from http.client import HTTPException
from typing import Dict, Optional
import requests
from requests import Request
import structlog

from app.authentik.settings import AuthentikSettings
from .models import User

logging = structlog.get_logger()


class Authentik:

    def __init__(self, settings: AuthentikSettings):
        self.base = f"{settings.baseurl}api/v3/"
        self.token = settings.token
        self.headers = {"Authorization": f"Bearer {self.token}"}
        self.hook_endpoint = None
        self.property_mapping = None
        self.event_matcher_policy = None
        self.event_transport = None
        self.admin_group = None
        self.event_rule = None
        self.event_rule_link = None

        # check connection
        r = requests.get(
            url=f"{self.base}/admin/version", headers=self.headers)
        assert r.status_code == 200

    def get(self, endpoint: str, params: Dict = {}) -> Request:
        return requests.get(url=f"{self.base}{endpoint}", params=params, headers=self.headers)

    def post(self, endpoint: str, data: Dict = {}) -> Request:
        return requests.post(url=f"{self.base}{endpoint}", json=data, headers=self.headers)

    def delete(self, endpoint: str) -> Request:
        return requests.delete(url=f"{self.base}{endpoint}", headers=self.headers)

    def create_web_hook(self, hook_endpoint):
        self.hook_endpoint = hook_endpoint
        self.event_matcher_policy = self.create_event_matcher_policy()
        self.property_mapping = self.create_property_mapping()
        self.event_transport = self.create_event_transport(
            self.hook_endpoint, self.property_mapping["pk"])
        self.admin_group = self.get_admin_group()
        self.event_rule = self.create_event_rule(
            self.admin_group, self.event_transport["pk"])
        self.event_rule_link = self.add_event_rule_link(
            self.event_matcher_policy["pk"], self.event_rule["pk"])
        return self

    def create_event_transport(self, hook_endpoint, property_mapping_pk):
        url = "events/transports/"
        data = {
            "mode": "webhook",
            "name": "my hook",
            "send_once": False,
            "webhook_mapping": property_mapping_pk,
            "webhook_url": hook_endpoint
        }

        for result in self.get(url).json()["results"]:
            if result["name"] == "my hook":
                raise Exception("Event Rule already exists")

        r: Request = self.post(url, data)
        if r.status_code == 201:
            return r.json()
        raise Exception(r.status_code, r.url, r.text)

    def create_event_rule(self, admin_group, event_transport):
        url = "events/rules/"
        data = {
            "group": admin_group["pk"],
            "name": "event-rule",
            "severity": "notice",
            "transports": [
                event_transport
            ]
        }

        for result in self.get(url).json()["results"]:
            if result["name"] == "event-rule":
                raise Exception("Event Rule already exists")

        r = self.post(url, data)
        if r.status_code == 201:
            return r.json()
        raise Exception(r.status_code, r.url, r.text)

    def add_event_rule_link(self, policy_pk, target_pk):
        url = "policies/bindings/"
        data = {
            "enabled": True,
            "group": "",
            "negate": False,
            "order": "0",
            "policy": policy_pk,
            "target": target_pk,
            "timeout": "1",
            "user": ""
        }
        r = self.post(url, data)
        if r.status_code == 201:
            return r.json()
        raise Exception(r.status_code, r.url, r.text)

    def get_admin_group(self):
        url = "core/groups/"
        args = {
            "is_superuser": True,
            "name": "authentik Admins"
        }
        r = self.get(url, args)
        if r.status_code == 200:
            groups = r.json()["results"]
            if len(groups) == 1:
                self.admin_group = groups[0]
                return self.admin_group
        raise Exception(r.status_code, r.url, r.text)

    def create_event_matcher_policy(self):
        url = "policies/event_matcher/"
        data = {
            "action": "model_created",
            "app": "authentik.core",
            "client_ip": "",
            "execution_logging": True,
            "name": "model created"
        }
        r = self.post(url, data)
        if r.status_code == 201:
            self.event_matcher_policy = r.json()
            return r.json()
        raise Exception(r.status_code, r.url, r.text)

    def create_property_mapping(self):
        url = "propertymappings/notification/"
        data = {
            "name": "new-mapper",
            "expression": "fields = {}\nif notification:\n  if notification.event:\n    for k, v in notification.event.context.items():\n      fields[k] = v\nreturn fields"
        }
        r = self.post(url, data)
        if r.status_code == 201:
            return r.json()
        raise Exception(r.status_code, r.url, r.text)

    def get_user_by_pk(self, pk: str) -> Optional[User]:
        r = self.get(f"core/users/{pk}").json()
        if "pk" in r:
            return User(**r)
        raise Exception(r)

    def get_user(self, user: User) -> Optional[User]:
        if user.pk:
            r = self.get(f"core/users/{user.pk}").json()
        else:
            r = self.get(f"core/users/?search={user.username}").json()
            if len(r["results"]) == 0:
                return None
            if len(r["results"]) > 1:
                raise Exception("More than one user with that username", r)
            r = r["results"][0]

        if "pk" in r:
            print(r)
            return User(**r)
        raise Exception(r)

    def create_user(self, user: User) -> User:
        r = self.post("core/users/", user.dict()).json()
        if "pk" in r:
            return User(**r)
        raise Exception(r)

    def delete_user(self, user: User) -> bool:
        if user == None or user.pk == None:
            raise Exception("Not a valid user")

        r = self.delete(f"core/users/{user.pk}")
        if r.status_code == 204:
            return True
        r = r.json()
        if("detail" in r):
            if r["detail"] == "Not found.":
                return False