import contextlib
import logging
from datetime import datetime, timedelta
from io import BytesIO
from os import getpid, makedirs, remove, sep
from pathlib import Path
from shutil import rmtree
from time import time
from traceback import format_exc
from typing import List, Tuple, Union

import pyrogram
from aiohttp import ClientSession
from bson import ObjectId
from dateutil.relativedelta import relativedelta
from libbot import json_read, json_write
from libbot.i18n import BotLocale
from libbot.i18n.sync import _
from photosapi_client.errors import UnexpectedStatus
from pyrogram.client import Client
from pyrogram.errors import BadRequest, bad_request_400
from pyrogram.handlers.message_handler import MessageHandler
from pyrogram.raw.all import layer
from pyrogram.types import (
    BotCommand,
    BotCommandScopeAllChatAdministrators,
    BotCommandScopeAllGroupChats,
    BotCommandScopeAllPrivateChats,
    BotCommandScopeChat,
    BotCommandScopeChatAdministrators,
    BotCommandScopeChatMember,
    BotCommandScopeDefault,
    Message,
)
from pytimeparse.timeparse import timeparse
from ujson import dumps, loads

from classes.commandset import CommandSet
from classes.exceptions import (
    SubmissionDuplicatesError,
    SubmissionUnavailableError,
    SubmissionUnsupportedError,
)
from classes.pyrocommand import PyroCommand
from modules.api_client import (
    BodyPhotoUploadAlbumsAlbumPhotosPost,
    File,
    client,
    photo_upload,
)
from modules.database import col_submitted
from modules.http_client import http_session
from modules.scheduler import scheduler
from modules.sender import send_content

logger = logging.getLogger(__name__)


class PyroClient(Client):
    def __init__(self):
        with open("config.json", "r", encoding="utf-8") as f:
            self.config: dict = loads(f.read())

        super().__init__(
            name="bot_client",
            api_id=self.config["bot"]["api_id"],
            api_hash=self.config["bot"]["api_hash"],
            bot_token=self.config["bot"]["bot_token"],
            plugins=dict(root="plugins", exclude=self.config["disabled_plugins"]),
            sleep_threshold=120,
            max_concurrent_transmissions=self.config["bot"][
                "max_concurrent_transmissions"
            ],
        )

        self.version: float = 0.2

        self.owner: int = self.config["bot"]["owner"]
        self.admins: List[int] = self.config["bot"]["admins"] + [
            self.config["bot"]["owner"]
        ]
        self.commands: List[PyroCommand] = []
        self.scoped_commands: bool = self.config["bot"]["scoped_commands"]
        self.start_time: float = 0

        self.bot_locale: BotLocale = BotLocale(Path(self.config["locations"]["locale"]))
        self.default_locale: str = self.bot_locale.default
        self.locales: dict = self.bot_locale.locales

        self._ = self.bot_locale._
        self.in_all_locales = self.bot_locale.in_all_locales
        self.in_every_locale = self.bot_locale.in_every_locale

        self.sender_session = ClientSession()

    async def start(self):
        await super().start()

        self.start_time = time()

        logger.info(
            "Bot is running with Pyrogram v%s (Layer %s) and has started as @%s on PID %s.",
            pyrogram.__version__,
            layer,
            self.me.username,
            getpid(),
        )

        try:
            if Path(f"{self.config['locations']['cache']}/shutdown_time").exists():
                downtime = relativedelta(
                    datetime.now(),
                    datetime.fromtimestamp(
                        (
                            await json_read(
                                Path(
                                    f"{self.config['locations']['cache']}/shutdown_time"
                                )
                            )
                        )["timestamp"]
                    ),
                )

                if downtime.days >= 1:
                    startup_message = self._(
                        "startup_downtime_days",
                        "message",
                    ).format(getpid(), downtime.days)
                elif downtime.hours >= 1:
                    startup_message = self._(
                        "startup_downtime_hours",
                        "message",
                    ).format(getpid(), downtime.hours)
                else:
                    startup_message = self._(
                        "startup_downtime_minutes",
                        "message",
                    ).format(getpid(), downtime.minutes)
            else:
                startup_message = (self._("startup", "message").format(getpid()),)

            await self.send_message(
                chat_id=self.config["reports"]["chat_id"],
                text=startup_message,
            )

            if self.config["reports"]["update"]:
                try:
                    async with ClientSession(
                        json_serialize=dumps,
                    ) as http_session:
                        check_update = await http_session.get(
                            "https://git.end-play.xyz/api/v1/repos/profitroll/TelegramPoster/releases?page=1&limit=1"
                        )

                    response = await check_update.json()

                    if len(response) == 0:
                        raise ValueError("No bot releases on git found.")

