#!/usr/bin/env python

import asyncio
import logging
from dataclasses import dataclass
from http import HTTPStatus
from config import BOT_TOKEN, TELEGRAM_WEBHOOK_URL, HEALTHCHECK_URL, FEDI_LOGIN_CALLBACK_URL, BOT_DOMAIN, BOT_PORT, ENCRYPT_KEY
import uvicorn
from starlette.applications import Starlette
from starlette.requests import Request
from starlette.responses import PlainTextResponse, Response, JSONResponse
from starlette.routing import Route
from telegram import Update
from telegram.error import BadRequest
from telegram.ext import (
    Application,
    CallbackContext,
    ContextTypes,
    ExtBot,
    CallbackQueryHandler,
    CommandHandler,
    MessageHandler,
    filters,
    ConversationHandler,
    TypeHandler,
)
from callback import (
    callback_generate_fedi_login_url,
    callback_skip_media,
    callback_location_sharing,
    callback_manual_location,
    callback_location_confirmation,
    callback_location_keyword_search,
    callback_skip_location_keyword_search,
    callback_add_comment,
    callback_skip_comment,
    callback_add_media,
    callback_delayed_checkin
)
from command import (
    start_command,
    fedi_login_command,
    cancel_command,
    help_command,
    tos_command,
    toggle_visibility_command,
    callback_toggle_visibility,
    logout_command,
    list_command,
    delayed_checkin_command,
)
from config import (
    FEDI_LOGIN,
    WAIT_LOCATION,
    PROMPT_FEDI_LOGIN,
    LOCATION_SEARCH_KEYWORD,
    LOCATION_CONFIRMATION,
    ADD_MEDIA,
    ADD_COMMENT,
    BOT_TOKEN,
    BOT_SCOPE,
    MAIN_MENU,
    WAIT_VISIBILITY,
    DELAYED_CHECKIN,
)

from prompt.string import PROMPT_CHOOSE_ACTION
from mastodon import Mastodon
from dbstore.peewee_store import db, User, get_user_by_state
from util import encrypt, decrypt

logging.basicConfig(
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s", level=logging.INFO
)
logger = logging.getLogger(__name__)


@dataclass
class FediLoginCallbackUpdate:
    code: str
    state: str
    user_id: str


class FediLoginCallbackContext(CallbackContext[ExtBot, dict, dict, dict]):
    """
    Custom CallbackContext class that makes `user_data` available for updates of type
    `WebhookUpdate`.
    """
    @classmethod
    def from_update(cls, update: object, application: "Application") -> "FediLoginCallbackContext":
        if isinstance(update, FediLoginCallbackUpdate):
            return cls(application=application, user_id=int(update.user_id))
        return super().from_update(update, application)


async def process_oauth_login_callback(update: FediLoginCallbackUpdate, context: FediLoginCallbackContext) -> None:
    state = update.state

    with db.connection_context():
        user = User.get(User.state == state)

        client_id = user.client_id
        client_secret = user.client_secret
        home_instance = user.home_instance

        if len(user.access_key) == 0:
            mastodon_client = Mastodon(client_id=client_id, client_secret=client_secret,
                                       api_base_url=home_instance, version_check_mode="none")
            access_token = mastodon_client.log_in(
                code=update.code,
                redirect_uri="{}{}".format(BOT_DOMAIN, FEDI_LOGIN_CALLBACK_URL),
                scopes=BOT_SCOPE
            )
            instance_info = mastodon_client.instance_nodeinfo()
            if instance_info["software"]["name"] == "pleroma":
                user.home_instance_type = "pleroma"
            user.access_key = encrypt(access_token, ENCRYPT_KEY)
            user.save()

        text = "You have successfully logged in to your Mastodon account!"
        try:
            await context.bot.delete_message(chat_id=user.telegram_user_id, message_id=context.user_data[PROMPT_FEDI_LOGIN])
            await context.bot.send_message(chat_id=user.telegram_user_id, text=text)
            await context.bot.send_message(chat_id=user.telegram_user_id, text=PROMPT_CHOOSE_ACTION, reply_markup=MAIN_MENU)
        except BadRequest as e:
            if "not found" in str(e.message):
                pass


async def main() -> None:
    context_types = ContextTypes(context=FediLoginCallbackContext)
    application = (
        Application.builder().updater(None).token(BOT_TOKEN).context_types(context_types).build()
    )

