import logging
from datetime import datetime, timezone
from datetime import timedelta
from typing import Optional, Annotated, List
from typing import Dict
from typing import Optional

from fastapi import HTTPException, Security
from fastapi import Request
from fastapi import status
from fastapi.openapi.models import OAuthFlows as OAuthFlowsModel
from fastapi.security.utils import get_authorization_scheme_param

import bcrypt
from fastapi import Depends
from fastapi.security import SecurityScopes, OAuth2PasswordBearer, OAuth2
from pydantic import ValidationError

from src.core.config import settings
from jose import jwt, JWTError

from src.core.log_conf import logger
from src.db.models.admin import Profile
from src.db.repository.admin import get_profile
from src.db.session import SessionLocal
from src.schema.admin import TokenData, ProfileModel

oauth2_scheme = OAuth2PasswordBearer(
    tokenUrl="/api/login/token",
    scopes={"me": "read", "admin": "read"},
)


class OAuth2PasswordBearerWithCookie(OAuth2):
    def __init__(
            self,
            tokenUrl: str,
            scheme_name: Optional[str] = None,
            scopes: Optional[Dict[str, str]] = None,
            auto_error: bool = True,
    ):
        if not scopes:
            scopes = {}
        flows = OAuthFlowsModel(password={"tokenUrl": tokenUrl, "scopes": scopes})
        super().__init__(flows=flows, scheme_name=scheme_name, auto_error=auto_error)

    async def __call__(self, request: Request) -> Optional[str]:
        authorization: str = request.cookies.get(
            "access_token"
        )  # changed to accept access token from httpOnly Cookie

        scheme, param = get_authorization_scheme_param(authorization)
        if not authorization or scheme.lower() != "bearer":
            if self.auto_error:
                raise HTTPException(
                    status_code=status.HTTP_401_UNAUTHORIZED,
                    detail="Not authenticated",
                    headers={"WWW-Authenticate": "Bearer"},
                )
            else:
                return None
        return param


def authenticate_user(username: str, password: str) -> Optional[Profile]:
    with SessionLocal() as db:
        user = get_profile(username=username, db=db)
    logger.info(user)
    if not user:
        return None
    if bcrypt.checkpw(password.encode(), user.password.encode()):
        print("User successful authenticated")
    else:
        logger.info("Authentication failed!")
    return user


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(
            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
        )
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(
        to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
    )
    return encoded_jwt


async def get_current_user(security_scopes: SecurityScopes, token: Annotated[str, Depends(oauth2_scheme)]):
    if security_scopes.scopes:
        authenticate_value = f'Bearer scope="{security_scopes.scope_str}"'
    else:
        authenticate_value = "Bearer"
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": authenticate_value},
    )
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        username: str = payload.get("sub")
        logger.info("username/email extracted is ", username)
        if username is None:
            raise credentials_exception
        scope: str = payload.get("scope", "")
        token_scopes: List[str] = scope.split(" ")
        token_data = TokenData(scopes=token_scopes, username=username)
    except (JWTError, ValidationError):
        raise credentials_exception
    with SessionLocal() as db:
        user = get_profile(username=token_data.username, db=db)
    if user is None:
        raise credentials_exception
    for scope in security_scopes.scopes:
        if scope not in token_scopes:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="not enough permissions",
                headers={"WWW-Authenticate": authenticate_value},
            )
    return user


async def get_current_active_user(
        current_user: Annotated[Profile, Security(get_current_user, scopes=["me"])],
) -> ProfileModel:
    if not current_user.enabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    user_model = ProfileModel(username=current_user.user_name, email=current_user.email,
                              first_name=current_user.first_name, last_name=current_user.last_name,
                              active=current_user.enabled)
    return user_model



def get_current_user_from_token(token: str = Depends(oauth2_scheme)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
    )
    try:
        payload = jwt.decode(
            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
        )
        username: str = payload.get("sub")
        logger.info("username/email extracted is ", username)
        if username is None:
            raise credentials_exception
    except JWTError:
        raise credentials_exception
    with SessionLocal() as db:
        user = get_profile(username=username, db=db)
    if user is None:
        raise credentials_exception
    return user