{intr.channel.name} will now receive HFC alerts.')
        except AttributeError:
            await intr.response.send_message(f'This channel will now receive HFC alerts.')

        ch = self.bot.get_channel(channel_id)

        try:
            perms = ch.overwrites_for(self.bot.user)
            perms.update(send_messages=True)
            await ch.set_permissions(target=ch.guild.me, overwrite=perms,
                                     reason='Update perms to allow bot to send messages in channel.')
        except discord.errors.Forbidden as e:
            await intr.followup.send(
                f'Could not allow bot to send messages to this channel! Please add the bot to this channel and allow it to send messages.\n'
                f'Error info: {e.__str__()}')
        except AttributeError:
            pass

    @app_commands.command(name='unregister',
                          description='Stop a channel from receiving HFC alerts (Requires Manage Channels)')
    async def unregister_channel(self, intr: discord.Interaction, confirmation: str = None):

        if not await Notificator.has_permission(intr):
            await intr.response.send_message('Error: You are missing the Manage Channels permission.')
            return

        channel = self.get_matching_channel(intr)

        if channel is None:
            try:
                await intr.response.send_message(f'Channel #{intr.channel.name} is not yet receiving HFC alerts')
            except AttributeError:
                await intr.response.send_message(f'This channel is not yet receiving HFC alerts')
            return

        conf_str = intr.user.name

        if confirmation is None:
            await intr.response.send_message(
                f'Are you sure you want to unregister the channel?\nThis action will also clear all related data.\n{md.b("Warning:")} this action cannot be reversed!\nPlease type your username ("{conf_str}") in the confirmation argument to confirm.')
            return
        if confirmation != conf_str:
            await intr.response.send_message(f'Invalid confirmation string!')
            return

        await self.attempt_unregistration(intr, channel)

    async def attempt_unregistration(self, intr, channel: db_access.Channel):

        self.db.remove_channel(channel.id)

        try:
            await intr.response.send_message(f'Channel #{intr.channel.name} will no longer receive HFC alerts')
        except AttributeError:
            await intr.response.send_message(f'This channel will no longer receive HFC alerts')

    @app_commands.command(name='latest',
                          description='Get all alerts up to a certain time back (may be slightly outdated)')
    @app_commands.describe(time='Amount of time back',
                           unit="The unit of time, can be 'h' (hors), 'm' (minutes), or 's' (seconds)",
                           page='Results page')
    async def latest_alerts(self, intr: discord.Interaction, time: int, unit: str, page: int = 1):
        """
        Get all alerts up to a certain time back (this may be slightly outdated)
        :param intr: command
        :param time: Amount of time back
        :param unit: The unit of time, can be 'h' (hors), 'm' (minutes), or 's' (seconds)
        :param page: Results page
        :return:
        """
        units = ['h', 'hours', 'm', 'minutes', 's', 'seconds']
        if unit not in units:
            await intr.response.send_message(f'Invalid time unit, please use one of the following:\n'
                                             f'{", ".join(units)}')
            return
        time_s = time
        if unit in ['h', 'hours']:
            time_s *= 3600
        elif unit in ['m', 'minutes']:
            time_s *= 60

        if time_s > 86400:
            await intr.response.send_message('You can currently only view history up to 1 day back.\n'
                                             f'Please use the {md.u(md.hl("Home Front Command Website", "https://www.oref.org.il/"))} to view alerts further back')
            return

        page_number = page - 1
        alert_count = 20

        try:
            history_page = Notificator.get_alert_history_page(time_s, page_number, alert_count)
        except requests.exceptions.Timeout:
            await intr.response.send_message('Request timed out.')
            return
        except ValueError as e:
            await intr.response.send_message(e.__str__())
            return

        if history_page == '':
            history_page = 'No results found.'

        view = self.hfc_button_view()
        await intr.response.send_message(history_page,
                                         view=view)

    @staticmethod
    def get_alert_history_page(time_back_amount: int, page_number: int, alerts_in_page: int) -> str:
        """
        max_page is EXCLUSIVE!
        :param time_back_amount: amount of time back
        :param page_number: the page number (starting at 0)
        :param alerts_in_page: The number of alerts in one page
        :return: page as str
        """

        alert_history = AlertReqs().request_history_json()

        current_time = datetime.datetime.now()
        time_back = datetime.timedelta(seconds=time_back_amount)

        alert_counter = 0

        for alert in alert_history:
            # This can be merged with the other loop to optimize performance.
            # Especially considering Python is a slow language.
            # Too bad!
            alert_date = datetime.datetime.strptime(alert["alertDate"], "%Y-%m-%d %H:%M:%S")

            if abs(current_time - alert_date) > time_back:
                break

            alert_counter += 1

        max_page = alert_counter // alerts_in_page

        if alert_counter % alerts_in_page != 0:
            max_page += 1

        if time_back_amount <= 0:
            raise ValueError("Time can't be lower than 1.")

        if max_page == 0:
            raise ValueError("No results found.")

