import asyncio
import json
import logging
from copy import deepcopy
from sanic import Blueprint, response
from sanic.request import Request
from sanic.response import HTTPResponse
from aiogram import Bot
from aiogram.types import (
    InlineKeyboardButton,
    Update,
    InlineKeyboardMarkup,
    KeyboardButton,
    ReplyKeyboardMarkup,
    Message,
)
from aiogram.utils.exceptions import TelegramAPIError
from typing import Dict, Text, Any, List, Optional, Callable, Awaitable

from rasa.core.channels.channel import InputChannel, UserMessage, OutputChannel
from rasa.shared.constants import INTENT_MESSAGE_PREFIX
from rasa.shared.core.constants import USER_INTENT_RESTART
from rasa.shared.exceptions import RasaException

logger = logging.getLogger(__name__)


class TelegramOutput(Bot, OutputChannel):
    """Output channel for Telegram."""

    # skipcq: PYL-W0236
    @classmethod
    def name(cls) -> Text:
        return "telegram"

    def __init__(self, access_token: Optional[Text]) -> None:
        super().__init__(access_token)

    async def send_text_message(
        self, recipient_id: Text, text: Text, **kwargs: Any
    ) -> None:
        """Sends text message."""
        for message_part in text.strip().split("\n\n"):
            await self.send_message(recipient_id, message_part)

    async def send_image_url(
        self, recipient_id: Text, image: Text, **kwargs: Any
    ) -> None:
        """Sends an image."""
        await self.send_photo(recipient_id, image)

    async def send_text_with_buttons(
        self,
        recipient_id: Text,
        text: Text,
        buttons: List[Dict[Text, Any]],
        button_type: Optional[Text] = "inline",
        **kwargs: Any,
    ) -> None:
        """Sends a message with keyboard.

        For more information: https://core.telegram.org/bots#keyboards

        :button_type inline: horizontal inline keyboard

        :button_type vertical: vertical inline keyboard

        :button_type reply: reply keyboard
        """
        if button_type == "inline":
            reply_markup = InlineKeyboardMarkup()
            button_list = [
                InlineKeyboardButton(s["title"], callback_data=s["payload"])
                for s in buttons
            ]
            reply_markup.row(*button_list)

        elif button_type == "vertical":
            reply_markup = InlineKeyboardMarkup()
            [
                reply_markup.row(
                    InlineKeyboardButton(s["title"], callback_data=s["payload"])
                )
                for s in buttons
            ]

        elif button_type == "reply":
            reply_markup = ReplyKeyboardMarkup(
                resize_keyboard=False, one_time_keyboard=True
            )
            # drop button_type from button_list
            button_list = [b for b in buttons if b.get("title")]
            for idx, button in enumerate(buttons):
                if isinstance(button, list):
                    reply_markup.add(KeyboardButton(s["title"]) for s in button)
                else:
                    reply_markup.add(KeyboardButton(button["title"]))
        else:
            logger.error(
                "Trying to send text with buttons for unknown "
                "button type {}".format(button_type)
            )
            return

        await self.send_message(recipient_id, text, reply_markup=reply_markup)

    async def send_custom_json(
        self, recipient_id: Text, json_message: Dict[Text, Any], **kwargs: Any
    ) -> None:
        """Sends a message with a custom json payload."""
        json_message = deepcopy(json_message)

        recipient_id = json_message.pop("chat_id", recipient_id)

        send_functions = {
            ("text",): "send_message",
            ("photo",): "send_photo",
            ("audio",): "send_audio",
            ("document",): "send_document",
            ("sticker",): "send_sticker",
            ("video",): "send_video",
            ("video_note",): "send_video_note",
            ("animation",): "send_animation",
            ("voice",): "send_voice",
            ("media",): "send_media_group",
            ("latitude", "longitude", "title", "address"): "send_venue",
            ("latitude", "longitude"): "send_location",
            ("phone_number", "first_name"): "send_contact",
            ("game_short_name",): "send_game",
            ("action",): "send_chat_action",
            (
                "title",
                "decription",
                "payload",
                "provider_token",
                "start_parameter",
                "currency",
                "prices",
            ): "send_invoice",
        }

        for params in send_functions.keys():
            if all(json_message.get(p) is not None for p in params):
                args = [json_message.pop(p) for p in params]
                api_call = getattr(self, send_functions[params])
                await api_call(recipient_id, *args, **json_message)


class TelegramInput(InputChannel):
    """Telegram input channel"""