                    if float(response[0]["tag_name"].replace("v", "")) > self.version:
                        logger.info(
                            "New version %s found (current %s)",
                            response[0]["tag_name"].replace("v", ""),
                            self.version,
                        )
                        await self.send_message(
                            self.owner,
                            self._(
                                "update_available",
                                "message",
                            ).format(
                                response[0]["tag_name"],
                                response[0]["html_url"],
                                response[0]["body"],
                            ),
                        )
                    else:
                        logger.info("No updates found, bot is up to date.")
                except bad_request_400.PeerIdInvalid:
                    logger.warning(
                        "Could not send startup message to bot owner. Perhaps user has not started the bot yet."
                    )
                except Exception as exp:
                    logger.exception(
                        "Update check failed due to %s: %s", exp, format_exc()
                    )

            scheduler.add_job(
                self.register_commands,
                trigger="date",
                run_date=datetime.now() + timedelta(seconds=5),
                kwargs={"command_sets": await self.collect_commands()},
            )

            if self.config["mode"]["post"]:
                if self.config["posting"]["use_interval"]:
                    scheduler.add_job(
                        send_content,
                        "interval",
                        seconds=timeparse(self.config["posting"]["interval"]),
                        args=[self, self.sender_session],
                    )
                else:
                    for entry in self.config["posting"]["time"]:
                        dt_obj = datetime.strptime(entry, "%H:%M")
                        scheduler.add_job(
                            send_content,
                            "cron",
                            hour=dt_obj.hour,
                            minute=dt_obj.minute,
                            args=[self, self.sender_session],
                        )

            scheduler.start()
        except BadRequest:
            logger.warning("Unable to send message to report chat.")

    async def stop(self):
        makedirs(self.config["locations"]["cache"], exist_ok=True)
        await json_write(
            {"timestamp": time()},
            Path(f"{self.config['locations']['cache']}/shutdown_time"),
        )

        try:
            await self.send_message(
                chat_id=self.config["reports"]["chat_id"],
                text=f"Bot stopped with PID `{getpid()}`",
            )
        except BadRequest:
            logger.warning("Unable to send message to report chat.")
        await http_session.close()
        await self.sender_session.close()
        await super().stop()
        logger.warning("Bot stopped with PID %s.", getpid())

    async def collect_commands(self) -> Union[List[CommandSet], None]:
        """Gather list of the bot's commands

        ### Returns:
            * `List[CommandSet]`: List of the commands' sets
        """
        command_sets = None

        # If config get bot.scoped_commands is true - more complicated
        # scopes system will be used instead of simple global commands
        if self.scoped_commands:
            scopes = {}
            command_sets = []

            # Iterate through all commands in config
            for command, contents in self.config["commands"].items():
                # Iterate through all scopes of a command
                for scope in contents["scopes"]:
                    if dumps(scope) not in scopes:
                        scopes[dumps(scope)] = {"_": []}

                    # Add command to the scope's flattened key in scopes dict
                    scopes[dumps(scope)]["_"].append(
                        BotCommand(command, _(command, "commands"))
                    )

                    for locale, string in (
                        self.in_every_locale(command, "commands")
                    ).items():
                        if locale not in scopes[dumps(scope)]:
                            scopes[dumps(scope)][locale] = []

                        scopes[dumps(scope)][locale].append(BotCommand(command, string))

            # Iterate through all scopes and its commands
            for scope, locales in scopes.items():
                # Make flat key a dict again
                scope_dict = loads(scope)

                # Replace "owner" in the bot scope with owner's id
                if "chat_id" in scope_dict and scope_dict["chat_id"] == "owner":
                    scope_dict["chat_id"] = self.owner

                # Create object with the same name and args from the dict
                try:
                    scope_obj = globals()[scope_dict["name"]](
                        **{
                            key: value
                            for key, value in scope_dict.items()
                            if key != "name"
                        }
                    )
                except NameError:
                    logger.error(
                        "Could not register commands of the scope '%s' due to an invalid scope class provided!",
                        scope_dict["name"],
                    )
                    continue
                except TypeError:
                    logger.error(
                        "Could not register commands of the scope '%s' due to an invalid class arguments provided!",
                        scope_dict["name"],
                    )
                    continue

                # Add set of commands to the list of the command sets
                for locale, commands in locales.items():
                    if locale == "_":
                        command_sets.append(
                            CommandSet(commands, scope=scope_obj, language_code="")
                        )
                        continue
                    command_sets.append(
                        CommandSet(commands, scope=scope_obj, language_code=locale)
                    )

            logger.info("Registering the following command sets: %s", command_sets)

        else:
            # This part here looks into the handlers and looks for commands
            # in it, if there are any. Then adds them to self.commands
            for handler in self.dispatcher.groups[0]:
                if isinstance(handler, MessageHandler):
                    for entry in [handler.filters.base, handler.filters.other]:
                        if hasattr(entry, "commands"):
                            for command in entry.commands:
                                logger.info("I see a command %s in my filters", command)
                                self.add_command(command)

        return command_sets

    def add_command(
        self,
        command: str,
    ):
        """Add command to the bot's internal commands list