        if page_number >= max_page:
            raise ValueError("Page number is too high.")
        if page_number < 0:
            raise ValueError("Page number is too low.")

        page_info = f'Page {page_number + 1}/{alert_counter // alerts_in_page + 1}\n\n'

        ret_str = ''

        for alert in alert_history[(page_number * alerts_in_page):((page_number + 1) * alerts_in_page)]:
            alert_date = datetime.datetime.strptime(alert["alertDate"], "%Y-%m-%d %H:%M:%S")

            if abs(current_time - alert_date) > time_back:
                break

            ret_str += f'התראה ב{md.b(alert["data"])}\n' \
                       f'{md.u(alert["title"])}\n' \
                       f'בשעה {alert["alertDate"]}\n\n'

        if ret_str == '':
            ret_str = 'No results found'
        else:
            ret_str = page_info + ret_str

        return ret_str

    @app_commands.command(name='about', description='Info about the bot')
    async def about_bot(self, intr: discord.Interaction):
        e = discord.Embed(color=discord.Color.orange())
        e.title = 'Home Front Command Notificator'
        e.description = 'A bot to send Discord messages for HFC alerts'
        e.add_field(name='Important info!',
                    value=f'This bot is {md.b("unofficial")} and is not related to the Home Front Command. Please do not rely on this alone.',
                    inline=False)
        e.add_field(name='What is this?',
                    value='This is a bot that connects to the HFC\'s servers and sends real-time notifications about alerts in Israel.',
                    inline=False)
        e.add_field(name='Setup',
                    value='Just invite the bot to a server (see Links below), and /register a channel to start receiving notifications.\n'
                          'Alternatively, you can /register a DM directly with the bot.\n'
                          'Please do note that the main instance of the bot is hosted on a private machine, so it may be a bit slow.\n'
                          'Feel free to host your own instance!',
                    inline=False)
        e.add_field(name='Can I host it?',
                    value='Yes! Everything is available in the GitHub repository.\nMore info on the project\'s README page (See Links below).',
                    inline=False)
        e.add_field(name='Links',
                    value=md.bq(f'{md.hl("GitHub", "https://github.com/GaMeNu/HFCNotificator")}\n'
                                f'{md.hl("Official Bot Invite Link", "https://discord.com/api/oauth2/authorize?client_id=1160344131067977738&permissions=0&scope=applications.commands%20bot")}\n'
                                f'{md.hl("HFC Website", "https://www.oref.org.il/")}\n'
                                f'{md.hl("Bot Profile (for DMs)", "https://discord.com/users/1160344131067977738")}\n'
                                f'{md.hl("Support Server", "https://discord.gg/K3E4a5ekNy")}'),
                    inline=True)

        e.add_field(name='Created by', value=md.bq('GaMeNu (@gamenu)\n'
                                                   'Yrrad8'),
                    inline=True)
        hfc_button = discord.ui.Button(
            style=discord.ButtonStyle.link,
            label='HFC Website',
            url='https://www.oref.org.il'
        )
        gh_button = discord.ui.Button(
            style=discord.ButtonStyle.link,
            label='GitHub Repository',
            url='https://github.com/GaMeNu/HFCNotificator'
        )
        view = discord.ui.View()
        view.add_item(hfc_button)
        view.add_item(gh_button)
        await intr.response.send_message(embed=e, view=view)

    @app_commands.command(name='send_alert', description='Send a custom alert (available to bot author only)')
    @app_commands.describe(title='Alert title',
                           desc='Alert description',
                           districts='Active alert districts',
                           cat='Alert category')
    async def test_alert(self,
                         intr: discord.Interaction,
                         title: str = 'בדיקת מערכת שליחת התראות',
                         desc: str = 'התעלמו מהתראה זו',
                         districts: str = 'בדיקה',
                         cat: int = 99):
        """
        A function to send a test alert
        :param intr: Command interaction from discord
        :param title: Title of the alert
        :param desc: Description of the alert
        :param districts: Districts of the alert
        :param cat: Category of the alert
        :return:
        """
        if intr.user.id != AUTHOR_ID:
            await intr.response.send_message('No access.')
            return
        await intr.response.send_message('Sending test alert...')

        districts_ls = [word.strip() for word in districts.split(',')]

        await self.send_new_alert({
            "id": "133413211330000000",
            "cat": str(cat),
            "title": title,
            "data": districts_ls,
            "desc": desc
        }, districts_ls)

    @staticmethod
    def locations_page(data_list: list, page: int, res_in_page: int = 50) -> str:
        """
        Page starts at 0

        max_page is EXCLUSIVE
        :param data_list: custom data list to get page info of
        :param page: District page
        :param res_in_page: Amount of districts to put in one pages
        :return:
        """

        dist_ls = data_list

        dist_len = len(dist_ls)

        if dist_len == 0:
            return 'No results found.'

        max_page = dist_len // res_in_page
        if dist_len % res_in_page != 0:
            max_page += 1

        if page >= max_page:
            raise ValueError('Page number is too high.')
        if page < 0:
            raise ValueError('Page number is too low.')

