# Other library imports
import requests
import hashlib
import hmac
import time
import json

# Project imports
from settings import settings
import util


class Verify(util.Base):
    """
    Class to handle user verification.
    """

    def get_authentication_link(self, external_user_id):
        """
        Get an external authentication link for a user.
        """
        # /resources/sdkIntegrations/levels/{levelName}/websdkLink?ttlInSecs={lifetime}&externalUserId={externalUserId}&lang={locale}
        url = (
            f"{settings.Verify.Base}/resources/sdkIntegrations/levels/{settings.Verify.LevelName}"
            f"/websdkLink?ttlInSecs=36000&externalUserId={external_user_id}"
        )
        resp = self.sign_request(requests.Request("POST", url))
        s = requests.Session()
        response = s.send(resp)
        verification_url = response.json()["url"]
        return verification_url

    def get_applicant_status(self, applicant_id):
        """
        Get the status of an applicant.
        """
        # url = settings.Verify.Base + '/resources/applicants/' + applicant_id + '/requiredIdDocsStatus'
        url = f"{settings.Verify.Base}/resources/applicants/'{applicant_id}/requiredIdDocsStatus"
        resp = self.sign_request(requests.Request("GET", url))
        s = requests.Session()
        response = s.send(resp)
        return response

    def get_external_user_id_status(self, external_user_id):
        """
        Get the status of an applicant by the external user ID.
        """
        url = settings.Verify.Base + f"/resources/applicants/-;externalUserId={external_user_id}/one"
        resp = self.sign_request(requests.Request("GET", url))
        s = requests.Session()
        response = s.send(resp)
        return response

    def create_applicant(self, external_user_id, level_name):
        """
        Create an applicant.
        """
        body = {"externalUserId": external_user_id}
        params = {"levelName": level_name}
        headers = {"Content-Type": "application/json", "Content-Encoding": "utf-8"}
        resp = self.sign_request(
            requests.Request(
                "POST",
                f"{settings.Verify.Base}/resources/applicants?levelName={level_name}",
                params=params,
                data=json.dumps(body),
                headers=headers,
            )
        )
        s = requests.Session()
        response = s.send(resp)
        applicant_id = response.json()["id"]
        return applicant_id

    def get_access_token(self, external_user_id, level_name):
        """
        Get an access token for an external user ID.
        """
        params = {"userId": external_user_id, "ttlInSecs": "600", "levelName": level_name}
        headers = {"Content-Type": "application/json", "Content-Encoding": "utf-8"}
        resp = self.sign_request(
            requests.Request("POST", f"{settings.Verify.Base}/resources/accessTokens", params=params, headers=headers)
        )
        s = requests.Session()
        response = s.send(resp)
        token = response.json()["token"]

        return token

    def sign_request(self, request: requests.Request) -> requests.PreparedRequest:
        """
        Sign a request.
        """
        prepared_request = request.prepare()
        now = int(time.time())
        method = request.method.upper()
        path_url = prepared_request.path_url  # includes encoded query params
        # could be None so we use an empty **byte** string here
        body = b"" if prepared_request.body is None else prepared_request.body
        if type(body) == str:
            body = body.encode("utf-8")
        data_to_sign = str(now).encode("utf-8") + method.encode("utf-8") + path_url.encode("utf-8") + body
        # hmac needs bytes
        signature = hmac.new(settings.Verify.Key.encode("utf-8"), data_to_sign, digestmod=hashlib.sha256)
        prepared_request.headers["X-App-Token"] = settings.Verify.Token
        prepared_request.headers["X-App-Access-Ts"] = str(now)
        prepared_request.headers["X-App-Access-Sig"] = signature.hexdigest()
        return prepared_request