        ### Args:
            * command (`str`)
        """
        self.commands.append(
            PyroCommand(
                command,
                _(command, "commands"),
            )
        )
        logger.info(
            "Added command '%s' to the bot's internal commands list",
            command,
        )

    async def register_commands(
        self, command_sets: Union[List[CommandSet], None] = None
    ):
        """Register commands stored in bot's 'commands' attribute"""

        if command_sets is None:
            commands = [
                BotCommand(command=command.command, description=command.description)
                for command in self.commands
            ]

            logger.info(
                "Registering commands %s with a default scope 'BotCommandScopeDefault'"
            )

            await self.set_bot_commands(commands)
            return

        for command_set in command_sets:
            logger.info(
                "Registering command set with commands %s and scope '%s' (%s)",
                command_set.commands,
                command_set.scope,
                command_set.language_code,
            )
            await self.set_bot_commands(
                command_set.commands,
                command_set.scope,
                language_code=command_set.language_code,
            )

    async def remove_commands(self, command_sets: Union[List[CommandSet], None] = None):
        """Remove commands stored in bot's 'commands' attribute"""

        if command_sets is None:
            logger.info(
                "Removing commands with a default scope 'BotCommandScopeDefault'"
            )
            await self.delete_bot_commands(BotCommandScopeDefault())
            return

        for command_set in command_sets:
            logger.info(
                "Removing command set with scope '%s' (%s)",
                command_set.scope,
                command_set.language_code,
            )
            await self.delete_bot_commands(
                command_set.scope,
                language_code=command_set.language_code,
            )

    async def submit_photo(
        self, id: str
    ) -> Tuple[Union[Message, None], Union[str, None]]:
        db_entry = col_submitted.find_one({"_id": ObjectId(id)})
        submission = None

        if db_entry is None:
            raise SubmissionUnavailableError()

        if db_entry["temp"]["uuid"] is None:
            try:
                submission = await self.get_messages(
                    db_entry["user"], db_entry["telegram"]["msg_id"]
                )
                filepath = await self.download_media(
                    submission, file_name=self.config["locations"]["tmp"] + sep
                )
            except Exception as exp:
                raise SubmissionUnavailableError()

        elif not Path(
            f"{self.config['locations']['data']}/submissions/{db_entry['temp']['uuid']}/{db_entry['temp']['file']}",
        ).exists():
            raise SubmissionUnavailableError()
        else:
            filepath = Path(
                f"{self.config['locations']['data']}/submissions/{db_entry['temp']['uuid']}/{db_entry['temp']['file']}",
            )
            with contextlib.suppress(Exception):
                submission = await self.get_messages(
                    db_entry["user"], db_entry["telegram"]["msg_id"]
                )

        with open(str(filepath), "rb") as fh:
            photo_bytes = BytesIO(fh.read())

        try:
            response = await photo_upload(
                self.config["posting"]["api"]["album"],
                client=client,
                multipart_data=BodyPhotoUploadAlbumsAlbumPhotosPost(
                    File(photo_bytes, filepath.name, "image/jpeg")
                ),
                ignore_duplicates=self.config["submission"]["allow_duplicates"],
                compress=False,
                caption="queue",
            )
        except UnexpectedStatus:
            raise SubmissionUnsupportedError(str(filepath))

        response_dict = loads(response.content.decode("utf-8"))

        if "duplicates" in response_dict and len(response_dict["duplicates"]) > 0:
            duplicates = []
            for index, duplicate in enumerate(response_dict["duplicates"]):  # type: ignore
                if response_dict["access_token"] is None:
                    duplicates.append(
                        f"`{duplicate['id']}`:\n{self.config['posting']['api']['address_external']}/photos/{duplicate['id']}"
                    )
                else:
                    duplicates.append(
                        f"`{duplicate['id']}`:\n{self.config['posting']['api']['address_external']}/token/photo/{response_dict['access_token']}?id={index}"
                    )
            raise SubmissionDuplicatesError(str(filepath), duplicates)

        col_submitted.find_one_and_update(
            {"_id": ObjectId(id)}, {"$set": {"done": True}}
        )

        try:
            if db_entry["temp"]["uuid"] is not None:
                rmtree(
                    Path(
                        f"{self.config['locations']['data']}/submissions/{db_entry['temp']['uuid']}",
                    ),
                    ignore_errors=True,
                )
            else:
                remove(str(filepath))
        except (FileNotFoundError, NotADirectoryError):
            logger.error("Could not delete '%s' on submission accepted", filepath)

        return submission, response.parsed.id

    async def ban_user(self, id: int) -> None:
        pass

    async def unban_user(self, id: int) -> None:
        pass