        page_content = f'Page {md.b(f"{page + 1}/{max_page}")}\n\n'

        start_i = page * res_in_page
        end_i = min(start_i + res_in_page, dist_len)
        for district in dist_ls[start_i:end_i]:
            page_content += f'{district[0]} - {district[1]}\n'

        return page_content

    @location_group.command(name='list', description='List all available locations, by IDs and names. Sorted alphabetically')
    @app_commands.describe(search='Search tokens, separated by spaces')
    async def locations_list(self, intr: discord.Interaction, search: str | None = None, page: int = 1):
        # decide the search_results
        if search is not None:
            search_results = self.db.search_districts(*re.split(r"\s+", search))
        else:
            search_results = self.db.get_all_districts()

        try:
            # Turn into a display-able page
            page = self.locations_page(sorted(search_results, key=lambda tup: tup[1]), page - 1)
        except ValueError as e:
            await intr.response.send_message(e.__str__())
            return

        if len(page) > 2000:
            await intr.response.send_message(
                'Page content exceeds character limit.\nPlease contact the bot authors with the command you\'ve tried to run.')
            return

        await intr.response.send_message(page)

    @location_group.command(name='add', description='Add a location(s) to the location list')
    @app_commands.describe(locations='A list of comma-separated Area IDs')
    async def location_add(self, intr: discord.Interaction, locations: str):

        if not await self.has_permission(intr):
            await intr.response.send_message('Error: You are missing the Manage Channels permission.')
            return

        channel = self.get_matching_channel(intr)
        if channel.id is None:
            await intr.response.send_message('Could not find this channel. Are you sure it is registered?')
            return

        locations_ls = [word.strip() for word in locations.split(',')]
        location_ids = []
        for location in locations_ls:
            try:
                location_ids.append(int(location))
            except ValueError:
                await intr.response.send_message(f'District ID {md.b(f"{location}")} is not a valid district ID.')
                return

        try:
            self.db.add_channel_districts(channel.id, location_ids)
        except ValueError as e:
            await intr.response.send_message(e.__str__())
            return

        await intr.response.send_message('Successfully added all IDs')

    @location_group.command(name='remove', description='Remove a location(s) to the location list')
    @app_commands.describe(locations='A list of comma-separated Area IDs')
    async def location_remove(self, intr: discord.Interaction, locations: str):

        if not await self.has_permission(intr):
            await intr.response.send_message('Error: You are missing the Manage Channels permission.')
            return

        channel = self.get_matching_channel(intr)
        if channel is None:
            await intr.response.send_message('Could not find this channel. Are you sure it is registered?')
            return

        locations_ls = [word.strip() for word in locations.split(',')]
        location_ids = []
        for location in locations_ls:
            try:
                location_ids.append(int(location))
            except ValueError:
                await intr.response.send_message(f'District ID {md.b(f"{location}")} is not a valid district ID.')
                return

        self.db.remove_channel_districts(channel.id, location_ids)
        await intr.response.send_message('Successfully removed all IDs')

    @location_group.command(name='clear', description='Clear all registered locations (get alerts on all locations)')
    async def location_clear(self, intr: discord.Interaction, confirmation: str = None):

        if not await self.has_permission(intr):
            await intr.response.send_message('Error: You are missing the Manage Channels permission.')
            return

        channel = self.get_matching_channel(intr)
        if channel is None:
            await intr.response.send_message('Could not find this channel. Are you sure it is registered?')
            return

        conf_str = intr.user.name

        if confirmation is None:
            await intr.response.send_message(
                f'Are you sure you want to clear all registered locations?\n{md.b("Warning:")} this action cannot be reversed!\nPlease type your username ("{conf_str}") in the confirmation argument to confirm.')
            return
        if confirmation != conf_str:
            await intr.response.send_message(f'Invalid confirmation string!')
            return

        self.db.clear_channel_districts(channel.id)
        await intr.response.send_message(
            f'Cleared all registered locations.\nChannel will now receive alerts from every location.')

    @location_group.command(name='registered', description='List all locations registered to this channel, by IDs and names. Sorted alphabetically')
    @app_commands.describe(search='Search tokens, separated by spaces')
    async def location_registered(self, intr: discord.Interaction, search: str | None = None, page: int = 1):

        channel = self.get_matching_channel(intr)
        if channel is None:
            await intr.response.send_message('Could not find this channel. Are you sure it is registered?')
            return

        if search is None:
            search_results = [dist.to_tuple() for dist in self.db.district_ids_to_districts(*self.db.get_channel_district_ids(channel.id))]
        else:
            search_results = [dist.to_tuple() for dist in self.db.search_channel_districts(channel.id, *re.split(r"\s+", search))]

        districts = sorted(search_results, key=lambda tup: tup[1])

        page = self.locations_page(districts, page - 1)

        if len(page) > 2000:
            await intr.response.send_message(
                'Page content exceeds character limit.\nPlease contact the bot authors with the command you\'ve tried to run.')
            return

        await intr.response.send_message(page)