from __future__ import annotations

import os
import json
import asyncio
import aiohttp
import logging

from typing import (
    Any,
    ClassVar,
    Optional,
    TypeVar,
    Coroutine,
    NoReturn,
    Dict,
    Union,
    TYPE_CHECKING
)
from . import utils
from .utils import MISSING, RETRY_MAX
from .exception import (
    VaildateUIDError,
    UIDNotFounded,
    HTTPException,
    Forbidden,
    EnkaServerError
)

if TYPE_CHECKING:
    T = TypeVar('T')
    Response = Coroutine[Any, Any, T]
    from .types.enkanetwork import EnkaNetwork as EnkaNetworkPayload

class Route:

    BASE_URL: ClassVar[str] = "https://enka.network{PATH}"
    RAW_DATA_URL = "https://raw.githubusercontent.com/mrwan200/enkanetwork.py-data/{PATH}"

    def __init__(
            self,
            method: str,
            path: str,
            endpoint: str = 'enka',
            uid: Optional[str] = None,
    ):
        self.method = method
        self.uid = uid
        self.url = ''
        if endpoint == 'enka':
            self.url: str = self.BASE_URL.format(PATH=path)
        else:
            self.url: str = self.RAW_DATA_URL.format(PATH=path)

class HTTPClient:

    LOGGER = logging.getLogger(__name__)

    def __init__(self, *, key: str = '', agent: str = '') -> None:
        self.__session: aiohttp.ClientSession = MISSING
        self.__headers: Dict = {}
        self.__agent = agent
        self.__key = key

    async def close(self) -> None:
        if self.__session is not MISSING:
            await self.__session.close()
            self.__session = MISSING
            self.LOGGER.debug('Session closed')
        else:
            self.LOGGER.debug('Session already closed')

    async def request(self, route: Route, **kwargs: Any) -> Any:
        method = route.method
        url = route.url
        uid = route.uid

        self.__headers.clear()
        if self.__agent != '':
            self.__headers['User-Agent'] = self.__agent

        kwargs['headers'] = {**utils.get_default_header(), **self.__headers}

        response: Optional[aiohttp.ClientResponse] = None
        data: Optional[Union[Dict[str, Any]]] = None

        if self.__session is MISSING:
            self.__session = aiohttp.ClientSession()

        for tries in range(RETRY_MAX):
            try:
                async with self.__session.request(method, url, **kwargs) as response:
                    if 300 > response.status >= 200:
                        data = await utils.to_data(response)

                        if not data['content'] or response.status != 200:
                            raise UIDNotFounded(f"UID {uid} not found.")

                        self.LOGGER.debug('%s %s has received %s', method, url, data)
                        return data

                    # we are being rate limited
                    # if response.status == 429:
                    # Banned by Cloudflare more than likely.

                    if response.status >= 400:
                        self.LOGGER.warning(f"Failure to fetch {url} ({response.status}) Retry {tries} / {RETRY_MAX}")
                        if tries > RETRY_MAX:
                            raise HTTPException(f"Failed to download {url}")
                        await asyncio.sleep(1 + tries * 2)  # 1 + tries * 2
                        continue

                    if response.status == 403:
                        raise Forbidden("Forbidden 403")  # TODO: คิดไม่ออกจะพิมพ์อะไร
                    elif response.status >= 500:
                        raise EnkaServerError("Server error")
                    else:
                        raise HTTPException("Unknown error")

            except OSError as e:
                # Connection reset by peer
                if tries < 4 and e.errno in (54, 10054):
                    await asyncio.sleep(1 + tries * 2)
                    continue
                raise

        if response is not None:
            # We've run out of retries, raise.
            if response.status >= 500:
                raise EnkaServerError("Server error")

            raise HTTPException("Unknown error")

        raise RuntimeError('Unreachable code in HTTP handling')

    def fetch_user(self, uid: Union[str, int]) -> Response[EnkaNetworkPayload]:
        if not utils.validate_uid(str(uid)):
            raise VaildateUIDError("Validate UID failed. Please check your UID.")
        url = f'/u/{uid}/__data.json' + ("?key={key}" if self.__key else "")
        return self.request(Route('GET', url, 'enka', uid))

    async def update_asset(self, path: dict) -> NoReturn:

        self.LOGGER.debug("Downloading new content...")

        for folder in path:
            for filename in os.listdir(path[folder]):
                self.LOGGER.debug(f"Downloading {folder} file {filename}...")

                # get new assets
                url = f"master/exports/{folder}/{filename}"
                data = await self.request(Route('GET', url, 'assets'))

                self.LOGGER.debug(f"Writing {folder} file {filename}...")

                # dumps to json file
                with open(os.path.join(path[folder], filename), "w", encoding="utf-8") as f:
                    json.dump(data["content"], f, ensure_ascii=False, indent=4)