    # TODO:
    # check user login status before invoking commands
    checkin_handler = ConversationHandler(
        entry_points=[
            CommandHandler("start", start_command),
            CommandHandler("login", fedi_login_command),
            MessageHandler(filters.LOCATION, callback_location_sharing),
        ],
        states={
            FEDI_LOGIN: [
                MessageHandler(filters.TEXT & ~filters.COMMAND, callback_generate_fedi_login_url),
            ],
            WAIT_LOCATION: [
                MessageHandler(filters.LOCATION, callback_location_sharing),
            ],
            LOCATION_SEARCH_KEYWORD: [
                MessageHandler(filters.TEXT & ~filters.COMMAND, callback_location_keyword_search),
                CallbackQueryHandler(callback_skip_location_keyword_search),
            ],
            LOCATION_CONFIRMATION: [
                CallbackQueryHandler(callback_location_confirmation),
                MessageHandler(filters.TEXT & ~filters.COMMAND, callback_manual_location)
            ],
            ADD_COMMENT: [
                MessageHandler(filters.TEXT & ~filters.COMMAND, callback_add_comment),
                CallbackQueryHandler(callback_skip_comment),
            ],
            ADD_MEDIA: [MessageHandler(filters.PHOTO, callback_add_media),
                        CallbackQueryHandler(callback_skip_media)],
        },
        fallbacks=[CommandHandler("cancel", cancel_command)],
        per_message=False,
        allow_reentry=True,
    )

    # register handlers
    application.add_handler(CommandHandler("tos", tos_command))
    visibility_conversation_handler = ConversationHandler(
        entry_points=[
            CommandHandler("vis", toggle_visibility_command)
        ],
        states={
            WAIT_VISIBILITY: [
                CallbackQueryHandler(callback_toggle_visibility)
        ]},
        fallbacks=[CommandHandler("cancel", cancel_command)],
        per_message=False,
        allow_reentry=True,
    )

    delayed_checkin_handler = ConversationHandler(
        entry_points=[
            CommandHandler("delay", delayed_checkin_command),
        ],
        states={
            DELAYED_CHECKIN: [
                MessageHandler(filters.TEXT & ~filters.COMMAND, callback_delayed_checkin),
            ],
        },
        fallbacks=[CommandHandler("cancel", cancel_command)],
        per_message=False,
        allow_reentry=True,
    )

    application.add_handler(CommandHandler("logout", logout_command))
    application.add_handler(CommandHandler("list", list_command))
    application.add_handler(CommandHandler("Help", help_command))
    application.add_handler(TypeHandler(type=FediLoginCallbackUpdate, callback=process_oauth_login_callback))

    application.add_handler(delayed_checkin_handler, 3)
    application.add_handler(visibility_conversation_handler, 2)
    application.add_handler(checkin_handler, 1)

    # Pass webhook settings to telegram
    await application.bot.set_webhook(url=f"{BOT_DOMAIN}{TELEGRAM_WEBHOOK_URL}")

    # Set up webserver
    async def telegram_webhook(request: Request) -> JSONResponse:
        """Handle incoming Telegram updates by putting them into the `update_queue`"""
        await application.update_queue.put(
            Update.de_json(data=await request.json(), bot=application.bot)
        )
        return JSONResponse({'OK': 200})

    async def fedi_oauth_login_callback(request: Request) -> PlainTextResponse:
        """
        Handle incoming webhook updates by also putting them into the `update_queue` if
        the required parameters were passed correctly.
        """
        try:
            code = request.query_params["code"]
            state = request.query_params.get("state")
            user = get_user_by_state(state)
        except KeyError:
            return PlainTextResponse(
                status_code=HTTPStatus.BAD_REQUEST,
                content="Mastodon callback request doesn't contain a valid OAuth code",
            )

        await application.update_queue.put(FediLoginCallbackUpdate(state=state, code=code,
                                                                   user_id=user["telegram_user_id"]))
        return PlainTextResponse("Thank you for login! Now you can close the browser")

    async def healthcheck(_: Request) -> PlainTextResponse:
        return PlainTextResponse(content="OK")

    starlette_app = Starlette(
        routes=[
            Route(TELEGRAM_WEBHOOK_URL, telegram_webhook, methods=["POST"]),
            Route(HEALTHCHECK_URL, healthcheck, methods=["GET"]),
            Route(FEDI_LOGIN_CALLBACK_URL, fedi_oauth_login_callback, methods=["GET"]),
        ]
    )
    webserver = uvicorn.Server(
        config=uvicorn.Config(
            app=starlette_app,
            port=BOT_PORT,
            use_colors=False,
            host="0.0.0.0",
        )
    )

    # Run application and webserver together
    async with application:
        await application.start()
        await webserver.serve()
        await application.stop()


if __name__ == "__main__":
    asyncio.run(main())