from typing import Annotated

from fastapi import Depends, Header
from fastapi.security import HTTPBearer
from jose import ExpiredSignatureError, JWTError, jwt

from app.config import settings
from app.exceptions import (
    IncorrectTokenFormatException,
    TokenExpiredException,
    TokenMissingException,
)
from app.services import user_service
from app.users.exceptions import UserMustConfirmEmailException, UserNotFoundException
from app.users.schemas import SUser
from app.utils.unit_of_work import UnitOfWork

auth_schema = HTTPBearer()


def get_token(token=Depends(auth_schema)) -> str:
	if not token:
		raise TokenMissingException
	return token.credentials


async def get_current_user(token: str = Depends(get_token), uow=Depends(UnitOfWork)) -> SUser:
	try:
		payload = jwt.decode(token, settings.JWT_SECRET_KEY, settings.JWT_ALGORITHM)
	except ExpiredSignatureError:
		raise TokenExpiredException
	except JWTError:
		raise IncorrectTokenFormatException

	user_id: str = payload.get("sub")
	if not user_id:
		raise UserNotFoundException

	user = await user_service.find_user(uow=uow, id=int(user_id))

	return user


async def get_verificated_user(user: SUser = Depends(get_current_user)) -> SUser:
	if user.role < settings.VERIFICATED_USER:
		raise UserMustConfirmEmailException
	return user


def get_token_ws(sec_websocket_protocol: Annotated[str | None, Header()] = None) -> str:
	if sec_websocket_protocol is None:
		raise TokenMissingException
	return sec_websocket_protocol.split()[-1]


async def get_current_user_ws(token: str = Depends(get_token_ws), uow=Depends(UnitOfWork)) -> SUser:
	try:
		payload = jwt.decode(token, settings.JWT_SECRET_KEY, settings.JWT_ALGORITHM)
	except ExpiredSignatureError:
		raise TokenExpiredException
	except JWTError:
		raise IncorrectTokenFormatException

	user_id: str = payload.get("sub")
	if not user_id:
		raise UserNotFoundException

	user = await user_service.find_user(uow=uow, id=int(user_id))

	return user


async def get_subprotocol_ws(sec_websocket_protocol: Annotated[str | None, Header()] = None) -> str:
	if sec_websocket_protocol is None:
		raise TokenMissingException
	return sec_websocket_protocol.split(",")[0]