from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from fastapi import HTTPException, status, Depends, Request
from sqlalchemy.orm import Session

from apps.webui.models.users import Users

from pydantic import BaseModel
from typing import Union, Optional
from constants import ERROR_MESSAGES
from passlib.context import CryptContext
from datetime import datetime, timedelta
import requests
import jwt
import uuid
import logging
import config

logging.getLogger("passlib").setLevel(logging.ERROR)


SESSION_SECRET = config.WEBUI_SECRET_KEY
ALGORITHM = "HS256"

##############
# Auth Utils
##############

bearer_security = HTTPBearer(auto_error=False)
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def verify_password(plain_password, hashed_password):
    return (
        pwd_context.verify(plain_password, hashed_password) if hashed_password else None
    )


def get_password_hash(password):
    return pwd_context.hash(password)


def create_token(data: dict, expires_delta: Union[timedelta, None] = None) -> str:
    payload = data.copy()

    if expires_delta:
        expire = datetime.utcnow() + expires_delta
        payload.update({"exp": expire})

    encoded_jwt = jwt.encode(payload, SESSION_SECRET, algorithm=ALGORITHM)
    return encoded_jwt


def decode_token(token: str) -> Optional[dict]:
    try:
        decoded = jwt.decode(token, SESSION_SECRET, algorithms=[ALGORITHM])
        return decoded
    except Exception as e:
        return None


def extract_token_from_auth_header(auth_header: str):
    return auth_header[len("Bearer ") :]


def create_api_key():
    key = str(uuid.uuid4()).replace("-", "")
    return f"sk-{key}"


def get_http_authorization_cred(auth_header: str):
    try:
        scheme, credentials = auth_header.split(" ")
        return HTTPAuthorizationCredentials(scheme=scheme, credentials=credentials)
    except:
        raise ValueError(ERROR_MESSAGES.INVALID_TOKEN)


def get_current_user(
    request: Request,
    auth_token: HTTPAuthorizationCredentials = Depends(bearer_security),
):
    token = None

    if auth_token is not None:
        token = auth_token.credentials

    if token is None and "token" in request.cookies:
        token = request.cookies.get("token")

    if token is None:
        raise HTTPException(status_code=403, detail="Not authenticated")

    # auth by api key
    if token.startswith("sk-"):
        return get_current_user_by_api_key(token)

    # auth by jwt token
    data = decode_token(token)
    if data != None and "id" in data:
        user = Users.get_user_by_id(data["id"])
        if user is None:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail=ERROR_MESSAGES.INVALID_TOKEN,
            )
        else:
            Users.update_user_last_active_by_id(user.id)
        return user
    else:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.UNAUTHORIZED,
        )


def get_current_user_by_api_key(db: Session, api_key: str):
    user = Users.get_user_by_api_key(db, api_key)

    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.INVALID_TOKEN,
        )
    else:
        Users.update_user_last_active_by_id(db, user.id)

    return user


def get_verified_user(user=Depends(get_current_user)):
    if user.role not in {"user", "admin"}:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )
    return user


def get_admin_user(user=Depends(get_current_user)):
    if user.role != "admin":
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )
    return user