import re
import os
import casbin
import requests
import pandas as pd

from typing import Optional
from fastapi import HTTPException, Header, Request

from Utils.Authentication.TokenUtil import decode_token
from Utils.UniqueCoder.TimeSerialNumUtils import create_time_serial_num


def get_user_info_from_token(token: str):
    user_info = decode_token(token).get("user_info")
    if not user_info:
        raise HTTPException(status_code=400, detail="Invalid Token")
    return user_info


def match_req_url(regex: str, request: Request):
    req_url = request.url.__str__()
    m = re.search(regex, req_url)
    if not m:
        raise HTTPException(status_code=400, detail="Invalid Request")
    return m


def get_rap_by_name(name):
    url = "http://test.fecribd.com/api/user/role/role_access_policy/view?name={}"
    url = url.format(name)
    res = requests.post(url=url)
    return res.json()


def rbac(request: Request, token: Optional[str] = Header(...)):

    user_info = get_user_info_from_token(token)

    sub = user_info.get("role")

    raps = get_rap_by_name(name=sub)

    req_url = request.url.__str__()

    for rap in raps:

        regex = rap.get("obj")
        m = re.search(regex, req_url)

        if m:
            df = pd.json_normalize(raps)
            policy_file = create_time_serial_num(prefix="policy", suffix="")
            df.to_csv(r".\Utils\AccessControl\{}.csv".format(policy_file), header=False, index=False)

            e = casbin.Enforcer(
                os.getcwd() + r"\Utils\AccessControl\model.conf",
                os.getcwd() + r"\Utils\AccessControl\{}.csv".format(policy_file)
            )

            os.remove(r".\Utils\AccessControl\{}.csv".format(policy_file))

            obj = rap.get("obj")
            act = rap.get("act")

            if not e.enforce(sub, obj, act):
                raise HTTPException(status_code=202, detail="No Access")

            return True

    raise HTTPException(status_code=400, detail="Invalid Request")