import json, os, jwt
from hashlib import sha256
from fastapi import HTTPException, status, Request
from fastapi.security import HTTPBasicCredentials
from logger import log_write, logger
from datetime import datetime, timedelta




users = json.loads(str(os.getenv("USER_KEYS")).replace("\n", ""))
for key in users:
    if key == "master": continue
    password = key+users[key]+users["master"]
    users[key] = sha256(password.encode('UTF-8')).hexdigest()

JWT_SECRET = users["master"]
JWT_ALGORITHM = "HS256"
JWT_EXPIRATION_TIME_MINUTES = 30

def authenticate_user(credentials: HTTPBasicCredentials) -> bool:
    username = credentials.username
    password = credentials.password
    password = username+password+users["master"]
    password = sha256(password.encode('UTF-8')).hexdigest()

    if credentials.username not in users or password != users[credentials.username]:
        log_write(credentials.username, "Autenticacion usuario fallida", "")
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Basic"},
        )

    log_write(credentials.username, "Usuario autenticado", "")
    return True

def create_jwt_token(data):
    to_encode = {"data": data}
    expire = datetime.utcnow() + timedelta(minutes=JWT_EXPIRATION_TIME_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, JWT_SECRET, algorithm=JWT_ALGORITHM)
    return encoded_jwt



async def validate_token(request: Request):
    data = {}
    try:
        data = await request.json()
        token = data.pop("token")
        payload = jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGORITHM])
        data["token_data"] = payload["data"]
    except Exception as e: 
        logger.error(repr(e) + " - " + str(data))
        raise HTTPException(status_code=404, detail="Token inválido")    
    return data