    @classmethod
    def name(cls) -> Text:
        return "telegram"

    @classmethod
    def from_credentials(cls, credentials: Optional[Dict[Text, Any]]) -> InputChannel:
        if not credentials:
            cls.raise_missing_credentials_exception()

        return cls(
            credentials.get("access_token"),
            credentials.get("verify"),
            credentials.get("webhook_url"),
        )

    def __init__(
        self,
        access_token: Optional[Text],
        verify: Optional[Text],
        webhook_url: Optional[Text],
        debug_mode: bool = True,
    ) -> None:
        self.access_token = access_token
        self.verify = verify
        self.webhook_url = webhook_url
        self.debug_mode = debug_mode

    @staticmethod
    def _is_location(message: Message) -> bool:
        return message.location is not None

    @staticmethod
    def _is_user_message(message: Message) -> bool:
        return message.text is not None

    @staticmethod
    def _is_edited_message(message: Update) -> bool:
        return message.edited_message is not None

    @staticmethod
    def _is_button(message: Update) -> bool:
        return message.callback_query is not None

    def blueprint(
        self, on_new_message: Callable[[UserMessage], Awaitable[Any]]
    ) -> Blueprint:
        telegram_webhook = Blueprint("telegram_webhook", __name__)
        out_channel = self.get_output_channel()

        @telegram_webhook.route("/", methods=["GET"])
        async def health(_: Request) -> HTTPResponse:
            return response.json({"status": "ok"})

        @telegram_webhook.route("/set_webhook", methods=["GET", "POST"])
        async def set_webhook(_: Request) -> HTTPResponse:
            s = await out_channel.set_webhook(self.webhook_url)
            if s:
                logger.info("Webhook Setup Successful")
                return response.text("Webhook setup successful")
            else:
                logger.warning("Webhook Setup Failed")
                return response.text("Invalid webhook")

        @telegram_webhook.route("/webhook", methods=["GET", "POST"])
        async def message(request: Request) -> Any:
            if request.method == "POST":

                request_dict = request.json
                if isinstance(request_dict, Text):
                    request_dict = json.loads(request_dict)
                update = Update(**request_dict)
                credentials = await out_channel.get_me()
                if not credentials.username == self.verify:
                    logger.debug("Invalid access token, check it matches Telegram")
                    return response.text("failed")

                if self._is_button(update):
                    msg = update.callback_query.message
                    text = update.callback_query.data
                elif self._is_edited_message(update):
                    msg = update.edited_message
                    text = update.edited_message.text
                else:
                    msg = update.message
                    if self._is_user_message(msg):
                        text = msg.text.replace("/bot", "")
                    elif self._is_location(msg):
                        text = '{{"lng":{0}, "lat":{1}}}'.format(
                            msg.location.longitude, msg.location.latitude
                        )
                    else:
                        return response.text("success")
                sender_id = msg.chat.id
                metadata = self.get_metadata(request)
                try:
                    if text == (INTENT_MESSAGE_PREFIX + USER_INTENT_RESTART):
                        await on_new_message(
                            UserMessage(
                                text,
                                out_channel,
                                sender_id,
                                input_channel=self.name(),
                                metadata=metadata,
                            )
                        )
                        await on_new_message(
                            UserMessage(
                                "/start",
                                out_channel,
                                sender_id,
                                input_channel=self.name(),
                                metadata=metadata,
                            )
                        )
                    else:
                        await on_new_message(
                            UserMessage(
                                text,
                                out_channel,
                                sender_id,
                                input_channel=self.name(),
                                metadata=metadata,
                            )
                        )
                except Exception as e:
                    logger.error(f"Exception when trying to handle message.{e}")
                    logger.debug(e, exc_info=True)
                    if self.debug_mode:
                        raise
                    pass

                return response.text("success")

        return telegram_webhook

    def get_output_channel(self) -> TelegramOutput:
        """Loads the telegram channel."""
        channel = TelegramOutput(self.access_token)

        try:
            asyncio.run(channel.set_webhook(url=self.webhook_url))
        except TelegramAPIError as error:
            raise RasaException(
                "Failed to set channel webhook: " + str(error)
            ) from error

        return channel