import json
import hashlib

import logging
from typing import Any, Dict, List, Optional

import requests

from pydantic import BaseSettings

from aiogram import Bot
from aiogram.dispatcher import Dispatcher
from aiogram.utils import executor

from aiogram.types import InlineQuery
from aiogram.types import InlineQueryResultArticle
from aiogram.types import InputTextMessageContent


# Constants
DDG_URL = 'https://duckduckgo.com/js/spice/currency'
COINAPI_URL = 'https://rest.coinapi.io/v1/exchangerate'
# ---

# Config from .env
class Settings(BaseSettings):
    debug: bool
    coinapi_key: str
    telegram_token: str

    class Config:
        env_file = '.env'
        env_file_encoding = 'utf-8'

settings = Settings()
# ---

# Logging
log = logging.getLogger('shirino')
handler = logging.StreamHandler()
fmt = logging.Formatter('%(asctime)s %(levelname)s %(message)s')

handler.setFormatter(fmt)
log.addHandler(handler)

if settings.debug:
    handler.setLevel(logging.DEBUG)
    log.setLevel(logging.DEBUG)
# ---

bot = Bot(token=settings.telegram_token)
dp = Dispatcher(bot)


class CurrencyConverter:
    
    def __init__(self) -> None:
        
        self.amount = 1.0
        self.conv_amount = 0.0
        self.from_currency = ''
        self.conv_currency = ''
    
    def convert(self) -> None:
        """Currency conversion"""

        if not self.ddgapi():
            self.coinapi()
    
    def ddgapi(self) -> bool:
        """Get data from DuckDuckGo's currency API
        
        Returns:
            `False` if the currency does not exist,
            `True` on successful conversion
        """

        # API request
        resp = requests.get(
            f'{DDG_URL}/{self.amount}/{self.from_currency}'
            f'/{self.conv_currency}'
        )

        log.debug(resp.text)

        # Parsing JSON data
        data: Dict[str, Any] = json.loads(
            resp.text \
                .replace('ddg_spice_currency(', '') \
                .replace(');', '')
        )

        log.debug(data)

        # If the currency does not exist
        descr = data.get('headers', {}).get('description', '')
        if descr.find('ERROR') != -1:
            return False

        # Otherwise
        conv: Dict[str, str] = data.get('conversion', {})
        self.conv_amount = float(conv.get('converted-amount', 0))

        log.debug(conv)

        return True
    
    def coinapi(self) -> None:
        """Get data from CoinAPI (for cryptocurrencies)"""

        resp = requests.get(
            (
                f'{COINAPI_URL}/{self.from_currency}'
                f'/{self.conv_currency}'
            ),
            headers={
                'X-CoinAPI-Key': settings.coinapi_key,
            },
        )

        data: Dict[str, Any] = resp.json()
        self.conv_amount = float(data.get('rate', 0))


@dp.inline_handler()
async def currency(inline_query: InlineQuery) -> None:

    query = inline_query.query
    article: List[Optional[InlineQueryResultArticle]] = [None]

    text = query.split()
    len_ = len(text)

    result_id = hashlib.md5(query.encode()).hexdigest()
    conv = CurrencyConverter()

    try:
        if len_ == 3:
            conv.amount = float(text[0])
            conv.from_currency = text[1].upper()
            conv.conv_currency = text[2].upper()
            conv.convert()
        elif len_ == 2:
            conv.from_currency = text[0].upper()
            conv.conv_currency = text[1].upper()
            conv.convert()
        else:
            raise ValueError('Надо 2 или 3 аргумента')

        result = (
            f'{conv.amount} {conv.from_currency} = '
            f'{conv.conv_amount} {conv.conv_currency}'
        )

    except Exception as ex:
        result = f'{type(ex)}: {ex}'

    article[0] = InlineQueryResultArticle(
        id=result_id,
        title=result,
        input_message_content=InputTextMessageContent(
            message_text=result,
        ),
    )

    await inline_query.answer(
        article,
        cache_time=1,
        is_personal=True,
    )


executor.start_polling(dp, skip_updates=True)