from homeassistant.core import HomeAssistant
import aiohttp
import asyncio
import logging
import jwt

_LOGGER = logging.getLogger(__name__)

TOKEN_ENDPOINT = "/oauth/token"
USER_ENDPOINT = "/feapi/v2/user"
LOCK_ENDPOINT = "/feapi/v2/lock"
LOCK_OPEN_ENDPOINT = "/feapi/v2/lock/open"
PROTOCOL = "https"

class ReosApi:

    def __init__(self, host: str, user: str, password: str, client_id: str, client_secret: str, access_token: str, refresh_token: str) -> None:
        self.host = host
        self.user = user
        self._id = user
        self.password = password
        self.client_id = client_id
        self.client_secret = client_secret
        self._access_token = access_token
        self._refresh_token = refresh_token
        self._update_token_callback = None

    def set_update_token_callback(self, callback) -> None:
        self._update_token_callback = callback

    async def __call_update_token_callback(self) -> None:
        if self._update_token_callback:
            await self._update_token_callback(self._access_token, self._refresh_token)

    async def get_access_token(self) -> str:
        if self._access_token is not None and self.__is_token_valid(self._access_token):
            return self._access_token
        elif self._refresh_token is not None:
            access, refresh = await self.__get_access_and_refresh_token_by_refresh_token()
            await self.__store_tokens(access, refresh)
            return self._access_token
        else:
            access, refresh = await self.__get_access_and_refresh_token_by_password()
            await self.__store_tokens(access, refresh)
            return self._access_token

    async def __store_tokens(self, access, refresh):
        self._access_token = access
        self._refresh_token = refresh
        await self.__call_update_token_callback()

    async def __get_access_and_refresh_token_by_password(self) -> tuple[str, str]:
        async with aiohttp.ClientSession() as session, session.post(f"{PROTOCOL}://{self.host}{TOKEN_ENDPOINT}", json={
            "username": self.user,
            "password": self.password,
            "grant_type": "password",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "tss"
            }) as response:
                _json = await response.json()
                return _json["access_token"], _json["refresh_token"]

    async def __get_access_and_refresh_token_by_refresh_token(self) -> tuple[str, str]:
        async with aiohttp.ClientSession() as session, session.post(f"{PROTOCOL}://{self.host}{TOKEN_ENDPOINT}", json={
            "grant_type": "refresh_token",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "tss",
            "refresh_token": self._refresh_token
            }) as response:
                _json = await response.json()
                return _json["access_token"], _json["refresh_token"]

    async def open_lock(self, lock_id: int) -> None:
        async with await self.__get_session() as session:
            await session.post(f"{PROTOCOL}://{self.host}{LOCK_OPEN_ENDPOINT}", json={"lockId": lock_id})

    def __is_token_valid(self, token: str) -> bool:
        try:
            jwt.decode(token, options={"verify_signature": False})
            return True
        except jwt.ExpiredSignatureError:
            return False

    async def __get_session(self) -> aiohttp.ClientSession:
        token = await self.get_access_token()
        return aiohttp.ClientSession(headers={"Authorization": f"Bearer {token}"})

    async def test_connection(self) -> bool:
        async with await self.__get_session() as session, session.get(f"{PROTOCOL}://{self.host}{USER_ENDPOINT}") as response:
            return response.status == 200

    async def get_locks(self) -> list["ReosLockModel"]:
        async with await self.__get_session() as session, session.get(f"{PROTOCOL}://{self.host}{LOCK_ENDPOINT}") as response:
            _json = await response.json()
            _api_locks = _json["data"]
            locks: list[ReosLockModel] = []
            for _api_lock in _api_locks:
                if str(_api_lock["type"]).lower() == "lock":
                    _attr = _api_lock["attributes"]
                    _lock = ReosLockModel(
                        _attr["id"],
                        _attr["title"],
                        _attr["display_title"],
                        _attr["is_favorite"],
                        self
                    )
                    locks.append(_lock)
            return locks


class ReosLockModel:
    def __init__(self, id: int, name: str, display: str, is_favorite: bool, api: ReosApi) -> None:
        self._id = id
        self.name = name
        self.display = display
        self._api = api
        self.is_favorite = is_favorite

    @property
    def lock_id(self) -> int:
        return self._id

    async def open(self) -> None:
        await self._api.open_lock(self.lock_id)