# -*- coding: utf-8 -*-

###########################
# CacheDB implementations #
###########################

# Imports
from tubot.db.abc import CacheDB
from tubot.db.types import CacheDBTypes, UserStates, User
from tubot.static.env import PN_CACHE
from pickle import loads, dumps
from aiofiles.ospath import isdir, isfile
from aiofiles.os import mkdir
from aiofiles import open
from asyncio import sleep


class PythonCache(CacheDB):
    """
    Native python implementation of Cache DataBase
    """

    CACHE_DIR = PN_CACHE()()
    _ctype = CacheDBTypes.PythonPKL
    users: dict
    dirs: dict

    def __init__(self) -> None:
        super().__init__()

    async def _init(self) -> bool:
        self.users = {}
        self.dirs = {}
        if await isfile(f"{self.CACHE_DIR}/user_cache.pkl"):
            try:
                await self._load_pkl()
            except Exception:
                return False
        return True

    async def _load_pkl(self) -> None:
        if not await isdir(self.CACHE_DIR):
            await mkdir(self.CACHE_DIR)
        async with open(f"{self.CACHE_DIR}/user_cache.pkl", "rb") as file:
            buffer = await file.read()
            pkl = loads(buffer)
            self.users = pkl

    async def _save_pkl(self) -> None:
        if not await isdir(self.CACHE_DIR):
            await mkdir(self.CACHE_DIR)
        async with open(f"{self.CACHE_DIR}/user_cache.pkl", "wb") as file:
            await file.write(dumps(self.users))

    async def __validate__(self) -> bool:
        return await self._init()

    # Users

    async def add_user(self, tg_id: int, name: str) -> None:
        if tg_id in tuple(self.users.keys()):
            raise ValueError("User already exists")
        user = User(tg_id, name)
        self.users[tg_id] = user.dict
        await self._save_pkl()

    async def user_state(self, tg_id: int) -> UserStates:
        if tg_id not in tuple(self.users.keys()):
            raise ValueError("User doesn't exists")
        user = self.users[tg_id]
        return user["state"]

    async def change_user_state(self, tg_id: int, status: UserStates) -> None:
        if tg_id not in tuple(self.users.keys()):
            raise ValueError("User doesn't exists")
        user = self.users[tg_id]
        user["state"] = status
        await self._save_pkl()

    async def auth_user(self, tg_id: int) -> None:
        if tg_id not in tuple(self.users.keys()):
            raise ValueError("User doesn't exists")
        user = self.users[tg_id]
        user["auth"] = True
        await self._save_pkl()

    async def is_user_auth(self, tg_id: int) -> bool:
        if tg_id not in tuple(self.users.keys()):
            raise ValueError("User doesn't exists")
        user = self.users[tg_id]
        return user["auth"]

    # Dirs

    async def cache_dirs(self, dirs: dict, expire: int) -> None:
        self.dirs = dirs
        await sleep(expire)
        self.dirs = {}

    @property
    async def get_dirs(self) -> dict:
        return self.dirs